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- adding tex->image convertor (mimeTeX)
1: /****************************************************************************
2: *
3: * Copyright(c) 2002-2005, John Forkosh Associates, Inc. All rights reserved.
4: * --------------------------------------------------------------------------
5: * This file is part of mimeTeX, which is free software. You may redistribute
6: * and/or modify it under the terms of the GNU General Public License,
7: * version 2 or later, as published by the Free Software Foundation.
8: * MimeTeX is distributed in the hope that it will be useful, but
9: * WITHOUT ANY WARRANTY, not even the implied warranty of MERCHANTABILITY.
10: * See the GNU General Public License for specific details.
11: * By using mimeTeX, you warrant that you have read, understood and
12: * agreed to these terms and conditions, and that you possess the legal
13: * right and ability to enter into this agreement and to use mimeTeX
14: * in accordance with it.
15: * Your mimeTeX distribution should contain a copy of the GNU General
16: * Public License. If not, write to the Free Software Foundation, Inc.,
17: * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA,
18: * or point your browser to http://www.gnu.org/licenses/gpl.html
19: * --------------------------------------------------------------------------
20: *
21: * Purpose: o MimeTeX, licensed under the gpl, lets you easily embed
22: * LaTeX math in your html pages. It parses a LaTeX math
23: * expression and immediately emits the corresponding gif
24: * image, rather than the usual TeX dvi. And mimeTeX is an
25: * entirely separate little program that doesn't use TeX or
26: * its fonts in any way. It's just one cgi that you put in
27: * your site's cgi-bin/ directory, with no other dependencies.
28: * So mimeTeX is very easy to install. And it's equally easy
29: * to use. Just place an html <img> tag in your document
30: * wherever you want to see the corresponding LaTeX expression.
31: * For example,
32: * <img src="../cgi-bin/mimetex.cgi?\int_{-\infty}^xe^{-t^2}dt"
33: * alt="" border=0 align=middle>
34: * immediately generates the corresponding gif image on-the-fly,
35: * displaying the rendered expression wherever you put that
36: * <img> tag. MimeTeX doesn't need intermediate dvi-to-gif
37: * conversion, and it doesn't clutter up your filesystem with
38: * separate little gif files for each converted expression.
39: * There's also no inherent need to repeatedly write the
40: * cumbersome <img> tag illustrated above. You can write
41: * your own custom tags, or write a wrapper script around
42: * mimeTeX to simplify the necessary notation.
43: *
44: * Functions: ===================== Raster Functions ======================
45: * PART2 --- raster constructor functions ---
46: * new_raster(width,height,pixsz) allocation (and constructor)
47: * new_subraster(width,height,pixsz)allocation (and constructor)
48: * new_chardef() allocate chardef struct
49: * delete_raster(rp) deallocate raster (rp = raster ptr)
50: * delete_subraster(sp) deallocate subraster (sp=subraster ptr)
51: * delete_chardef(cp) deallocate chardef (cp = chardef ptr)
52: * --- primitive (sub)raster functions ---
53: * rastcpy(rp) allocate new copy of rp
54: * subrastcpy(sp) allocate new copy of sp
55: * rastrot(rp) new raster rotated right 90 degrees to rp
56: * rastput(target,source,top,left,isopaque) overlay src on trgt
57: * rastcompose(sp1,sp2,offset2,isalign,isfree) sp2 on top of sp1
58: * rastcat(sp1,sp2,isfree) concatanate sp1||sp2
59: * rastack(sp1,sp2,base,space,iscenter,isfree)stack sp2 atop sp1
60: * rastile(tiles,ntiles) create composite raster from tiles
61: * rastsquash(sp1,sp2,xmin,ymin) calc #squash pixels sp1||sp2
62: * --- raster "drawing" functions ---
63: * accent_subraster(accent,width,height) draw \hat\vec\etc
64: * arrow_subraster(width,height,drctn,isBig) left/right arrow
65: * uparrow_subraster(width,height,drctn,isBig) up/down arrow
66: * rule_raster(rp,top,left,width,height,type) draw rule in rp
67: * line_raster(rp,row0,col0,row1,col1,thickness) draw line in rp
68: * line_recurse(rp,row0,col0,row1,col1,thickness) recurse line
69: * circle_raster(rp,row0,col0,row1,col1,thickness,quads) ellipse
70: * circle_recurse(rp,row0,col0,row1,col1,thickness,theta0,theta1)
71: * bezier_raster(rp,r0,c0,r1,c1,rt,ct) draw bezier recursively
72: * border_raster(rp,ntop,nbot,isline,isfree)put border around rp
73: * --- raster (and chardef) output functions ---
74: * type_raster(rp,fp) emit ascii dump of rp on file ptr fp
75: * type_bytemap(bp,grayscale,width,height,fp) dump bytemap on fp
76: * xbitmap_raster(rp,fp) emit mime xbitmap of rp on fp
77: * cstruct_chardef(cp,fp,col1) emit C struct of cp on fp
78: * cstruct_raster(rp,fp,col1) emit C struct of rp on fp
79: * hex_bitmap(rp,fp,col1,isstr)emit hex dump of rp->pixmap on fp
80: * --- ancillary output functions ---
81: * emit_string(fp,col1,string,comment) emit string and C comment
82: * ====================== Font Functions =======================
83: * --- font lookup functions ---
84: * get_symdef(symbol) returns mathchardef for symbol
85: * get_chardef(symdef,size) returns chardef for symdef,size
86: * get_charsubraster(symdef,size) wrap subraster around chardef
87: * --- ancillary font functions ---
88: * get_baseline(gfdata) determine baseline (in our coords)
89: * get_delim(symbol,height,family) delim just larger than height
90: * make_delim(symbol,height) construct delim exactly height size
91: * ================= Tokenize/Parse Functions ==================
92: * texchar(expression,chartoken) retruns next char or \sequence
93: * texsubexpr(expr,subexpr,maxsubsz,left,right,isescape,isdelim)
94: * texscripts(expression,subscript,superscript,which)get scripts
95: * --- ancillary parse functions ---
96: * isbrace(expression,braces,isescape) check for leading brace
97: * preamble(expression,size,subexpr) parse preamble
98: * mimeprep(expression) preprocessor converts \left( to \(, etc.
99: * strchange(nfirst,from,to) change nfirst chars of from to to
100: * strreplace(string,from,to,nreplace) change from to to in str
101: * strtexchr(string,texchr) find texchr in string
102: * findbraces(expression,command) find opening { or closing }
103: * PART3 =========== Rasterize an Expression (recursively) ===========
104: * --- here's the primary entry point for all of mimeTeX ---
105: * rasterize(expression,size) parse and rasterize expression
106: * --- explicitly called handlers that rasterize... ---
107: * rastparen(subexpr,size,basesp) parenthesized subexpr
108: * rastlimits(expression,size,basesp) dispatch super/sub call
109: * rastscripts(expression,size,basesp) super/subscripted exprssn
110: * rastdispmath(expression,size,sp) scripts for displaymath
111: * --- table-driven handlers that rasterize... ---
112: * rastleft(expression,size,basesp,ildelim,arg2,arg3)\left\right
113: * rastflags(expression,size,basesp,flag,value,arg3) set flag
114: * rastspace(expression,size,basesp,width,isfill,isheight)\,\:\;
115: * rastnewline(expression,size,basesp,arg1,arg2,arg3) \\
116: * rastarrow(expression,size,basesp,width,height,drctn) \longarr
117: * rastuparrow(expression,size,basesp,width,height,drctn)up/down
118: * rastoverlay(expression,size,basesp,overlay,arg2,arg3) \not
119: * rastfrac(expression,size,basesp,isfrac,arg2,arg3) \frac \atop
120: * rastackrel(expression,size,basesp,base,arg2,arg3) \stackrel
121: * rastmathfunc(expression,size,basesp,base,arg2,arg3) \lim,\etc
122: * rastsqrt(expression,size,basesp,arg1,arg2,arg3) \sqrt
123: * rastaccent(expression,size,basesp,accent,isabove,isscript)
124: * rastfont(expression,size,basesp,font,arg2,arg3) \cal{},\scr{}
125: * rastbegin(expression,size,basesp,arg1,arg2,arg3) \begin{}
126: * rastarray(expression,size,basesp,arg1,arg2,arg3) \array
127: * rastpicture(expression,size,basesp,arg1,arg2,arg3) \picture
128: * rastline(expression,size,basesp,arg1,arg2,arg3) \line
129: * rastcircle(expression,size,basesp,arg1,arg2,arg3) \circle
130: * rastbezier(expression,size,basesp,arg1,arg2,arg3) \bezier
131: * rastraise(expression,size,basesp,arg1,arg2,arg3) \raisebox
132: * rastrotate(expression,size,basesp,arg1,arg2,arg3) \rotatebox
133: * rastfbox(expression,size,basesp,arg1,arg2,arg3) \fbox
134: * rastinput(expression,size,basesp,arg1,arg2,arg3) \input
135: * rastcounter(expression,size,basesp,arg1,arg2,arg3) \counter
136: * rastnoop(expression,size,basesp,arg1,arg2,arg3) flush \escape
137: * --- helper functions for handlers ---
138: * rastopenfile(filename,mode) opens filename[.tex] in mode
139: * rastreadfile(filename,tag,value) read between <tag>...</tag>
140: * rastwritefile(filename,tag,value,isstrict)write<tag>...</tag>
141: * timestamp( ) formats timestamp string (used by rastcounter)
142: * dtoa(d,npts) double to comma-separated ascii
143: * === Anti-alias completed raster (lowpass) or symbols (ss) ===
144: * aalowpass(rp,bytemap,grayscale) lowpass grayscale bytemap
145: * aapnm(rp,bytemap,grayscale) lowpass based on pnmalias.c
146: * aasupsamp(rp,aa,sf,grayscale) or by supersampling
147: * aacolormap(bytemap,nbytes,colors,colormap)make colors,colormap
148: * aaweights(width,height) builds "canonical" weight matrix
149: * aawtpixel(image,ipixel,weights,rotate) weight image at ipixel
150: * PART1 ========================== Driver ===========================
151: * main(argc,argv) parses math expression and emits mime xbitmap
152: * isstrstr(string,snippets,iscase) are any snippets in string?
153: * ismonth(month) is month current month ("jan"-"dec")?
154: * unescape_url(url,isescape), x2c(what) xlate %xx url-encoded
155: * logger(fp,msglevel,logvars) logs environment variables
156: * emitcache(cachefile) read cachefile and emit bytes to stdout
157: * md5str(instr) md5 hash library functions
158: * GetPixel(x,y) callback function for gifsave library
159: *
160: * Source: mimetex.c (needs mimetex.h and texfonts.h to compile,
161: * and also needs gifsave.c if compiled with -DAA or -DGIF)
162: *
163: * --------------------------------------------------------------------------
164: * Notes o See bottom of file for main() driver (and "friends"),
165: * and compile as
166: * cc -DAA mimetex.c gifsave.c -lm -o mimetex.cgi
167: * to produce an executable that emits gif images with
168: * anti-aliasing (see Notes below). You may also compile
169: * cc -DGIF mimetex.c gifsave.c -lm -o mimetex.cgi
170: * to produce an executable that emits gif images without
171: * anti-aliasing. Alternatively, compile mimeTeX as
172: * cc -DXBITMAP mimetex.c -lm -o mimetex.cgi
173: * to produce an executable that just emits mime xbitmaps.
174: * In either case you'll need mimetex.h and texfonts.h,
175: * and with -DAA or -DGIF you'll also need gifsave.c
176: * o For gif images, the gifsave.c library by Sverre H. Huseby
177: * <http://shh.thathost.com> slightly modified by me to allow
178: * (a)sending output to stdout and (b)specifying a transparent
179: * background color index, is included with mimeTeX,
180: * and it's documented in mimetex.html#gifsave .
181: * o Optional compile-line -D defined symbols are documented
182: * in mimetex.html#options . They include...
183: * -DAA
184: * Turns on gif anti-aliasing with default values
185: * (CENTERWT=32, ADJACENTWT=3, CORNERWT=1)
186: * for the following anti-aliasing parameters...
187: * -DCENTERWT=n
188: * -DADJACENTWT=j
189: * -DCORNERWT=k
190: * MimeTeX currently provides a lowpass filtering
191: * algorithm for anti-aliasing, which is applied to the
192: * existing set of bitmap fonts. This lowpass filter
193: * applies default weights
194: * 1 3 1
195: * 3 32 3
196: * 1 3 1
197: * to neighboring pixels. The defaults weights are
198: * CENTERWT=32, ADJACENTWT=3 and CORNERWT=1,
199: * which you can adjust to control anti-aliasing.
200: * Lower CENTERWT values will blur/spread out lines
201: * while higher values will tend to sharpen lines.
202: * Experimentation is recommended to determine
203: * what value works best for you.
204: * -DCACHEPATH=\"path/\"
205: * This option saves each rendered image to a file
206: * in directory path/ which mimeTeX reads rather than
207: * re-rendering the same image every time it's given
208: * the same LaTeX expression. Sometimes mimeTeX disables
209: * caching, e.g., expressions containing \input{ } are
210: * re-rendered since the contents of the inputted file
211: * may have changed. If compiled without -DCACHEPATH
212: * mimeTeX always re-renders expressions. This usually
213: * isn't too cpu intensive, but if you have unusually
214: * high hit rates then image caching may be helpful.
215: * The path/ is relative to mimetex.cgi, and must
216: * be writable by it. Files created under path/ are
217: * named filename.gif, where filename is the 32-character
218: * MD5 hash of the LaTeX expression.
219: * -DDISPLAYSIZE=n
220: * By default, operator limits like \int_a^b are rendered
221: * \textstyle at font sizes \normalsize and smaller,
222: * and rendered \displaystyle at font sizes \large and
223: * larger. This default corresponds to -DDISPLAYSIZE=3,
224: * which you can adjust; e.g., -DDISPLAYSIZE=0 always
225: * defaults to \displaystyle, and 99 (or any large number)
226: * always defaults to \textstyle. Note that explicit
227: * \textstyle, \displaystyle, \limits or \nolimits
228: * directives in an expression always override
229: * the DISPLAYSIZE default.
230: * -NORMALSIZE=n
231: * MimeTeX currently has six font sizes numbered 0-5,
232: * and always starts in NORMALSIZE whose default value
233: * is 2. Specify -DNORMALSIZE=3 on the compile line if
234: * you prefer mimeTeX to start in default size 3, etc.
235: * -DREFERER=\"domain\" -or-
236: * -DREFERER=\"domain1,domain2,etc\"
237: * Blocks mimeTeX requests from unauthorized domains that
238: * may be using your server's mimetex.cgi without permission.
239: * If REFERER is defined, mimeTeX checks for the environment
240: * variable HTTP_REFERER and, if it exists, performs a
241: * case-insensitive test to make sure it contains 'domain'
242: * as a substring. If given several 'domain's (second form)
243: * then HTTP_REFERER must contain either 'domain1' or
244: * 'domain2', etc, as a (case-insensitive) substring.
245: * If HTTP_REFERER fails to contain a substring matching
246: * any of these domain(s), mimeTeX emits an error message
247: * image corresponding to the expression specified by
248: * the invalid_referer_msg string defined in main().
249: * Note: if HTTP_REFERER is not an environment variable,
250: * mimeTeX correctly generates the requested expression
251: * (i.e., no referer error).
252: * -DWARNINGS=n -or-
253: * -DNOWARNINGS
254: * If an expression submitted to mimeTeX contains an
255: * unrecognzied escape sequence, e.g., "y=x+\abc+1", then
256: * mimeTeX generates a gif image containing an embedded
257: * warning in the form "y=x+[\abc?]+1". If you want these
258: * warnings suppressed, -DWARNINGS=0 or -DNOWARNINGS tells
259: * mimeTeX to ignore unrecognized symbols, and the rendered
260: * image is "y=x++1" instead.
261: * -DWHITE
262: * MimeTeX usually renders black symbols on a white
263: * background. This option renders white symbols on
264: * a black background instead.
265: * o See individual function entry points for further comments.
266: * o The font information in texfonts.h was produced by multiple
267: * runs of gfuntype, one run per struct (i.e., one run per font
268: * family at a particular size). See gfuntype.c, and also
269: * mimetex.html#fonts, for details.
270: * o mimetex.c contains library functions implementing a raster
271: * datatype, functions to manipulate rasterized .mf fonts
272: * (see gfuntype.c which rasterizes .mf fonts), functions
273: * to parse LaTeX expressions, etc. A complete list of
274: * mimetex.c functions is above. See their individual entry
275: * points below for further comments.
276: * All these functions eventually belong in several
277: * different modules, possibly along the lines suggested
278: * by the divisions above. But until the best decomposition
279: * becomes clear, it seems better to keep mimetex.c
280: * neatly together, avoiding a bad decomposition that
281: * becomes permanent by default.
282: * o The "main" reusable function is rasterize(),
283: * which takes a string like "f(x)=\int_{-\infty}^xe^{-t^2}dt"
284: * and returns a (sub)raster representing it as a bit or bytemap.
285: * Your application can do anything it likes with this pixel map.
286: * MimeTeX just outputs it, either as a mime xbitmap or as a gif.
287: * --------------------------------------------------------------------------
288: * Revision History:
289: * 09/18/02 J.Forkosh Installation.
290: * 12/11/02 J.Forkosh Version 1.00 released.
291: * 07/04/03 J.Forkosh Version 1.01 released.
292: * 10/17/03 J.Forkosh Version 1.20 released.
293: * 12/21/03 J.Forkosh Version 1.30 released.
294: * 02/01/04 J.Forkosh Version 1.40 released.
295: * 10/02/04 J.Forkosh Version 1.50 released.
296: * 11/30/04 J.Forkosh Version 1.60 released.
297: *
298: ****************************************************************************/
299:
300: /* -------------------------------------------------------------------------
301: header files and macros
302: -------------------------------------------------------------------------- */
303: /* --- standard headers --- */
304: #include <stdio.h>
305: #include <stdlib.h>
306: /*#include <unistd.h>*/
307: #include <string.h>
308: #include <ctype.h>
309: #include <math.h>
310: #include <time.h>
311:
312: /* --- windows-specific header info --- */
313: #ifndef WINDOWS /* -DWINDOWS not supplied by user */
314: #if defined(_WIN32) || defined(WIN32) \
315: || defined(DJGPP) /* try to recognize windows */
316: #define WINDOWS /* signal windows */
317: #endif
318: #endif
319: #ifdef WINDOWS /* Windows opens stdout in char mode, and */
320: #include <fcntl.h> /* precedes every 0x0A with spurious 0x0D.*/
321: #include <io.h> /* So emitcache() issues a Win _setmode() */
322: /* call to put stdout in binary mode. */
323: #if defined(_O_BINARY) && !defined(O_BINARY) /* only have _O_BINARY */
324: #define O_BINARY _O_BINARY /* make O_BINARY available, etc... */
325: #define setmode _setmode
326: #define fileno _fileno
327: #endif
328: #if defined(_O_BINARY) || defined(O_BINARY) /* setmode() now available */
329: #define HAVE_SETMODE /* so we'll use setmode() */
330: #endif
331: #define ISWINDOWS 1
332: #else
333: #define ISWINDOWS 0
334: #endif
335:
336: /* --- check for supersampling or low-pass anti-aliasing --- */
337: #ifdef SS
338: #define ISSUPERSAMPLING 1
339: #ifndef AAALGORITHM
340: #define AAALGORITHM 1 /* default supersampling algorithm */
341: #endif
342: #ifndef AA /* anti-aliasing not explicitly set */
343: #define AA /* so define it ourselves */
344: #endif
345: #ifndef SSFONTS /* need supersampling fonts */
346: #define SSFONTS
347: #endif
348: #else
349: #define ISSUPERSAMPLING 0
350: #ifndef AAALGORITHM
351: #define AAALGORITHM 2 /* default lowpass algorithm */
352: #endif
353: #endif
354:
355: /* --- set aa (and default gif) if any anti-aliasing options specified --- */
356: #if defined(AA) || defined(GIF) || defined(PNG) \
357: || defined(CENTERWT) || defined(ADJACENTWT) || defined(CORNERWT) \
358: || defined(MINADJACENT) || defined(MAXADJACENT)
359: #if !defined(GIF) && !defined(AA) /* aa not explicitly specified */
360: #define AA /* so define it ourselves */
361: #endif
362: #if !defined(GIF) && !defined(PNG) /* neither gif nor png specified */
363: #define GIF /* so default to gif */
364: #endif
365: #endif
366: /* --- resolve output option inconsistencies --- */
367: #if defined(XBITMAP) /* xbitmap supercedes gif and png */
368: #ifdef AA
369: #undef AA
370: #endif
371: #ifdef GIF
372: #undef GIF
373: #endif
374: #ifdef PNG
375: #undef PNG
376: #endif
377: #endif
378:
379: /* --- decide whether to compile main() --- */
380: #if defined(XBITMAP) || defined(GIF) || defined(PNG)
381: #define DRIVER /* driver will be compiled */
382: /* --- check whether or not to perform http_referer check --- */
383: #ifndef REFERER /* all http_referer's allowed */
384: #define REFERER NULL
385: #endif
386: /* --- max query_string length if no http_referer supplied --- */
387: #ifndef NOREFMAXLEN
388: #define NOREFMAXLEN 9999 /* default to any length query */
389: #endif
390: #else
391: #define NOTEXFONTS /* texfonts not required */
392: #endif
393:
394: /* --- application headers --- */
395: #if !defined(NOTEXFONTS) && !defined(TEXFONTS)
396: #define TEXFONTS /* to include texfonts.h */
397: #endif
398: #include "mimetex.h"
399:
400: /* -------------------------------------------------------------------------
401: adjustable default values
402: -------------------------------------------------------------------------- */
403: /* --- anti-aliasing parameters --- */
404: #ifndef CENTERWT
405: /*#define CENTERWT 10*/ /* anti-aliasing centerwt default */
406: /*#define CENTERWT 6*/ /* anti-aliasing centerwt default */
407: #define CENTERWT 32 /* anti-aliasing centerwt default */
408: #endif
409: #ifndef ADJACENTWT
410: /*#define ADJACENTWT 3*/ /* anti-aliasing adjacentwt default*/
411: /*#define ADJACENTWT 2*/ /* anti-aliasing adjacentwt default*/
412: #define ADJACENTWT 3 /* anti-aliasing adjacentwt default*/
413: #endif
414: #ifndef CORNERWT
415: #define CORNERWT 1 /* anti-aliasing cornerwt default*/
416: #endif
417: #ifndef MINADJACENT
418: #define MINADJACENT 6 /*anti-aliasing minadjacent default*/
419: #endif
420: #ifndef MAXADJACENT
421: #define MAXADJACENT 8 /*anti-aliasing maxadjacent default*/
422: #endif
423: /* --- variables for anti-aliasing parameters --- */
424: GLOBAL(int,centerwt,CENTERWT); /*lowpass matrix center pixel wt */
425: GLOBAL(int,adjacentwt,ADJACENTWT); /*lowpass matrix adjacent pixel wt*/
426: GLOBAL(int,cornerwt,CORNERWT); /*lowpass matrix corner pixel wt */
427: GLOBAL(int,minadjacent,MINADJACENT); /* darken if>=adjacent pts black*/
428: GLOBAL(int,maxadjacent,MAXADJACENT); /* darken if<=adjacent pts black */
429: GLOBAL(int,weightnum,1); /* font wt, */
430: GLOBAL(int,maxaaparams,4); /* #entries in table */
431: /* --- parameter values by font weight --- */
432: #define aaparameters struct aaparameters_struct /* typedef */
433: aaparameters
434: { int centerwt; /* lowpass matrix center pixel wt*/
435: int adjacentwt; /* lowpass matrix adjacent pixel wt*/
436: int cornerwt; /* lowpass matrix corner pixel wt*/
437: int minadjacent; /* darken if >= adjacent pts black */
438: int maxadjacent; /* darken if <= adjacent pts black */
439: int fgalias,fgonly,bgalias,bgonly; } ; /* aapnm() params */
440: STATIC aaparameters aaparams[] /* set params by weight */
441: #ifdef INITVALS
442: =
443: { /* ----------------------------------------------------
444: centerwt adj corner minadj max fgalias,only,bgalias,only
445: ------------------------------------------------------- */
446: { 64, 1, 1, 6, 8, 1,0,0,0 }, /* 0 = light */
447: { CENTERWT,ADJACENTWT,CORNERWT,MINADJACENT,MAXADJACENT,1,0,0,0 },
448: { 8, 1, 1, 5, 8, 1,0,0,0 }, /* 2 = semibold */
449: { 8, 2, 1, 4, 9, 1,0,0,0 } /* 3 = bold */
450: } /* --- end-of-aaparams[] --- */
451: #endif
452: ;
453:
454: /* -------------------------------------------------------------------------
455: other variables
456: -------------------------------------------------------------------------- */
457: /* --- black on white background (default), or white on black --- */
458: #ifdef WHITE
459: #define ISBLACKONWHITE 0 /* white on black background */
460: #else
461: #define ISBLACKONWHITE 1 /* black on white background */
462: #endif
463: /* --- colors --- */
464: #define BGRED (ISBLACKONWHITE?255:0)
465: #define BGGREEN (ISBLACKONWHITE?255:0)
466: #define BGBLUE (ISBLACKONWHITE?255:0)
467: #ifndef FGRED
468: #define FGRED (ISBLACKONWHITE?0:255)
469: #endif
470: #ifndef FGGREEN
471: #define FGGREEN (ISBLACKONWHITE?0:255)
472: #endif
473: #ifndef FGBLUE
474: #define FGBLUE (ISBLACKONWHITE?0:255)
475: #endif
476: /* --- "squash" margin (0 means no squashing) --- */
477: #ifndef SQUASHMARGIN
478: #ifdef NOSQUASH
479: #define SQUASHMARGIN 0
480: #else
481: #define SQUASHMARGIN 3
482: #endif
483: #endif
484: /* --- textwidth --- */
485: #ifndef TEXTWIDTH
486: #define TEXTWIDTH (400)
487: #endif
488: /* --- font "combinations" --- */
489: #define CMSYEX (107) /* select CMSY10 _or_ CMEX10 */
490: /* --- prefix prepended to all expressions --- */
491: #ifndef PREFIX
492: #define PREFIX "\000" /* default no prepended prefix */
493: #endif
494: /* --- skip argv[]'s preceding ARGSIGNAL when parsing command-line args --- */
495: #ifdef NOARGSIGNAL
496: #define ARGSIGNAL NULL
497: #endif
498: #ifndef ARGSIGNAL
499: #define ARGSIGNAL "++"
500: #endif
501: /* --- security and logging (inhibit message logging, etc) --- */
502: #ifndef SECURITY
503: #define SECURITY 999 /* default highest security level */
504: #endif
505: #ifndef LOGFILE
506: #define LOGFILE "mimetex.log" /* default log file */
507: #endif
508: #ifndef CACHELOG
509: #define CACHELOG "mimetex.log" /* default caching log file */
510: #endif
511: #if !defined(NODUMPENVP) && !defined(DUMPENVP)
512: #define DUMPENVP /* assume char *envp[] available */
513: #endif
514: /* --- image caching (cache images if given -DCACHEPATH=\"path\") --- */
515: #ifndef CACHEPATH
516: #define ISCACHING 0 /* no caching */
517: #define CACHEPATH "\000" /* same directory as mimetex.cgi */
518: #else
519: #define ISCACHING 1 /* caching if -DCACHEPATH="path" */
520: #endif
521: /* --- \input paths (prepend prefix if given -DPATHPREFIX=\"prefix\") --- */
522: #ifndef PATHPREFIX
523: #define PATHPREFIX "\000" /* paths relative mimetex.cgi */
524: #endif
525:
526: /* -------------------------------------------------------------------------
527: debugging and logging / error reporting
528: -------------------------------------------------------------------------- */
529: /* --- debugging and error reporting --- */
530: #ifndef MSGLEVEL
531: #define MSGLEVEL 1
532: #endif
533: #define DBGLEVEL 9 /* debugging if msglevel>=DBGLEVEL */
534: #define LOGLEVEL 3 /* logging if msglevel>=LOGLEVEL */
535: #ifndef FORMLEVEL
536: #define FORMLEVEL LOGLEVEL /*msglevel if called from html form*/
537: #endif
538: GLOBAL(int,seclevel,SECURITY); /* security level */
539: GLOBAL(int,msglevel,MSGLEVEL); /* message level for verbose/debug */
540: STATIC FILE *msgfp; /* output in command-line mode */
541: /* --- embed warnings in rendered expressions, [\xxx?] if \xxx unknown --- */
542: #ifdef WARNINGS
543: #define WARNINGLEVEL WARNINGS
544: #else
545: #ifdef NOWARNINGS
546: #define WARNINGLEVEL 0
547: #else
548: #define WARNINGLEVEL 1
549: #endif
550: #endif
551: GLOBAL(int,warninglevel,WARNINGLEVEL); /* warning level */
552:
553: /* -------------------------------------------------------------------------
554: control flags and values
555: -------------------------------------------------------------------------- */
556: GLOBAL(int,recurlevel,0); /* inc/decremented in rasterize() */
557: GLOBAL(int,scriptlevel,0); /* inc/decremented in rastlimits() */
558: GLOBAL(int,istext,0); /* textmode if true,italics=2,bb=3 */
559: GLOBAL(int,isstring ,0); /*pixmap is ascii string, not raster*/
560: GLOBAL(int,isdisplaystyle,1); /* displaystyle mode (forced if 2) */
561: GLOBAL(int,ispreambledollars,0); /* displaystyle mode set by $$...$$ */
562: GLOBAL(int,fontsize,NORMALSIZE); /* current size */
563: GLOBAL(int,displaysize,DISPLAYSIZE); /* use \displaystyle when fontsize>=*/
564: GLOBAL(int,shrinkfactor,3); /* shrinkfactors[fontsize] */
565: GLOBAL(double,unitlength,1.0); /* #pixels per unit (may be <1.0) */
566: /*GLOBAL(int,textwidth,TEXTWIDTH);*/ /* #pixels across line */
567: GLOBAL(int,squashmargin,SQUASHMARGIN); /* minimum "squash" margin */
568: GLOBAL(int,issquashdelta,1); /* true if squashmargin is a delta */
569: GLOBAL(int,istransparent,1); /*true to set background transparent*/
570: GLOBAL(int,fgred,FGRED);
571: GLOBAL(int,fggreen,FGGREEN);
572: GLOBAL(int,fgblue,FGBLUE); /* fg r,g,b */
573: GLOBAL(int,bgred,BGRED);
574: GLOBAL(int,bggreen,BGGREEN);
575: GLOBAL(int,bgblue,BGBLUE); /* bg r,g,b */
576: GLOBAL(int,isblackonwhite,ISBLACKONWHITE); /*1=black on white,0=reverse*/
577: GLOBAL(char,exprprefix[256],PREFIX); /* prefix prepended to expressions */
578: GLOBAL(int,aaalgorithm,AAALGORITHM); /* for lp, 1=aalowpass, 2 =aapnm */
579: GLOBAL(int,fgalias,1);
580: GLOBAL(int,fgonly,0);
581: GLOBAL(int,bgalias,0);
582: GLOBAL(int,bgonly,0); /* aapnm() params */
583: GLOBAL(int,issupersampling,ISSUPERSAMPLING); /*1=supersampling 0=lowpass*/
584: GLOBAL(int,isss,ISSUPERSAMPLING); /* supersampling flag for main() */
585: GLOBAL(int,*workingparam,(int *)NULL); /* working parameter */
586: GLOBAL(subraster,*workingbox,(subraster *)NULL); /*working subraster box*/
587: GLOBAL(int,isreplaceleft,0); /* true to replace leftexpression */
588: GLOBAL(subraster,*leftexpression,(subraster *)NULL); /*rasterized so far*/
589: GLOBAL(mathchardef,*leftsymdef,NULL); /* mathchardef for preceding symbol*/
590: GLOBAL(int,iscaching,ISCACHING); /* true if caching images */
591: GLOBAL(char,cachepath[256],CACHEPATH); /* relative path to cached files */
592: GLOBAL(char,pathprefix[256],PATHPREFIX); /*prefix for \input,\counter paths*/
593: /*GLOBAL(int,iswindows,ISWINDOWS);*/ /* true if compiled for ms windows */
594:
595: /* -------------------------------------------------------------------------
596: miscellaneous macros
597: -------------------------------------------------------------------------- */
598: #define max2(x,y) ((x)>(y)? (x):(y)) /* larger of 2 arguments */
599: #define min2(x,y) ((x)<(y)? (x):(y)) /* smaller of 2 arguments */
600: #define max3(x,y,z) max2(max2(x,y),(z)) /* largest of 3 arguments */
601: #define min3(x,y,z) min2(min2(x,y),(z)) /* smallest of 3 arguments */
602: #define absval(x) ((x)>=0?(x):(-(x))) /* absolute value */
603: #define iround(x) ((int)((x)>=0?(x)+0.5:(x)-0.5)) /* round double to int */
604: #define dmod(x,y) ((x)-((y)*((double)((int)((x)/(y)))))) /*x%y for doubles*/
605: #define compress(s,c) if((s)!=NULL) /* remove embedded c's from s */ \
606: { char *p; while((p=strchr((s),(c)))!=NULL) strcpy(p,p+1); } else
607: #define slower(s) if ((s)!=NULL) /* lowercase all chars in s */ \
608: { char *p=(s); while(*p!='\000'){*p=tolower(*p); p++;} } else
609:
610: /* ---
611: * PART2
612: * ------ */
613: #if !defined(PARTS) || defined(PART2)
614: /* ==========================================================================
615: * Function: new_raster ( width, height, pixsz )
616: * Purpose: Allocation and constructor for raster.
617: * mallocs and initializes memory for width*height pixels,
618: * and returns raster struct ptr to caller.
619: * --------------------------------------------------------------------------
620: * Arguments: width (I) int containing width, in bits,
621: * of raster pixmap to be allocated
622: * height (I) int containing height, in bits/scans,
623: * of raster pixmap to be allocated
624: * pixsz (I) int containing #bits per pixel, 1 or 8
625: * --------------------------------------------------------------------------
626: * Returns: ( raster * ) ptr to allocated and initialized
627: * raster struct, or NULL for any error.
628: * --------------------------------------------------------------------------
629: * Notes:
630: * ======================================================================= */
631: /* --- entry point --- */
632: raster *new_raster ( int width, int height, int pixsz )
633: {
634: /* -------------------------------------------------------------------------
635: Allocations and Declarations
636: -------------------------------------------------------------------------- */
637: raster *rp = (raster *)NULL; /* raster ptr returned to caller */
638: pixbyte *pixmap = NULL; /* raster pixel map to be malloced */
639: int nbytes = pixsz*bitmapsz(width,height); /* #bytes needed for pixmap */
640: int filler = (isstring?' ':0); /* pixmap filler */
641: int delete_raster(); /* in case pixmap malloc() fails */
642: int npadding = (0&&issupersampling?8+256:0); /* padding bytes */
643: /* -------------------------------------------------------------------------
644: allocate and initialize raster struct and embedded bitmap
645: -------------------------------------------------------------------------- */
646: if ( msgfp!=NULL && msglevel>=9999 )
647: { fprintf(msgfp,"new_raster(%d,%d,%d)> entry point\n",
648: width,height,pixsz); fflush(msgfp); }
649: /* --- allocate and initialize raster struct --- */
650: rp = (raster *)malloc(sizeof(raster)); /* malloc raster struct */
651: if ( msgfp!=NULL && msglevel>=9999 )
652: { fprintf(msgfp,"new_raster> rp=malloc(%d) returned (%s)\n",
653: sizeof(raster),(rp==NULL?"null ptr":"success")); fflush(msgfp); }
654: if ( rp == (raster *)NULL ) /* malloc failed */
655: goto end_of_job; /* return error to caller */
656: rp->width = width; /* store width in raster struct */
657: rp->height = height; /* and store height */
658: rp->pixsz = pixsz; /* store #bits per pixel */
659: rp->pixmap = (pixbyte *)NULL; /* init bitmap as null ptr */
660: /* --- allocate and initialize bitmap array --- */
661: if ( msgfp!=NULL && msglevel>=9999 )
662: { fprintf(msgfp,"new_raster> calling pixmap=malloc(%d)\n",
663: nbytes); fflush(msgfp); }
664: if ( nbytes>0 && nbytes<=pixsz*maxraster ) /* fail if width*height too big*/
665: pixmap = (pixbyte *)malloc(nbytes+npadding); /*bytes for width*height bits*/
666: if ( msgfp!=NULL && msglevel>=9999 )
667: { fprintf(msgfp,"new_raster> pixmap=malloc(%d) returned (%s)\n",
668: nbytes,(pixmap==NULL?"null ptr":"success")); fflush(msgfp); }
669: if ( pixmap == (pixbyte *)NULL ) /* malloc failed */
670: { delete_raster(rp); /* so free everything */
671: rp = (raster *)NULL; /* reset pointer */
672: goto end_of_job; } /* and return error to caller */
673: memset((void *)pixmap,filler,nbytes); /* init bytes to binary 0's or ' 's*/
674: *pixmap = (pixbyte)0; /* and first byte alwasy 0 */
675: rp->pixmap = pixmap; /* store ptr to malloced memory */
676: /* -------------------------------------------------------------------------
677: Back to caller with address of raster struct, or NULL ptr for any error.
678: -------------------------------------------------------------------------- */
679: end_of_job:
680: if ( msgfp!=NULL && msglevel>=9999 )
681: { fprintf(msgfp,"new_raster(%d,%d,%d)> returning (%s)\n",
682: width,height,pixsz,(rp==NULL?"null ptr":"success")); fflush(msgfp); }
683: return ( rp ); /* back to caller with raster */
684: } /* --- end-of-function new_raster() --- */
685:
686:
687: /* ==========================================================================
688: * Function: new_subraster ( width, height, pixsz )
689: * Purpose: Allocate a new subraster along with
690: * an embedded raster of width x height.
691: * --------------------------------------------------------------------------
692: * Arguments: width (I) int containing width of embedded raster
693: * height (I) int containing height of embedded raster
694: * pixsz (I) int containing #bits per pixel, 1 or 8
695: * --------------------------------------------------------------------------
696: * Returns: ( subraster * ) ptr to newly-allocated subraster,
697: * or NULL for any error.
698: * --------------------------------------------------------------------------
699: * Notes: o if width or height <=0, embedded raster not allocated
700: * ======================================================================= */
701: /* --- entry point --- */
702: subraster *new_subraster ( int width, int height, int pixsz )
703: {
704: /* -------------------------------------------------------------------------
705: Allocations and Declarations
706: -------------------------------------------------------------------------- */
707: subraster *sp=NULL; /* subraster returned to caller */
708: raster *new_raster(), *rp=NULL; /* image raster embedded in sp */
709: int delete_subraster(); /* in case new_raster() fails */
710: int size = NORMALSIZE, /* default size */
711: baseline = height-1; /* and baseline */
712: /* -------------------------------------------------------------------------
713: allocate and initialize subraster struct
714: -------------------------------------------------------------------------- */
715: if ( msgfp!=NULL && msglevel>=9999 )
716: { fprintf(msgfp,"new_subraster(%d,%d,%d)> entry point\n",
717: width,height,pixsz); fflush(msgfp); }
718: /* --- allocate subraster struct --- */
719: sp = (subraster *)malloc(sizeof(subraster)); /* malloc subraster struct */
720: if ( sp == (subraster *)NULL ) /* malloc failed */
721: goto end_of_job; /* return error to caller */
722: /* --- initialize subraster struct --- */
723: sp->type = NOVALUE; /* character or image raster */
724: sp->symdef = (mathchardef *)NULL; /* mathchardef identifying image */
725: sp->baseline = baseline; /*0 if image is entirely descending*/
726: sp->size = size; /* font size 0-4 */
727: sp->toprow = sp->leftcol = (-1); /* upper-left corner of subraster */
728: sp->image = (raster *)NULL; /*ptr to bitmap image of subraster*/
729: /* -------------------------------------------------------------------------
730: allocate raster and embed it in subraster, and return to caller
731: -------------------------------------------------------------------------- */
732: /* --- allocate raster struct if desired --- */
733: if ( width>0 && height>0 && pixsz>0 ) /* caller wants raster */
734: { if ( (rp=new_raster(width,height,pixsz)) /* allocate embedded raster */
735: != NULL ) /* if allocate succeeded */
736: sp->image = rp; /* embed raster in subraster */
737: else /* or if allocate failed */
738: { delete_subraster(sp); /* free non-unneeded subraster */
739: sp = NULL; } } /* signal error */
740: /* --- back to caller with new subraster or NULL --- */
741: end_of_job:
742: if ( msgfp!=NULL && msglevel>=9999 )
743: { fprintf(msgfp,"new_subraster(%d,%d,%d)> returning (%s)\n",
744: width,height,pixsz,(sp==NULL?"null ptr":"success")); fflush(msgfp); }
745: return ( sp );
746: } /* --- end-of-function new_subraster() --- */
747:
748:
749: /* ==========================================================================
750: * Function: new_chardef ( )
751: * Purpose: Allocates and initializes a chardef struct,
752: * but _not_ the embedded raster struct.
753: * --------------------------------------------------------------------------
754: * Arguments: none
755: * --------------------------------------------------------------------------
756: * Returns: ( chardef * ) ptr to allocated and initialized
757: * chardef struct, or NULL for any error.
758: * --------------------------------------------------------------------------
759: * Notes:
760: * ======================================================================= */
761: /* --- entry point --- */
762: chardef *new_chardef ( )
763: {
764: /* -------------------------------------------------------------------------
765: Allocations and Declarations
766: -------------------------------------------------------------------------- */
767: chardef *cp = (chardef *)NULL; /* chardef ptr returned to caller */
768: /* -------------------------------------------------------------------------
769: allocate and initialize chardef struct
770: -------------------------------------------------------------------------- */
771: cp = (chardef *)malloc(sizeof(chardef)); /* malloc chardef struct */
772: if ( cp == (chardef *)NULL ) /* malloc failed */
773: goto end_of_job; /* return error to caller */
774: cp->charnum = cp->location = 0; /* init character description */
775: cp->toprow = cp->topleftcol = 0; /* init upper-left corner */
776: cp->botrow = cp->botleftcol = 0; /* init lower-left corner */
777: cp->image.width = cp->image.height = 0; /* init raster dimensions */
778: cp->image.pixsz = 0; /* and #bits per pixel */
779: cp->image.pixmap = NULL; /* init raster pixmap as null */
780: /* -------------------------------------------------------------------------
781: Back to caller with address of chardef struct, or NULL ptr for any error.
782: -------------------------------------------------------------------------- */
783: end_of_job:
784: return ( cp );
785: } /* --- end-of-function new_chardef() --- */
786:
787:
788: /* ==========================================================================
789: * Function: delete_raster ( rp )
790: * Purpose: Destructor for raster.
791: * Frees memory for raster bitmap and struct.
792: * --------------------------------------------------------------------------
793: * Arguments: rp (I) ptr to raster struct to be deleted.
794: * --------------------------------------------------------------------------
795: * Returns: ( int ) 1 if completed successfully,
796: * or 0 otherwise (for any error).
797: * --------------------------------------------------------------------------
798: * Notes:
799: * ======================================================================= */
800: /* --- entry point --- */
801: int delete_raster ( raster *rp )
802: {
803: /* -------------------------------------------------------------------------
804: free raster bitmap and struct
805: -------------------------------------------------------------------------- */
806: if ( rp != (raster *)NULL ) /* can't free null ptr */
807: {
808: if ( rp->pixmap != (pixbyte *)NULL ) /* can't free null ptr */
809: free((void *)rp->pixmap); /* free pixmap within raster */
810: free((void *)rp); /* lastly, free raster struct */
811: } /* --- end-of-if(rp!=NULL) --- */
812: return ( 1 ); /* back to caller, 1=okay 0=failed */
813: } /* --- end-of-function delete_raster() --- */
814:
815:
816: /* ==========================================================================
817: * Function: delete_subraster ( sp )
818: * Purpose: Deallocates a subraster (and embedded raster)
819: * --------------------------------------------------------------------------
820: * Arguments: sp (I) ptr to subraster struct to be deleted.
821: * --------------------------------------------------------------------------
822: * Returns: ( int ) 1 if completed successfully,
823: * or 0 otherwise (for any error).
824: * --------------------------------------------------------------------------
825: * Notes:
826: * ======================================================================= */
827: /* --- entry point --- */
828: int delete_subraster ( subraster *sp )
829: {
830: /* -------------------------------------------------------------------------
831: free subraster struct
832: -------------------------------------------------------------------------- */
833: int delete_raster(); /* to delete embedded raster */
834: if ( sp != (subraster *)NULL ) /* can't free null ptr */
835: {
836: if ( sp->type != CHARASTER ) /* not static character data */
837: if ( sp->image != NULL ) /*raster allocated within subraster*/
838: delete_raster(sp->image); /* so free embedded raster */
839: free((void *)sp); /* and free subraster struct itself*/
840: } /* --- end-of-if(sp!=NULL) --- */
841: return ( 1 ); /* back to caller, 1=okay 0=failed */
842: } /* --- end-of-function delete_subraster() --- */
843:
844:
845: /* ==========================================================================
846: * Function: delete_chardef ( cp )
847: * Purpose: Deallocates a chardef (and bitmap of embedded raster)
848: * --------------------------------------------------------------------------
849: * Arguments: cp (I) ptr to chardef struct to be deleted.
850: * --------------------------------------------------------------------------
851: * Returns: ( int ) 1 if completed successfully,
852: * or 0 otherwise (for any error).
853: * --------------------------------------------------------------------------
854: * Notes:
855: * ======================================================================= */
856: /* --- entry point --- */
857: int delete_chardef ( chardef *cp )
858: {
859: /* -------------------------------------------------------------------------
860: free chardef struct
861: -------------------------------------------------------------------------- */
862: if ( cp != (chardef *)NULL ) /* can't free null ptr */
863: {
864: if ( cp->image.pixmap != NULL ) /* pixmap allocated within raster */
865: free((void *)cp->image.pixmap); /* so free embedded pixmap */
866: free((void *)cp); /* and free chardef struct itself */
867: } /* --- end-of-if(cp!=NULL) --- */
868: /* -------------------------------------------------------------------------
869: Back to caller with 1=okay, 0=failed.
870: -------------------------------------------------------------------------- */
871: return ( 1 );
872: } /* --- end-of-function delete_chardef() --- */
873:
874:
875: /* ==========================================================================
876: * Function: rastcpy ( rp )
877: * Purpose: makes duplicate copy of rp
878: * --------------------------------------------------------------------------
879: * Arguments: rp (I) ptr to raster struct to be copied
880: * --------------------------------------------------------------------------
881: * Returns: ( raster * ) ptr to new copy rp,
882: * or NULL for any error.
883: * --------------------------------------------------------------------------
884: * Notes: o
885: * ======================================================================= */
886: /* --- entry point --- */
887: raster *rastcpy ( raster *rp )
888: {
889: /* -------------------------------------------------------------------------
890: Allocations and Declarations
891: -------------------------------------------------------------------------- */
892: raster *new_raster(), *newrp=NULL; /*copied raster returned to caller*/
893: int height= (rp==NULL?0:rp->height), /* original and copied height */
894: width = (rp==NULL?0:rp->width), /* original and copied width */
895: pixsz = (rp==NULL?0:rp->pixsz), /* #bits per pixel */
896: nbytes= (rp==NULL?0:(pixmapsz(rp))); /* #bytes in rp's pixmap */
897: /* -------------------------------------------------------------------------
898: allocate rotated raster and fill it
899: -------------------------------------------------------------------------- */
900: /* --- allocate copied raster with same width,height, and copy bitmap --- */
901: if ( rp != NULL ) /* nothing to copy if ptr null */
902: if ( (newrp = new_raster(width,height,pixsz)) /*same width,height in copy*/
903: != NULL ) /* check that allocate succeeded */
904: memcpy(newrp->pixmap,rp->pixmap,nbytes); /* fill copied raster pixmap */
905: return ( newrp ); /* return copied raster to caller */
906: } /* --- end-of-function rastcpy() --- */
907:
908:
909: /* ==========================================================================
910: * Function: subrastcpy ( sp )
911: * Purpose: makes duplicate copy of sp
912: * --------------------------------------------------------------------------
913: * Arguments: sp (I) ptr to subraster struct to be copied
914: * --------------------------------------------------------------------------
915: * Returns: ( subraster * ) ptr to new copy sp,
916: * or NULL for any error.
917: * --------------------------------------------------------------------------
918: * Notes: o
919: * ======================================================================= */
920: /* --- entry point --- */
921: subraster *subrastcpy ( subraster *sp )
922: {
923: /* -------------------------------------------------------------------------
924: Allocations and Declarations
925: -------------------------------------------------------------------------- */
926: subraster *new_subraster(), *newsp=NULL; /* allocate new subraster */
927: raster *rastcpy(), *newrp=NULL; /* and new raster image within it */
928: int delete_subraster(); /* dealloc newsp if rastcpy() fails*/
929: /* -------------------------------------------------------------------------
930: make copy, and return it to caller
931: -------------------------------------------------------------------------- */
932: if ( sp == NULL ) goto end_of_job; /* nothing to copy */
933: /* --- allocate new subraster "envelope" for copy --- */
934: if ( (newsp=new_subraster(0,0,0)) /* allocate subraster "envelope" */
935: == NULL ) goto end_of_job; /* and quit if we fail to allocate */
936: /* --- transparently copy original envelope to new one --- */
937: memcpy((void *)newsp,(void *)sp,sizeof(subraster)); /* copy envelope */
938: /* --- make a copy of the rasterized image itself, if there is one --- */
939: if ( sp->image != NULL ) /* there's an image embedded in sp */
940: if ( (newrp = rastcpy(sp->image)) /* so copy rasterized image in sp */
941: == NULL ) /* failed to copy successfully */
942: { delete_subraster(newsp); /* won't need newsp any more */
943: newsp = NULL; /* because we're returning error */
944: goto end_of_job; } /* back to caller with error signal*/
945: /* --- set new params in new envelope --- */
946: newsp->image = newrp; /* new raster image we just copied */
947: switch ( sp->type ) /* set new raster image type */
948: { case STRINGRASTER: case CHARASTER: newsp->type = STRINGRASTER; break;
949: case ASCIISTRING: newsp->type = ASCIISTRING; break;
950: case IMAGERASTER: default: newsp->type = IMAGERASTER; break; }
951: /* --- return copy of sp to caller --- */
952: end_of_job:
953: return ( newsp ); /* copy back to caller */
954: } /* --- end-of-function subrastcpy() --- */
955:
956:
957: /* ==========================================================================
958: * Function: rastrot ( rp )
959: * Purpose: rotates rp image 90 degrees right/clockwise
960: * --------------------------------------------------------------------------
961: * Arguments: rp (I) ptr to raster struct to be rotated
962: * --------------------------------------------------------------------------
963: * Returns: ( raster * ) ptr to new raster rotated ralative to rp,
964: * or NULL for any error.
965: * --------------------------------------------------------------------------
966: * Notes: o An underbrace is } rotated 90 degrees clockwise,
967: * a hat is <, etc.
968: * ======================================================================= */
969: /* --- entry point --- */
970: raster *rastrot ( raster *rp )
971: {
972: /* -------------------------------------------------------------------------
973: Allocations and Declarations
974: -------------------------------------------------------------------------- */
975: raster *new_raster(), *rotated=NULL; /*rotated raster returned to caller*/
976: int height = rp->height, irow, /* original height, row index */
977: width = rp->width, icol, /* original width, column index */
978: pixsz = rp->pixsz; /* #bits per pixel */
979: /* -------------------------------------------------------------------------
980: allocate rotated raster and fill it
981: -------------------------------------------------------------------------- */
982: /* --- allocate rotated raster with flipped width<-->height --- */
983: if ( (rotated = new_raster(height,width,pixsz)) /* flip width,height */
984: != NULL ) /* check that allocation succeeded */
985: /* --- fill rotated raster --- */
986: for ( irow=0; irow<height; irow++ ) /* for each row of rp */
987: for ( icol=0; icol<width; icol++ ) /* and each column of rp */
988: { int value = getpixel(rp,irow,icol);
989: /* setpixel(rotated,icol,irow,value); } */
990: setpixel(rotated,icol,(height-1-irow),value); }
991: return ( rotated ); /* return rotated raster to caller */
992: } /* --- end-of-function rastrot() --- */
993:
994:
995: /* ==========================================================================
996: * Function: rastput ( target, source, top, left, isopaque )
997: * Purpose: Overlays source onto target,
998: * with the 0,0-bit of source onto the top,left-bit of target.
999: * --------------------------------------------------------------------------
1000: * Arguments: target (I) ptr to target raster struct
1001: * source (I) ptr to source raster struct
1002: * top (I) int containing 0 ... target->height - 1
1003: * left (I) int containing 0 ... target->width - 1
1004: * isopaque (I) int containing false (zero) to allow
1005: * original 1-bits of target to "show through"
1006: * 0-bits of source.
1007: * --------------------------------------------------------------------------
1008: * Returns: ( int ) 1 if completed successfully,
1009: * or 0 otherwise (for any error).
1010: * --------------------------------------------------------------------------
1011: * Notes:
1012: * ======================================================================= */
1013: /* --- entry point --- */
1014: int rastput ( raster *target, raster *source,
1015: int top, int left, int isopaque )
1016: {
1017: /* -------------------------------------------------------------------------
1018: Allocations and Declarations
1019: -------------------------------------------------------------------------- */
1020: int irow, icol, /* indexes over source raster */
1021: twidth=target->width, theight=target->height, /*target width,height*/
1022: tpix, ntpix = twidth*theight; /* #pixels in target */
1023: int isfatal = 0, /* true to abend on out-of-bounds error */
1024: isstrict = 0/*1*/, /* true for strict bounds check - no "wrap"*/
1025: isokay = 1; /* true if no pixels out-of-bounds */
1026: /* -------------------------------------------------------------------------
1027: superimpose source onto target, one bit at a time
1028: -------------------------------------------------------------------------- */
1029: if ( isstrict && (top<0 || left<0) ) /* args fail strict test */
1030: isokay = 0; /* so just return error */
1031: else
1032: for ( irow=0; irow<source->height; irow++ ) /* for each scan line */
1033: {
1034: tpix = (top+irow)*target->width + left - 1; /*first target pixel (-1)*/
1035: for ( icol=0; icol<source->width; icol++ ) /* each pixel in scan line */
1036: {
1037: int svalue = getpixel(source,irow,icol); /* source pixel value */
1038: ++tpix; /* bump target pixel */
1039: if ( msgfp!=NULL && msglevel>=9999 ) /* debugging output */
1040: { fprintf(msgfp,"rastput> tpix,ntpix=%d,%d top,irow,theight=%d,%d,%d "
1041: "left,icol,twidth=%d,%d,%d\n", tpix,ntpix, top,irow,theight,
1042: left,icol,twidth); fflush(msgfp); }
1043: if ( tpix >= ntpix /* bounds check failed */
1044: || (isstrict && (irow+top>=theight || icol+left>=twidth)) )
1045: { isokay = 0; /* reset okay flag */
1046: if ( isfatal ) goto end_of_job; /* abort if error is fatal */
1047: else break; } /*or just go on to next row*/
1048: if ( tpix >= 0 ) /* bounds check okay */
1049: if ( svalue!=0 || isopaque ) /*got dark or opaque source*/
1050: setpixel(target,irow+top,icol+left,svalue); /*overlay source on target*/
1051: } /* --- end-of-for(icol) --- */
1052: } /* --- end-of-for(irow) --- */
1053: /* -------------------------------------------------------------------------
1054: Back to caller with 1=okay, 0=failed.
1055: -------------------------------------------------------------------------- */
1056: end_of_job:
1057: return ( isokay /*isfatal? (tpix<ntpix? 1:0) : 1*/ );
1058: } /* --- end-of-function rastput() --- */
1059:
1060:
1061: /* ==========================================================================
1062: * Function: rastcompose ( sp1, sp2, offset2, isalign, isfree )
1063: * Purpose: Overlays sp2 on top of sp1, leaving both unchanged
1064: * and returning a newly-allocated composite subraster.
1065: * Frees/deletes input sp1 and/or sp2 depending on value
1066: * of isfree (0=none, 1=sp1, 2=sp2, 3=both).
1067: * --------------------------------------------------------------------------
1068: * Arguments: sp1 (I) subraster * to "underneath" subraster,
1069: * whose baseline is preserved
1070: * sp2 (I) subraster * to "overlaid" subraster
1071: * offset2 (I) int containing 0 or number of pixels
1072: * to horizontally shift sp2 relative to sp1,
1073: * either positive (right) or negative
1074: * isalign (I) int containing 1 to align baselines,
1075: * or 0 to vertically center sp2 over sp1
1076: * isfree (I) int containing 1=free sp1 before return,
1077: * 2=free sp2, 3=free both, 0=free none.
1078: * --------------------------------------------------------------------------
1079: * Returns: ( subraster * ) pointer to constructed subraster
1080: * or NULL for any error
1081: * --------------------------------------------------------------------------
1082: * Notes:
1083: * ======================================================================= */
1084: /* --- entry point --- */
1085: subraster *rastcompose ( subraster *sp1, subraster *sp2, int offset2,
1086: int isalign, int isfree )
1087: {
1088: /* -------------------------------------------------------------------------
1089: Allocations and Declarations
1090: -------------------------------------------------------------------------- */
1091: subraster *new_subraster(), *sp=(subraster *)NULL; /* returned subraster */
1092: raster *rp=(raster *)NULL; /* new composite raster in sp */
1093: int delete_subraster(); /* in case isfree non-zero */
1094: int rastput(); /*place sp1,sp2 in composite raster*/
1095: int base1 = sp1->baseline, /*baseline for underlying subraster*/
1096: height1 = (sp1->image)->height, /* height for underlying subraster */
1097: width1 = (sp1->image)->width, /* width for underlying subraster */
1098: pixsz1 = (sp1->image)->pixsz, /* pixsz for underlying subraster */
1099: base2 = sp2->baseline, /*baseline for overlaid subraster */
1100: height2 = (sp2->image)->height, /* height for overlaid subraster */
1101: width2 = (sp2->image)->width, /* width for overlaid subraster */
1102: pixsz2 = (sp2->image)->pixsz; /* pixsz for overlaid subraster */
1103: int height=0, width=0, pixsz=0, base=0; /* overlaid composite */
1104: /* -------------------------------------------------------------------------
1105: Initialization
1106: -------------------------------------------------------------------------- */
1107: /* --- determine height, width and baseline of composite raster --- */
1108: if ( isalign ) /* baselines of sp1,sp2 aligned */
1109: { height = max2(base1+1,base2+1) /* max height above baseline */
1110: + max2(height1-base1-1,height2-base2-1); /*+ max descending below*/
1111: base = max2(base1,base2); } /* max space above baseline */
1112: else /* baselines not aligned */
1113: { height = max2(height1,height2); /* max height */
1114: base = base1 + (height-height1)/2; } /* baseline for sp1 */
1115: width = max2(width1,width2+abs(offset2)); /* max width */
1116: pixsz = max2(pixsz1,pixsz2); /* bitmap,bytemap becomes bytemap */
1117: /* -------------------------------------------------------------------------
1118: allocate concatted composite subraster
1119: -------------------------------------------------------------------------- */
1120: /* --- allocate returned subraster (and then initialize it) --- */
1121: if ( (sp=new_subraster(width,height,pixsz)) /* allocate new subraster */
1122: == (subraster *)NULL ) goto end_of_job; /* failed, so quit */
1123: /* --- initialize subraster parameters --- */
1124: sp->type = IMAGERASTER; /* image */
1125: sp->baseline = base; /* composite baseline */
1126: sp->size = sp1->size; /* underlying char is sp1 */
1127: /* --- extract raster from subraster --- */
1128: rp = sp->image; /* raster allocated in subraster */
1129: /* -------------------------------------------------------------------------
1130: overlay sp1 and sp2 in new composite raster
1131: -------------------------------------------------------------------------- */
1132: if ( isalign )
1133: { rastput (rp, sp1->image, base-base1, (width-width1)/2, 1); /*underlying*/
1134: rastput (rp, sp2->image, base-base2, /*overlaid*/
1135: (width-width2)/2+offset2, 0); }
1136: else
1137: { rastput (rp, sp1->image, base-base1, (width-width1)/2, 1); /*underlying*/
1138: rastput (rp, sp2->image, (height-height2)/2, /*overlaid*/
1139: (width-width2)/2+offset2, 0); }
1140: /* -------------------------------------------------------------------------
1141: free input if requested
1142: -------------------------------------------------------------------------- */
1143: if ( isfree > 0 ) /* caller wants input freed */
1144: { if ( isfree==1 || isfree>2 ) delete_subraster(sp1); /* free sp1 */
1145: if ( isfree >= 2 ) delete_subraster(sp2); } /* and/or sp2 */
1146: /* -------------------------------------------------------------------------
1147: Back to caller with pointer to concatted subraster or with null for error
1148: -------------------------------------------------------------------------- */
1149: end_of_job:
1150: return ( sp ); /* back with subraster or null ptr */
1151: } /* --- end-of-function rastcompose() --- */
1152:
1153:
1154: /* ==========================================================================
1155: * Function: rastcat ( sp1, sp2, isfree )
1156: * Purpose: "Concatanates" subrasters sp1||sp2, leaving both unchanged
1157: * and returning a newly-allocated subraster.
1158: * Frees/deletes input sp1 and/or sp2 depending on value
1159: * of isfree (0=none, 1=sp1, 2=sp2, 3=both).
1160: * --------------------------------------------------------------------------
1161: * Arguments: sp1 (I) subraster * to left-hand subraster
1162: * sp2 (I) subraster * to right-hand subraster
1163: * isfree (I) int containing 1=free sp1 before return,
1164: * 2=free sp2, 3=free both, 0=free none.
1165: * --------------------------------------------------------------------------
1166: * Returns: ( subraster * ) pointer to constructed subraster sp1||sp2
1167: * or NULL for any error
1168: * --------------------------------------------------------------------------
1169: * Notes:
1170: * ======================================================================= */
1171: /* --- entry point --- */
1172: subraster *rastcat ( subraster *sp1, subraster *sp2, int isfree )
1173: {
1174: /* -------------------------------------------------------------------------
1175: Allocations and Declarations
1176: -------------------------------------------------------------------------- */
1177: subraster *new_subraster(), *sp=(subraster *)NULL; /* returned subraster */
1178: raster *rp=(raster *)NULL; /* new concatted raster */
1179: int delete_subraster(); /* in case isfree non-zero */
1180: int rastput(); /*place sp1,sp2 in concatted raster*/
1181: int type_raster(); /* debugging display */
1182: int base1 = sp1->baseline, /*baseline for left-hand subraster*/
1183: height1 = (sp1->image)->height, /* height for left-hand subraster */
1184: width1 = (sp1->image)->width, /* width for left-hand subraster */
1185: pixsz1 = (sp1->image)->pixsz, /* pixsz for left-hand subraster */
1186: type1 = sp1->type, /* image type for left-hand */
1187: base2 = sp2->baseline, /*baseline for right-hand subraster*/
1188: height2 = (sp2->image)->height, /* height for right-hand subraster */
1189: width2 = (sp2->image)->width, /* width for right-hand subraster */
1190: pixsz2 = (sp2->image)->pixsz, /* pixsz for right-hand subraster */
1191: type2 = sp2->type; /* image type for right-hand */
1192: int height=0, width=0, pixsz=0, base=0; /*concatted sp1||sp2 composite*/
1193: int issquash = (squashmargin!=0?1:0), /* true to "squash" sp1||sp2 */
1194: isopaque = (issquash?0:1), /* not oppaque if squashing */
1195: rastsquash(), isblank=0, nsquash=0, /* #cols to squash */
1196: oldsquashmargin = squashmargin; /* save original squashmargin */
1197: int blanksignal = (-991234); /*rastsquash signal right-hand blank*/
1198: mathchardef *symdef1 = sp1->symdef, /*mathchardef of last left-hand char*/
1199: *symdef2 = sp2->symdef; /* mathchardef of right-hand char */
1200: int class1 = (symdef1==NULL?ORDINARY:symdef1->class), /* symdef->class */
1201: class2 = (symdef2==NULL?ORDINARY:symdef2->class), /* or default */
1202: smash1 = (symdef1!=NULL)&&(class1==ORDINARY||class1==VARIABLE||
1203: class1==OPENING||class1==CLOSING||class1==PUNCTION),
1204: smash2 = (symdef2!=NULL)&&(class2==ORDINARY||class2==VARIABLE||
1205: class2==OPENING||class2==CLOSING||class2==PUNCTION),
1206: space = fontsize/2+1; /* #cols between sp1 and sp2 */
1207: /* -------------------------------------------------------------------------
1208: Initialization
1209: -------------------------------------------------------------------------- */
1210: /* --- determine inter-character space from character class --- */
1211: if ( !isstring )
1212: space = max2(2,(symspace[class1][class2] + fontsize-3)); /* space */
1213: else space = 1; /* space for ascii string */
1214: /* --- determine squash --- */
1215: if ( !isstring ) /* don't squash strings */
1216: if ( issquash ) { /* raster squash wanted */
1217: int maxsquash = rastsquash(sp1,sp2), /* calculate max squash space */
1218: margin = squashmargin; /* init margin without delta */
1219: if ( (1 && smash1 && smash2) /* concatanating two chars */
1220: || (1 && type1!=IMAGERASTER && type2!=IMAGERASTER) )
1221: /*maxsquash = 0;*/ /* turn off squash */
1222: margin = max2(space-1,0); /* force small squashmargin */
1223: else /* adjust for delta if images */
1224: if ( issquashdelta ) /* squashmargin is a delta value */
1225: margin += fontsize; /* add displaystyle base to margin */
1226: if ( maxsquash == blanksignal ) /* sp2 is intentional blank */
1227: isblank = 1; /* set blank flag signal */
1228: else /* see how much extra space we have*/
1229: if ( maxsquash > margin ) /* enough space for adjustment */
1230: nsquash = maxsquash-margin; /* make adjustment */
1231: if ( msgfp!=NULL && msglevel>=99 ) /* display squash results */
1232: { fprintf(msgfp,"rastcat> maxsquash=%d, margin=%d, nsquash=%d\n",
1233: maxsquash,margin,nsquash);
1234: fprintf(msgfp,"rastcat> type1=%d,2=%d, class1=%d,2=%d\n", type1,type2,
1235: (symdef1==NULL?-999:class1),(symdef2==NULL?-999:class2));
1236: fflush(msgfp); }
1237: } /* --- end-of-if(issquash) --- */
1238: /* --- determine height, width and baseline of composite raster --- */
1239: if ( !isstring )
1240: { height = max2(base1+1,base2+1) /* max height above baseline */
1241: + max2(height1-base1-1,height2-base2-1); /*+ max descending below*/
1242: width = width1+width2 + space-nsquash; /*add widths and space-squash*/
1243: width = max3(width,width1,width2); } /* don't "over-squash" composite */
1244: else /* ascii string */
1245: { height = 1; /* default */
1246: width = width1 + width2 + space - 1; } /* no need for two nulls */
1247: pixsz = max2(pixsz1,pixsz2); /* bitmap||bytemap becomes bytemap */
1248: base = max2(base1,base2); /* max space above baseline */
1249: if ( msgfp!=NULL && msglevel>=9999 ) /* display components */
1250: { fprintf(msgfp,"rastcat> Left-hand ht,width,pixsz,base = %d,%d,%d,%d\n",
1251: height1,width1,pixsz1,base1);
1252: type_raster(sp1->image,msgfp); /* display left-hand raster */
1253: fprintf(msgfp,"rastcat> Right-hand ht,width,pixsz,base = %d,%d,%d,%d\n",
1254: height2,width2,pixsz2,base2);
1255: type_raster(sp2->image,msgfp); /* display right-hand raster */
1256: fprintf(msgfp,
1257: "rastcat> Composite ht,width,squash,pixsz,base = %d,%d,%d,%d,%d\n",
1258: height,width,nsquash,pixsz,base);
1259: fflush(msgfp); } /* flush msgfp buffer */
1260: /* -------------------------------------------------------------------------
1261: allocate concatted composite subraster
1262: -------------------------------------------------------------------------- */
1263: /* --- allocate returned subraster (and then initialize it) --- */
1264: if ( msgfp!=NULL && msglevel>=9999 )
1265: { fprintf(msgfp,"rastcat> calling new_subraster(%d,%d,%d)\n",
1266: width,height,pixsz); fflush(msgfp); }
1267: if ( (sp=new_subraster(width,height,pixsz)) /* allocate new subraster */
1268: == (subraster *)NULL ) /* failed */
1269: { if ( msgfp!=NULL && msglevel>=1 ) /* report failure */
1270: { fprintf(msgfp,"rastcat> new_subraster(%d,%d,%d) failed\n",
1271: width,height,pixsz); fflush(msgfp); }
1272: goto end_of_job; } /* failed, so quit */
1273: /* --- initialize subraster parameters --- */
1274: /* sp->type = (!isstring?STRINGRASTER:ASCIISTRING); */ /*concatted string*/
1275: if ( !isstring )
1276: sp->type = type2;/*(type1==type2?type2:IMAGERASTER);*/ /*string or image*/
1277: else
1278: sp->type = ASCIISTRING; /* concatted ascii string */
1279: sp->symdef = symdef2; /* rightmost char is sp2 */
1280: sp->baseline = base; /* composite baseline */
1281: sp->size = sp2->size; /* rightmost char is sp2 */
1282: if ( isblank ) /* need to propagate blanksignal */
1283: sp->type = blanksignal; /* may not be completely safe??? */
1284: /* --- extract raster from subraster --- */
1285: rp = sp->image; /* raster allocated in subraster */
1286: /* -------------------------------------------------------------------------
1287: overlay sp1 and sp2 in new composite raster
1288: -------------------------------------------------------------------------- */
1289: if ( msgfp!=NULL && msglevel>=9999 )
1290: { fprintf(msgfp,"rastcat> calling rastput() to concatanate left||right\n");
1291: fflush(msgfp); } /* flush msgfp buffer */
1292: if ( !isstring )
1293: rastput (rp, sp1->image, base-base1, /* overlay left-hand */
1294: max2(0,nsquash-width1), 1); /* plus any residual squash space */
1295: else
1296: memcpy(rp->pixmap,(sp1->image)->pixmap,width1-1); /*init left string*/
1297: if ( msgfp!=NULL && msglevel>=9999 )
1298: { type_raster(sp->image,msgfp); /* display composite raster */
1299: fflush(msgfp); } /* flush msgfp buffer */
1300: if ( !isstring )
1301: rastput (rp, sp2->image, base-base2, /* overlay right-hand */
1302: max2(0,width1+space-nsquash), isopaque); /* minus any squashed space */
1303: else
1304: { strcpy((char *)(rp->pixmap)+width1-1+space,(char *)((sp2->image)->pixmap));
1305: ((char *)(rp->pixmap))[width1+width2+space-2] = '\000'; } /*null-term*/
1306: if ( msgfp!=NULL && msglevel>=9999 )
1307: { type_raster(sp->image,msgfp); /* display composite raster */
1308: fflush(msgfp); } /* flush msgfp buffer */
1309: /* -------------------------------------------------------------------------
1310: free input if requested
1311: -------------------------------------------------------------------------- */
1312: if ( isfree > 0 ) /* caller wants input freed */
1313: { if ( isfree==1 || isfree>2 ) delete_subraster(sp1); /* free sp1 */
1314: if ( isfree >= 2 ) delete_subraster(sp2); } /* and/or sp2 */
1315: /* -------------------------------------------------------------------------
1316: Back to caller with pointer to concatted subraster or with null for error
1317: -------------------------------------------------------------------------- */
1318: end_of_job:
1319: squashmargin = oldsquashmargin; /* reset original squashmargin */
1320: return ( sp ); /* back with subraster or null ptr */
1321: } /* --- end-of-function rastcat() --- */
1322:
1323:
1324: /* ==========================================================================
1325: * Function: rastack ( sp1, sp2, base, space, iscenter, isfree )
1326: * Purpose: Stack subrasters sp2 atop sp1, leaving both unchanged
1327: * and returning a newly-allocated subraster,
1328: * whose baseline is sp1's if base=1, or sp2's if base=2.
1329: * Frees/deletes input sp1 and/or sp2 depending on value
1330: * of isfree (0=none, 1=sp1, 2=sp2, 3=both).
1331: * --------------------------------------------------------------------------
1332: * Arguments: sp1 (I) subraster * to lower subraster
1333: * sp2 (I) subraster * to upper subraster
1334: * base (I) int containing 1 if sp1 is baseline,
1335: * or 2 if sp2 is baseline.
1336: * space (I) int containing #rows blank space inserted
1337: * between sp1's image and sp2's image.
1338: * iscenter (I) int containing 1 to center both sp1 and sp2
1339: * in stacked array, 0 to left-justify both
1340: * isfree (I) int containing 1=free sp1 before return,
1341: * 2=free sp2, 3=free both, 0=free none.
1342: * --------------------------------------------------------------------------
1343: * Returns: ( subraster * ) pointer to constructed subraster sp2 atop sp1
1344: * or NULL for any error
1345: * --------------------------------------------------------------------------
1346: * Notes:
1347: * ======================================================================= */
1348: /* --- entry point --- */
1349: subraster *rastack ( subraster *sp1, subraster *sp2,
1350: int base, int space, int iscenter, int isfree )
1351: {
1352: /* -------------------------------------------------------------------------
1353: Allocations and Declarations
1354: -------------------------------------------------------------------------- */
1355: subraster *new_subraster(), *sp=(subraster *)NULL; /* returned subraster */
1356: raster *rp=(raster *)NULL; /* new stacked raster in sp */
1357: int delete_subraster(); /* in case isfree non-zero */
1358: int rastput(); /* place sp1,sp2 in stacked raster */
1359: int base1 = sp1->baseline, /* baseline for lower subraster */
1360: height1 = (sp1->image)->height, /* height for lower subraster */
1361: width1 = (sp1->image)->width, /* width for lower subraster */
1362: pixsz1 = (sp1->image)->pixsz, /* pixsz for lower subraster */
1363: base2 = sp2->baseline, /* baseline for upper subraster */
1364: height2 = (sp2->image)->height, /* height for upper subraster */
1365: width2 = (sp2->image)->width, /* width for upper subraster */
1366: pixsz2 = (sp2->image)->pixsz; /* pixsz for upper subraster */
1367: int height=0, width=0, pixsz=0, baseline=0; /*for stacked sp2 atop sp1*/
1368: mathchardef *symdef1 = sp1->symdef, /* mathchardef of right lower char */
1369: *symdef2 = sp2->symdef; /* mathchardef of right upper char */
1370: /* -------------------------------------------------------------------------
1371: Initialization
1372: -------------------------------------------------------------------------- */
1373: /* --- determine height, width and baseline of composite raster --- */
1374: height = height1 + space + height2; /* sum of heights plus space */
1375: width = max2(width1,width2); /* max width is overall width */
1376: pixsz = max2(pixsz1,pixsz2); /* bitmap||bytemap becomes bytemap */
1377: baseline = (base==1? height2+space+base1 : (base==2? base2 : 0));
1378: /* -------------------------------------------------------------------------
1379: allocate stacked composite subraster (with embedded raster)
1380: -------------------------------------------------------------------------- */
1381: /* --- allocate returned subraster (and then initialize it) --- */
1382: if ( (sp=new_subraster(width,height,pixsz)) /* allocate new subraster */
1383: == (subraster *)NULL ) goto end_of_job; /* failed, so quit */
1384: /* --- initialize subraster parameters --- */
1385: sp->type = IMAGERASTER; /* stacked rasters */
1386: sp->symdef = (base==1? symdef1 : (base==2? symdef2 : NULL)); /* symdef */
1387: sp->baseline = baseline; /* composite baseline */
1388: sp->size = (base==1? sp1->size : (base==2? sp2->size : NORMALSIZE)); /*size*/
1389: /* --- extract raster from subraster --- */
1390: rp = sp->image; /* raster embedded in subraster */
1391: /* -------------------------------------------------------------------------
1392: overlay sp1 and sp2 in new composite raster
1393: -------------------------------------------------------------------------- */
1394: if ( iscenter == 1 ) /* center both sp1 and sp2 */
1395: { rastput (rp, sp2->image, 0, (width-width2)/2, 1); /* overlay upper */
1396: rastput (rp, sp1->image, height2+space, (width-width1)/2, 1); } /*lower*/
1397: else /* left-justify both sp1 and sp2 */
1398: { rastput (rp, sp2->image, 0, 0, 1); /* overlay upper */
1399: rastput (rp, sp1->image, height2+space, 0, 1); } /*lower*/
1400: /* -------------------------------------------------------------------------
1401: free input if requested
1402: -------------------------------------------------------------------------- */
1403: if ( isfree > 0 ) /* caller wants input freed */
1404: { if ( isfree==1 || isfree>2 ) delete_subraster(sp1); /* free sp1 */
1405: if ( isfree>=2 ) delete_subraster(sp2); } /* and/or sp2 */
1406: /* -------------------------------------------------------------------------
1407: Back to caller with pointer to stacked subraster or with null for error
1408: -------------------------------------------------------------------------- */
1409: end_of_job:
1410: return ( sp ); /* back with subraster or null ptr */
1411: } /* --- end-of-function rastack() --- */
1412:
1413:
1414: /* ==========================================================================
1415: * Function: rastile ( tiles, ntiles )
1416: * Purpose: Allocate and build up a composite raster
1417: * from the ntiles components/characters supplied in tiles.
1418: * --------------------------------------------------------------------------
1419: * Arguments: tiles (I) subraster * to array of subraster structs
1420: * describing the components and their locations
1421: * ntiles (I) int containing number of subrasters in tiles[]
1422: * --------------------------------------------------------------------------
1423: * Returns: ( raster * ) ptr to composite raster,
1424: * or NULL for any error.
1425: * --------------------------------------------------------------------------
1426: * Notes: o The top,left corner of a raster is row=0,col=0
1427: * with row# increasing as you move down,
1428: * and col# increasing as you move right.
1429: * Metafont numbers rows with the baseline=0,
1430: * so the top row is a positive number that
1431: * decreases as you move down.
1432: * o rastile() is no longer used.
1433: * It was used by an earlier rasterize() algorithm,
1434: * and I've left it in place should it be needed again.
1435: * But recent changes haven't been tested/exercised.
1436: * ======================================================================= */
1437: /* --- entry point --- */
1438: raster *rastile ( subraster *tiles, int ntiles )
1439: {
1440: /* -------------------------------------------------------------------------
1441: Allocations and Declarations
1442: -------------------------------------------------------------------------- */
1443: raster *new_raster(), *composite=(raster *)NULL; /*raster back to caller*/
1444: int width=0, height=0, pixsz=0, /*width,height,pixsz of composite raster*/
1445: toprow=9999, rightcol=-999, /* extreme upper-right corner of tiles */
1446: botrow=-999, leftcol=9999; /* extreme lower-left corner of tiles */
1447: int itile; /* tiles[] index */
1448: int rastput(); /* overlay each tile in composite raster */
1449: /* -------------------------------------------------------------------------
1450: run through tiles[] to determine dimensions for composite raster
1451: -------------------------------------------------------------------------- */
1452: /* --- determine row and column bounds of composite raster --- */
1453: for ( itile=0; itile<ntiles; itile++ )
1454: {
1455: subraster *tile = &(tiles[itile]); /* ptr to current tile */
1456: /* --- upper-left corner of composite --- */
1457: toprow = min2(toprow, tile->toprow);
1458: leftcol = min2(leftcol, tile->leftcol);
1459: /* --- lower-right corner of composite --- */
1460: botrow = max2(botrow, tile->toprow + (tile->image)->height - 1);
1461: rightcol = max2(rightcol, tile->leftcol + (tile->image)->width - 1);
1462: /* --- pixsz of composite --- */
1463: pixsz = max2(pixsz,(tile->image)->pixsz);
1464: } /* --- end-of-for(itile) --- */
1465: /* --- calculate width and height from bounds --- */
1466: width = rightcol - leftcol + 1;
1467: height = botrow - toprow + 1;
1468: /* --- sanity check (quit if bad dimensions) --- */
1469: if ( width<1 || height<1 ) goto end_of_job;
1470: /* -------------------------------------------------------------------------
1471: allocate composite raster, and embed tiles[] within it
1472: -------------------------------------------------------------------------- */
1473: /* --- allocate composite raster --- */
1474: if ( (composite=new_raster(width,height,pixsz)) /*allocate composite raster*/
1475: == (raster *)NULL ) goto end_of_job; /* and quit if failed */
1476: /* --- embed tiles[] in composite --- */
1477: for ( itile=0; itile<ntiles; itile++ )
1478: { subraster *tile = &(tiles[itile]); /* ptr to current tile */
1479: rastput (composite, tile->image, /* overlay tile image at...*/
1480: tile->toprow-toprow, tile->leftcol-leftcol, 1); } /*upper-left corner*/
1481: /* -------------------------------------------------------------------------
1482: Back to caller with composite raster (or null for any error)
1483: -------------------------------------------------------------------------- */
1484: end_of_job:
1485: return ( composite ); /* back with composite or null ptr */
1486: } /* --- end-of-function rastile() --- */
1487:
1488:
1489: /* ==========================================================================
1490: * Function: rastsquash ( sp1, sp2 )
1491: * Purpose: When concatanating sp1||sp2, calculate #pixels
1492: * we can "squash sp2 left"
1493: * --------------------------------------------------------------------------
1494: * Arguments: sp1 (I) subraster * to left-hand raster
1495: * sp2 (I) subraster * to right-hand raster
1496: * --------------------------------------------------------------------------
1497: * Returns: ( int ) max #pixels we can squash sp1||sp2,
1498: * or "blanksignal" if sp2 intentionally blank,
1499: * or 0 for any error.
1500: * --------------------------------------------------------------------------
1501: * Notes: o
1502: * ======================================================================= */
1503: /* --- entry point --- */
1504: int rastsquash ( subraster *sp1, subraster *sp2 )
1505: {
1506: /* -------------------------------------------------------------------------
1507: Allocations and Declarations
1508: -------------------------------------------------------------------------- */
1509: int nsquash = 0; /* #pixels to squash sp1||sp2 */
1510: int base1 = sp1->baseline, /*baseline for left-hand subraster*/
1511: height1 = (sp1->image)->height, /* height for left-hand subraster */
1512: width1 = (sp1->image)->width, /* width for left-hand subraster */
1513: base2 = sp2->baseline, /*baseline for right-hand subraster*/
1514: height2 = (sp2->image)->height, /* height for right-hand subraster */
1515: width2 = (sp2->image)->width; /* width for right-hand subraster */
1516: int base = max2(base1,base2), /* max ascenders - 1 above baseline*/
1517: top1=base-base1, top2=base-base2, /* top irow indexes for sp1, sp2 */
1518: bot1=top1+height1-1, bot2=top2+height2-1, /* bot irow indexes */
1519: height = max2(bot1,bot2)+1; /* total height */
1520: int irow1=0,irow2=0, icol=0; /* row,col indexes */
1521: int firstcol1[1025], nfirst1=0, /* 1st sp1 col containing set pixel*/
1522: firstcol2[1025], nfirst2=0; /* 1st sp2 col containing set pixel*/
1523: int blanksignal = (-991234); /*rastsquash signal right-hand blank*/
1524: int smin=9999, xmin=9999,ymin=9999; /* min separation (s=x+y) */
1525: int type_raster(); /* display debugging output */
1526: /* -------------------------------------------------------------------------
1527: find right edge of sp1 and left edge of sp2 (these will be abutting edges)
1528: -------------------------------------------------------------------------- */
1529: /* --- check args --- */
1530: if ( isstring ) goto end_of_job; /* ignore string rasters */
1531: if ( height > 1023 ) goto end_of_job; /* don't try to squash huge image */
1532: if ( sp2->type == blanksignal ) /*blanksignal was propagated to us*/
1533: goto end_of_job; /* don't squash intentional blank */
1534: /* --- init firstcol1[], firstcol2[] --- */
1535: for ( irow1=0; irow1<height; irow1++ ) /* for each row */
1536: firstcol1[irow1] = firstcol2[irow1] = blanksignal; /* signal empty rows */
1537: /* --- set firstcol2[] indicating left edge of sp2 --- */
1538: for ( irow2=top2; irow2<=bot2; irow2++ ) /* for each row inside sp2 */
1539: for ( icol=0; icol<width2; icol++ ) /* find first non-empty col in row */
1540: if ( getpixel(sp2->image,irow2-top2,icol) != 0 ) /* found a set pixel */
1541: { firstcol2[irow2] = icol; /* icol is #cols from left edge */
1542: nfirst2++; /* bump #rows containing set pixels*/
1543: break; } /* and go on to next row */
1544: if ( nfirst2 < 1 ) /*right-hand sp2 is completely blank*/
1545: { nsquash = blanksignal; /* signal intentional blanks */
1546: goto end_of_job; } /* don't squash intentional blanks */
1547: /* --- now check if preceding image in sp1 was an intentional blank --- */
1548: if ( sp1->type == blanksignal ) /*blanksignal was propagated to us*/
1549: goto end_of_job; /* don't squash intentional blank */
1550: /* --- set firstcol1[] indicating right edge of sp1 --- */
1551: for ( irow1=top1; irow1<=bot1; irow1++ ) /* for each row inside sp1 */
1552: for ( icol=width1-1; icol>=0; icol-- ) /* find last non-empty col in row */
1553: if ( getpixel(sp1->image,irow1-top1,icol) != 0 ) /* found a set pixel */
1554: { firstcol1[irow1] = (width1-1)-icol; /* save #cols from right edge */
1555: nfirst1++; /* bump #rows containing set pixels*/
1556: break; } /* and go on to next row */
1557: if ( nfirst1 < 1 ) /*left-hand sp1 is completely blank*/
1558: goto end_of_job; /* don't squash intentional blanks */
1559: /* -------------------------------------------------------------------------
1560: find minimum separation
1561: -------------------------------------------------------------------------- */
1562: for ( irow2=top2; irow2<=bot2; irow2++ ) { /* check each row inside sp2 */
1563: int margin1, margin2=firstcol2[irow2]; /* #cols to first set pixel */
1564: if ( margin2 != blanksignal ) /* irow2 not an empty/blank row */
1565: for ( irow1=max2(irow2-smin,top1); ; irow1++ )
1566: if ( irow1 > min2(irow2+smin,bot1) ) break; /* upper bound check */
1567: else
1568: if ( (margin1=firstcol1[irow1]) != blanksignal ) { /*have non-blank row*/
1569: int dx=(margin1+margin2), dy=absval(irow2-irow1), ds=dx+dy; /* deltas */
1570: if ( ds >= smin ) continue; /* min unchanged */
1571: if ( dy>squashmargin && dx<xmin && smin<9999 ) continue; /* dy alone */
1572: smin=ds; xmin=dx; ymin=dy; /* set new min */
1573: } /* --- end-of-if(margin1!=blanksignal) --- */
1574: if ( smin<2 ) goto end_of_job; /* can't squash */
1575: } /* --- end-of-for(irow2) --- */
1576: /*nsquash = min2(xmin,width2);*/ /* permissible squash */
1577: nsquash = xmin; /* permissible squash */
1578: /* -------------------------------------------------------------------------
1579: Back to caller with #pixels to squash sp1||sp2
1580: -------------------------------------------------------------------------- */
1581: end_of_job:
1582: /* --- debugging output --- */
1583: if ( msgfp!=NULL && msglevel >= 99 ) /* display for debugging */
1584: { fprintf(msgfp,"rastsquash> nsquash=%d, squashmargin=%d\n",
1585: nsquash,squashmargin);
1586: if ( msglevel >= 999 ) /* also display rasters */
1587: { fprintf(msgfp,"rastsquash>left-hand image...\n");
1588: if(sp1!=NULL) type_raster(sp1->image,msgfp); /* left image */
1589: fprintf(msgfp,"rastsquash>right-hand image...\n");
1590: if(sp2!=NULL) type_raster(sp2->image,msgfp); } /* right image */
1591: fflush(msgfp); }
1592: return ( nsquash ); /* back with #squash pixels */
1593: } /* --- end-of-function rastsquash() --- */
1594:
1595:
1596: /* ==========================================================================
1597: * Function: accent_subraster ( accent, width, height, pixsz )
1598: * Purpose: Allocate a new subraster of width x height
1599: * (or maybe different dimensions, depending on accent),
1600: * and draw an accent (\hat or \vec or \etc) that fills it
1601: * --------------------------------------------------------------------------
1602: * Arguments: accent (I) int containing either HATACCENT or VECACCENT,
1603: * etc, indicating the type of accent desired
1604: * width (I) int containing desired width of accent (#cols)
1605: * height (I) int containing desired height of accent(#rows)
1606: * pixsz (I) int containing 1 for bitmap, 8 for bytemap
1607: * --------------------------------------------------------------------------
1608: * Returns: ( subraster * ) ptr to newly-allocated subraster with accent,
1609: * or NULL for any error.
1610: * --------------------------------------------------------------------------
1611: * Notes: o Some accents have internally-determined dimensions,
1612: * and caller should check dimensions in returned subraster
1613: * ======================================================================= */
1614: /* --- entry point --- */
1615: subraster *accent_subraster ( int accent, int width, int height, int pixsz )
1616: {
1617: /* -------------------------------------------------------------------------
1618: Allocations and Declarations
1619: -------------------------------------------------------------------------- */
1620: /* --- general info --- */
1621: raster *new_raster(), *rp=NULL; /*raster containing desired accent*/
1622: subraster *new_subraster(), *sp=NULL; /* subraster returning accent */
1623: int delete_raster(), delete_subraster(); /*free allocated raster on err*/
1624: int line_raster(), /* draws lines */
1625: thickness = 1; /* line thickness */
1626: /*int pixval = (pixsz==1? 1 : (pixsz==8?255:(-1)));*/ /*black pixel value*/
1627: /* --- other working info --- */
1628: int col0, col1, /* cols for line */
1629: row0, row1; /* rows for line */
1630: subraster *get_delim(), *accsp=NULL; /*find suitable cmex10 symbol/accent*/
1631: /* --- info for under/overbraces, tildes, etc --- */
1632: char brace[16]; /*"{" for over, "}" for under, etc*/
1633: raster *rastrot(), /* rotate { for overbrace, etc */
1634: *rastcpy(); /* may need copy of original */
1635: subraster *arrow_subraster(); /* rightarrow for vec */
1636: subraster *rastack(); /* stack accent atop extra space */
1637: /* -------------------------------------------------------------------------
1638: outer switch() traps accents that may change caller's height,width
1639: -------------------------------------------------------------------------- */
1640: switch ( accent )
1641: {
1642: default:
1643: /* -----------------------------------------------------------------------
1644: inner switch() first allocates fixed-size raster for accents that don't
1645: ------------------------------------------------------------------------ */
1646: if ( (rp = new_raster(width,height,pixsz)) /* allocate fixed-size raster */
1647: != NULL ) /* and if we succeeded... */
1648: switch ( accent ) /* ...draw requested accent in it */
1649: {
1650: /* --- unrecognized request --- */
1651: default: delete_raster(rp); /* unrecognized accent requested */
1652: rp = NULL; break; /* so free raster and signal error */
1653: /* --- bar request --- */
1654: case UNDERBARACCENT:
1655: case BARACCENT:
1656: thickness = height-1; /* adjust thickness */
1657: if ( accent == BARACCENT ) /* bar is above expression */
1658: line_raster(rp,0,0,0,width-1,thickness); /*leave blank line at bot*/
1659: else /* underbar is below expression */
1660: line_raster(rp,1,0,1,width-1,thickness); /*leave blank line at top*/
1661: break;
1662: /* --- dot request --- */
1663: case DOTACCENT:
1664: thickness = height-1; /* adjust thickness */
1665: line_raster(rp,0,width/2,1,(width/2)+1,thickness); /* centered dot */
1666: break;
1667: /* --- ddot request --- */
1668: case DDOTACCENT:
1669: thickness = height-1; /* adjust thickness */
1670: col0 = max2(width/3-(thickness-1),0); /* one-third of width */
1671: col1 = min2((2*width)/3+(thickness-1),width-thickness); /*two thirds*/
1672: line_raster(rp,0,col0,1,col0+1,thickness); /* set a dot at 1st third*/
1673: line_raster(rp,0,col1,1,col1+1,thickness); /* and another at 2nd */
1674: break;
1675: /* --- hat request --- */
1676: case HATACCENT:
1677: thickness = (width<=12? 2 : 3); /* adjust thickness */
1678: line_raster(rp,height-1,0,0,width/2,thickness); /* / part of hat*/
1679: line_raster(rp,0,(width-1)/2,height-1,width-1,thickness); /* \ part*/
1680: break;
1681: /* --- sqrt request --- */
1682: case SQRTACCENT:
1683: col1 = SQRTWIDTH(height) - 1; /* right col of sqrt symbol */
1684: col0 = (col1+2)/3; /* midpoint col of sqrt */
1685: row0 = (height+1)/2; /* midpoint row of sqrt */
1686: row1 = height-1; /* bottom row of sqrt */
1687: line_raster(rp,row0,0,row1,col0,thickness); /* descending portion */
1688: line_raster(rp,row1,col0,0,col1,thickness); /* ascending portion */
1689: line_raster(rp,0,col1,0,width-1,thickness); /*overbar of thickness 1*/
1690: break;
1691: } /* --- end-of-inner-switch(accent) --- */
1692: break; /* break from outer accent switch */
1693: /* --- underbrace, overbrace request --- */
1694: case UNDERBRACE:
1695: case OVERBRACE:
1696: if ( accent == UNDERBRACE ) strcpy(brace,"}"); /* start with } brace */
1697: if ( accent == OVERBRACE ) strcpy(brace,"{"); /* start with { brace */
1698: if ( (accsp=get_delim(brace,width,CMEX10)) /* use width for height */
1699: != NULL ) /* found desired brace */
1700: { rp = rastrot(accsp->image); /* rotate 90 degrees clockwise */
1701: delete_subraster(accsp); } /* and free subraster "envelope" */
1702: break;
1703: /* --- hat request --- */
1704: case HATACCENT:
1705: if ( accent == HATACCENT ) strcpy(brace,"<"); /* start with < */
1706: if ( (accsp=get_delim(brace,width,CMEX10)) /* use width for height */
1707: != NULL ) /* found desired brace */
1708: { rp = rastrot(accsp->image); /* rotate 90 degrees clockwise */
1709: delete_subraster(accsp); } /* and free subraster "envelope" */
1710: break;
1711: /* --- vec request --- */
1712: case VECACCENT:
1713: height = 2*(height/2) + 1; /* force height odd */
1714: if ( (accsp=arrow_subraster(width,height,pixsz,1,0)) /*build rightarrow*/
1715: != NULL ) /* succeeded */
1716: { rp = accsp->image; /* "extract" raster with bitmap */
1717: free((void *)accsp); } /* and free subraster "envelope" */
1718: break;
1719: /* --- tilde request --- */
1720: case TILDEACCENT:
1721: accsp=(width<25? get_delim("\\sim",-width,CMSY10) :
1722: get_delim("~",-width,CMEX10)); /*width search for tilde*/
1723: if ( accsp != NULL ) /* found desired tilde */
1724: if ( (sp=rastack(new_subraster(1,1,pixsz),accsp,1,0,1,3))/*space below*/
1725: != NULL ) /* have tilde with space below it */
1726: { rp = sp->image; /* "extract" raster with bitmap */
1727: free((void *)sp); } /* and free subraster "envelope" */
1728: break;
1729: } /* --- end-of-outer-switch(accent) --- */
1730: /* -------------------------------------------------------------------------
1731: if we constructed accent raster okay, embed it in a subraster and return it
1732: -------------------------------------------------------------------------- */
1733: /* --- if all okay, allocate subraster to contain constructed raster --- */
1734: if ( rp != NULL ) /* accent raster constructed okay */
1735: if ( (sp=new_subraster(0,0,0)) /* allocate subraster "envelope" */
1736: == NULL ) /* and if we fail to allocate */
1737: delete_raster(rp); /* free now-unneeded raster */
1738: else /* subraster allocated okay */
1739: { /* --- init subraster parameters, embedding raster in it --- */
1740: sp->type = IMAGERASTER; /* constructed image */
1741: sp->image = rp; /* raster we just constructed */
1742: sp->size = (-1); /* can't set font size here */
1743: sp->baseline = 0; } /* can't set baseline here */
1744: /* --- return subraster containing desired accent to caller --- */
1745: return ( sp ); /* return accent or NULL to caller */
1746: } /* --- end-of-function accent_subraster() --- */
1747:
1748:
1749: /* ==========================================================================
1750: * Function: arrow_subraster ( width, height, pixsz, drctn, isBig )
1751: * Purpose: Allocate a raster/subraster and draw left/right arrow in it
1752: * --------------------------------------------------------------------------
1753: * Arguments: width (I) int containing number of cols for arrow
1754: * height (I) int containing number of rows for arrow
1755: * pixsz (I) int containing 1 for bitmap, 8 for bytemap
1756: * drctn (I) int containing +1 for right arrow,
1757: * or -1 for left, 0 for leftright
1758: * isBig (I) int containing 1/true for \Long arrows,
1759: * or false for \long arrows, i.e.,
1760: * true for ===> or false for --->.
1761: * --------------------------------------------------------------------------
1762: * Returns: ( subraster * ) ptr to constructed left/right arrow
1763: * or NULL for any error.
1764: * --------------------------------------------------------------------------
1765: * Notes: o
1766: * ======================================================================= */
1767: /* --- entry point --- */
1768: subraster *arrow_subraster ( int width, int height, int pixsz,
1769: int drctn, int isBig )
1770: {
1771: /* -------------------------------------------------------------------------
1772: Allocations and Declarations
1773: -------------------------------------------------------------------------- */
1774: subraster *new_subraster(), *arrowsp=NULL; /* allocate arrow subraster */
1775: int rule_raster(); /* draw arrow line */
1776: int irow, midrow=height/2; /* index, midrow is arrowhead apex */
1777: int icol, thickness=(height>15?2:1); /* arrowhead thickness and index */
1778: int pixval = (pixsz==1? 1 : (pixsz==8?255:(-1))); /* black pixel value */
1779: int ipix, /* raster pixmap[] index */
1780: npix = width*height; /* #pixels malloced in pixmap[] */
1781: /* -------------------------------------------------------------------------
1782: allocate raster/subraster and draw arrow line
1783: -------------------------------------------------------------------------- */
1784: if ( height < 3 ) { height=3; midrow=1; } /* set minimum height */
1785: if ( (arrowsp=new_subraster(width,height,pixsz)) /* allocate empty raster */
1786: == NULL ) goto end_of_job; /* and quit if failed */
1787: if ( !isBig ) /* single line */
1788: rule_raster(arrowsp->image,midrow,0,width,1,0); /*draw line across midrow*/
1789: else
1790: { int delta = (width>6? (height>15? 3: (height>7? 2 : 1)) : 1);
1791: rule_raster(arrowsp->image,midrow-delta,delta,width-2*delta,1,0);
1792: rule_raster(arrowsp->image,midrow+delta,delta,width-2*delta,1,0); }
1793: /* -------------------------------------------------------------------------
1794: construct arrowhead(s)
1795: -------------------------------------------------------------------------- */
1796: for ( irow=0; irow<height; irow++ ) /* for each row of arrow */
1797: {
1798: int delta = abs(irow-midrow); /*arrowhead offset for irow*/
1799: /* --- right arrowhead --- */
1800: if ( drctn >= 0 ) /* right arrowhead wanted */
1801: for ( icol=0; icol<thickness; icol++ ) /* for arrowhead thickness */
1802: { ipix = ((irow+1)*width - 1) - delta - icol; /* rightmost-delta-icol */
1803: if ( ipix >= 0 ) /* bounds check */
1804: if ( pixsz == 1 ) /* have a bitmap */
1805: setlongbit((arrowsp->image)->pixmap,ipix);/*turn on arrowhead bit*/
1806: else /* should have a bytemap */
1807: if ( pixsz == 8 ) /* check pixsz for bytemap */
1808: ((arrowsp->image)->pixmap)[ipix] = pixval; } /*set arrowhead byte*/
1809: /* --- left arrowhead (same as right except for ipix calculation) --- */
1810: if ( drctn <= 0 ) /* left arrowhead wanted */
1811: for ( icol=0; icol<thickness; icol++ ) /* for arrowhead thickness */
1812: { ipix = irow*width + delta + icol; /* leftmost bit+delta+icol */
1813: if ( ipix < npix ) /* bounds check */
1814: if ( pixsz == 1 ) /* have a bitmap */
1815: setlongbit((arrowsp->image)->pixmap,ipix);/*turn on arrowhead bit*/
1816: else /* should have a bytemap */
1817: if ( pixsz == 8 ) /* check pixsz for bytemap */
1818: ((arrowsp->image)->pixmap)[ipix] = pixval; } /*set arrowhead byte*/
1819: } /* --- end-of-for(irow) --- */
1820: end_of_job:
1821: return ( arrowsp ); /*back to caller with arrow or NULL*/
1822: } /* --- end-of-function arrow_subraster() --- */
1823:
1824:
1825: /* ==========================================================================
1826: * Function: uparrow_subraster ( width, height, pixsz, drctn, isBig )
1827: * Purpose: Allocate a raster/subraster and draw up/down arrow in it
1828: * --------------------------------------------------------------------------
1829: * Arguments: width (I) int containing number of cols for arrow
1830: * height (I) int containing number of rows for arrow
1831: * pixsz (I) int containing 1 for bitmap, 8 for bytemap
1832: * drctn (I) int containing +1 for up arrow,
1833: * or -1 for down, or 0 for updown
1834: * isBig (I) int containing 1/true for \Long arrows,
1835: * or false for \long arrows, i.e.,
1836: * true for ===> or false for --->.
1837: * --------------------------------------------------------------------------
1838: * Returns: ( subraster * ) ptr to constructed up/down arrow
1839: * or NULL for any error.
1840: * --------------------------------------------------------------------------
1841: * Notes: o
1842: * ======================================================================= */
1843: /* --- entry point --- */
1844: subraster *uparrow_subraster ( int width, int height, int pixsz,
1845: int drctn, int isBig )
1846: {
1847: /* -------------------------------------------------------------------------
1848: Allocations and Declarations
1849: -------------------------------------------------------------------------- */
1850: subraster *new_subraster(), *arrowsp=NULL; /* allocate arrow subraster */
1851: int rule_raster(); /* draw arrow line */
1852: int icol, midcol=width/2; /* index, midcol is arrowhead apex */
1853: int irow, thickness=(width>15?2:1); /* arrowhead thickness and index */
1854: int pixval = (pixsz==1? 1 : (pixsz==8?255:(-1))); /* black pixel value */
1855: int ipix, /* raster pixmap[] index */
1856: npix = width*height; /* #pixels malloced in pixmap[] */
1857: /* -------------------------------------------------------------------------
1858: allocate raster/subraster and draw arrow line
1859: -------------------------------------------------------------------------- */
1860: if ( width < 3 ) { width=3; midcol=1; } /* set minimum width */
1861: if ( (arrowsp=new_subraster(width,height,pixsz)) /* allocate empty raster */
1862: == NULL ) goto end_of_job; /* and quit if failed */
1863: if ( !isBig ) /* single line */
1864: rule_raster(arrowsp->image,0,midcol,1,height,0); /*draw line down midcol*/
1865: else
1866: { int delta = (height>6? (width>15? 3: (width>7? 2 : 1)) : 1);
1867: rule_raster(arrowsp->image,delta,midcol-delta,1,height-2*delta,0);
1868: rule_raster(arrowsp->image,delta,midcol+delta,1,height-2*delta,0); }
1869: /* -------------------------------------------------------------------------
1870: construct arrowhead(s)
1871: -------------------------------------------------------------------------- */
1872: for ( icol=0; icol<width; icol++ ) /* for each col of arrow */
1873: {
1874: int delta = abs(icol-midcol); /*arrowhead offset for icol*/
1875: /* --- up arrowhead --- */
1876: if ( drctn >= 0 ) /* up arrowhead wanted */
1877: for ( irow=0; irow<thickness; irow++ ) /* for arrowhead thickness */
1878: { ipix = (irow+delta)*width + icol; /* leftmost+icol */
1879: if ( ipix < npix ) /* bounds check */
1880: if ( pixsz == 1 ) /* have a bitmap */
1881: setlongbit((arrowsp->image)->pixmap,ipix);/*turn on arrowhead bit*/
1882: else /* should have a bytemap */
1883: if ( pixsz == 8 ) /* check pixsz for bytemap */
1884: ((arrowsp->image)->pixmap)[ipix] = pixval; } /*set arrowhead byte*/
1885: /* --- down arrowhead (same as up except for ipix calculation) --- */
1886: if ( drctn <= 0 ) /* down arrowhead wanted */
1887: for ( irow=0; irow<thickness; irow++ ) /* for arrowhead thickness */
1888: { ipix = (height-1-delta-irow)*width + icol; /* leftmost + icol */
1889: if ( ipix > 0 ) /* bounds check */
1890: if ( pixsz == 1 ) /* have a bitmap */
1891: setlongbit((arrowsp->image)->pixmap,ipix);/*turn on arrowhead bit*/
1892: else /* should have a bytemap */
1893: if ( pixsz == 8 ) /* check pixsz for bytemap */
1894: ((arrowsp->image)->pixmap)[ipix] = pixval; } /*set arrowhead byte*/
1895: } /* --- end-of-for(irow) --- */
1896: end_of_job:
1897: return ( arrowsp ); /*back to caller with arrow or NULL*/
1898: } /* --- end-of-function uparrow_subraster() --- */
1899:
1900:
1901: /* ==========================================================================
1902: * Function: rule_raster ( rp, top, left, width, height, type )
1903: * Purpose: Draw a solid or dashed line (or box) in existing raster rp,
1904: * starting at top,left with dimensions width,height.
1905: * --------------------------------------------------------------------------
1906: * Arguments: rp (I) raster * to raster in which rule
1907: * will be drawn
1908: * top (I) int containing row at which top-left corner
1909: * of rule starts (0 is topmost)
1910: * left (I) int containing col at which top-left corner
1911: * of rule starts (0 is leftmost)
1912: * width (I) int containing number of cols for rule
1913: * height (I) int containing number of rows for rule
1914: * type (I) int containing 0 for solid rule,
1915: * 1 for horizontal dashes, 2 for vertical
1916: * --------------------------------------------------------------------------
1917: * Returns: ( int ) 1 if rule drawn okay,
1918: * or 0 for any error.
1919: * --------------------------------------------------------------------------
1920: * Notes: o Rule line is implicitly "horizontal" or "vertical" depending
1921: * on relative width,height dimensions. It's a box if they're
1922: * more or less comparable.
1923: * ======================================================================= */
1924: /* --- entry point --- */
1925: int rule_raster ( raster *rp, int top, int left,
1926: int width, int height, int type )
1927: {
1928: /* -------------------------------------------------------------------------
1929: Allocations and Declarations
1930: -------------------------------------------------------------------------- */
1931: int irow, icol; /* indexes over rp raster */
1932: int ipix, /* raster pixmap[] index */
1933: npix = rp->width * rp->height; /* #pixels malloced in rp->pixmap[] */
1934: int isfatal = 0; /* true to abend on out-of-bounds error */
1935: int hdash=1, vdash=2; /* type for horizontal, vertical dashes */
1936: int dashlen=3, spacelen=2, /* #pixels for dash followed by space */
1937: isdraw=1; /* true when drawing dash (init for solid) */
1938: /* -------------------------------------------------------------------------
1939: Check args
1940: -------------------------------------------------------------------------- */
1941: if ( rp == (raster *)NULL ) /* no raster arg supplied */
1942: if ( workingbox != (subraster *)NULL ) /* see if we have a workingbox */
1943: rp = workingbox->image; /* use workingbox if possible */
1944: else return ( 0 ); /* otherwise signal error to caller */
1945: /* -------------------------------------------------------------------------
1946: Fill line/box
1947: -------------------------------------------------------------------------- */
1948: for ( irow=top; irow<top+height; irow++ ) /*each scan line*/
1949: {
1950: if ( type == vdash ) /*set isdraw for vert dash*/
1951: isdraw = (((irow-top)%(dashlen+spacelen)) < dashlen);
1952: ipix = irow*rp->width + left - 1; /*first pixel preceding icol*/
1953: for ( icol=left; icol<left+width; icol++ ) /* each pixel in scan line */
1954: {
1955: if ( type == hdash ) /*set isdraw for horiz dash*/
1956: isdraw = (((icol-left)%(dashlen+spacelen)) < dashlen);
1957: if ( ++ipix >= npix ) /* bounds check failed */
1958: if ( isfatal ) goto end_of_job; /* abort if error is fatal */
1959: else break; /*or just go on to next row*/
1960: else /*ibit is within rp bounds*/
1961: if ( isdraw ) /*and we're drawing this bit*/
1962: if ( rp->pixsz == 1 ) /* have a bitmap */
1963: setlongbit(rp->pixmap,ipix); /* so turn on bit in line */
1964: else /* should have a bytemap */
1965: if ( rp->pixsz == 8 ) /* check pixsz for bytemap */
1966: ((unsigned char *)(rp->pixmap))[ipix] = 255; /* set black byte */
1967: } /* --- end-of-for(icol) --- */
1968: } /* --- end-of-for(irow) --- */
1969: end_of_job:
1970: return ( isfatal? (ipix<npix? 1:0) : 1 );
1971: } /* --- end-of-function rule_raster() --- */
1972:
1973:
1974: /* ==========================================================================
1975: * Function: line_raster ( rp, row0, col0, row1, col1, thickness )
1976: * Purpose: Draw a line from row0,col0 to row1,col1 of thickness
1977: * in existing raster rp.
1978: * --------------------------------------------------------------------------
1979: * Arguments: rp (I) raster * to raster in which a line
1980: * will be drawn
1981: * row0 (I) int containing row at which
1982: * line will start (0 is topmost)
1983: * col0 (I) int containing col at which
1984: * line will start (0 is leftmost)
1985: * row1 (I) int containing row at which
1986: * line will end (rp->height-1 is bottom-most)
1987: * col1 (I) int containing col at which
1988: * line will end (rp->width-1 is rightmost)
1989: * thickness (I) int containing number of pixels/bits
1990: * thick the line will be
1991: * --------------------------------------------------------------------------
1992: * Returns: ( int ) 1 if line drawn okay,
1993: * or 0 for any error.
1994: * --------------------------------------------------------------------------
1995: * Notes: o if row0==row1, a horizontal line is drawn
1996: * between col0 and col1, with row0(==row1) the top row
1997: * and row0+(thickness-1) the bottom row
1998: * o if col0==col1, a vertical bar is drawn
1999: * between row0 and row1, with col0(==col1) the left col
2000: * and col0+(thickness-1) the right col
2001: * o if both the above, you get a square thickness x thickness
2002: * whose top-left corner is row0,col0.
2003: * ======================================================================= */
2004: /* --- entry point --- */
2005: int line_raster ( raster *rp, int row0, int col0,
2006: int row1, int col1, int thickness )
2007: {
2008: /* -------------------------------------------------------------------------
2009: Allocations and Declarations
2010: -------------------------------------------------------------------------- */
2011: int irow, icol, /* indexes over rp raster */
2012: locol=col0, hicol=col1, /* col limits at irow */
2013: lorow=row0, hirow=row1; /* row limits at icol */
2014: int ipix, /* raster pixmap[] index */
2015: npix = rp->width * rp->height; /* #pixels malloced in rp->pixmap[] */
2016: int isfatal = 0; /* true to abend on out-of-bounds error */
2017: int isline=(row1==row0), isbar=(col1==col0); /*true if slope a=0,\infty*/
2018: double dy = row1-row0 /* + (row1>=row0? +1.0 : -1.0) */, /* delta-x */
2019: dx = col1-col0 /* + (col1>=col0? +1.0 : -1.0) */, /* delta-y */
2020: a= (isbar||isline? 0.0 : dy/dx), /* slope = tan(theta) = dy/dx */
2021: xcol, xrow; /* calculated col at irow, or row at icol */
2022: double ar = ASPECTRATIO, /* aspect ratio width/height of one pixel */
2023: xwidth= (isline? 0.0 : /*#pixels per row to get sloped line thcknss*/
2024: ((double)thickness)*sqrt((dx*dx)+(dy*dy*ar*ar))/fabs(dy*ar)),
2025: xheight = 1.0;
2026: int line_recurse(), isrecurse=1; /* true to draw line recursively */
2027: /* -------------------------------------------------------------------------
2028: Check args
2029: -------------------------------------------------------------------------- */
2030: if ( rp == (raster *)NULL ) /* no raster arg supplied */
2031: if ( workingbox != (subraster *)NULL ) /* see if we have a workingbox */
2032: rp = workingbox->image; /* use workingbox if possible */
2033: else return ( 0 ); /* otherwise signal error to caller */
2034: /* -------------------------------------------------------------------------
2035: Initialization
2036: -------------------------------------------------------------------------- */
2037: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
2038: fprintf(msgfp,"line_raster> row,col0=%d,%d row,col1=%d,%d, thickness=%d\n"
2039: "\t dy,dx=%3.1f,%3.1f, a=%4.3f, xwidth=%4.3f\n",
2040: row0,col0, row1,col1, thickness, dy,dx, a, xwidth);
2041: /* --- check for recursive line drawing --- */
2042: if ( isrecurse ) /* drawing lines recursively */
2043: { line_recurse(rp,(double)row0,(double)col0,
2044: (double)row1,(double)col1,thickness);
2045: return ( 1 ); }
2046: /* --- set params for horizontal line or vertical bar --- */
2047: if ( isline ) /*interpret row as top row*/
2048: row1 = row0 + (thickness-1); /* set bottom row for line */
2049: if ( 0&&isbar ) /*interpret col as left col*/
2050: hicol = col0 + (thickness-1); /* set right col for bar */
2051: /* -------------------------------------------------------------------------
2052: draw line one row at a time
2053: -------------------------------------------------------------------------- */
2054: for ( irow=min2(row0,row1); irow<=max2(row0,row1); irow++ ) /*each scan line*/
2055: {
2056: if ( !isbar && !isline ) /* neither vert nor horiz */
2057: { xcol = col0 + ((double)(irow-row0))/a; /* "middle" col in irow */
2058: locol = max2((int)(xcol-0.5*(xwidth-1.0)),0); /* leftmost col */
2059: hicol = min2((int)(xcol+0.5*(xwidth-0.0)),max2(col0,col1)); } /*right*/
2060: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
2061: fprintf(msgfp,"\t irow=%d, xcol=%4.2f, lo,hicol=%d,%d\n",
2062: irow,xcol,locol,hicol);
2063: ipix = irow*rp->width + min2(locol,hicol) - 1; /*first pix preceding icol*/
2064: for ( icol=min2(locol,hicol); icol<=max2(locol,hicol); icol++ ) /*each pix*/
2065: if ( ++ipix >= npix ) /* bounds check failed */
2066: if ( isfatal ) goto end_of_job; /* abort if error is fatal */
2067: else break; /*or just go on to next row*/
2068: else /* turn on pixel in line */
2069: if ( rp->pixsz == 1 ) /* have a pixel bitmap */
2070: setlongbit(rp->pixmap,ipix); /* so turn on bit in line */
2071: else /* should have a bytemap */
2072: if ( rp->pixsz == 8 ) /* check pixsz for bytemap */
2073: ((unsigned char *)(rp->pixmap))[ipix] = 255; /* set black byte */
2074: } /* --- end-of-for(irow) --- */
2075: /* -------------------------------------------------------------------------
2076: now _redraw_ line one col at a time to avoid "gaps"
2077: -------------------------------------------------------------------------- */
2078: if ( 1 )
2079: for ( icol=min2(col0,col1); icol<=max2(col0,col1); icol++ )/*each scan line*/
2080: {
2081: if ( !isbar && !isline ) /* neither vert nor horiz */
2082: { xrow = row0 + ((double)(icol-col0))*a; /* "middle" row in icol */
2083: lorow = max2((int)(xrow-0.5*(xheight-1.0)),0); /* topmost row */
2084: hirow = min2((int)(xrow+0.5*(xheight-0.0)),max2(row0,row1)); } /*bot*/
2085: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
2086: fprintf(msgfp,"\t icol=%d, xrow=%4.2f, lo,hirow=%d,%d\n",
2087: icol,xrow,lorow,hirow);
2088: ipix = irow*rp->width + min2(locol,hicol) - 1; /*first pix preceding icol*/
2089: for ( irow=min2(lorow,hirow); irow<=max2(lorow,hirow); irow++ ) /*each pix*/
2090: if ( irow<0 || irow>=rp->height
2091: || icol<0 || icol>=rp->width ) /* bounds check */
2092: if ( isfatal ) goto end_of_job; /* abort if error is fatal */
2093: else continue; /*or just go on to next row*/
2094: else
2095: setpixel(rp,irow,icol,255); /* set pixel at irow,icol */
2096: } /* --- end-of-for(irow) --- */
2097: /* -------------------------------------------------------------------------
2098: Back to caller with 1=okay, 0=failed.
2099: -------------------------------------------------------------------------- */
2100: end_of_job:
2101: return ( isfatal? (ipix<npix? 1:0) : 1 );
2102: } /* --- end-of-function line_raster() --- */
2103:
2104:
2105: /* ==========================================================================
2106: * Function: line_recurse ( rp, row0, col0, row1, col1, thickness )
2107: * Purpose: Draw a line from row0,col0 to row1,col1 of thickness
2108: * in existing raster rp.
2109: * --------------------------------------------------------------------------
2110: * Arguments: rp (I) raster * to raster in which a line
2111: * will be drawn
2112: * row0 (I) double containing row at which
2113: * line will start (0 is topmost)
2114: * col0 (I) double containing col at which
2115: * line will start (0 is leftmost)
2116: * row1 (I) double containing row at which
2117: * line will end (rp->height-1 is bottom-most)
2118: * col1 (I) double containing col at which
2119: * line will end (rp->width-1 is rightmost)
2120: * thickness (I) int containing number of pixels/bits
2121: * thick the line will be
2122: * --------------------------------------------------------------------------
2123: * Returns: ( int ) 1 if line drawn okay,
2124: * or 0 for any error.
2125: * --------------------------------------------------------------------------
2126: * Notes: o Recurses, drawing left- and right-halves of line
2127: * until a horizontal or vertical segment is found
2128: * ======================================================================= */
2129: /* --- entry point --- */
2130: int line_recurse ( raster *rp, double row0, double col0,
2131: double row1, double col1, int thickness )
2132: {
2133: /* -------------------------------------------------------------------------
2134: Allocations and Declarations
2135: -------------------------------------------------------------------------- */
2136: double delrow = fabs(row1-row0), /* 0 if line horizontal */
2137: delcol = fabs(col1-col0), /* 0 if line vertical */
2138: tolerance = 0.5; /* draw line when it goes to point */
2139: double midrow = 0.5*(row0+row1), /* midpoint row */
2140: midcol = 0.5*(col0+col1); /* midpoint col */
2141: /* -------------------------------------------------------------------------
2142: recurse if either delta > tolerance
2143: -------------------------------------------------------------------------- */
2144: if ( delrow > tolerance /* row hasn't converged */
2145: || delcol > tolerance ) /* col hasn't converged */
2146: { line_recurse(rp,row0,col0,midrow,midcol,thickness); /* left half */
2147: line_recurse(rp,midrow,midcol,row1,col1,thickness); /* right half */
2148: return ( 1 ); }
2149: /* -------------------------------------------------------------------------
2150: draw converged point
2151: -------------------------------------------------------------------------- */
2152: setpixel(rp,iround(midrow),iround(midcol),255); /*set pixel at midrow,midcol*/
2153: return ( 1 );
2154: } /* --- end-of-function line_recurse() --- */
2155:
2156:
2157: /* ==========================================================================
2158: * Function: circle_raster ( rp, row0, col0, row1, col1,
2159: * thickness, quads )
2160: * Purpose: Draw quad(rant)s of an ellipse in box determined by
2161: * diagonally opposite corner points (row0,col0) and
2162: * (row1,col1), of thickness pixels in existing raster rp.
2163: * --------------------------------------------------------------------------
2164: * Arguments: rp (I) raster * to raster in which an ellipse
2165: * will be drawn
2166: * row0 (I) int containing 1st corner row bounding ellipse
2167: * (0 is topmost)
2168: * col0 (I) int containing 1st corner col bounding ellipse
2169: * (0 is leftmost)
2170: * row1 (I) int containing 2nd corner row bounding ellipse
2171: * (rp->height-1 is bottom-most)
2172: * col1 (I) int containing 2nd corner col bounding ellipse
2173: * (rp->width-1 is rightmost)
2174: * thickness (I) int containing number of pixels/bits
2175: * thick the ellipse arc line will be
2176: * quads (I) char * to null-terminated string containing
2177: * any subset/combination of "1234" specifying
2178: * which quadrant(s) of ellipse to draw.
2179: * NULL ptr draws all four quadrants;
2180: * otherwise 1=upper-right quadrant,
2181: * 2=uper-left, 3=lower-left, 4=lower-right,
2182: * i.e., counterclockwise from 1=positive quad.
2183: * --------------------------------------------------------------------------
2184: * Returns: ( int ) 1 if ellipse drawn okay,
2185: * or 0 for any error.
2186: * --------------------------------------------------------------------------
2187: * Notes: o row0==row1 or col0==col1 are errors
2188: * o using ellipse equation x^2/a^2 + y^2/b^2 = 1
2189: * ======================================================================= */
2190: /* --- entry point --- */
2191: int circle_raster ( raster *rp, int row0, int col0,
2192: int row1, int col1, int thickness, char *quads )
2193: {
2194: /* -------------------------------------------------------------------------
2195: Allocations and Declarations
2196: -------------------------------------------------------------------------- */
2197: /* --- lower-left and upper-right bounding points (in our coords) --- */
2198: int lorow = min2(row0,row1), /* lower bounding row (top of box) */
2199: locol = min2(col0,col1), /* lower bounding col (left of box)*/
2200: hirow = max2(row0,row1), /* upper bounding row (bot of box) */
2201: hicol = max2(col0,col1); /* upper bounding col (right of box)*/
2202: /* --- a and b ellipse params --- */
2203: int width = hicol-locol+1, /* width of bounding box */
2204: height= hirow-lorow+1, /* height of bounding box */
2205: islandscape = (width>=height? 1:0); /*true if ellipse lying on side*/
2206: double a = ((double)width)/2.0, /* x=a when y=0 */
2207: b = ((double)height)/2.0, /* y=b when x=0 */
2208: abmajor = (islandscape? a : b), /* max2(a,b) */
2209: abminor = (islandscape? b : a), /* min2(a,b) */
2210: abmajor2 = abmajor*abmajor, /* abmajor^2 */
2211: abminor2 = abminor*abminor; /* abminor^2 */
2212: /* --- other stuff --- */
2213: int imajor=0, nmajor=max2(width,height), /*index, #pixels on major axis*/
2214: iminor=0, nminor=min2(width,height); /* solved index on minor axis */
2215: int irow, icol, /* raster indexes at circumference */
2216: rsign=1, csign=1; /* row,col signs, both +1 in quad 1*/
2217: double midrow= ((double)(row0+row1))/2.0, /* center row */
2218: midcol= ((double)(col0+col1))/2.0; /* center col */
2219: double xy, xy2, /* major axis ellipse coord */
2220: yx2, yx; /* solved minor ellipse coord */
2221: int isokay = 1; /* true if no pixels out-of-bounds */
2222: char *qptr=NULL, *allquads="1234"; /* quadrants if input quads==NULL */
2223: int circle_recurse(), isrecurse=1; /* true to draw ellipse recursively*/
2224: /* -------------------------------------------------------------------------
2225: pixel-by-pixel along positive major axis, quit when it goes negative
2226: -------------------------------------------------------------------------- */
2227: if ( quads == NULL ) quads = allquads; /* draw all quads, or only user's */
2228: if ( msgfp!=NULL && msglevel>=39 ) /* debugging */
2229: fprintf(msgfp,"circle_raster> width,height;quads=%d,%d,%s\n",
2230: width,height,quads);
2231: if ( nmajor < 1 ) isokay = 0; /* problem with input args */
2232: else
2233: {
2234: if ( isrecurse ) /* use recursive algorithm */
2235: {
2236: for ( qptr=quads; *qptr!='\000'; qptr++ ) /* for each character in quads */
2237: {
2238: double theta0=0.0, theta1=0.0; /* set thetas based on quadrant */
2239: switch ( *qptr ) /* check for quadrant 1,2,3,4 */
2240: { default: /* unrecognized, assume quadrant 1 */
2241: case '1': theta0= 0.0; theta1= 90.0; break; /* first quadrant */
2242: case '2': theta0= 90.0; theta1=180.0; break; /* second quadrant */
2243: case '3': theta0=180.0; theta1=270.0; break; /* third quadrant */
2244: case '4': theta0=270.0; theta1=360.0; break; } /* fourth quadrant */
2245: circle_recurse(rp,row0,col0,row1,col1,thickness,theta0,theta1);
2246: } /* --- end-of-for(qptr) --- */
2247: return ( 1 );
2248: } /* --- end-of-if(isrecurse) --- */
2249: for ( imajor=(nmajor+1)/2; ; imajor-- )
2250: {
2251: /* --- xy is coord along major axis, yx is "solved" along minor axis --- */
2252: xy = ((double)imajor); /* xy = abmajor ... 0 */
2253: if ( xy < 0.0 ) break; /* negative side symmetrical */
2254: yx2 = abminor2*(1.0 - xy*xy/abmajor2); /* "solve" ellipse equation */
2255: yx = (yx2>0.0? sqrt(yx2) : 0.0); /* take sqrt if possible */
2256: iminor = iround(yx); /* nearest integer */
2257: /* --- set pixels for each requested quadrant --- */
2258: for ( qptr=quads; *qptr!='\000'; qptr++ ) /* for each character in quads */
2259: {
2260: rsign = (-1); csign = 1; /* init row,col in user quadrant 1 */
2261: switch ( *qptr ) /* check for quadrant 1,2,3,4 */
2262: { default: break; /* unrecognized, assume quadrant 1 */
2263: case '4': rsign = 1; break; /* row,col both pos in quadrant 4 */
2264: case '3': rsign = 1; /* row pos, col neg in quadrant 3 */
2265: case '2': csign = (-1); break; } /* row,col both neg in quadrant 2 */
2266: irow = iround(midrow + (double)rsign*(islandscape?yx:xy));
2267: irow = min2(hirow,max2(lorow,irow)); /* keep irow in bounds */
2268: icol = iround(midcol + (double)csign*(islandscape?xy:yx));
2269: icol = min2(hicol,max2(locol,icol)); /* keep icol in bounds */
2270: if ( msgfp!=NULL && msglevel>=49 ) /* debugging */
2271: fprintf(msgfp,"\t...imajor=%d; iminor,quad,irow,icol=%d,%c,%d,%d\n",
2272: imajor,iminor,*qptr,irow,icol);
2273: if ( irow<0 || irow>=rp->height /* row outside raster */
2274: || icol<0 || icol>=rp->width ) /* col outside raster */
2275: { isokay = 0; /* signal out-of-bounds pixel */
2276: continue; } /* but still try remaining points */
2277: setpixel(rp,irow,icol,255); /* set pixel at irow,icol */
2278: } /* --- end-of-for(qptr) --- */
2279: } /* --- end-of-for(imajor) --- */
2280: /* ------------------------------------------------------------------------
2281: now do it _again_ along minor axis to avoid "gaps"
2282: ------------------------------------------------------------------------- */
2283: if ( 1 && iminor>0 )
2284: for ( iminor=(nminor+1)/2; ; iminor-- )
2285: {
2286: /* --- yx is coord along minor axis, xy is "solved" along major axis --- */
2287: yx = ((double)iminor); /* yx = abminor ... 0 */
2288: if ( yx < 0.0 ) break; /* negative side symmetrical */
2289: xy2 = abmajor2*(1.0 - yx*yx/abminor2); /* "solve" ellipse equation */
2290: xy = (xy2>0.0? sqrt(xy2) : 0.0); /* take sqrt if possible */
2291: imajor = iround(xy); /* nearest integer */
2292: /* --- set pixels for each requested quadrant --- */
2293: for ( qptr=quads; *qptr!='\000'; qptr++ ) /* for each character in quads */
2294: {
2295: rsign = (-1); csign = 1; /* init row,col in user quadrant 1 */
2296: switch ( *qptr ) /* check for quadrant 1,2,3,4 */
2297: { default: break; /* unrecognized, assume quadrant 1 */
2298: case '4': rsign = 1; break; /* row,col both pos in quadrant 4 */
2299: case '3': rsign = 1; /* row pos, col neg in quadrant 3 */
2300: case '2': csign = (-1); break; } /* row,col both neg in quadrant 2 */
2301: irow = iround(midrow + (double)rsign*(islandscape?yx:xy));
2302: irow = min2(hirow,max2(lorow,irow)); /* keep irow in bounds */
2303: icol = iround(midcol + (double)csign*(islandscape?xy:yx));
2304: icol = min2(hicol,max2(locol,icol)); /* keep icol in bounds */
2305: if ( msgfp!=NULL && msglevel>=49 ) /* debugging */
2306: fprintf(msgfp,"\t...iminor=%d; imajor,quad,irow,icol=%d,%c,%d,%d\n",
2307: iminor,imajor,*qptr,irow,icol);
2308: if ( irow<0 || irow>=rp->height /* row outside raster */
2309: || icol<0 || icol>=rp->width ) /* col outside raster */
2310: { isokay = 0; /* signal out-of-bounds pixel */
2311: continue; } /* but still try remaining points */
2312: setpixel(rp,irow,icol,255); /* set pixel at irow,icol */
2313: } /* --- end-of-for(qptr) --- */
2314: } /* --- end-of-for(iminor) --- */
2315: } /* --- end-of-if/else(nmajor<1) --- */
2316: return ( isokay );
2317: } /* --- end-of-function circle_raster() --- */
2318:
2319:
2320: /* ==========================================================================
2321: * Function: circle_recurse ( rp, row0, col0, row1, col1,
2322: * thickness, theta0, theta1 )
2323: * Purpose: Recursively draws arc theta0<=theta<=theta1 of the ellipse
2324: * in box determined by diagonally opposite corner points
2325: * (row0,col0) and (row1,col1), of thickness pixels in raster rp.
2326: * --------------------------------------------------------------------------
2327: * Arguments: rp (I) raster * to raster in which an ellipse
2328: * will be drawn
2329: * row0 (I) int containing 1st corner row bounding ellipse
2330: * (0 is topmost)
2331: * col0 (I) int containing 1st corner col bounding ellipse
2332: * (0 is leftmost)
2333: * row1 (I) int containing 2nd corner row bounding ellipse
2334: * (rp->height-1 is bottom-most)
2335: * col1 (I) int containing 2nd corner col bounding ellipse
2336: * (rp->width-1 is rightmost)
2337: * thickness (I) int containing number of pixels/bits
2338: * thick the ellipse arc line will be
2339: * theta0 (I) double containing first angle -360 -> +360
2340: * theta1 (I) double containing second angle -360 -> +360
2341: * 0=x-axis, positive moving counterclockwise
2342: * --------------------------------------------------------------------------
2343: * Returns: ( int ) 1 if ellipse drawn okay,
2344: * or 0 for any error.
2345: * --------------------------------------------------------------------------
2346: * Notes: o row0==row1 or col0==col1 are errors
2347: * o using ellipse equation x^2/a^2 + y^2/b^2 = 1
2348: * Then, with x=r*cos(theta), y=r*sin(theta), ellipse
2349: * equation is r = ab/sqrt(a^2*sin^2(theta)+b^2*cos^2(theta))
2350: * ======================================================================= */
2351: /* --- entry point --- */
2352: int circle_recurse ( raster *rp, int row0, int col0,
2353: int row1, int col1, int thickness, double theta0, double theta1 )
2354: {
2355: /* -------------------------------------------------------------------------
2356: Allocations and Declarations
2357: -------------------------------------------------------------------------- */
2358: /* --- lower-left and upper-right bounding points (in our coords) --- */
2359: int lorow = min2(row0,row1), /* lower bounding row (top of box) */
2360: locol = min2(col0,col1), /* lower bounding col (left of box)*/
2361: hirow = max2(row0,row1), /* upper bounding row (bot of box) */
2362: hicol = max2(col0,col1); /* upper bounding col (right of box)*/
2363: /* --- a and b ellipse params --- */
2364: int width = hicol-locol+1, /* width of bounding box */
2365: height= hirow-lorow+1; /* height of bounding box */
2366: double a = ((double)width)/2.0, /* col x=a when row y=0 */
2367: b = ((double)height)/2.0, /* row y=b when col x=0 */
2368: ab=a*b, a2=a*a, b2=b*b; /* product and squares */
2369: /* --- arc parameters --- */
2370: double rads = 0.017453292, /* radians per degree = 1/57.29578 */
2371: lotheta = rads*dmod(min2(theta0,theta1),360), /* smaller angle */
2372: hitheta = rads*dmod(max2(theta0,theta1),360), /* larger angle */
2373: locos=cos(lotheta), losin=sin(lotheta), /* trigs for lotheta */
2374: hicos=cos(hitheta), hisin=sin(hitheta), /* trigs for hitheta */
2375: rlo = ab/sqrt(b2*locos*locos+a2*losin*losin), /* r for lotheta */
2376: rhi = ab/sqrt(b2*hicos*hicos+a2*hisin*hisin), /* r for hitheta */
2377: xlo=rlo*locos, ylo=rlo*losin, /*col,row pixel coords for lotheta*/
2378: xhi=rhi*hicos, yhi=rhi*hisin, /*col,row pixel coords for hitheta*/
2379: xdelta=fabs(xhi-xlo), ydelta=fabs(yhi-ylo), /* col,row deltas */
2380: tolerance = 0.5; /* convergence tolerance */
2381: /* -------------------------------------------------------------------------
2382: recurse if either delta > tolerance
2383: -------------------------------------------------------------------------- */
2384: if ( ydelta > tolerance /* row hasn't converged */
2385: || xdelta > tolerance ) /* col hasn't converged */
2386: { double midtheta = 0.5*(theta0+theta1); /* mid angle for arc */
2387: circle_recurse(rp,row0,col0,row1,col1,thickness,theta0,midtheta); /*lo*/
2388: circle_recurse(rp,row0,col0,row1,col1,thickness,midtheta,theta1); }/*hi*/
2389: /* -------------------------------------------------------------------------
2390: draw converged point
2391: -------------------------------------------------------------------------- */
2392: else
2393: { double xcol=0.5*(xlo+xhi), yrow=0.5*(ylo+yhi), /* relative to center*/
2394: centerrow = 0.5*((double)(lorow+hirow)), /* ellipse y-center */
2395: centercol = 0.5*((double)(locol+hicol)), /* ellipse x-center */
2396: midrow=centerrow-yrow, midcol=centercol+xcol; /* pixel coords */
2397: setpixel(rp,iround(midrow),iround(midcol),255); } /* set midrow,midcol */
2398: return ( 1 );
2399: } /* --- end-of-function circle_recurse() --- */
2400:
2401:
2402: /* ==========================================================================
2403: * Function: bezier_raster ( rp, r0,c0, r1,c1, rt,ct )
2404: * Purpose: Recursively draw bezier from r0,c0 to r1,c1
2405: * (with tangent point rt,ct) in existing raster rp.
2406: * --------------------------------------------------------------------------
2407: * Arguments: rp (I) raster * to raster in which a line
2408: * will be drawn
2409: * r0 (I) double containing row at which
2410: * bezier will start (0 is topmost)
2411: * c0 (I) double containing col at which
2412: * bezier will start (0 is leftmost)
2413: * r1 (I) double containing row at which
2414: * bezier will end (rp->height-1 is bottom-most)
2415: * c1 (I) double containing col at which
2416: * bezier will end (rp->width-1 is rightmost)
2417: * rt (I) double containing row for tangent point
2418: * ct (I) double containing col for tangent point
2419: * --------------------------------------------------------------------------
2420: * Returns: ( int ) 1 if line drawn okay,
2421: * or 0 for any error.
2422: * --------------------------------------------------------------------------
2423: * Notes: o Recurses, drawing left- and right-halves of bezier curve
2424: * until a point is found
2425: * ======================================================================= */
2426: /* --- entry point --- */
2427: int bezier_raster ( raster *rp, double r0, double c0,
2428: double r1, double c1, double rt, double ct )
2429: {
2430: /* -------------------------------------------------------------------------
2431: Allocations and Declarations
2432: -------------------------------------------------------------------------- */
2433: double delrow = fabs(r1-r0), /* 0 if same row */
2434: delcol = fabs(c1-c0), /* 0 if same col */
2435: tolerance = 0.5; /* draw curve when it goes to point*/
2436: double midrow = 0.5*(r0+r1), /* midpoint row */
2437: midcol = 0.5*(c0+c1); /* midpoint col */
2438: int irow=0, icol=0; /* point to be drawn */
2439: int status = 1; /* return status */
2440: /* -------------------------------------------------------------------------
2441: recurse if either delta > tolerance
2442: -------------------------------------------------------------------------- */
2443: if ( delrow > tolerance /* row hasn't converged */
2444: || delcol > tolerance ) /* col hasn't converged */
2445: { bezier_raster(rp, r0,c0, /* left half */
2446: 0.5*(rt+midrow), 0.5*(ct+midcol),
2447: 0.5*(r0+rt), 0.5*(c0+ct) );
2448: bezier_raster(rp, 0.5*(rt+midrow), 0.5*(ct+midcol), /* right half */
2449: r1,c1,
2450: 0.5*(r1+rt), 0.5*(c1+ct) );
2451: return ( 1 ); }
2452: /* -------------------------------------------------------------------------
2453: draw converged point
2454: -------------------------------------------------------------------------- */
2455: /* --- get integer point --- */
2456: irow = iround(midrow); /* row pixel coord */
2457: icol = iround(midcol); /* col pixel coord */
2458: /* --- bounds check --- */
2459: if ( irow>=0 && irow<rp->height /* row in bounds */
2460: && icol>=0 && icol<rp->width ) /* col in bounds */
2461: setpixel(rp,irow,icol,255); /* so set pixel at irow,icol*/
2462: else status = 0; /* bad status if out-of-bounds */
2463: return ( status );
2464: } /* --- end-of-function bezier_raster() --- */
2465:
2466:
2467: /* ==========================================================================
2468: * Function: border_raster ( rp, ntop, nbot, isline, isfree )
2469: * Purpose: Allocate a new raster containing a copy of input rp,
2470: * along with ntop extra rows at top and nbot at bottom,
2471: * and whose width is either adjusted correspondingly,
2472: * or is automatically enlarged to a multiple of 8
2473: * with original bitmap centered
2474: * --------------------------------------------------------------------------
2475: * Arguments: rp (I) raster * to raster on which a border
2476: * is to be placed
2477: * ntop (I) int containing number extra rows at top.
2478: * if negative, abs(ntop) used, and same
2479: * number of extra cols added at left.
2480: * nbot (I) int containing number extra rows at bottom.
2481: * if negative, abs(nbot) used, and same
2482: * number of extra cols added at right.
2483: * isline (I) int containing 0 to leave border pixels clear
2484: * or >0 to draw a line around border of width
2485: * isline.
2486: * isfree (I) int containing true to free rp before return
2487: * --------------------------------------------------------------------------
2488: * Returns: ( raster * ) ptr to bordered raster,
2489: * or NULL for any error.
2490: * --------------------------------------------------------------------------
2491: * Notes: o
2492: * ======================================================================= */
2493: /* --- entry point --- */
2494: raster *border_raster ( raster *rp, int ntop, int nbot,
2495: int isline, int isfree )
2496: {
2497: /* -------------------------------------------------------------------------
2498: Allocations and Declarations
2499: -------------------------------------------------------------------------- */
2500: raster *new_raster(), *bp=(raster *)NULL; /*raster back to caller*/
2501: int rastput(); /* overlay rp in new bordered raster */
2502: int width = (rp==NULL?0:rp->width), /* height of raster */
2503: height = (rp==NULL?0:rp->height), /* width of raster */
2504: istopneg=0, isbotneg=0, /* true if ntop or nbot negative */
2505: leftmargin = 0; /* adjust width to whole number of bytes */
2506: int delete_raster(); /* to free input rp if isdelete is true */
2507: /* -------------------------------------------------------------------------
2508: Initialization
2509: -------------------------------------------------------------------------- */
2510: if ( rp == NULL ) goto end_of_job; /* no input raster provided */
2511: if ( isstring || (1 && rp->height==1) ) /* explicit string signal or infer */
2512: { bp=rp; goto end_of_job; } /* return ascii string unchanged */
2513: /* --- check for negative args --- */
2514: if ( ntop < 0 ) { ntop = -ntop; istopneg=1; } /*flip positive and set flag*/
2515: if ( nbot < 0 ) { nbot = -nbot; isbotneg=1; } /*flip positive and set flag*/
2516: /* --- adjust height for ntop and nbot margins --- */
2517: height += (ntop+nbot); /* adjust height for margins */
2518: /* --- adjust width for left and right margins --- */
2519: if ( istopneg || isbotneg ) /*caller wants nleft=ntop and/or nright=nbot*/
2520: { /* --- adjust width (and leftmargin) as requested by caller -- */
2521: if ( istopneg ) { width += ntop; leftmargin = ntop; }
2522: if ( isbotneg ) width += nbot; }
2523: else
2524: { /* --- or adjust width (and leftmargin) to whole number of bytes --- */
2525: leftmargin = (width%8==0? 0 : 8-(width%8)); /*makes width multiple of 8*/
2526: width += leftmargin; /* width now multiple of 8 */
2527: leftmargin /= 2; } /* center original raster */
2528: /* -------------------------------------------------------------------------
2529: allocate bordered raster, and embed rp within it
2530: -------------------------------------------------------------------------- */
2531: /* --- allocate bordered raster --- */
2532: if ( (bp=new_raster(width,height,rp->pixsz)) /*allocate bordered raster*/
2533: == (raster *)NULL ) goto end_of_job; /* and quit if failed */
2534: /* --- embed rp in it --- */
2535: rastput(bp,rp,ntop,leftmargin,1); /* rp embedded in bp */
2536: /* -------------------------------------------------------------------------
2537: draw border if requested
2538: -------------------------------------------------------------------------- */
2539: if ( isline )
2540: { int irow, icol, nthick=isline; /*height,width index, line thickness*/
2541: /* --- draw left- and right-borders --- */
2542: for ( irow=0; irow<height; irow++ ) /* for each row of bp */
2543: for ( icol=0; icol<nthick; icol++ ) /* and each pixel of thickness */
2544: { setpixel(bp,irow,icol,255); /* left border */
2545: setpixel(bp,irow,width-1-icol,255); } /* right border */
2546: /* --- draw top- and bottom-borders --- */
2547: for ( icol=0; icol<width; icol++ ) /* for each col of bp */
2548: for ( irow=0; irow<nthick; irow++ ) /* and each pixel of thickness */
2549: { setpixel(bp,irow,icol,255); /* top border */
2550: setpixel(bp,height-1-irow,icol,255); } /* bottom border */
2551: } /* --- end-of-if(isline) --- */
2552: /* -------------------------------------------------------------------------
2553: free rp if no longer needed
2554: -------------------------------------------------------------------------- */
2555: if ( isfree ) /*caller no longer needs rp*/
2556: delete_raster(rp); /* so free it for him */
2557: /* -------------------------------------------------------------------------
2558: Back to caller with bordered raster (or null for any error)
2559: -------------------------------------------------------------------------- */
2560: end_of_job:
2561: return ( bp ); /* back with bordered or null ptr */
2562: } /* --- end-of-function border_raster() --- */
2563:
2564:
2565: /* ==========================================================================
2566: * Function: type_raster ( rp, fp )
2567: * Purpose: Emit an ascii dump representing rp, on fp.
2568: * --------------------------------------------------------------------------
2569: * Arguments: rp (I) ptr to raster struct for which an
2570: * ascii dump is to be constructed.
2571: * fp (I) File ptr to output device (defaults to
2572: * stdout if passed as NULL).
2573: * --------------------------------------------------------------------------
2574: * Returns: ( int ) 1 if completed successfully,
2575: * or 0 otherwise (for any error).
2576: * --------------------------------------------------------------------------
2577: * Notes:
2578: * ======================================================================= */
2579: /* --- entry point --- */
2580: int type_raster ( raster *rp, FILE *fp )
2581: {
2582: /* -------------------------------------------------------------------------
2583: Allocations and Declarations
2584: -------------------------------------------------------------------------- */
2585: static int display_width = 72; /* max columns for display */
2586: static char display_chars[16] = /* display chars for bytemap */
2587: { ' ','1','2','3','4','5','6','7','8','9','A','B','C','D','E','*' };
2588: char scanline[133]; /* ascii image for one scan line */
2589: int scan_width; /* #chars in scan (<=display_width)*/
2590: int irow, locol,hicol=(-1); /* height index, width indexes */
2591: /* --------------------------------------------------------------------------
2592: initialization
2593: -------------------------------------------------------------------------- */
2594: /* --- redirect null fp --- */
2595: if ( fp == (FILE *)NULL ) fp = stdout; /* default fp to stdout if null */
2596: /* --- check for ascii string --- */
2597: if ( isstring /* pixmap has string, not raster */
2598: || (1 && rp->height==1) ) /* infer input rp is a string */
2599: {
2600: char *string = (char *)(rp->pixmap); /*interpret pixmap as ascii string*/
2601: int width = strlen(string); /* #chars in ascii string */
2602: while ( width > display_width-2 ) /* too big for one line */
2603: { fprintf(fp,"\"%.*s\"\n",display_width-2,string); /*display leading chars*/
2604: string += (display_width-2); /* bump string past displayed chars*/
2605: width -= (display_width-2); } /* decrement remaining width */
2606: fprintf(fp,"\"%.*s\"\n",width,string); /* display trailing chars */
2607: return ( 1 );
2608: } /* --- end-of-if(isstring) --- */
2609: /* --------------------------------------------------------------------------
2610: display ascii dump of bitmap image (in segments if display_width < rp->width)
2611: -------------------------------------------------------------------------- */
2612: while ( (locol=hicol+1) < rp->width ) /*start where prev segment left off*/
2613: {
2614: /* --- set hicol for this pass (locol set above) --- */
2615: hicol += display_width; /* show as much as display allows */
2616: if (hicol >= rp->width) hicol = rp->width - 1; /*but not more than raster*/
2617: scan_width = hicol-locol+1; /* #chars in this scan */
2618: if ( locol > 0 ) fprintf(fp,"----------\n"); /*separator between segments*/
2619: /* ------------------------------------------------------------------------
2620: display all scan lines for this local...hicol segment range
2621: ------------------------------------------------------------------------ */
2622: for ( irow=0; irow<rp->height; irow++ ) /* all scan lines for col range */
2623: {
2624: /* --- allocations and declarations --- */
2625: int ipix, /* pixmap[] index for this scan */
2626: lopix = irow*rp->width + locol; /*first pixmap[] pixel in this scan*/
2627: /* --- set chars in scanline[] based on pixels in rp->pixmap[] --- */
2628: for ( ipix=0; ipix<scan_width; ipix++ ) /* set each char */
2629: if ( rp->pixsz == 1 ) /*' '=0 or '*'=1 to display bitmap*/
2630: scanline[ipix] = (getlongbit(rp->pixmap,lopix+ipix)==1? '*':'.');
2631: else /* should have a bytemap */
2632: if ( rp->pixsz == 8 ) /* double-check pixsz for bytemap */
2633: { int pixval = (int)((rp->pixmap)[lopix+ipix]), /*pixel's byte value*/
2634: ichar = min2(15,pixval/16); /* index for ' ', '1'...'e', '*' */
2635: scanline[ipix] = display_chars[ichar]; } /*set ' ' for 0-15, etc*/
2636: /* --- display completed scan line --- */
2637: fprintf(fp,"%.*s\n",scan_width,scanline);
2638: } /* --- end-of-for(irow) --- */
2639: } /* --- end-of-while(hicol<rp->width) --- */
2640: /* -------------------------------------------------------------------------
2641: Back to caller with 1=okay, 0=failed.
2642: -------------------------------------------------------------------------- */
2643: return ( 1 );
2644: } /* --- end-of-function type_raster() --- */
2645:
2646:
2647: /* ==========================================================================
2648: * Function: type_bytemap ( bp, grayscale, width, height, fp )
2649: * Purpose: Emit an ascii dump representing bp, on fp.
2650: * --------------------------------------------------------------------------
2651: * Arguments: bp (I) intbyte * to bytemap for which an
2652: * ascii dump is to be constructed.
2653: * grayscale (I) int containing #gray shades, 256 for 8-bit
2654: * width (I) int containing #cols in bytemap
2655: * height (I) int containing #rows in bytemap
2656: * fp (I) File ptr to output device (defaults to
2657: * stdout if passed as NULL).
2658: * --------------------------------------------------------------------------
2659: * Returns: ( int ) 1 if completed successfully,
2660: * or 0 otherwise (for any error).
2661: * --------------------------------------------------------------------------
2662: * Notes:
2663: * ======================================================================= */
2664: /* --- entry point --- */
2665: int type_bytemap ( intbyte *bp, int grayscale,
2666: int width, int height, FILE *fp )
2667: {
2668: /* -------------------------------------------------------------------------
2669: Allocations and Declarations
2670: -------------------------------------------------------------------------- */
2671: static int display_width = 72; /* max columns for display */
2672: int byte_width = 3, /* cols to display byte (ff+space) */
2673: maxbyte = 0; /* if maxbyte<16, set byte_width=2 */
2674: int white_byte = 0, /* show dots for white_byte's */
2675: black_byte = grayscale-1; /* show stars for black_byte's */
2676: char scanline[133]; /* ascii image for one scan line */
2677: int scan_width, /* #chars in scan (<=display_width)*/
2678: scan_cols; /* #cols in scan (hicol-locol+1) */
2679: int ibyte, /* bp[] index */
2680: irow, locol,hicol=(-1); /* height index, width indexes */
2681: /* --------------------------------------------------------------------------
2682: initialization
2683: -------------------------------------------------------------------------- */
2684: /* --- redirect null fp --- */
2685: if ( fp == (FILE *)NULL ) fp = stdout; /* default fp to stdout if null */
2686: /* --- check for ascii string --- */
2687: if ( isstring ) /* bp has ascii string, not raster */
2688: { width = strlen((char *)bp); /* #chars in ascii string */
2689: height = 1; } /* default */
2690: /* --- see if we can get away with byte_width=1 --- */
2691: for ( ibyte=0; ibyte<width*height; ibyte++ ) /* check all bytes */
2692: { int byteval = (int)bp[ibyte]; /* current byte value */
2693: if ( byteval < black_byte ) /* if it's less than black_byte */
2694: maxbyte = max2(maxbyte,byteval); } /* then find max non-black value */
2695: if ( maxbyte < 16 ) /* bytevals will fit in one column */
2696: byte_width = 1; /* so reset display byte_width */
2697: /* --------------------------------------------------------------------------
2698: display ascii dump of bitmap image (in segments if display_width < rp->width)
2699: -------------------------------------------------------------------------- */
2700: while ( (locol=hicol+1) < width ) /*start where prev segment left off*/
2701: {
2702: /* --- set hicol for this pass (locol set above) --- */
2703: hicol += display_width/byte_width; /* show as much as display allows */
2704: if (hicol >= width) hicol = width - 1; /* but not more than bytemap */
2705: scan_cols = hicol-locol+1; /* #cols in this scan */
2706: scan_width = byte_width*scan_cols; /* #chars in this scan */
2707: if ( locol>0 && !isstring ) fprintf(fp,"----------\n"); /* separator */
2708: /* ------------------------------------------------------------------------
2709: display all scan lines for this local...hicol segment range
2710: ------------------------------------------------------------------------ */
2711: for ( irow=0; irow<height; irow++ ) /* all scan lines for col range */
2712: {
2713: /* --- allocations and declarations --- */
2714: int lobyte = irow*width + locol; /* first bp[] byte in this scan */
2715: char scanbyte[32]; /* sprintf() buffer for byte */
2716: /* --- set chars in scanline[] based on bytes in bytemap bp[] --- */
2717: memset(scanline,' ',scan_width); /* blank out scanline */
2718: for ( ibyte=0; ibyte<scan_cols; ibyte++ ) /* set chars for each col */
2719: { int byteval = (int)bp[lobyte+ibyte]; /* value of current byte */
2720: memset(scanbyte,'.',byte_width); /* dot-fill scanbyte */
2721: if ( byteval == black_byte ) /* but if we have a black byte */
2722: memset(scanbyte,'*',byte_width); /* star-fill scanbyte instead */
2723: if ( byte_width > 1 ) /* don't blank out single char */
2724: scanbyte[byte_width-1] = ' '; /* blank-fill rightmost character */
2725: if ( byteval != white_byte /* format bytes that are non-white */
2726: && byteval != black_byte ) /* and that are non-black */
2727: sprintf(scanbyte,"%*x ",max2(1,byte_width-1),byteval); /*hex-format*/
2728: memcpy(scanline+ibyte*byte_width,scanbyte,byte_width); } /*in line*/
2729: /* --- display completed scan line --- */
2730: fprintf(fp,"%.*s\n",scan_width,scanline);
2731: } /* --- end-of-for(irow) --- */
2732: } /* --- end-of-while(hicol<width) --- */
2733: /* -------------------------------------------------------------------------
2734: Back to caller with 1=okay, 0=failed.
2735: -------------------------------------------------------------------------- */
2736: return ( 1 );
2737: } /* --- end-of-function type_bytemap() --- */
2738:
2739:
2740: /* ==========================================================================
2741: * Function: xbitmap_raster ( rp, fp )
2742: * Purpose: Emit a mime xbitmap representing rp, on fp.
2743: * --------------------------------------------------------------------------
2744: * Arguments: rp (I) ptr to raster struct for which a mime
2745: * xbitmap is to be constructed.
2746: * fp (I) File ptr to output device (defaults to
2747: * stdout if passed as NULL).
2748: * --------------------------------------------------------------------------
2749: * Returns: ( int ) 1 if completed successfully,
2750: * or 0 otherwise (for any error).
2751: * --------------------------------------------------------------------------
2752: * Notes:
2753: * ======================================================================= */
2754: /* --- entry point --- */
2755: int xbitmap_raster ( raster *rp, FILE *fp )
2756: {
2757: /* -------------------------------------------------------------------------
2758: Allocations and Declarations
2759: -------------------------------------------------------------------------- */
2760: char *title = "image"; /* dummy title */
2761: int hex_bitmap(); /* dump bitmap as hex bytes */
2762: /* --------------------------------------------------------------------------
2763: emit text to display mime xbitmap representation of rp->bitmap image
2764: -------------------------------------------------------------------------- */
2765: /* --- first redirect null fp --- */
2766: if ( fp == (FILE *)NULL ) fp = stdout; /* default fp to stdout if null */
2767: /* --- check for ascii string --- */
2768: if ( isstring ) /* pixmap has string, not raster */
2769: return ( 0 ); /* can't handle ascii string */
2770: /* --- emit prologue strings and hex dump of bitmap for mime xbitmap --- */
2771: fprintf( fp, "Content-type: image/x-xbitmap\n\n" );
2772: fprintf( fp, "#define %s_width %d\n#define %s_height %d\n",
2773: title,rp->width, title,rp->height );
2774: fprintf( fp, "static char %s_bits[] = {\n", title );
2775: hex_bitmap(rp,fp,0,0); /* emit hex dump of bitmap bytes */
2776: fprintf (fp,"};\n"); /* ending with "};" for C array */
2777: /* -------------------------------------------------------------------------
2778: Back to caller with 1=okay, 0=failed.
2779: -------------------------------------------------------------------------- */
2780: return ( 1 );
2781: } /* --- end-of-function xbitmap_raster() --- */
2782:
2783:
2784: /* ==========================================================================
2785: * Function: cstruct_chardef ( cp, fp, col1 )
2786: * Purpose: Emit a C struct of cp on fp, starting in col1.
2787: * --------------------------------------------------------------------------
2788: * Arguments: cp (I) ptr to chardef struct for which
2789: * a C struct is to be generated.
2790: * fp (I) File ptr to output device (defaults to
2791: * stdout if passed as NULL).
2792: * col1 (I) int containing 0...65; output lines
2793: * are preceded by col1 blanks.
2794: * --------------------------------------------------------------------------
2795: * Returns: ( int ) 1 if completed successfully,
2796: * or 0 otherwise (for any error).
2797: * --------------------------------------------------------------------------
2798: * Notes:
2799: * ======================================================================= */
2800: /* --- entry point --- */
2801: int cstruct_chardef ( chardef *cp, FILE *fp, int col1 )
2802: {
2803: /* -------------------------------------------------------------------------
2804: Allocations and Declarations
2805: -------------------------------------------------------------------------- */
2806: char field[64]; /* field within output line */
2807: int cstruct_raster(), /* emit a raster */
2808: emit_string(); /* emit a string and comment */
2809: /* -------------------------------------------------------------------------
2810: emit charnum, location, name / hirow, hicol, lorow, locol
2811: -------------------------------------------------------------------------- */
2812: /* --- charnum, location, name --- */
2813: sprintf(field,"{ %3d,%5d,\n", cp->charnum,cp->location); /*char#,location*/
2814: emit_string ( fp, col1, field, "character number, location");
2815: /* --- toprow, topleftcol, botrow, botleftcol --- */
2816: sprintf(field," %3d,%2d, %3d,%2d,\n", /* format... */
2817: cp->toprow,cp->topleftcol, /* toprow, topleftcol, */
2818: cp->botrow,cp->botleftcol); /* and botrow, botleftcol */
2819: emit_string ( fp, col1, field, "topleft row,col, and botleft row,col");
2820: /* -------------------------------------------------------------------------
2821: emit raster and chardef's closing brace, and then return to caller
2822: -------------------------------------------------------------------------- */
2823: cstruct_raster(&cp->image,fp,col1+4); /* emit raster */
2824: emit_string ( fp, 0, " }", NULL); /* emit closing brace */
2825: return ( 1 ); /* back to caller with 1=okay, 0=failed */
2826: } /* --- end-of-function cstruct_chardef() --- */
2827:
2828:
2829: /* ==========================================================================
2830: * Function: cstruct_raster ( rp, fp, col1 )
2831: * Purpose: Emit a C struct of rp on fp, starting in col1.
2832: * --------------------------------------------------------------------------
2833: * Arguments: rp (I) ptr to raster struct for which
2834: * a C struct is to be generated.
2835: * fp (I) File ptr to output device (defaults to
2836: * stdout if passed as NULL).
2837: * col1 (I) int containing 0...65; output lines
2838: * are preceded by col1 blanks.
2839: * --------------------------------------------------------------------------
2840: * Returns: ( int ) 1 if completed successfully,
2841: * or 0 otherwise (for any error).
2842: * --------------------------------------------------------------------------
2843: * Notes:
2844: * ======================================================================= */
2845: /* --- entry point --- */
2846: int cstruct_raster ( raster *rp, FILE *fp, int col1 )
2847: {
2848: /* -------------------------------------------------------------------------
2849: Allocations and Declarations
2850: -------------------------------------------------------------------------- */
2851: char field[64]; /* field within output line */
2852: char typecast[64] = "(pixbyte *)"; /* type cast for pixmap string */
2853: int hex_bitmap(); /* to emit raster bitmap */
2854: int emit_string(); /* emit a string and comment */
2855: /* -------------------------------------------------------------------------
2856: emit width and height
2857: -------------------------------------------------------------------------- */
2858: sprintf(field,"{ %2d, %3d,%2d, %s\n", /* format width,height,pixsz */
2859: rp->width,rp->height,rp->pixsz,typecast);
2860: emit_string ( fp, col1, field, "widthxheight, pixsz,map...");
2861: /* -------------------------------------------------------------------------
2862: emit bitmap and closing brace, and return to caller
2863: -------------------------------------------------------------------------- */
2864: hex_bitmap(rp,fp,col1+2,1); /* emit bitmap */
2865: emit_string ( fp, 0, " }", NULL); /* emit closing brace */
2866: return ( 1 ); /* back to caller with 1=okay, 0=failed */
2867: } /* --- end-of-function cstruct_raster() --- */
2868:
2869:
2870: /* ==========================================================================
2871: * Function: hex_bitmap ( rp, fp, col1, isstr )
2872: * Purpose: Emit a hex dump of the bitmap of rp on fp, starting in col1.
2873: * If isstr (is string) is true, the dump is of the form
2874: * "\x01\x02\x03\x04\x05..."
2875: * Otherwise, if isstr is false, the dump is of the form
2876: * 0x01,0x02,0x03,0x04,0x05...
2877: * --------------------------------------------------------------------------
2878: * Arguments: rp (I) ptr to raster struct for which
2879: * a hex dump is to be constructed.
2880: * fp (I) File ptr to output device (defaults to
2881: * stdout if passed as NULL).
2882: * col1 (I) int containing 0...65; output lines
2883: * are preceded by col1 blanks.
2884: * isstr (I) int specifying dump format as described above
2885: * --------------------------------------------------------------------------
2886: * Returns: ( int ) 1 if completed successfully,
2887: * or 0 otherwise (for any error).
2888: * --------------------------------------------------------------------------
2889: * Notes:
2890: * ======================================================================= */
2891: /* --- entry point --- */
2892: int hex_bitmap ( raster *rp, FILE *fp, int col1, int isstr )
2893: {
2894: /* -------------------------------------------------------------------------
2895: Allocations and Declarations
2896: -------------------------------------------------------------------------- */
2897: int ibyte, nbytes=pixmapsz(rp); /* #bytes in raster */
2898: char stub[64]=" ";/* col1 leading blanks */
2899: int linewidth = 64, /* (roughly) rightmost column */
2900: colwidth = (isstr? 4:5); /* #cols required for each byte */
2901: int ncols = (linewidth-col1)/colwidth; /* new line after ncols bytes */
2902: /* --------------------------------------------------------------------------
2903: initialization
2904: -------------------------------------------------------------------------- */
2905: /* --- redirect null fp --- */
2906: if ( fp == (FILE *)NULL ) fp = stdout; /* default fp to stdout if null */
2907: /* --- emit initial stub if wanted --- */
2908: if ( col1 > 0 ) fprintf(fp,"%.*s",col1,stub); /* stub preceding 1st line */
2909: /* --------------------------------------------------------------------------
2910: emit hex dump of rp->bitmap image
2911: -------------------------------------------------------------------------- */
2912: if ( isstr ) fprintf(fp,"\""); /* opening " before first line */
2913: for ( ibyte=0; ibyte<nbytes; ibyte++ ) /* one byte at a time */
2914: {
2915: /* --- display a byte as hex char or number, depending on isstr --- */
2916: if ( isstr ) /* string format wanted */
2917: fprintf(fp,"\\x%02x",(rp->pixmap)[ibyte]); /*print byte as hex char*/
2918: else /* comma-separated format wanted */
2919: fprintf(fp,"0x%02x",(rp->pixmap)[ibyte]); /*print byte as hex number*/
2920: /* --- add a separator and newline, etc, as necessary --- */
2921: if ( ibyte < nbytes-1) /* not the last byte yet */
2922: {
2923: if ( !isstr ) fprintf(fp,","); /* follow hex number with comma */
2924: if ( (ibyte+1)%ncols==0 ) /* need new line after every ncols */
2925: if ( !isstr ) /* for hex numbers format ... */
2926: fprintf(fp,"\n%.*s",col1,stub); /* ...just need newline and stub */
2927: else /* for string format... */
2928: fprintf(fp,"\"\n%.*s\"",col1,stub); /* ...need closing, opening "s */
2929: } /* --- end-of-if(ibyte<nbytes-1) --- */
2930: } /* --- end-of-for(ibyte) --- */
2931: if ( isstr ) fprintf(fp,"\""); /* closing " after last line */
2932: return ( 1 ); /* back with 1=okay, 0=failed */
2933: } /* --- end-of-function hex_bitmap() --- */
2934:
2935:
2936: /* ==========================================================================
2937: * Function: emit_string ( fp, col1, string, comment )
2938: * Purpose: Emit string on fp, starting in col1,
2939: * and followed by right-justified comment.
2940: * --------------------------------------------------------------------------
2941: * Arguments: fp (I) File ptr to output device (defaults to
2942: * stdout if passed as NULL).
2943: * col1 (I) int containing 0 or #blanks preceding string
2944: * string (I) char * containing string to be emitted.
2945: * If last char of string is '\n',
2946: * the emitted line ends with a newline,
2947: * otherwise not.
2948: * comment (I) NULL or char * containing right-justified
2949: * comment (we enclose between /star and star/)
2950: * --------------------------------------------------------------------------
2951: * Returns: ( int ) 1 if completed successfully,
2952: * or 0 otherwise (for any error).
2953: * --------------------------------------------------------------------------
2954: * Notes: o
2955: * ======================================================================= */
2956: /* --- entry point --- */
2957: int emit_string ( FILE *fp, int col1, char *string, char *comment )
2958: {
2959: /* -------------------------------------------------------------------------
2960: Allocations and Declarations
2961: -------------------------------------------------------------------------- */
2962: char line[256]; /* construct line with caller's fields */
2963: int fieldlen; /* #chars in one of caller's fields */
2964: int linelen = 72; /*line length (for right-justified comment)*/
2965: int isnewline = 0; /* true to emit \n at end of line */
2966: /* --------------------------------------------------------------------------
2967: construct line containing prolog, string, epilog, and finally comment
2968: -------------------------------------------------------------------------- */
2969: /* --- init line --- */
2970: memset(line,' ',255); /* start line with blanks */
2971: /* --- embed string into line --- */
2972: if ( string != NULL ) /* if caller gave us a string... */
2973: { fieldlen = strlen(string); /* #cols required for string */
2974: if ( string[fieldlen-1] == '\n' ) /* check last char for newline */
2975: { isnewline = 1; /* got it, so set flag */
2976: fieldlen--; } /* but don't print it yet */
2977: memcpy(line+col1,string,fieldlen); /* embid string starting at col1 */
2978: col1 += fieldlen; } /* bump col past epilog */
2979: /* --- embed comment into line --- */
2980: if ( comment != NULL ) /* if caller gave us a comment... */
2981: { fieldlen = 6 + strlen(comment); /* plus /star, star/, 2 spaces */
2982: if ( linelen-fieldlen < col1 ) /* comment won't fit */
2983: fieldlen -= (col1 - (linelen-fieldlen)); /* truncate comment to fit */
2984: if ( fieldlen > 6 ) /* can fit all or part of comment */
2985: sprintf(line+linelen-fieldlen,"/%c %.*s %c/", /* so embed it in line */
2986: '*', fieldlen-6,comment, '*');
2987: col1 = linelen; } /* indicate line filled */
2988: /* --- line completed --- */
2989: line[col1] = '\000'; /* null-terminate completed line */
2990: /* -------------------------------------------------------------------------
2991: emit line, then back to caller with 1=okay, 0=failed.
2992: -------------------------------------------------------------------------- */
2993: /* --- first redirect null fp --- */
2994: if ( fp == (FILE *)NULL ) fp = stdout; /* default fp to stdout if null */
2995: /* --- emit line (and optional newline) --- */
2996: fprintf(fp,"%.*s",linelen,line); /* no more than linelen chars */
2997: if ( isnewline ) fprintf(fp,"\n"); /*caller wants terminating newline*/
2998: return ( 1 );
2999: } /* --- end-of-function emit_string() --- */
3000:
3001:
3002: /* ==========================================================================
3003: * Function: get_symdef ( symbol )
3004: * Purpose: returns mathchardef struct for symbol
3005: * --------------------------------------------------------------------------
3006: * Arguments: symbol (I) char * containing symbol
3007: * whose corresponding mathchardef is wanted
3008: * --------------------------------------------------------------------------
3009: * Returns: ( mathchardef * ) pointer to struct defining symbol,
3010: * or NULL for any error
3011: * --------------------------------------------------------------------------
3012: * Notes: o Input symbol need only contain a leading substring to match,
3013: * e.g., \gam passed in symbol will match \gamma in the table.
3014: * If the table contains two or more possible matches,
3015: * the shortest is returned, e.g., input \e will return with
3016: * data for \eta rather than \epsilon. To get \epsilon,
3017: * you must pass a leading substring long enough to eliminate
3018: * shorter table matches, i.e., in this case \ep
3019: * ======================================================================= */
3020: /* --- entry point --- */
3021: mathchardef *get_symdef ( char *symbol )
3022: {
3023: /* -------------------------------------------------------------------------
3024: Allocations and Declarations
3025: -------------------------------------------------------------------------- */
3026: mathchardef *symdefs = symtable; /* table of mathchardefs */
3027: int idef = 0, /* symdefs[] index */
3028: bestdef = (-9999); /*index of shortest matching symdef*/
3029: int symlen = strlen(symbol), /* length of input symbol */
3030: deflen, minlen=9999; /*length of shortest matching symdef*/
3031: int /*alnumsym = (symlen==1 && isalnum(*symbol)),*/ /*alphanumeric sym*/
3032: alphasym = (symlen==1 && isalpha(*symbol)); /* or alpha symbol */
3033: static char *displaysyms[][2] = { /*xlate to Big sym for \displaystyle*/
3034: {"\\int", "\\Bigint"},
3035: {"\\oint", "\\Bigoint"},
3036: {"\\sum", "\\Bigsum"},
3037: {"\\prod", "\\Bigprod"},
3038: {"\\coprod", "\\Bigcoprod"},
3039: {"\\cup", "\\Bigcup"},
3040: {"\\sqcup", "\\Bigsqcup"},
3041: {"\\cap", "\\Bigcap"},
3042: {"\\sqcap", "\\sqcap"}, /* don't have \Bigsqcap */
3043: {"\\odot", "\\Bigodot"},
3044: {"\\oplus", "\\Bigoplus"},
3045: {"\\otimes", "\\Bigotimes"},
3046: {"\\uplus", "\\Biguplus"},
3047: {"\\wedge", "\\Bigwedge"},
3048: {"\\vee", "\\Bigvee"},
3049: {NULL, NULL} };
3050: /* -------------------------------------------------------------------------
3051: If in \displaystyle mode, first xlate int to Bigint, etc.
3052: -------------------------------------------------------------------------- */
3053: if ( isdisplaystyle > 1 ) /* we're in \displaystyle mode */
3054: for ( idef=0; ; idef++ ) { /* lookup symbol in displaysyms */
3055: char *fromsym = displaysyms[idef][0], /* look for this symbol */
3056: *tosym = displaysyms[idef][1]; /* and xlate it to this symbol */
3057: if ( fromsym == NULL ) break; /* end-of-table */
3058: if ( !strcmp(symbol,fromsym) ) /* found a match */
3059: { if ( msglevel>=99 && msgfp!=NULL ) /* debugging output */
3060: { fprintf(msgfp,"get_symdef> isdisplaystyle=%d, xlated %s to %s\n",
3061: isdisplaystyle,symbol,tosym); fflush(msgfp); }
3062: symbol = tosym; /* so look up tosym instead */
3063: symlen = strlen(symbol); /* reset symbol length */
3064: break; } /* no need to search further */
3065: } /* --- end-of-for(idef) --- */
3066: /* -------------------------------------------------------------------------
3067: search symdefs[] in order for first occurrence of symbol
3068: -------------------------------------------------------------------------- */
3069: for ( idef=0; ;idef++ ) /* until trailer record found */
3070: if ( symdefs[idef].symbol == NULL ) break; /* reached end-of-table */
3071: else /* check against caller's symbol */
3072: if ( strncmp(symbol,symdefs[idef].symbol,symlen) == 0 ) /* found match */
3073: if ( symdefs[idef].handler != NULL /* mode irrelevant for directives */
3074: || istext==0 /* mathmode, so use first match */
3075: || (istext==1 && symdefs[idef].family==CMR10) /*textmode && rm text*/
3076: || (istext==2 && symdefs[idef].family==CMMI10) /*textmode && it text*/
3077: || (istext==3 && symdefs[idef].family==BBOLD10) /*textmode && bb text*/
3078: || (istext!=3 && !alphasym) ) /* not bb and not alpha */
3079: if ( (deflen=strlen(symdefs[idef].symbol)) < minlen ) /*new best match*/
3080: { bestdef = idef; /* save index of new best match */
3081: if ( (minlen = deflen) /* and save its len for next test */
3082: == symlen ) break; } /*perfect match, so return with it*/
3083: if ( bestdef < 0 ) /* failed to look up symbol */
3084: if ( istext != 0 ) /* we're in a restricted font mode */
3085: { int wastext = istext; /* save current mode */
3086: mathchardef *symdef = NULL; /* lookup result with istext=0 */
3087: istext = 0; /*try to look up symbol in any font*/
3088: symdef = get_symdef(symbol); /* repeat lookup with istext=0 */
3089: istext = wastext; /* reset font mode */
3090: return symdef; } /* caller gets istext=0 lookup */
3091: if ( msgfp!=NULL && msglevel>=999 ) /* debugging output */
3092: { fprintf(msgfp,"get_symdefs> symbol=%s matches symtable[%d]=%s\n",
3093: symbol,bestdef,(bestdef<0?"NotFound":symdefs[bestdef].symbol));
3094: fflush(msgfp); }
3095: return ( (bestdef<0? NULL : &(symdefs[bestdef])) ); /*NULL or best symdef[]*/
3096: } /* --- end-of-function get_symdef() --- */
3097:
3098:
3099: /* ==========================================================================
3100: * Function: get_chardef ( symdef, size )
3101: * Purpose: returns chardef ptr containing data for symdef at given size
3102: * --------------------------------------------------------------------------
3103: * Arguments: symdef (I) mathchardef * corresponding to symbol
3104: * whose corresponding chardef is wanted
3105: * size (I) int containing 0-4 for desired size
3106: * --------------------------------------------------------------------------
3107: * Returns: ( chardef * ) pointer to struct defining symbol at size,
3108: * or NULL for any error
3109: * --------------------------------------------------------------------------
3110: * Notes: o if size unavailable, the next-closer-to-normalsize
3111: * is returned instead.
3112: * ======================================================================= */
3113: /* --- entry point --- */
3114: chardef *get_chardef ( mathchardef *symdef, int size )
3115: {
3116: /* -------------------------------------------------------------------------
3117: Allocations and Declarations
3118: -------------------------------------------------------------------------- */
3119: fontfamily *fonts = fonttable; /* table of font families */
3120: chardef **fontdef, /*tables for desired font, by size*/
3121: *gfdata = (chardef *)NULL; /* chardef for symdef,size */
3122: int ifont; /* fonts[] index */
3123: int family, charnum; /* indexes retrieved from symdef */
3124: int sizeinc = 0, /*+1 or -1 to get closer to normal*/
3125: normalsize = 2; /* this size always present */
3126: int isBig = 0; /*true if symbol's 1st char is upper*/
3127: char *symptr = NULL; /* look for 1st alpha of symbol */
3128: /* -------------------------------------------------------------------------
3129: initialization
3130: -------------------------------------------------------------------------- */
3131: /* --- check symdef --- */
3132: if ( symdef == NULL ) return ( NULL ); /* get_symdef() probably failed */
3133: /* --- get local copy of indexes from symdef --- */
3134: family = symdef->family; /* font family containing symbol */
3135: charnum = symdef->charnum; /* char# of symbol within font */
3136: /* --- check for supersampling --- */
3137: if ( issupersampling ) /* check for supersampling fonts */
3138: if ( fonts != ssfonttable ) /* uh oh--probably internal error */
3139: { fonts = ssfonttable; } /* force it */
3140: /* --- check requested size, and set size increment --- */
3141: if ( 0 && issupersampling ) /* set size index for supersampling */
3142: size = LARGESTSIZE+1; /* index 1 past largest size */
3143: else /* low pass indexes 0...LARGESTSIZE */
3144: {
3145: if( size<0 ) size = 0; /* size was definitely too small */
3146: if( size>LARGESTSIZE ) size = LARGESTSIZE; /* or definitely too large */
3147: if( size<normalsize ) sizeinc = (+1); /*use next larger if size too small*/
3148: if( size>normalsize ) sizeinc = (-1); /*or next smaller if size too large*/
3149: }
3150: /* --- check for really big symbol (1st char of symbol name uppercase) --- */
3151: for ( symptr=symdef->symbol; *symptr!='\000'; symptr++ ) /*skip leading \'s*/
3152: if ( isalpha(*symptr) ) /* found leading alpha char */
3153: { isBig = isupper(*symptr); /* is 1st char of name uppercase? */
3154: if ( !isBig /* 1st char lowercase */
3155: && strlen(symptr) >= 4 ) /* but followed by at least 3 chars */
3156: isBig = !memcmp(symptr,"big\\",4) /* isBig if name starts with big\ */
3157: || !memcmp(symptr,"bigg",4); /* or with bigg */
3158: break; } /* don't check beyond 1st char */
3159: /* -------------------------------------------------------------------------
3160: find font family in table of fonts[]
3161: -------------------------------------------------------------------------- */
3162: /* --- look up font family --- */
3163: for ( ifont=0; ;ifont++ ) /* until trailer record found */
3164: if ( fonts[ifont].family < 0 ) return ( NULL ); /* error, no such family */
3165: else if ( fonts[ifont].family == family ) break; /* found font family */
3166: /* --- get local copy of table for this family by size --- */
3167: fontdef = fonts[ifont].fontdef; /* font by size */
3168: /* -------------------------------------------------------------------------
3169: get font in desired size, or closest available size, and return symbol
3170: -------------------------------------------------------------------------- */
3171: /* --- get font in desired size --- */
3172: while ( 1 ) /* find size or closest available */
3173: if ( fontdef[size] != NULL ) break; /* found available size */
3174: else /* adjust size closer to normal */
3175: if ( size == NORMALSIZE /* already normal so no more sizes,*/
3176: || sizeinc == 0 ) return ( NULL); /* or must be supersampling */
3177: else /*bump size 1 closer to NORMALSIZE*/
3178: size += sizeinc; /* see if adjusted size available */
3179: /* --- ptr to chardef struct --- */
3180: gfdata = &((fontdef[size])[charnum]); /*ptr to chardef for symbol in size*/
3181: /* -------------------------------------------------------------------------
3182: kludge to tweak CMEX10 (which appears to have incorrect descenders)
3183: -------------------------------------------------------------------------- */
3184: if ( family == CMEX10 ) /* cmex10 needs tweak */
3185: { int height = gfdata->toprow - gfdata->botrow + 1; /*total height of char*/
3186: gfdata->botrow = (isBig? (-height/3) : (-height/4));
3187: gfdata->toprow = gfdata->botrow + gfdata->image.height; }
3188: /* -------------------------------------------------------------------------
3189: return subraster containing chardef data for symbol in requested size
3190: -------------------------------------------------------------------------- */
3191: return ( gfdata ); /*ptr to chardef for symbol in size*/
3192: } /* --- end-of-function get_chardef() --- */
3193:
3194:
3195: /* ==========================================================================
3196: * Function: get_charsubraster ( symdef, size )
3197: * Purpose: returns new subraster ptr containing
3198: * data for symdef at given size
3199: * --------------------------------------------------------------------------
3200: * Arguments: symdef (I) mathchardef * corresponding to symbol
3201: * whose corresponding chardef is wanted
3202: * size (I) int containing 0-4 for desired size
3203: * --------------------------------------------------------------------------
3204: * Returns: ( subraster * ) pointer to struct defining symbol at size,
3205: * or NULL for any error
3206: * --------------------------------------------------------------------------
3207: * Notes: o just wraps a subraster envelope around get_chardef()
3208: * ======================================================================= */
3209: /* --- entry point --- */
3210: subraster *get_charsubraster ( mathchardef *symdef, int size )
3211: {
3212: /* -------------------------------------------------------------------------
3213: Allocations and Declarations
3214: -------------------------------------------------------------------------- */
3215: chardef *get_chardef(), *gfdata=NULL; /* chardef struct for symdef,size */
3216: int get_baseline(); /* baseline of gfdata */
3217: subraster *new_subraster(), *sp=NULL; /* subraster containing gfdata */
3218: int aasupsamp(), /*antialias char with supersampling*/
3219: grayscale=256; /* aasupersamp() parameters */
3220: /* -------------------------------------------------------------------------
3221: look up chardef for symdef at size, and embed data (gfdata) in subraster
3222: -------------------------------------------------------------------------- */
3223: if ( (gfdata=get_chardef(symdef,size)) /* look up chardef for symdef,size */
3224: != NULL ) /* and check that we found it */
3225: if ( (sp=new_subraster(0,0,0)) /* allocate subraster "envelope" */
3226: != NULL ) /* and check that we succeeded */
3227: {
3228: sp->type = CHARASTER; /* static character raster */
3229: sp->symdef = symdef; /* replace NULL with caller's arg */
3230: sp->size = size; /*replace default with caller's size*/
3231: sp->baseline = get_baseline(gfdata); /* get baseline of character */
3232: sp->image = &(gfdata->image); /* store ptr to its bitmap */
3233: if ( issupersampling ) /* antialias character right here */
3234: {
3235: raster *aa = NULL; /* antialiased char raster */
3236: int status = aasupsamp(sp->image,&aa,shrinkfactor,grayscale);
3237: if ( status ) /* supersampled successfully */
3238: { int baseline = sp->baseline; /* baseline before supersampling */
3239: int height = gfdata->image.height; /* #rows before supersampling */
3240: sp->image = aa; /* replace chardef with ss image */
3241: if ( baseline >= height-1 ) /* baseline at bottom of char */
3242: sp->baseline = aa->height -1; /* so keep it at bottom */
3243: else /* char has descenders */
3244: sp->baseline /= shrinkfactor; /* rescale baseline */
3245: sp->type = IMAGERASTER; } /* character is an image raster */
3246: } /* --- end-of-if(issupersampling) --- */
3247: } /* --- end-of-if(sp!=NULL) --- */
3248: if ( msgfp!=NULL && msglevel>=999 )
3249: { fprintf(msgfp,"get_charsubraster> requested symbol=\"%s\" baseline=%d\n",
3250: symdef->symbol, (sp==NULL?0:sp->baseline)); fflush(msgfp); }
3251: return ( sp ); /* back to caller */
3252: } /* --- end-of-function get_charsubraster() --- */
3253:
3254:
3255: /* ==========================================================================
3256: * Function: get_baseline ( gfdata )
3257: * Purpose: returns baseline for a chardef struct
3258: * --------------------------------------------------------------------------
3259: * Arguments: gfdata (I) chardef * containing chardef for symbol
3260: * whose baseline is wanted
3261: * --------------------------------------------------------------------------
3262: * Returns: ( int ) baseline for symdef,
3263: * or -1 for any error
3264: * --------------------------------------------------------------------------
3265: * Notes: o Unlike TeX, the top-left corners of our rasters are (0,0),
3266: * with (row,col) increasing as you move down and right.
3267: * Baselines are calculated with respect to this scheme,
3268: * so 0 would mean the very top row is on the baseline
3269: * and everything else descends below the baseline.
3270: * ======================================================================= */
3271: /* --- entry point --- */
3272: int get_baseline ( chardef *gfdata )
3273: {
3274: /* -------------------------------------------------------------------------
3275: Allocations and Declarations
3276: -------------------------------------------------------------------------- */
3277: int /*toprow = gfdata->toprow,*/ /*TeX top row from .gf file info*/
3278: botrow = gfdata->botrow, /*TeX bottom row from .gf file info*/
3279: height = gfdata->image.height; /* #rows comprising symbol */
3280: /* -------------------------------------------------------------------------
3281: give caller baseline
3282: -------------------------------------------------------------------------- */
3283: return ( (height-1) + botrow ); /* note: descenders have botrow<0 */
3284: } /* --- end-of-function get_baseline() --- */
3285:
3286:
3287: /* ==========================================================================
3288: * Function: get_delim ( char *symbol, int height, int family )
3289: * Purpose: returns subraster corresponding to the samllest
3290: * character containing symbol, but at least as large as height,
3291: * and in caller's family (if specified).
3292: * If no symbol character as large as height is available,
3293: * then the largest availabale character is returned instead.
3294: * --------------------------------------------------------------------------
3295: * Arguments: symbol (I) char * containing (substring of) desired
3296: * symbol, e.g., if symbol="(", then any
3297: * mathchardef like "(" or "\\(", etc, match.
3298: * height (I) int containing minimum acceptable height
3299: * for returned character
3300: * family (I) int containing -1 to consider all families,
3301: * or, e.g., CMEX10 for only that family
3302: * --------------------------------------------------------------------------
3303: * Returns: ( subraster * ) best matching character available,
3304: * or NULL for any error
3305: * --------------------------------------------------------------------------
3306: * Notes: o If height is passed as negative, its absolute value is used
3307: * but the best-fit width is searched for (rather than height)
3308: * ======================================================================= */
3309: /* --- entry point --- */
3310: subraster *get_delim ( char *symbol, int height, int family )
3311: {
3312: /* -------------------------------------------------------------------------
3313: Allocations and Declarations
3314: -------------------------------------------------------------------------- */
3315: mathchardef *symdefs = symtable; /* table of mathchardefs */
3316: subraster *get_charsubraster(), *sp=(subraster *)NULL; /* best match char */
3317: subraster *make_delim(); /* construct delim if can't find it*/
3318: chardef *get_chardef(), *gfdata=NULL; /* get chardef struct for a symdef */
3319: char lcsymbol[256], *symptr, /* lowercase symbol for comparison */
3320: *unescsymbol = symbol; /* unescaped symbol */
3321: int symlen = (symbol==NULL?0:strlen(symbol)), /* #chars in caller's sym*/
3322: deflen = 0; /* length of symdef (aka lcsymbol) */
3323: int idef = 0, /* symdefs[] index */
3324: bestdef = (-9999), /* index of best fit symdef */
3325: bigdef = (-9999); /*index of biggest (in case no best)*/
3326: int size = 0, /* size index 0...LARGESTSIZE */
3327: bestsize = (-9999), /* index of best fit size */
3328: bigsize = (-9999); /*index of biggest (in case no best)*/
3329: int defheight, bestheight=9999, /* height of best fit symdef */
3330: bigheight = (-9999); /*height of biggest(in case no best)*/
3331: int iswidth = 0; /* true if best-fit width desired */
3332: int isunesc = 0, /* true if leading escape removed */
3333: issq=0, isoint=0; /* true for \sqcup,etc, \oint,etc */
3334: char *bigint="bigint", *bigoint="bigoint"; /* substitutes for int, oint */
3335: /* -------------------------------------------------------------------------
3336: determine if searching height or width, and search symdefs[] for best-fit
3337: -------------------------------------------------------------------------- */
3338: /* --- arg checks --- */
3339: if ( symlen < 1 ) return (sp); /* no input symbol suplied */
3340: if ( strcmp(symbol,"e") == 0 ) return(sp); /* e causes segfault??? */
3341: /* --- ignore leading escapes for CMEX10 --- */
3342: if ( 1 ) /* ignore leading escape */
3343: if ( (family==CMEX10 || family==CMSYEX) ) { /* for CMEX10 or CMSYEX */
3344: if ( strstr(symbol,"sq") != NULL ) /* \sq symbol requested */
3345: issq = 1; /* seq \sq signal */
3346: if ( strstr(symbol,"oint") != NULL ) /* \oint symbol requested */
3347: isoint = 1; /* seq \oint signal */
3348: if ( *symbol=='\\' ) /* have leading \ */
3349: { unescsymbol = symbol+1; /* push past leading \ */
3350: if ( --symlen < 1 ) return(sp); /* one less char */
3351: if ( strcmp(unescsymbol,"int") == 0 ) /* \int requested by caller */
3352: unescsymbol = bigint; /* but big version looks better */
3353: if ( strcmp(unescsymbol,"oint") == 0 ) /* \oint requested by caller */
3354: unescsymbol = bigoint; /* but big version looks better */
3355: symlen = strlen(unescsymbol); /* explicitly recalculate length */
3356: isunesc = 1; } /* signal leading escape removed */
3357: } /* --- end-of-if(family) --- */
3358: /* --- determine whether searching for best-fit height or width --- */
3359: if ( height < 0 ) /* negative signals width search */
3360: { height = (-height); /* flip "height" positive */
3361: iswidth = 1; } /* set flag for width search */
3362: /* --- search symdefs[] for best-fit height (or width) --- */
3363: for ( idef=0; ;idef++ ) /* until trailer record found */
3364: {
3365: char *defsym = symdefs[idef].symbol; /* local copies */
3366: int deffam = symdefs[idef].family;
3367: if ( defsym == NULL ) break; /* reached end-of-table */
3368: else /* check against caller's symbol */
3369: if ( family<0 || deffam == family /* if explicitly in caller's family*/
3370: || (family==CMSYEX && (deffam==CMSY10||deffam==CMEX10)) )
3371: {
3372: strcpy(lcsymbol,defsym); /* local copy of symdefs[] symbol */
3373: if ( isunesc && *lcsymbol=='\\' ) /* ignored leading \ in symbol */
3374: strcpy(lcsymbol,lcsymbol+1); /* so squeeze it out of lcsymbol too*/
3375: if ( 0 ) /* don't ignore case */
3376: for ( symptr=lcsymbol; *symptr!='\000'; symptr++ ) /*for each symbol ch*/
3377: if ( isalpha(*symptr) ) *symptr=tolower(*symptr); /*lowercase the char*/
3378: deflen = strlen(lcsymbol); /* #chars in symbol we're checking */
3379: if ((symptr=strstr(lcsymbol,unescsymbol)) != NULL) /*found caller's sym*/
3380: if ( (isoint || strstr(lcsymbol,"oint")==NULL) /* skip unwanted "oint"*/
3381: && (issq || strstr(lcsymbol,"sq")==NULL) ) /* skip unwanted "sq" */
3382: if ( (deffam == CMSY10 ? /* CMSY10 or not CMSY10 */
3383: symptr == lcsymbol /* caller's sym is a prefix */
3384: && deflen == symlen: /* and same length */
3385: symptr == lcsymbol /* caller's sym is a prefix */
3386: || symptr == lcsymbol+deflen-symlen) ) /* or a suffix */
3387: for ( size=0; size<=LARGESTSIZE; size++ ) /* check all font sizes */
3388: if ( (gfdata=get_chardef(&(symdefs[idef]),size)) != NULL ) /*got one*/
3389: { defheight = gfdata->image.height; /* height of this character */
3390: if ( iswidth ) /* width search wanted instead... */
3391: defheight = gfdata->image.width; /* ...so substitute width */
3392: leftsymdef = &(symdefs[idef]); /* set symbol class, etc */
3393: if ( defheight>=height && defheight<bestheight ) /*new best fit*/
3394: { bestdef=idef; bestsize=size; /* save indexes of best fit */
3395: bestheight = defheight; } /* and save new best height */
3396: if ( defheight >= bigheight ) /* new biggest character */
3397: { bigdef=idef; bigsize=size; /* save indexes of biggest */
3398: bigheight = defheight; } /* and save new big height */
3399: } /* --- end-of-if(gfdata!=NULL) --- */
3400: } /* --- end-of-if(family) --- */
3401: } /* --- end-of-for(idef) --- */
3402: /* -------------------------------------------------------------------------
3403: construct subraster for best fit character, and return it to caller
3404: -------------------------------------------------------------------------- */
3405: if ( bestdef >= 0 ) /* found a best fit for caller */
3406: sp = get_charsubraster(&(symdefs[bestdef]),bestsize); /* best subraster */
3407: if ( sp==NULL && height-bigheight>5 ) /* try to construct delim */
3408: sp = make_delim(symbol,(iswidth?-height:height)); /* try to build delim */
3409: if ( sp==NULL && bigdef>=0 ) /* just give biggest to caller */
3410: sp = get_charsubraster(&(symdefs[bigdef]),bigsize); /* biggest subraster */
3411: return ( sp );
3412: } /* --- end-of-function get_delim() --- */
3413:
3414:
3415: /* ==========================================================================
3416: * Function: make_delim ( char *symbol, int height )
3417: * Purpose: constructs subraster corresponding to symbol
3418: * exactly as large as height,
3419: * --------------------------------------------------------------------------
3420: * Arguments: symbol (I) char * containing, e.g., if symbol="("
3421: * for desired delimiter
3422: * height (I) int containing height
3423: * for returned character
3424: * --------------------------------------------------------------------------
3425: * Returns: ( subraster * ) constructed delimiter
3426: * or NULL for any error
3427: * --------------------------------------------------------------------------
3428: * Notes: o If height is passed as negative, its absolute value is used
3429: * and interpreted as width (rather than height)
3430: * ======================================================================= */
3431: /* --- entry point --- */
3432: subraster *make_delim ( char *symbol, int height )
3433: {
3434: /* -------------------------------------------------------------------------
3435: Allocations and Declarations
3436: -------------------------------------------------------------------------- */
3437: subraster *sp = (subraster *)NULL, /* subraster returned to caller */
3438: *new_subraster(); /* allocate subraster */
3439: raster *rasp = (raster *)NULL; /* sp->image */
3440: int isokay=0, delete_subraster(); /* set true if delimiter drawn ok */
3441: int pixsz = 1; /* pixels are one bit each */
3442: int thickness = 1; /* drawn lines are one pixel thick */
3443: int aspectratio = 8; /* default height/width for parens */
3444: int iswidth = 0, /*true if width specified by height*/
3445: width = height; /* #pixels width (e.g., of ellipse)*/
3446: char *lp=NULL, *rp=NULL, *strchr(), /* check symbol for left or right */
3447: *lp2=NULL, *rp2=NULL; /* synonym for lp,rp */
3448: int circle_raster(), /* ellipse for ()'s in sp->image */
3449: rule_rsater(), /* horizontal or vertical lines */
3450: line_raster(); /* line between two points */
3451: /* -------------------------------------------------------------------------
3452: initialization
3453: -------------------------------------------------------------------------- */
3454: /* --- determine whether constructing height or width --- */
3455: if ( height < 0 ) /* negative "height" signals width */
3456: { width = height = (-height); /* flip height positive */
3457: iswidth = 1; } /* set flag for width */
3458: if ( height < 3 ) goto end_of_job; /* too small, must be error */
3459: /* --- set default width (or height) accordingly --- */
3460: if ( iswidth ) height = (width+(aspectratio+1)/2)/aspectratio;
3461: else width = (height+(aspectratio+1)/2)/aspectratio;
3462: if ( strchr(symbol,'=') != NULL /* left or right || bracket wanted */
3463: || strstr(symbol,"\\|") != NULL ) /* same || in standard tex notation*/
3464: width = max2(width,5); /* need space between two |'s */
3465: if ( width < 2 ) width=2; /* set min width */
3466: if ( strchr(symbol,'(') != NULL /* if left ( */
3467: || strchr(symbol,')') != NULL ) /* or right ) paren wanted */
3468: width = (3*width)/2; /* adjust width */
3469: /* --- allocate and initialize subraster for constructed delimiter --- */
3470: if ( (sp=new_subraster(width,height,pixsz)) /* allocate new subraster */
3471: == NULL ) goto end_of_job; /* quit if failed */
3472: /* --- initialize delimiter subraster parameters --- */
3473: sp->type = IMAGERASTER; /* image */
3474: sp->symdef = NULL; /* not applicable for image */
3475: sp->baseline = height/2 + 2; /* is a little above center good? */
3476: sp->size = NORMALSIZE; /* size (probably unneeded) */
3477: rasp = sp->image; /* pointer to image in subraster */
3478: /* -------------------------------------------------------------------------
3479: ( ) parens
3480: -------------------------------------------------------------------------- */
3481: if ( (lp=strchr(symbol,'(')) != NULL /* left ( paren wanted */
3482: || (rp=strchr(symbol,')')) != NULL ) /* right ) paren wanted */
3483: {
3484: int mywidth = min2(width,20); /* max width for ()'s */
3485: circle_raster ( rasp, /* embedded raster image */
3486: 0, 0, /* row0,col0 are upper-left corner */
3487: height-1, mywidth-1, /* row1,col1 are lower-right */
3488: thickness, /* line thickness is 1 pixel */
3489: (rp==NULL?"23":"41") ); /* "1234" quadrants to be drawn */
3490: isokay = 1; /* set flag */
3491: } /* --- end-of-if(left- or right-() paren wanted) --- */
3492: /* -------------------------------------------------------------------------
3493: [ ] brackets
3494: -------------------------------------------------------------------------- */
3495: else
3496: if ( (lp=strchr(symbol,'[')) != NULL /* left [ bracket wanted */
3497: || (rp=strchr(symbol,']')) != NULL ) /* right ] bracket wanted */
3498: {
3499: /* --- rule_raster ( rasp, top, left, width, height, type=0 ) --- */
3500: int mywidth = min2(width,12); /* max width for horizontal bars */
3501: thickness = 1; /* set lines 1 or 2 pixels thick */
3502: rule_raster(rasp, 0,0, mywidth,thickness, 0); /* top horizontal bar */
3503: rule_raster(rasp, height-thickness,0, mywidth,thickness, 0); /* bottom */
3504: if ( lp != NULL ) /* left [ bracket wanted */
3505: rule_raster(rasp, 0,0, thickness,height, 0); /* left vertical bar */
3506: if ( rp != NULL ) /* right ] bracket wanted */
3507: rule_raster(rasp, 0,mywidth-thickness, thickness,height, 0); /* right */
3508: isokay = 1; /* set flag */
3509: } /* --- end-of-if(left- or right-[] bracket wanted) --- */
3510: /* -------------------------------------------------------------------------
3511: < > brackets
3512: -------------------------------------------------------------------------- */
3513: else
3514: if ( (lp=strchr(symbol,'<')) != NULL /* left < bracket wanted */
3515: || (rp=strchr(symbol,'>')) != NULL ) /* right > bracket wanted */
3516: {
3517: /* --- line_raster ( rasp, row0, col0, row1, col1, thickness ) --- */
3518: int mywidth = min2(width,12); /* max width for brackets */
3519: thickness = 1; /* set line pixel thickness */
3520: if ( lp != NULL ) /* left < bracket wanted */
3521: { line_raster(rasp,height/2,0,0,mywidth-1,thickness);
3522: line_raster(rasp,height/2,0,height-1,mywidth-1,thickness); }
3523: if ( rp != NULL ) /* right > bracket wanted */
3524: { line_raster(rasp,height/2,mywidth-1,0,0,thickness);
3525: line_raster(rasp,height/2,mywidth-1,height-1,0,thickness); }
3526: isokay = 1; /* set flag */
3527: } /* --- end-of-if(left- or right-<> bracket wanted) --- */
3528: /* -------------------------------------------------------------------------
3529: \- for | | brackets or \= for || || brackets
3530: -------------------------------------------------------------------------- */
3531: else
3532: if ( (lp=strchr(symbol,'-')) != NULL /* left or right | bracket wanted */
3533: || (lp2=strchr(symbol,'|')) != NULL /* synonym for | bracket */
3534: || (rp=strchr(symbol,'=')) != NULL /* left or right || bracket wanted */
3535: || (rp2=strstr(symbol,"\\|"))!= NULL ) /* || in standard tex notation */
3536: {
3537: /* --- rule_raster ( rasp, top, left, width, height, type=0 ) --- */
3538: int midcol = width/2; /* middle col, left of mid if even */
3539: if ( rp != NULL /* left or right || bracket wanted */
3540: || rp2 != NULL ) /* or || in standard tex notation */
3541: { thickness = 1; /* each | of || one pixel thick */
3542: rule_raster(rasp, 0,max2(0,midcol-2), thickness,height, 0); /* left */
3543: rule_raster(rasp, 0,min2(width,midcol+2), thickness,height, 0); }
3544: else /*nb, lp2 spuriously set if rp2 set*/
3545: if ( lp != NULL /* left or right | bracket wanted */
3546: || lp2 != NULL ) /* ditto for synomym */
3547: { thickness = 1; /* set | two pixels thick */
3548: rule_raster(rasp, 0,midcol, thickness,height, 0); } /*mid vertical bar*/
3549: isokay = 1; /* set flag */
3550: } /* --- end-of-if(left- or right-[] bracket wanted) --- */
3551: /* -------------------------------------------------------------------------
3552: back to caller
3553: -------------------------------------------------------------------------- */
3554: end_of_job:
3555: if ( !isokay ) /* don't have requested delimiter */
3556: { delete_subraster(sp); /* so free unneeded structure */
3557: sp = NULL; } /* and signal error to caller */
3558: return ( sp ); /*back to caller with delim or NULL*/
3559: } /* --- end-of-function make_delim() --- */
3560:
3561:
3562: /* ==========================================================================
3563: * Function: texchar ( expression, chartoken )
3564: * Purpose: scans expression, returning either its first character,
3565: * or the next \sequence if that first char is \,
3566: * and a pointer to the first expression char past that.
3567: * --------------------------------------------------------------------------
3568: * Arguments: expression (I) char * to first char of null-terminated
3569: * string containing valid LaTeX expression
3570: * to be scanned
3571: * chartoken (O) char * to null-terminated string returning
3572: * either the first (non-whitespace) character
3573: * of expression if that char isn't \, or else
3574: * the \ and everything following it up to
3575: * the next non-alphabetic character (but at
3576: * least one char following the \ even if
3577: * it's non-alpha)
3578: * --------------------------------------------------------------------------
3579: * Returns: ( char * ) ptr to the first char of expression
3580: * past returned chartoken,
3581: * or NULL for any parsing error.
3582: * --------------------------------------------------------------------------
3583: * Notes: o Does *not* skip leading whitespace, but simply
3584: * returns any whitespace character as the next character.
3585: * ======================================================================= */
3586: /* --- entry point --- */
3587: char *texchar ( char *expression, char *chartoken )
3588: {
3589: /* -------------------------------------------------------------------------
3590: Allocations and Declarations
3591: -------------------------------------------------------------------------- */
3592: int esclen = 0, /*length of escape sequence*/
3593: maxesclen = 128; /* max len of esc sequence */
3594: char *ptoken = chartoken; /* ptr into chartoken */
3595: int iprefix = 0; /* prefix index */
3596: static char *prefixes[] = /*e.g., \big followed by ( */
3597: { /* "\\left", "\\right", */
3598: "\\big", "\\Big", "\\bigg", "\\Bigg",
3599: "\\bigl", "\\Bigl", "\\biggl", "\\Biggl",
3600: "\\bigr", "\\Bigr", "\\biggr", "\\Biggr", NULL };
3601: /* -------------------------------------------------------------------------
3602: just return the next char if it's not \
3603: -------------------------------------------------------------------------- */
3604: /* --- error check for end-of-string --- */
3605: *ptoken = '\000'; /* init in case of error */
3606: if ( expression == NULL ) return(NULL); /* nothing to scan */
3607: if ( *expression == '\000' ) return(NULL); /* nothing to scan */
3608: /* --- always returning first character (either \ or some other char) --- */
3609: *ptoken++ = *expression++; /* here's first character */
3610: /* --- if first char isn't \, then just return it to caller --- */
3611: if ( !isthischar(*(expression-1),ESCAPE) ) /* not a \, so return char */
3612: { *ptoken = '\000'; /* add a null terminator */
3613: goto end_of_job; } /* ptr past returned char */
3614: if ( *expression == '\000' ) /* \ is very last char */
3615: { *chartoken = '\000'; /* flush bad trailing \ */
3616: return(NULL); } /* and signal end-of-job */
3617: /* -------------------------------------------------------------------------
3618: we have an escape sequence, so return all alpha chars following \
3619: -------------------------------------------------------------------------- */
3620: /* --- accumulate chars until first non-alpha char found --- */
3621: for ( ; isalpha(*expression); esclen++ ) /* till first non-alpha... */
3622: { if ( esclen < maxesclen-3 ) /* more room in chartoken */
3623: *ptoken++ = *expression; /*copy alpha char, bump ptr*/
3624: expression++; } /* bump expression ptr */
3625: /* --- if we have a prefix, append next texchar, e.g., \big( --- */
3626: *ptoken = '\000'; /* set null for compare */
3627: for ( iprefix=0; prefixes[iprefix] != NULL; iprefix++ ) /* run thru list */
3628: if ( strcmp(chartoken,prefixes[iprefix]) == 0 ) /* have an exact match */
3629: { char nextchar[256]; int nextlen=0; /* texchar after prefix */
3630: skipwhite(expression); /* skip space after prefix*/
3631: expression = texchar(expression,nextchar); /* get nextchar */
3632: if ( (nextlen = strlen(nextchar)) > 0 ) /* #chars in nextchar */
3633: { strcpy(ptoken,nextchar); /* append nextchar */
3634: ptoken += strlen(nextchar); /* point to null terminator*/
3635: esclen += strlen(nextchar); } /* and bump escape length */
3636: break; } /* stop checking prefixes */
3637: /* --- every \ must be followed by at least one char, e.g., \[ --- */
3638: if ( esclen < 1 ) /* \ followed by non-alpha */
3639: *ptoken++ = *expression++; /*copy non-alpha, bump ptrs*/
3640: else { /* normal alpha \sequence */
3641: /* --- respect spaces in text mode, except first space after \escape --- */
3642: if ( istext > 0 ) /* in \rm or \it text mode */
3643: if ( istext != 3 ) /* but not \mathbb */
3644: if ( isthischar(*expression,WHITEDELIM) ) /* delim follows \sequence */
3645: expression++; } /* so flush delim */
3646: *ptoken = '\000'; /* null-terminate token */
3647: /* --- back to caller --- */
3648: end_of_job:
3649: if ( msgfp!=NULL && msglevel>=999 )
3650: { fprintf(msgfp,"texchar> returning token = \"%s\"\n",chartoken);
3651: fflush(msgfp); }
3652: return ( expression ); /*ptr to 1st non-alpha char*/
3653: } /* --- end-of-function texchar() --- */
3654:
3655:
3656: /* ==========================================================================
3657: * Function: texsubexpr (expression,subexpr,maxsubsz,
3658: * left,right,isescape,isdelim)
3659: * Purpose: scans expression, returning everything between a balanced
3660: * left{...right} subexpression if the first non-whitespace
3661: * char of expression is an (escaped or unescaped) left{,
3662: * or just the next texchar() otherwise,
3663: * and a pointer to the first expression char past that.
3664: * --------------------------------------------------------------------------
3665: * Arguments: expression (I) char * to first char of null-terminated
3666: * string containing valid LaTeX expression
3667: * to be scanned
3668: * subexpr (O) char * to null-terminated string returning
3669: * either everything between a balanced {...}
3670: * subexpression if the first char is {,
3671: * or the next texchar() otherwise.
3672: * maxsubsz (I) int containing max #bytes returned
3673: * in subexpr buffer (0 means unlimited)
3674: * left (I) char * specifying allowable left delimiters
3675: * that begin subexpression, e.g., "{[(<"
3676: * right (I) char * specifying matching right delimiters
3677: * in the same order as left, e.g., "}])>"
3678: * isescape (I) int controlling whether escaped and/or
3679: * unescaped left,right are matched;
3680: * see isbrace() comments below for details.
3681: * isdelim (I) int containing true (non-zero) to return
3682: * the leading left and trailing right delims
3683: * (if any were found) along with subexpr,
3684: * or containing false=0 to return subexpr
3685: * without its delimiters
3686: * --------------------------------------------------------------------------
3687: * Returns: ( char * ) ptr to the first char of expression
3688: * past returned subexpr (see Notes),
3689: * or NULL for any parsing error.
3690: * --------------------------------------------------------------------------
3691: * Notes: o If subexpr is of the form left{...right},
3692: * the outer {}'s are returned as part of subexpr
3693: * if isdelim is true; if isdelim is false the {}'s aren't
3694: * returned. In either case the returned pointer is
3695: * *always* bumped past the closing right}, even if
3696: * that closing right} isn't returned in subexpr.
3697: * o If subexpr is not of the form left{...right},
3698: * the returned pointer is on the character immediately
3699: * following the last character returned in subexpr
3700: * o \. acts as LaTeX \right. and matches any \left(
3701: * And it also acts as a LaTeX \left. and matches any \right)
3702: * ======================================================================= */
3703: /* --- entry point --- */
3704: char *texsubexpr ( char *expression, char *subexpr, int maxsubsz,
3705: char *left, char *right, int isescape, int isdelim )
3706: {
3707: /* -------------------------------------------------------------------------
3708: Allocations and Declarations
3709: -------------------------------------------------------------------------- */
3710: char *texchar(); /*next char (or \sequence) from expression*/
3711: char *leftptr, leftdelim[32] = "(\000", /* left( found in expression */
3712: rightdelim[32] = ")\000"; /* and matching right) */
3713: char *origexpression=expression, *origsubexpr=subexpr; /*original inputs*/
3714: int gotescape = 0, /* true if leading char of expression is \ */
3715: prevescape = 0; /* while parsing, true if preceding char \ */
3716: int isbrace(); /* check for left,right braces */
3717: int isanyright = 1; /* true matches any right with left, (...] */
3718: int isleftdot = 0; /* true if left brace is a \. */
3719: int nestlevel = 1; /* current # of nested braces */
3720: int subsz=0 /*, maxsubsz=8192*/; /* #chars in returned subexpr[] buffer*/
3721: /* -------------------------------------------------------------------------
3722: skip leading whitespace and just return the next char if it's not {
3723: -------------------------------------------------------------------------- */
3724: /* --- skip leading whitespace and error check for end-of-string --- */
3725: *subexpr = '\000'; /* init in case of error */
3726: if ( expression == NULL ) return(NULL); /*can't dereference null ptr*/
3727: skipwhite(expression); /* leading whitespace gone */
3728: if ( *expression == '\000' ) return(NULL); /* nothing left to scan */
3729: /* --- set maxsubsz --- */
3730: if ( maxsubsz < 1 ) maxsubsz = 8192; /* input 0 means unlimited */
3731: /* --- check for escape --- */
3732: if ( isthischar(*expression,ESCAPE) ) /* expression is escaped */
3733: gotescape = 1; /* so set flag accordingly */
3734: /* --- if first char isn't left{ or script, just return it to caller --- */
3735: if ( !isbrace(expression,left,isescape) ) /* not a left{ */
3736: if ( !isthischar(*expression,SCRIPTS) ) /* and not a script */
3737: return ( texchar(expression,subexpr) ); /* next char to caller */
3738: else /* --- kludge for super/subscripts to accommodate texscripts() --- */
3739: { *subexpr++ = *expression; /* signal script */
3740: *subexpr = '\000'; /* null-terminate subexpr */
3741: return ( expression ); } /* leave script in stream */
3742: /* --- extract left and find matching right delimiter --- */
3743: *leftdelim = *(expression+gotescape); /* the left( in expression */
3744: if ( (gotescape && *leftdelim == '.') /* we have a left \. */
3745: || (gotescape && isanyright) ) /*or are matching any right*/
3746: { isleftdot = 1; /* so just set flag */
3747: *leftdelim = '\000'; } /* and reset leftdelim */
3748: else /* find matching \right */
3749: if ( (leftptr=strchr(left,*leftdelim)) != NULL ) /* ptr to that left( */
3750: *rightdelim = right[(int)(leftptr-left)]; /* get the matching right) */
3751: else /* can't happen -- pgm bug */
3752: return ( NULL ); /*just signal eoj to caller*/
3753: /* -------------------------------------------------------------------------
3754: accumulate chars between balanced {}'s, i.e., till nestlevel returns to 0
3755: -------------------------------------------------------------------------- */
3756: /* --- first initialize by bumping past left{ or \{ --- */
3757: if ( isdelim ) *subexpr++ = *expression++; /*caller wants { in subexpr*/
3758: else expression++; /* always bump past left{ */
3759: if ( gotescape ) /*need to bump another char*/
3760: if ( isdelim ) *subexpr++ = *expression++; /* caller wants char, too */
3761: else expression++; /* else just bump past it */
3762: /* --- set maximum size for numerical arguments --- */
3763: if ( 0 ) /* check turned on or off? */
3764: if ( !isescape && !isdelim ) /*looking for numerical arg*/
3765: maxsubsz = 96; /* set max arg size */
3766: /* --- search for matching right} --- */
3767: while ( 1 ) /*until balanced right} */
3768: {
3769: /* --- error check for end-of-string --- */
3770: if ( *expression == '\000' ) /* premature end-of-string */
3771: { if ( 0 && (!isescape && !isdelim) ) /*looking for numerical arg,*/
3772: { expression = origexpression; /* so end-of-string is error*/
3773: subexpr = origsubexpr; } /* so reset all ptrs */
3774: if ( isdelim ) /* generate fake right */
3775: if ( gotescape ) /* need escaped right */
3776: { *subexpr++ = '\\'; /* set escape char */
3777: *subexpr++ = '.'; } /* and fake \right. */
3778: else /* escape not wanted */
3779: *subexpr++ = *rightdelim; /* so fake actual right */
3780: *subexpr = '\000'; /* null-terminate subexpr */
3781: return ( expression ); } /* back with final token */
3782: /* --- check preceding char for escape --- */
3783: if ( isthischar(*(expression-1),ESCAPE) ) /* previous char was \ */
3784: prevescape = 1-prevescape; /* so flip escape flag */
3785: else prevescape = 0; /* or turn flag off */
3786: /* --- check for { and } (un/escaped as per leading left) --- */
3787: if ( gotescape == prevescape ) /* escaped iff leading is */
3788: { /* --- check for (closing) right delim and see if we're done --- */
3789: if ( isthischar(*expression,rightdelim) /* found a right} */
3790: || (isleftdot && isthischar(*expression,right)) /*\left. matches all*/
3791: || (prevescape && isthischar(*expression,".")) ) /*or found \right. */
3792: if ( --nestlevel < 1 ) /*\right balances 1st \left*/
3793: { if ( isdelim ) /*caller wants } in subexpr*/
3794: *subexpr++ = *expression; /* so end subexpr with } */
3795: else /*check for \ before right}*/
3796: if ( prevescape ) /* have unwanted \ */
3797: *(subexpr-1) = '\000'; /* so replace it with null */
3798: *subexpr = '\000'; /* null-terminate subexpr */
3799: return ( expression+1 ); } /* back with char after } */
3800: /* --- check for (another) left{ --- */
3801: if ( isthischar(*expression,leftdelim) /* found another left{ */
3802: || (isleftdot && isthischar(*expression,left)) ) /* any left{ */
3803: nestlevel++;
3804: } /* --- end-of-if(gotescape==prevescape) --- */
3805: /* --- not done, so copy char to subexpr and continue with next char --- */
3806: if ( ++subsz < maxsubsz-5 ) /* more room in subexpr */
3807: *subexpr++ = *expression; /* so copy char and bump ptr*/
3808: expression++; /* bump expression ptr */
3809: } /* --- end-of-while(1) --- */
3810: } /* --- end-of-function texsubexpr() --- */
3811:
3812:
3813: /* ==========================================================================
3814: * Function: texscripts ( expression, subscript, superscript, which )
3815: * Purpose: scans expression, returning subscript and/or superscript
3816: * if expression is of the form _x^y or ^{x}_{y},
3817: * or any (valid LaTeX) permutation of the above,
3818: * and a pointer to the first expression char past "scripts"
3819: * --------------------------------------------------------------------------
3820: * Arguments: expression (I) char * to first char of null-terminated
3821: * string containing valid LaTeX expression
3822: * to be scanned
3823: * subscript (O) char * to null-terminated string returning
3824: * subscript (without _), if found, or "\000"
3825: * superscript (O) char * to null-terminated string returning
3826: * superscript (without ^), if found, or "\000"
3827: * which (I) int containing 1 for subscript only,
3828: * 2 for superscript only, >=3 for either/both
3829: * --------------------------------------------------------------------------
3830: * Returns: ( char * ) ptr to the first char of expression
3831: * past returned "scripts" (unchanged
3832: * except for skipped whitespace if
3833: * neither subscript nor superscript found),
3834: * or NULL for any parsing error.
3835: * --------------------------------------------------------------------------
3836: * Notes: o an input expression like ^a^b_c will return superscript="b",
3837: * i.e., totally ignoring all but the last "script" encountered
3838: * ======================================================================= */
3839: /* --- entry point --- */
3840: char *texscripts ( char *expression, char *subscript,
3841: char *superscript, int which )
3842: {
3843: /* -------------------------------------------------------------------------
3844: Allocations and Declarations
3845: -------------------------------------------------------------------------- */
3846: char *texsubexpr(); /* next subexpression from expression */
3847: int gotsub=0, gotsup=0; /* check that we don't eat, e.g., x_1_2 */
3848: /* -------------------------------------------------------------------------
3849: init "scripts" and skip leading whitespace
3850: -------------------------------------------------------------------------- */
3851: /* --- skip leading whitespace and check for end-of-string --- */
3852: *subscript = *superscript = '\000'; /* init in case no scripts */
3853: skipwhite(expression); /* leading whitespace gone */
3854: if ( *expression == '\000' ) return(expression); /* nothing left to scan */
3855: /* -------------------------------------------------------------------------
3856: get subscript and/or superscript from expression
3857: -------------------------------------------------------------------------- */
3858: while ( expression != NULL )
3859: if ( isthischar(*expression,SUBSCRIPT) /* found _ */
3860: && (which==1 || which>2 ) ) /* and caller wants it */
3861: { if ( gotsub /* found 2nd subscript */
3862: || subscript == NULL ) break; /* or no subscript buffer */
3863: gotsub = 1; /* set subscript flag */
3864: expression = texsubexpr(expression+1,subscript,0,"{","}",0,0); }
3865: else /* no _, check for ^ */
3866: if ( isthischar(*expression,SUPERSCRIPT) /* found ^ */
3867: && which>=2 ) /* and caller wants it */
3868: { if ( gotsup /* found 2nd superscript */
3869: || superscript == NULL ) break; /* or no superscript buffer*/
3870: gotsup = 1; /* set superscript flag */
3871: expression = texsubexpr(expression+1,superscript,0,"{","}",0,0); }
3872: else /* neither _ nor ^ */
3873: return ( expression ); /*return ptr past "scripts"*/
3874: return ( expression );
3875: } /* --- end-of-function texscripts() --- */
3876:
3877:
3878: /* ==========================================================================
3879: * Function: isbrace ( expression, braces, isescape )
3880: * Purpose: checks leading char(s) of expression for a brace,
3881: * either escaped or unescaped depending on isescape,
3882: * except that { and } are always matched, if they're
3883: * in braces, regardless of isescape.
3884: * --------------------------------------------------------------------------
3885: * Arguments: expression (I) char * to first char of null-terminated
3886: * string containing a valid LaTeX expression
3887: * whose leading char(s) are checked for braces
3888: * that begin subexpression, e.g., "{[(<"
3889: * braces (I) char * specifying matching brace delimiters
3890: * to be checked for, e.g., "{[(<" or "}])>"
3891: * isescape (I) int containing 0 to match only unescaped
3892: * braces, e.g., (...) or {...}, etc,
3893: * or containing 1 to match only escaped
3894: * braces, e.g., \(...\) or \[...\], etc,
3895: * or containing 2 to match either.
3896: * But note: if {,} are in braces
3897: * then they're *always* matched whether
3898: * escaped or not, regardless of isescape.
3899: * --------------------------------------------------------------------------
3900: * Returns: ( int ) 1 if the leading char(s) of expression
3901: * is a brace, or 0 if not.
3902: * --------------------------------------------------------------------------
3903: * Notes: o
3904: * ======================================================================= */
3905: /* --- entry point --- */
3906: int isbrace ( char *expression, char *braces, int isescape )
3907: {
3908: /* -------------------------------------------------------------------------
3909: Allocations and Declarations
3910: -------------------------------------------------------------------------- */
3911: int gotescape = 0, /* true if leading char is an escape */
3912: gotbrace = 0; /*true if first non-escape char is a brace*/
3913: /* -------------------------------------------------------------------------
3914: check for brace
3915: -------------------------------------------------------------------------- */
3916: /* --- first check for end-of-string --- */
3917: if ( *expression == '\000' ) return(0); /* nothing to check */
3918: /* --- check leading char for escape --- */
3919: if ( isthischar(*expression,ESCAPE) ) /* expression is escaped */
3920: { gotescape = 1; /* so set flag accordingly */
3921: expression++; } /* and bump past escape */
3922: /* --- check (maybe next char) for brace --- */
3923: if ( isthischar(*expression,braces) ) /* expression is braced */
3924: gotbrace = 1; /* so set flag accordingly */
3925: if ( gotescape && *expression == '.' ) /* \. matches any brace */
3926: gotbrace = 1; /* set flag */
3927: /* --- check for TeX brace { or } --- */
3928: if ( gotbrace && isthischar(*expression,"{}") ) /*expression has TeX brace*/
3929: if ( isescape ) isescape = 2; /* reset escape flag */
3930: /* -------------------------------------------------------------------------
3931: back to caller
3932: -------------------------------------------------------------------------- */
3933: if ( gotbrace && /* found a brace */
3934: ( isescape==2 || /* escape irrelevant */
3935: gotescape==isescape ) /* un/escaped as requested */
3936: ) return ( 1 ); return ( 0 ); /* return 1,0 accordingly */
3937: } /* --- end-of-function isbrace() --- */
3938:
3939:
3940: /* ==========================================================================
3941: * Function: preamble ( expression, size, subexpr )
3942: * Purpose: parses $-terminated preamble, if present, at beginning
3943: * of expression, re-setting size if necessary, and
3944: * returning any other parameters besides size in subexpr.
3945: * --------------------------------------------------------------------------
3946: * Arguments: expression (I) char * to first char of null-terminated
3947: * string containing LaTeX expression possibly
3948: * preceded by $-terminated preamble
3949: * size (I/O) int * containing 0-4 default font size,
3950: * and returning size modified by first
3951: * preamble parameter (or unchanged)
3952: * subexpr(O) char * returning any remaining preamble
3953: * parameters past size
3954: * --------------------------------------------------------------------------
3955: * Returns: ( char * ) ptr to first char past preamble in expression
3956: * or NULL for any parsing error.
3957: * --------------------------------------------------------------------------
3958: * Notes: o size can be any number >=0. If preceded by + or -, it's
3959: * interpreted as an increment to input size; otherwise
3960: * it's interpreted as the size.
3961: * o if subexpr is passed as NULL ptr, then returned expression
3962: * ptr will have "flushed" and preamble parameters after size
3963: * ======================================================================= */
3964: /* --- entry point --- */
3965: char *preamble ( char *expression, int *size, char *subexpr )
3966: {
3967: /* -------------------------------------------------------------------------
3968: Allocations and Declarations
3969: -------------------------------------------------------------------------- */
3970: char pretext[512], *prep=expression, /*pream from expression, ptr into it*/
3971: *dollar, *comma; /* preamble delimiters */
3972: int prelen = 0, /* preamble length */
3973: sizevalue = 0, /* value of size parameter */
3974: isfontsize = 0, /*true if leading fontsize present*/
3975: isdelta = 0; /*true to increment passed size arg*/
3976: /* -------------------------------------------------------------------------
3977: initialization
3978: -------------------------------------------------------------------------- */
3979: if ( subexpr != NULL ) /* caller passed us an address */
3980: *subexpr = '\000'; /* so init assuming no preamble */
3981: if ( expression == NULL ) goto end_of_job; /* no input */
3982: if ( *expression == '\000' ) goto end_of_job; /* input is an empty string */
3983: /* -------------------------------------------------------------------------
3984: process preamble if present
3985: -------------------------------------------------------------------------- */
3986: /*process_preamble:*/
3987: if ( (dollar=strchr(expression,'$')) /* $ signals preceding preamble */
3988: != NULL ) /* found embedded $ */
3989: if ( (prelen = (int)(dollar-expression)) /*#chars in expression preceding $*/
3990: > 0 ) { /* must have preamble preceding $ */
3991: if ( prelen < 65 ) { /* too long for a prefix */
3992: memcpy(pretext,expression,prelen); /* local copy of preamble */
3993: pretext[prelen] = '\000'; /* null-terminated */
3994: if ( strchr(pretext,*(ESCAPE))==NULL /*shouldn't be an escape in preamble*/
3995: && strchr(pretext,'{') == NULL ) { /*shouldn't be a left{ in preamble*/
3996: /* --- skip any leading whitespace --- */
3997: prep = pretext; /* start at beginning of preamble */
3998: skipwhite(prep); /* skip any leading white space */
3999: /* --- check for embedded , or leading +/- (either signalling size) --- */
4000: if ( isthischar(*prep,"+-") ) /* have leading + or - */
4001: isdelta = 1; /* so use size value as increment */
4002: comma = strchr(pretext,','); /* , signals leading size param */
4003: /* --- process leading size parameter if present --- */
4004: if ( comma != NULL /* size param explicitly signalled */
4005: || isdelta || isdigit(*prep) ) { /* or inferred implicitly */
4006: /* --- parse size parameter and reset size accordingly --- */
4007: if( comma != NULL ) *comma = '\000';/*, becomes null, terminating size*/
4008: sizevalue = atoi(prep); /* convert size string to integer */
4009: if ( size != NULL ) /* caller passed address for size */
4010: *size = (isdelta? *size+sizevalue : sizevalue); /* so reset size */
4011: /* --- finally, set flag and shift size parameter out of preamble --- */
4012: isfontsize = 1; /*set flag showing font size present*/
4013: if ( comma != NULL ) strcpy(pretext,comma+1);/*leading size param gone*/
4014: } /* --- end-of-if(comma!=NULL||etc) --- */
4015: /* --- copy any preamble params following size to caller's subexpr --- */
4016: if ( comma != NULL || !isfontsize ) /*preamb contains params past size*/
4017: if ( subexpr != NULL ) /* caller passed us an address */
4018: strcpy(subexpr,pretext); /*so return extra params to caller*/
4019: /* --- finally, set prep to shift preamble out of expression --- */
4020: prep = expression + prelen+1; /* set prep past $ in expression */
4021: } /* --- end-of-if(strchr(pretext,*ESCAPE)==NULL) --- */
4022: } /* --- end-of-if(prelen<65) --- */
4023: } /* --- end-of-if(prelen>0) --- */
4024: else { /* $ is first char of expression */
4025: int ndollars = 0; /* number of $...$ pairs removed */
4026: prep = expression; /* start at beginning of expression*/
4027: while ( *prep == '$' ) { /* remove all matching $...$'s */
4028: int explen = strlen(prep)-1; /* index of last char in expression*/
4029: if ( explen < 2 ) break; /* no $...$'s left to remove */
4030: if ( prep[explen] != '$' ) break; /* unmatched $ */
4031: prep[explen] = '\000'; /* remove trailing $ */
4032: prep++; /* and remove matching leading $ */
4033: ndollars++; /* count another pair removed */
4034: } /* --- end-of-while(*prep=='$') --- */
4035: ispreambledollars = ndollars; /* set flag to fix \displaystyle */
4036: if ( ndollars == 1 ) /* user submitted $...$ expression */
4037: isdisplaystyle = 0; /* so set \textstyle */
4038: if ( ndollars > 1 ) /* user submitted $$...$$ */
4039: isdisplaystyle = 2; /* so set \displaystyle */
4040: /*goto process_preamble;*/ /*check for preamble after leading $*/
4041: } /* --- end-of-if/else(prelen>0) --- */
4042: /* -------------------------------------------------------------------------
4043: back to caller
4044: -------------------------------------------------------------------------- */
4045: end_of_job:
4046: return ( prep ); /*expression, or ptr past preamble*/
4047: } /* --- end-of-function preamble() --- */
4048:
4049:
4050: /* ==========================================================================
4051: * Function: mimeprep ( expression )
4052: * Purpose: preprocessor for mimeTeX input, e.g.,
4053: * (a) removes comments,
4054: * (b) converts \left( to \( and \right) to \),
4055: * (c) xlates &html; special chars to equivalent latex
4056: * Should only be called once (after unescape_url())
4057: * --------------------------------------------------------------------------
4058: * Arguments: expression (I/O) char * to first char of null-terminated
4059: * string containing mimeTeX/LaTeX expression,
4060: * and returning preprocessed string
4061: * --------------------------------------------------------------------------
4062: * Returns: ( char * ) ptr to input expression,
4063: * or NULL for any parsing error.
4064: * --------------------------------------------------------------------------
4065: * Notes: o
4066: * ======================================================================= */
4067: /* --- entry point --- */
4068: char *mimeprep ( char *expression )
4069: {
4070: /* -------------------------------------------------------------------------
4071: Allocations and Declarations
4072: -------------------------------------------------------------------------- */
4073: char *expptr=expression, /* ptr within expression */
4074: *tokptr=NULL, /*ptr to token found in expression*/
4075: *texsubexpr(), argval[8192]; /*parse for macro args after token*/
4076: char *strchange(); /* change leading chars of string */
4077: char *findbraces(); /*find left { and right } for \atop*/
4078: int idelim=0, /* left- or right-index */
4079: isymbol=0; /*symbols[],rightcomment[],etc index*/
4080: int xlateleft = 0; /* true to xlate \left and \right */
4081: /* ---
4082: * comments
4083: * -------- */
4084: char *leftptr=NULL; /* find leftcomment in expression */
4085: static char *leftcomment = "%%", /* open comment */
4086: *rightcomment[] = {"\n", "%%", NULL}; /* close comments */
4087: /* ---
4088: * special long (more than 1-char) \left and \right delimiters
4089: * ----------------------------------------------------------- */
4090: static char *leftfrom[] = /* xlate any \left suffix... */
4091: { "\\|", /* \left\| */
4092: "\\{", /* \left\{ */
4093: "\\langle", /* \left\langle */
4094: NULL } ; /* --- end-of-leftfrom[] --- */
4095: static char *leftto[] = /* ...to this instead */
4096: { "=", /* = */
4097: "{", /* { */
4098: "<", /* < */
4099: NULL } ; /* --- end-of-leftto[] --- */
4100: static char *rightfrom[] = /* xlate any \right suffix... */
4101: { "\\|", /* \right\| */
4102: "\\}", /* \right\} */
4103: "\\rangle", /* \right\rangle */
4104: NULL } ; /* --- end-of-rightfrom[] --- */
4105: static char *rightto[] = /* ...to this instead */
4106: { "=", /* = */
4107: "}", /* } */
4108: ">", /* > */
4109: NULL } ; /* --- end-of-rightto[] --- */
4110: /* ---
4111: * { \atop }-like commands
4112: * ----------------------- */
4113: char *atopsym=NULL; /* atopcommands[isymbol] */
4114: static char *atopcommands[] = /* list of {a+b\command c+d}'s */
4115: { "\\over", /* plain tex for \frac */
4116: "\\choose", /* binomial coefficient */
4117: #ifndef NOATOP /*noatop preserves old mimeTeX rule*/
4118: "\\atop",
4119: #endif
4120: NULL } ; /* --- end-of-atopcommands[] --- */
4121: static char *atopdelims[] = /* delims for atopcommands[] */
4122: { NULL, NULL, /* \\over has no delims */
4123: "\\left(", "\\right)", /* \\choose has ( ) delims*/
4124: #ifndef NOATOP /*noatop preserves old mimeTeX rule*/
4125: NULL, NULL, /* \\atop has no delims */
4126: #endif
4127: NULL, NULL } ; /* --- end-of-atopdelims[] --- */
4128: /* ---
4129: * html special/escape chars converted to latex equivalents
4130: * -------------------------------------------------------- */
4131: char *htmlsym=NULL; /* symbols[isymbol].html */
4132: static struct { char *html; char *args; char *latex; } symbols[] =
4133: { /* ---------------------------------------
4134: user-supplied newcommands
4135: --------------------------------------- */
4136: #ifdef NEWCOMMANDS /* -DNEWCOMMANDS=\"filename.h\" */
4137: #include NEWCOMMANDS
4138: #endif
4139: /* ------------------------------------------
4140: LaTeX Macro #args,default template...
4141: ------------------------------------------ */
4142: { "\\lvec", "2n", "{#2_1,\\cdots,#2_{#1}}" },
4143: { "\\overset", NULL, "\\stackrel" }, /* just an alias */
4144: { "\\underset", "2", "\\relstack{#2}{#1}" }, /* reverse args */
4145: /* ---------------------------------------
4146: html termchar LaTeX equivalent...
4147: --------------------------------------- */
4148: { """, ";", "\"" }, /* " is first, " */
4149: { "&", ";", "&" },
4150: { "<", ";", "<" },
4151: { ">", ";", ">" },
4152: { " ", ";", "~" },
4153: { "¡", ";", "{\\raisebox{-2}{\\rotatebox{180}{!}}}" },
4154: { "¦", ";", "|" },
4155: { "±", ";", "\\pm" },
4156: { "²", ";", "{{}^2}" },
4157: { "³", ";", "{{}^3}" },
4158: { "µ", ";", "\\mu" },
4159: { "¹", ";", "{{}^1}" },
4160: { "¼", ";", "{\\frac14}" },
4161: { "½", ";", "{\\frac12}" },
4162: { "¾", ";", "{\\frac34}" },
4163: { "¿", ";", "{\\raisebox{-2}{\\rotatebox{180}{?}}}" },
4164: { "Â", ";", "{\\rm~\\hat~A}" },
4165: { "Ã", ";", "{\\rm~\\tilde~A}" },
4166: { "Ä", ";", "{\\rm~\\ddot~A}" },
4167: { "Å", ";", "{\\rm~A\\limits^{-1$o}}" },
4168: { "ã", ";", "{\\rm~\\tilde~a}" },
4169: { "ÿ", ";", "{\\rm~\\ddot~y}" }, /* ÿ is last, ÿ */
4170: /* ---------------------------------------
4171: LaTeX termchar mimeTeX equivalent...
4172: --------------------------------------- */
4173: { "\\AA", NULL, "{\\rm~A\\limits^{-1$o}}" },
4174: { "\\aa", NULL, "{\\rm~a\\limits^{-1$o}}" },
4175: { "\\bmod", NULL, "{\\hspace2{\\rm~mod}\\hspace2}" },
4176: { "\\vdots", NULL, "{\\raisebox3{\\rotatebox{90}{\\ldots}}}" },
4177: { "\\cdots", NULL, "{\\raisebox3{\\ldots}}" },
4178: { "\\ldots", NULL, "{\\fs4.\\hspace1.\\hspace1.}" },
4179: { "\\ddots", NULL, "{\\fs4\\raisebox8.\\hspace1\\raisebox4.\\hspace1.}"},
4180: { "\\notin", NULL, "{\\not\\in}" },
4181: { "\\neq", NULL, "{\\not=}" },
4182: { "\\hbar", NULL, "{\\compose~h{{\\fs{-1}-\\atop\\vspace3}}}" },
4183: { "\\angle", NULL, "{\\compose{\\hspace{3}\\lt}{\\circle(10,15;-80,80)}}"},
4184: { "\\cr", NULL, "\\\\" },
4185: { "\\iint", NULL, "{\\int\\int}\\limits" },
4186: { "\\Bigiint", NULL, "{\\Bigint\\Bigint}\\limits" },
4187: { "!`", NULL, "{\\raisebox{-2}{\\rotatebox{180}{!}}}" },
4188: { "?`", NULL, "{\\raisebox{-2}{\\rotatebox{180}{?}}}" },
4189: { "\\rightleftharpoons",NULL,"{\\rightharpoonup\\atop\\leftharpoondown}" },
4190: { "\\LaTeX", NULL, "{\\rm~L\\raisebox{3}{\\fs{-1}A}\\TeX}" },
4191: { "\\TeX", NULL, "{\\rm~T\\raisebox{-3}{E}X}" },
4192: { "\\cyan", NULL, "{\\reverse\\red\\reversebg}" },
4193: { "\\magenta",NULL, "{\\reverse\\green\\reversebg}" },
4194: { "\\yellow",NULL, "{\\reverse\\blue\\reversebg}" },
4195: { "\\hhline",NULL, "\\Hline" },
4196: { "\\Hline", NULL, "\\hline\\,\\\\\\hline" },
4197: /* ---------------------------------------------------------
4198: "Algebra Syntax" termchar mimeTeX/LaTeX equivalent...
4199: ------------------------------------------------------------ */
4200: { "sqrt", "1", "{\\sqrt{#1}}" },
4201: { "sin", "1", "{\\sin{#1}}" },
4202: { "cos", "1", "{\\cos{#1}}" },
4203: { "asin", "1", "{\\sin^{-1}{#1}}" },
4204: { "acos", "1", "{\\cos^{-1}{#1}}" },
4205: { "exp", "1", "{e^{#1}}" },
4206: { "det", "1", "{\\left|{#1}\\right|}" },
4207: /* ---------------------------------------
4208: LaTeX Constant termchar value...
4209: --------------------------------------- */
4210: { "\\thinspace", NULL, "2" },
4211: { "\\thinmathspace", NULL, "2" },
4212: { "\\textwidth", NULL, "400" },
4213: { NULL, NULL, NULL }
4214: } ; /* --- end-of-symbols[] --- */
4215: /* -------------------------------------------------------------------------
4216: first remove comments
4217: -------------------------------------------------------------------------- */
4218: expptr = expression; /* start search at beginning */
4219: while ( (leftptr=strstr(expptr,leftcomment)) != NULL ) /*found leftcomment*/
4220: {
4221: char *rightsym=NULL; /* rightcomment[isymbol] */
4222: expptr = leftptr+strlen(leftcomment); /* start rightcomment search here */
4223: /* --- check for any closing rightcomment, in given precedent order --- */
4224: if ( *expptr != '\000' ) /*have chars after this leftcomment*/
4225: for(isymbol=0; (rightsym=rightcomment[isymbol]) != NULL; isymbol++)
4226: if ( (tokptr=strstr(expptr,rightsym)) != NULL ) /*found rightcomment*/
4227: { tokptr += strlen(rightsym); /* first char after rightcomment */
4228: if ( *tokptr == '\000' ) /*nothing after this rightcomment*/
4229: { *leftptr = '\000'; /*so terminate expr at leftcomment*/
4230: break; } /* and stop looking for comments */
4231: *leftptr = '~'; /* replace entire comment by ~ */
4232: strcpy(leftptr+1,tokptr); /* and squeeze out comment */
4233: goto next_comment; } /* stop looking for rightcomment */
4234: /* --- no rightcomment after opening leftcomment --- */
4235: *leftptr = '\000'; /* so terminate expression */
4236: /* --- resume search past squeezed-out comment --- */
4237: next_comment:
4238: if ( *leftptr == '\000' ) break; /* reached end of expression */
4239: expptr = leftptr+1; /*resume search after this comment*/
4240: } /* --- end-of-while(leftptr!=NULL) --- */
4241: /* -------------------------------------------------------------------------
4242: convert \left( to \( and \right) to \), etc.
4243: -------------------------------------------------------------------------- */
4244: if ( xlateleft ) /* \left...\right xlation wanted */
4245: for ( idelim=0; idelim<2; idelim++ ) /* 0 for \left and 1 for \right */
4246: {
4247: char *lrstr = (idelim==0?"\\left":"\\right"); /* \left on 1st pass */
4248: int lrlen = (idelim==0?5:6); /* strlen() of \left or \right */
4249: char *braces = (idelim==0?LEFTBRACES ".":RIGHTBRACES "."), /*([{<or)]}>*/
4250: **lrfrom= (idelim==0?leftfrom:rightfrom), /* long braces like \| */
4251: **lrto = (idelim==0?leftto:rightto), /* xlated to 1-char like = */
4252: *lrsym = NULL; /* lrfrom[isymbol] */
4253: expptr = expression; /* start search at beginning */
4254: while ( (tokptr=strstr(expptr,lrstr)) != NULL ) /* found \left or \right */
4255: {
4256: if ( isthischar(*(tokptr+lrlen),braces) ) /* followed by a 1-char brace*/
4257: { strcpy(tokptr+1,tokptr+lrlen); /* so squeeze out "left" or "right"*/
4258: expptr = tokptr+2; } /* and resume search past brace */
4259: else /* may be a "long" brace like \| */
4260: {
4261: expptr = tokptr+lrlen; /*init to resume search past\left\rt*/
4262: for(isymbol=0; (lrsym=lrfrom[isymbol]) != NULL; isymbol++)
4263: { int symlen = strlen(lrsym); /* #chars in delim, e.g., 2 for \| */
4264: if ( memcmp(tokptr+lrlen,lrsym,symlen) == 0 ) /* found long delim*/
4265: { strcpy(tokptr+1,tokptr+lrlen+symlen-1); /* squeeze out delim */
4266: *(tokptr+1) = *(lrto[isymbol]); /* last char now 1-char delim*/
4267: expptr = tokptr+2 - lrlen; /* resume search past 1-char delim*/
4268: break; } /* no need to check more lrsym's */
4269: } /* --- end-of-for(isymbol) --- */
4270: } /* --- end-of-if/else(isthischar()) --- */
4271: } /* --- end-of-while(tokptr!=NULL) --- */
4272: } /* --- end-of-for(idelim) --- */
4273: /* -------------------------------------------------------------------------
4274: run thru table, converting all occurrences of each macro to its expansion
4275: -------------------------------------------------------------------------- */
4276: for(isymbol=0; (htmlsym=symbols[isymbol].html) != NULL; isymbol++)
4277: {
4278: int htmllen = strlen(htmlsym); /* length of escape, _without_ ; */
4279: int isalgebra = isalpha((int)(*htmlsym)); /* leading char alphabetic */
4280: char *aleft="{([<|", *aright="})]>|"; /*left,right delims for alg syntax*/
4281: char *args = symbols[isymbol].args, /* number {}-args, optional []-arg */
4282: *htmlterm = args, /*if *args nonumeric, then html term*/
4283: *latexsym = symbols[isymbol].latex; /*latex replacement for htmlsym*/
4284: char abuff[8192]; int iarg,nargs=0; /* macro expansion params */
4285: if ( args != NULL ) /*we have args (or htmlterm) param*/
4286: if ( *args != '\000' ) /* and it's not an empty string */
4287: if ( strchr("0123456789",*args) != NULL ) /* is 1st char #args=0-9 ? */
4288: { htmlterm = NULL; /* if so, then we have no htmlterm */
4289: *abuff = *args; abuff[1] = '\000'; /* #args char in ascii buffer */
4290: nargs = atoi(abuff); } /* interpret #args to numeric */
4291: expptr = expression; /* re-start search at beginning */
4292: while ( (tokptr=strstr(expptr,htmlsym)) != NULL ) /* found another sym */
4293: { char termchar = *(tokptr+htmllen); /* char terminating html sequence */
4294: int escapelen = htmllen; /* total length of escape sequence */
4295: *abuff = '\000'; /* default to empty string */
4296: if ( latexsym != NULL ) /* table has .latex xlation */
4297: if ( *latexsym != '\000' ) /* and it's not an empty string */
4298: strcpy(abuff,latexsym); /* so get local copy */
4299: if ( htmlterm != NULL ) /* sequence may have terminator */
4300: escapelen += (isthischar(termchar,htmlterm)?1:0); /*add terminator*/
4301: if ( isalpha((int)termchar) ) /*we just have prefix of longer sym*/
4302: { expptr = tokptr+htmllen; /* just resume search after prefix */
4303: continue; } /* but don't replace it */
4304: if ( !isthischar(*htmlsym,ESCAPE) /* our symbol isn't escaped */
4305: && !isthischar(*htmlsym,"&") ) /* and not an &html; special char */
4306: if ( tokptr != expression ) /* then if we're past beginning */
4307: if ( isthischar(*(tokptr-1),ESCAPE) /*and if inline symbol escaped*/
4308: || (isalpha(*(tokptr-1))) ) /* or if suffix of longer string */
4309: { expptr = tokptr+escapelen; /*just resume search after literal*/
4310: continue; } /* but don't replace it */
4311: if ( nargs > 0 ) /*substitute #1,#2,... in latexsym*/
4312: {
4313: char *arg1ptr = tokptr+escapelen;/* nargs begin after macro literal */
4314: char *optarg = args+1; /* ptr 1 char past #args digit 0-9 */
4315: expptr = arg1ptr; /* ptr to beginning of next arg */
4316: for ( iarg=1; iarg<=nargs; iarg++ ) /* one #`iarg` arg at a time */
4317: {
4318: char argsignal[32] = "#1", /* #1...#9 signals arg replacement */
4319: *argsigptr = NULL; /* ptr to argsignal in abuff[] */
4320: /* --- get argument value --- */
4321: *argval = '\000'; /* init arg as empty string */
4322: skipwhite(expptr); /* and skip leading white space */
4323: if ( iarg==1 && *optarg!='\000' /* check for optional [arg] */
4324: && !isalgebra ) /* but not in "algebra syntax" */
4325: { strcpy(argval,optarg); /* init with default value */
4326: if ( *expptr == '[' ) /* but user gave us [argval] */
4327: expptr = texsubexpr(expptr,argval,0,"[","]",0,0); } /*so get it*/
4328: else /* not optional, so get {argval} */
4329: if ( *expptr != '\000' ) /* check that some argval provided */
4330: if ( !isalgebra ) /* only { } delims for latex macro */
4331: expptr = texsubexpr(expptr,argval,0,"{","}",0,0); /*get {argval}*/
4332: else /*any delim for algebra syntax macro*/
4333: { expptr = texsubexpr(expptr,argval,0,aleft,aright,0,1);
4334: if ( isthischar(*argval,aleft) ) /* have delim-enclosed arg */
4335: if ( *argval != '{' ) /* and it's not { }-enclosed */
4336: { strchange(0,argval,"\\left"); /* insert opening \left, */
4337: strchange(0,argval+strlen(argval)-1,"\\right"); } /*\right*/
4338: } /* --- end-of-if/else(!isalgebra) --- */
4339: /* --- replace #`iarg` in macro with argval --- */
4340: sprintf(argsignal,"#%d",iarg); /* #1...#9 signals argument */
4341: while ( (argsigptr=strstr(argval,argsignal)) != NULL ) /* #1...#9 */
4342: strcpy(argsigptr,argsigptr+strlen(argsignal)); /*can't be in argval*/
4343: while ( (argsigptr=strstr(abuff,argsignal)) != NULL ) /* #1...#9 */
4344: strchange(strlen(argsignal),argsigptr,argval); /*replaced by argval*/
4345: } /* --- end-of-for(iarg) --- */
4346: escapelen += ((int)(expptr-arg1ptr)); /* add in length of all args */
4347: } /* --- end-of-if(nargs>0) --- */
4348: strchange(escapelen,tokptr,abuff); /*replace macro or html symbol*/
4349: expptr = tokptr + strlen(abuff); /*resume search after macro / html*/
4350: } /* --- end-of-while(tokptr!=NULL) --- */
4351: } /* --- end-of-for(isymbol) --- */
4352: /* -------------------------------------------------------------------------
4353: run thru table, converting all {a+b\atop c+d} to \atop{a+b}{c+d}
4354: -------------------------------------------------------------------------- */
4355: for(isymbol=0; (atopsym=atopcommands[isymbol]) != NULL; isymbol++)
4356: {
4357: int atoplen = strlen(atopsym); /* #chars in \atop */
4358: expptr = expression; /* re-start search at beginning */
4359: while ( (tokptr=strstr(expptr,atopsym)) != NULL ) /* found another atop */
4360: { char *leftbrace=NULL, *rightbrace=NULL; /*ptr to opening {, closing }*/
4361: char termchar = *(tokptr+atoplen); /* \atop followed by terminator */
4362: if ( msgfp!=NULL && msglevel>=999 )
4363: { fprintf(msgfp,"mimeprep> offset=%d rhs=\"%s\"\n",
4364: (int)(tokptr-expression),tokptr);
4365: fflush(msgfp); }
4366: if ( isalpha((int)termchar) ) /*we just have prefix of longer sym*/
4367: { expptr = tokptr+atoplen; /* just resume search after prefix */
4368: continue; } /* but don't process it */
4369: leftbrace = findbraces(expression,tokptr); /* find left { */
4370: rightbrace = findbraces(NULL,tokptr+atoplen-1); /* find right } */
4371: if ( leftbrace==NULL || rightbrace==NULL )
4372: { expptr += atoplen; continue; } /* skip command if didn't find */
4373: else /* we have bracketed { \atop } */
4374: {
4375: int leftlen = (int)(tokptr-leftbrace) - 1, /* #chars in left arg */
4376: rightlen = (int)(rightbrace-tokptr) - atoplen, /* and in right*/
4377: totlen = (int)(rightbrace-leftbrace) + 1; /*tot in { \atop }*/
4378: char *open=atopdelims[2*isymbol], *close=atopdelims[2*isymbol+1];
4379: char arg[8192], command[8192]; /* left/right args, new \atop{}{} */
4380: *command = '\000'; /* start with null string */
4381: if (open!=NULL) strcat(command,open); /* add open delim if needed */
4382: strcat(command,atopsym); /* add command with \atop */
4383: arg[0] = '{'; /* arg starts with { */
4384: memcpy(arg+1,leftbrace+1,leftlen); /* extract left-hand arg */
4385: arg[leftlen+1] = '\000'; /* and null terminate it */
4386: strcat(command,arg); /* concatanate {left-arg to \atop */
4387: strcat(command,"}{"); /* close left-arg, open right-arg */
4388: memcpy(arg,tokptr+atoplen,rightlen); /* right-hand arg */
4389: arg[rightlen] = '}'; /* add closing } */
4390: arg[rightlen+1] = '\000'; /* and null terminate it */
4391: if ( isthischar(*arg,WHITEMATH) ) /* 1st char was mandatory space */
4392: strcpy(arg,arg+1); /* so squeeze it out */
4393: strcat(command,arg); /* concatanate right-arg} */
4394: if (close!=NULL) strcat(command,close); /* add close delim if needed*/
4395: strchange(totlen-2,leftbrace+1,command); /* {\atop} --> {\atop{}{}} */
4396: expptr = leftbrace+strlen(command); /*resume search past \atop{}{}*/
4397: }
4398: } /* --- end-of-while(tokptr!=NULL) --- */
4399: } /* --- end-of-for(isymbol) --- */
4400: /* -------------------------------------------------------------------------
4401: back to caller with preprocessed expression
4402: -------------------------------------------------------------------------- */
4403: if ( msgfp!=NULL && msglevel>=99 ) /* display preprocessed expression */
4404: { fprintf(msgfp,"mimeprep> expression=\"\"%s\"\"\n",expression);
4405: fflush(msgfp); }
4406: return ( expression );
4407: } /* --- end-of-function mimeprep() --- */
4408:
4409:
4410: /* ==========================================================================
4411: * Function: strchange ( int nfirst, char *from, char *to )
4412: * Purpose: Changes the nfirst leading chars of `from` to `to`.
4413: * For example, to change char x[99]="12345678" to "123ABC5678"
4414: * call strchange(1,x+3,"ABC")
4415: * --------------------------------------------------------------------------
4416: * Arguments: nfirst (I) int containing #leading chars of `from`
4417: * that will be replace by `to`
4418: * from (I/O) char * to null-terminated string whose nfirst
4419: * leading chars will be replaced by `to`
4420: * to (I) char * to null-terminated string that will
4421: * replace the nfirst leading chars of `from`
4422: * --------------------------------------------------------------------------
4423: * Returns: ( char * ) ptr to first char of input `from`
4424: * or NULL for any error.
4425: * --------------------------------------------------------------------------
4426: * Notes: o If strlen(to)>nfirst, from must have memory past its null
4427: * (i.e., we don't do a realloc)
4428: * ======================================================================= */
4429: /* --- entry point --- */
4430: char *strchange ( int nfirst, char *from, char *to )
4431: {
4432: /* -------------------------------------------------------------------------
4433: Allocations and Declarations
4434: -------------------------------------------------------------------------- */
4435: int tolen = (to==NULL?0:strlen(to)), /* #chars in replacement string */
4436: nshift = abs(tolen-nfirst); /*need to shift from left or right*/
4437: /* -------------------------------------------------------------------------
4438: shift from left or right to accommodate replacement of its nfirst chars by to
4439: -------------------------------------------------------------------------- */
4440: if ( tolen < nfirst ) /* shift left is easy */
4441: strcpy(from,from+nshift); /* because memory doesn't overlap */
4442: if ( tolen > nfirst ) /* need more room at start of from */
4443: { char *pfrom = from+strlen(from); /* ptr to null terminating from */
4444: for ( ; pfrom>=from; pfrom-- ) /* shift all chars including null */
4445: *(pfrom+nshift) = *pfrom; } /* shift chars nshift places right */
4446: /* -------------------------------------------------------------------------
4447: from has exactly the right number of free leading chars, so just put to there
4448: -------------------------------------------------------------------------- */
4449: if ( tolen != 0 ) /* make sure to not empty or null */
4450: memcpy(from,to,tolen); /* chars moved into place */
4451: return ( from ); /* changed string back to caller */
4452: } /* --- end-of-function strchange() --- */
4453:
4454:
4455: /* ==========================================================================
4456: * Function: strreplace (char *string, char *from, char *to, int nreplace)
4457: * Purpose: Changes the first nreplace occurrences of 'from' to 'to'
4458: * in string, or all occurrences if nreplace=0.
4459: * --------------------------------------------------------------------------
4460: * Arguments: string (I/0) char * to null-terminated string in which
4461: * occurrence of 'from' will be replaced by 'to'
4462: * from (I) char * to null-terminated string
4463: * to be replaced by 'to'
4464: * to (I) char * to null-terminated string that will
4465: * replace 'from'
4466: * nreplace (I) int containing (maximum) number of
4467: * replacements, or 0 to replace all.
4468: * --------------------------------------------------------------------------
4469: * Returns: ( int ) number of replacements performed,
4470: * or 0 for no replacements or -1 for any error.
4471: * --------------------------------------------------------------------------
4472: * Notes: o
4473: * ======================================================================= */
4474: /* --- entry point --- */
4475: int strreplace ( char *string, char *from, char *to, int nreplace )
4476: {
4477: /* -------------------------------------------------------------------------
4478: Allocations and Declarations
4479: -------------------------------------------------------------------------- */
4480: int fromlen = (from==NULL?0:strlen(from)), /* #chars to be replaced */
4481: tolen = (to==NULL?0:strlen(to)); /* #chars in replacement string */
4482: char *pfrom = (char *)NULL, /*ptr to 1st char of from in string*/
4483: *pstring = string, /*ptr past previously replaced from*/
4484: *strchange(); /* change 'from' to 'to' */
4485: int nreps = 0; /* #replacements returned to caller*/
4486: /* -------------------------------------------------------------------------
4487: repace occurrences of 'from' in string to 'to'
4488: -------------------------------------------------------------------------- */
4489: if ( string == (char *)NULL /* no input string */
4490: || (fromlen<1 && nreplace<=0) ) /* replacing empty string forever */
4491: nreps = (-1); /* so signal error */
4492: else /* args okay */
4493: while (nreplace<1 || nreps<nreplace) /* up to #replacements requested */
4494: {
4495: if ( fromlen > 0 ) /* have 'from' string */
4496: pfrom = strstr(pstring,from); /*ptr to 1st char of from in string*/
4497: else pfrom = pstring; /*or empty from at start of string*/
4498: if ( pfrom == (char *)NULL ) break; /*no more from's, so back to caller*/
4499: if ( strchange(fromlen,pfrom,to) /* leading 'from' changed to 'to' */
4500: == (char *)NULL ) { nreps=(-1); break; } /* signal error to caller */
4501: nreps++; /* count another replacement */
4502: pstring = pfrom+tolen; /* pick up search after 'to' */
4503: if ( *pstring == '\000' ) break; /* but quit at end of string */
4504: } /* --- end-of-while() --- */
4505: return ( nreps ); /* #replacements back to caller */
4506: } /* --- end-of-function strreplace() --- */
4507:
4508:
4509: /* ==========================================================================
4510: * Function: strtexchr (char *string, char *texchr )
4511: * Purpose: Find first texchr in string, but texchr must be followed
4512: * by non-alpha
4513: * --------------------------------------------------------------------------
4514: * Arguments: string (I) char * to null-terminated string in which
4515: * firstoccurrence of delim will be found
4516: * texchr (I) char * to null-terminated string that
4517: * will be searched for
4518: * --------------------------------------------------------------------------
4519: * Returns: ( char * ) ptr to first char of texchr in string
4520: * or NULL if not found or for any error.
4521: * --------------------------------------------------------------------------
4522: * Notes: o texchr should contain its leading \, e.g., "\\left"
4523: * ======================================================================= */
4524: /* --- entry point --- */
4525: char *strtexchr ( char *string, char *texchr )
4526: {
4527: /* -------------------------------------------------------------------------
4528: Allocations and Declarations
4529: -------------------------------------------------------------------------- */
4530: char *strstr(), delim, *ptexchr=(char *)NULL; /* ptr returned to caller*/
4531: char *pstring = string; /* start or continue up search here*/
4532: int texchrlen = (texchr==NULL?0:strlen(texchr)); /* #chars in texchr */
4533: /* -------------------------------------------------------------------------
4534: locate texchr in string
4535: -------------------------------------------------------------------------- */
4536: if ( string != (char *)NULL /* check that we got input string */
4537: && texchrlen > 0 ) /* and a texchr to search for */
4538: while ( (ptexchr=strstr(pstring,texchr)) /* look for texchr in string */
4539: != (char *)NULL ) /* found it */
4540: if ( (delim = ptexchr[texchrlen]) /* char immediately after texchr */
4541: == '\000' ) break; /* texchr at very end of string */
4542: else /* if there are chars after texchr */
4543: if ( isalpha(delim) /*texchr is prefix of longer symbol*/
4544: || 0 ) /* other tests to be determined */
4545: pstring = ptexchr + texchrlen; /* continue search after texchr */
4546: else /* passed all tests */
4547: break; /*so return ptr to texchr to caller*/
4548: return ( ptexchr ); /* ptr to texchar back to caller */
4549: } /* --- end-of-function strtexchr() --- */
4550:
4551:
4552: /* ==========================================================================
4553: * Function: findbraces ( char *expression, char *command )
4554: * Purpose: If expression!=NULL, finds opening left { preceding command;
4555: * if expression==NULL, finds closing right } after command.
4556: * For example, to parse out {a+b\over c+d} call findbraces()
4557: * twice.
4558: * --------------------------------------------------------------------------
4559: * Arguments: expression (I) NULL to find closing right } after command,
4560: * or char * to null-terminated string to find
4561: * left opening { preceding command.
4562: * command (I) char * to null-terminated string whose
4563: * first character is usually the \ of \command
4564: * --------------------------------------------------------------------------
4565: * Returns: ( char * ) ptr to either opening { or closing },
4566: * or NULL for any error.
4567: * --------------------------------------------------------------------------
4568: * Notes: o
4569: * ======================================================================= */
4570: /* --- entry point --- */
4571: char *findbraces ( char *expression, char *command )
4572: {
4573: /* -------------------------------------------------------------------------
4574: Allocations and Declarations
4575: -------------------------------------------------------------------------- */
4576: int isopen = (expression==NULL?0:1); /* true to find left opening { */
4577: char *left="{", *right="}", /* delims bracketing {x\command y} */
4578: *delim = (isopen?left:right), /* delim we want, { if isopen */
4579: *match = (isopen?right:left), /* matching delim, } if isopen */
4580: *brace = NULL; /* ptr to delim returned to caller */
4581: int inc = (isopen?-1:+1); /* pointer increment */
4582: int level = 1; /* nesting level, for {{}\command} */
4583: char *ptr = command; /* start search here */
4584: int setbrace = 1; /* true to set {}'s if none found */
4585: /* -------------------------------------------------------------------------
4586: search for left opening { before command, or right closing } after command
4587: -------------------------------------------------------------------------- */
4588: while ( 1 ) /* search for brace, or until end */
4589: {
4590: /* --- next char to check for delim --- */
4591: ptr += inc; /* bump ptr left or right */
4592: /* --- check for beginning or end of expression --- */
4593: if ( isopen ) /* going left, check for beginning */
4594: { if ( ptr < expression ) break; } /* went before start of string */
4595: else { if ( *ptr == '\000' ) break; } /* went past end of string */
4596: /* --- don't check this char if it's escaped --- */
4597: if ( !isopen || ptr>expression ) /* very first char can't be escaped*/
4598: if ( isthischar(*(ptr-1),ESCAPE) ) /* escape char precedes current */
4599: continue; /* so don't check this char */
4600: /* --- check for delim --- */
4601: if ( isthischar(*ptr,delim) ) /* found delim */
4602: if ( --level == 0 ) /* and it's not "internally" nested*/
4603: { brace = ptr; /* set ptr to brace */
4604: goto end_of_job; } /* and return it to caller */
4605: /* --- check for matching delim --- */
4606: if ( isthischar(*ptr,match) ) /* found matching delim */
4607: level++; /* so bump nesting level */
4608: } /* --- end-of-while(1) --- */
4609: end_of_job:
4610: if ( brace == (char *)NULL ) /* open{ or close} not found */
4611: if ( setbrace ) /* want to force one at start/end? */
4612: brace = ptr; /* { before expressn, } after cmmnd*/
4613: return ( brace ); /*back to caller with delim or NULL*/
4614: } /* --- end-of-function findbraces() --- */
4615: #endif /* PART2 */
4616:
4617: /* ---
4618: * PART3
4619: * ------ */
4620: #if !defined(PARTS) || defined(PART3)
4621: /* ==========================================================================
4622: * Function: rasterize ( expression, size )
4623: * Purpose: returns subraster corresponding to (a valid LaTeX) expression
4624: * at font size
4625: * --------------------------------------------------------------------------
4626: * Arguments: expression (I) char * to first char of null-terminated
4627: * string containing valid LaTeX expression
4628: * to be rasterized
4629: * size (I) int containing 0-4 default font size
4630: * --------------------------------------------------------------------------
4631: * Returns: ( subraster * ) ptr to subraster corresponding to expression,
4632: * or NULL for any parsing error.
4633: * --------------------------------------------------------------------------
4634: * Notes: o This is mimeTeX's "main" reusable entry point. Easy to use:
4635: * just call it with a LaTeX expression, and get back a bitmap
4636: * of that expression. Then do what you want with the bitmap.
4637: * ======================================================================= */
4638: /* --- entry point --- */
4639: subraster *rasterize ( char *expression, int size )
4640: {
4641: /* -------------------------------------------------------------------------
4642: Allocations and Declarations
4643: -------------------------------------------------------------------------- */
4644: char *preamble(), pretext[256]; /* process preamble, if present */
4645: char chartoken[8192], *texsubexpr(), /*get subexpression from expression*/
4646: *subexpr = chartoken; /* token may be parenthesized expr */
4647: int isbrace(); /* check subexpr for braces */
4648: mathchardef *symdef, *get_symdef(); /*get mathchardef struct for symbol*/
4649: int natoms=0; /* #atoms/tokens processed so far */
4650: int type_raster(); /* display debugging output */
4651: subraster *rasterize(), /* recurse */
4652: *rastparen(), /* handle parenthesized subexpr's */
4653: *rastlimits(); /* handle sub/superscripted expr's */
4654: subraster *rastcat(), /* concatanate atom subrasters */
4655: *subrastcpy(), /* copy final result if a charaster*/
4656: *new_subraster(); /* new subraster for isstring mode */
4657: subraster *get_charsubraster(), /* character subraster */
4658: *sp=NULL, *prevsp=NULL, /* raster for current, prev char */
4659: *expraster = (subraster *)NULL; /* raster returned to caller */
4660: int delete_subraster(); /* free everything before returning*/
4661: /*int pixsz = 1;*/ /*default #bits per pixel, 1=bitmap*/
4662: /* --- global values saved/restored at each recursive iteration --- */
4663: int wastext = istext, /* initial istext mode flag */
4664: wasstring = isstring, /* initial isstring mode flag */
4665: wasdisplaystyle = isdisplaystyle, /*initial displaystyle mode flag*/
4666: oldfontsize = fontsize, /* initial fontsize */
4667: olddisplaysize = displaysize, /* initial \displaystyle size */
4668: oldshrinkfactor = shrinkfactor, /* initial shrinkfactor */
4669: oldsquashmargin = squashmargin, /* initial squashmargin */
4670: oldissquashdelta = issquashdelta, /* initial issquashdelta */
4671: *oldworkingparam = workingparam; /* initial working parameter */
4672: subraster *oldworkingbox = workingbox, /* initial working box */
4673: *oldleftexpression = leftexpression; /*left half rasterized so far*/
4674: double oldunitlength = unitlength; /* initial unitlength */
4675: mathchardef *oldleftsymdef = leftsymdef; /* init oldleftsymdef */
4676: /* -------------------------------------------------------------------------
4677: initialization
4678: -------------------------------------------------------------------------- */
4679: recurlevel++; /* wind up one more recursion level*/
4680: leftexpression = NULL; /* no leading left half yet */
4681: isreplaceleft = 0; /* reset replaceleft flag */
4682: /* shrinkfactor = shrinkfactors[max2(0,min2(size,LARGESTSIZE))];*/ /*set sf*/
4683: shrinkfactor = shrinkfactors[max2(0,min2(size,16))]; /* have 17 sf's */
4684: if ( msgfp!=NULL && msglevel >= 29 ) /*display expression for debugging*/
4685: { fprintf(msgfp,
4686: "rasterize> recursion level=%d, size=%d,\n\texpression=\"%s\"\n",
4687: recurlevel,size,(expression==NULL?"null":expression)); fflush(msgfp); }
4688: if ( expression == NULL ) goto end_of_job; /* nothing given to do */
4689: /* -------------------------------------------------------------------------
4690: preocess optional $-terminated preamble preceding expression
4691: -------------------------------------------------------------------------- */
4692: expression = preamble(expression,&size,pretext); /* size may be modified */
4693: if ( *expression == '\000' ) goto end_of_job; /* nothing left to do */
4694: fontsize = size; /* start at requested size */
4695: if ( isdisplaystyle == 1 ) /* displaystyle enabled but not set*/
4696: if ( !ispreambledollars ) /* style fixed by $$...$$'s */
4697: isdisplaystyle = (fontsize>=displaysize? 2:1); /*force at large fontsize*/
4698: /* -------------------------------------------------------------------------
4699: build up raster one character (or subexpression) at a time
4700: -------------------------------------------------------------------------- */
4701: while ( 1 )
4702: {
4703: /* --- get next character/token or subexpression --- */
4704: expression = texsubexpr(expression,chartoken,0,LEFTBRACES,RIGHTBRACES,1,1);
4705: subexpr = chartoken; /* "local" copy of chartoken ptr */
4706: leftsymdef = NULL; /* no character identified yet */
4707: sp = NULL; /* no subraster yet */
4708: size = fontsize; /* in case reset by \tiny, etc */
4709: /* --- debugging output --- */
4710: if ( msgfp!=NULL && msglevel >= 999 ) /* display chartoken for debugging */
4711: { fprintf(msgfp,"rasterize> recursion level=%d, atom#%d = \"%s\"\n",
4712: recurlevel,natoms+1,chartoken); fflush(msgfp); }
4713: if ( expression == NULL /* no more tokens */
4714: && *subexpr == '\000' ) break; /* and this token empty */
4715: if ( *subexpr == '\000' ) break; /* enough if just this token empty */
4716: /* --- check for parenthesized subexpression --- */
4717: if ( isbrace(subexpr,LEFTBRACES,1) ) /* got parenthesized subexpression */
4718: { if ( (sp=rastparen(&subexpr,size,prevsp)) /* rasterize subexpression */
4719: == NULL ) continue; } /* flush it if failed to rasterize */
4720: else /* --- single-character atomic token --- */
4721: if ( !isthischar(*subexpr,SCRIPTS) ) /* scripts handled below */
4722: {
4723: /* --- first look up mathchardef for atomic token in table --- */
4724: if ( (leftsymdef=symdef=get_symdef(chartoken)) /*mathchardef for token*/
4725: == NULL ) /* lookup failed */
4726: { char literal[512] = "[?]"; /*display for unrecognized literal*/
4727: int wastext = istext; /* error display in default mode */
4728: if ( msgfp!=NULL && msglevel >= 29 ) /* display unrecognized symbol */
4729: { fprintf(msgfp,"rasterize> get_symdef() failed for \"%s\"\n",
4730: chartoken); fflush(msgfp); }
4731: sp = (subraster *)NULL; /* init to signal failure */
4732: if ( warninglevel < 1 ) continue; /* warnings not wanted */
4733: istext = 0; /* reset from \mathbb, etc */
4734: if ( isthischar(*chartoken,ESCAPE) ) /* we got unrecognized \escape */
4735: { /* --- so display literal {\rm~[\backslash~chartoken?]} --- */
4736: strcpy(literal,"{\\rm~[\\backslash~"); /* init token */
4737: strcat(literal,chartoken+1); /* add chars following leading \ */
4738: strcat(literal,"?]}"); } /* add closing brace */
4739: sp = rasterize(literal,size-1); /* rasterize literal token */
4740: istext = wastext; /* reset text mode */
4741: if ( sp == (subraster *)NULL ) continue; } /*flush if rasterize fails*/
4742: else /* --- check if we have special handler to process this token --- */
4743: if ( symdef->handler != NULL ) /* have a handler for this token */
4744: { int arg1=symdef->charnum, arg2=symdef->family, arg3=symdef->class;
4745: if ( (sp = (subraster *) /* returned void* is subraster* */
4746: (*(symdef->handler))(&expression,size,prevsp,arg1,arg2,arg3))== NULL )
4747: continue; } /* flush token if handler failed */
4748: else /* --- no handler, so just get subraster for this character --- */
4749: if ( !isstring ) /* rasterizing */
4750: { if ( (sp=get_charsubraster(symdef,size)) /* get subraster */
4751: == NULL ) continue; } /* flush token if failed */
4752: else /* constructing ascii string */
4753: { char *symbol = symdef->symbol; /* symbol for ascii string */
4754: int symlen = (symbol!=NULL?strlen(symbol):0); /*#chars in symbol*/
4755: if ( symlen < 1 ) continue; /* no symbol for ascii string */
4756: if ( (sp=new_subraster(symlen+1,1,8)) /* subraster for symbol */
4757: == NULL ) continue; /* flush token if malloc failed */
4758: sp->type = ASCIISTRING; /* set subraster type */
4759: sp->symdef = symdef; /* and set symbol definition */
4760: sp->baseline = 1; /* default (should be unused) */
4761: strcpy((char *)((sp->image)->pixmap),symbol); /* copy symbol */
4762: /*((char *)((sp->image)->pixmap))[symlen] = '\000';*/ } /*null*/
4763: } /* --- end-of-if/else ... if/else --- */
4764: /* --- handle any super/subscripts following symbol or subexpression --- */
4765: sp = rastlimits(&expression,size,sp);
4766: /* --- debugging output --- */
4767: if ( msgfp!=NULL && msglevel >= 999 ) /* display raster for debugging */
4768: { fprintf(msgfp,"rasterize> recursion level=%d, atom#%d%s\n",
4769: recurlevel,natoms+1,(sp==NULL?" = null":"..."));
4770: if(sp!=NULL) type_raster(sp->image,msgfp); /* display raster */
4771: fflush(msgfp); } /* flush msgfp buffer */
4772: /* --- accumulate atom or parenthesized subexpression --- */
4773: if ( natoms < 1 /* nothing previous to concat */
4774: || expraster == NULL /* or previous was complete error */
4775: || isreplaceleft ) /* or we're replacing previous */
4776: { expraster = subrastcpy(sp); /* so just copy static CHARASTER */
4777: isreplaceleft = 0; } /* reset replacement flag */
4778: else /*we've already built up atoms so...*/
4779: if ( sp != NULL ) /* ...if we have a new component */
4780: expraster = rastcat(expraster,sp,1); /* concat new one, free previous */
4781: delete_subraster(prevsp); /* free prev (if not a CHARASTER) */
4782: prevsp = sp; /* current becomes previous */
4783: leftexpression = expraster; /* left half rasterized so far */
4784: /* --- bump count --- */
4785: natoms++; /* bump #atoms count */
4786: } /* --- end-of-while(expression!=NULL) --- */
4787: /* -------------------------------------------------------------------------
4788: back to caller with rasterized expression
4789: -------------------------------------------------------------------------- */
4790: end_of_job:
4791: delete_subraster(prevsp); /* free last (if not a CHARASTER) */
4792: /* --- debugging output --- */
4793: if ( msgfp!=NULL && msglevel >= 999 ) /* display raster for debugging */
4794: { fprintf(msgfp,"rasterize> Final recursion level=%d, atom#%d...\n",
4795: recurlevel,natoms);
4796: if ( expraster != (subraster *)NULL ) /* i.e., if natoms>0 */
4797: type_raster(expraster->image,msgfp); /* display completed raster */
4798: fflush(msgfp); } /* flush msgfp buffer */
4799: /* --- restore flags/values to original saved values --- */
4800: istext = wastext; /* text mode reset */
4801: isstring = wasstring; /* string mode reset */
4802: isdisplaystyle = wasdisplaystyle; /* displaystyle mode reset */
4803: fontsize = oldfontsize; /* fontsize reset */
4804: displaysize = olddisplaysize; /* \displaystyle size reset */
4805: shrinkfactor = oldshrinkfactor; /* shrinkfactor reset */
4806: squashmargin = oldsquashmargin; /* squashmargin reset */
4807: issquashdelta = oldissquashdelta; /* issquashdelta reset */
4808: workingparam = oldworkingparam; /* working parameter reset */
4809: workingbox = oldworkingbox; /* working box reset */
4810: leftexpression = oldleftexpression; /* leftexpression reset */
4811: leftsymdef = oldleftsymdef; /* leftsymdef reset */
4812: unitlength = oldunitlength; /* unitlength reset */
4813: recurlevel--; /* unwind one recursion level */
4814: /* --- return final subraster to caller --- */
4815: if ( 1 && expraster != (subraster *)NULL ) /* have an expression */
4816: { expraster->type = IMAGERASTER; /* set type to constructed image */
4817: expraster->size = fontsize; } /* set original input font size */
4818: return ( expraster );
4819: } /* --- end-of-function rasterize() --- */
4820:
4821:
4822: /* ==========================================================================
4823: * Function: rastparen ( subexpr, size, basesp )
4824: * Purpose: parentheses handler, returns a subraster corresponding to
4825: * parenthesized subexpression at font size
4826: * --------------------------------------------------------------------------
4827: * Arguments: subexpr (I) char ** to first char of null-terminated
4828: * string beginning with a LEFTBRACES
4829: * to be rasterized
4830: * size (I) int containing 0-5 default font size
4831: * basesp (I) subraster * to character (or subexpression)
4832: * immediately preceding leading left{
4833: * (unused, but passed for consistency)
4834: * --------------------------------------------------------------------------
4835: * Returns: ( subraster * ) ptr to subraster corresponding to subexpr,
4836: * or NULL for any parsing error
4837: * --------------------------------------------------------------------------
4838: * Notes: o This "handler" isn't in the mathchardef symbol table,
4839: * but is called directly from rasterize(), as necessary.
4840: * o Though subexpr is returned unchanged, it's passed as char **
4841: * for consistency with other handlers. Ditto, basesp is unused
4842: * but passed for consistency
4843: * ======================================================================= */
4844: /* --- entry point --- */
4845: subraster *rastparen ( char **subexpr, int size, subraster *basesp )
4846: {
4847: /* -------------------------------------------------------------------------
4848: Allocations and Declarations
4849: -------------------------------------------------------------------------- */
4850: char *expression = *subexpr; /* dereference subexpr to get char* */
4851: int explen = strlen(expression); /* total #chars, including parens */
4852: int isescape = 0, /* true if parens \escaped */
4853: isrightdot = 0, /* true if right paren is \right. */
4854: isleftdot = 0; /* true if left paren is \left. */
4855: char left[16], right[16]; /* parens enclosing expresion */
4856: char noparens[8192]; /* get subexpr without parens */
4857: subraster *rasterize(), *sp=NULL; /* rasterize what's between ()'s */
4858: int isheight = 1; /*true=full height, false=baseline*/
4859: int height, /* height of rasterized noparens[] */
4860: baseline; /* and its baseline */
4861: int family = CMEX10; /* family for paren chars */
4862: subraster *get_delim(), *lp=NULL, *rp=NULL; /* left and right paren chars */
4863: subraster *rastcat(); /* concatanate subrasters */
4864: int delete_subraster(); /*in case of error after allocation*/
4865: /* -------------------------------------------------------------------------
4866: rasterize "interior" of expression, i.e., without enclosing parens
4867: -------------------------------------------------------------------------- */
4868: /* --- first see if enclosing parens are \escaped --- */
4869: if ( isthischar(*expression,ESCAPE) ) /* expression begins with \escape */
4870: isescape = 1; /* so set flag accordingly */
4871: /* --- get expression *without* enclosing parens --- */
4872: strcpy(noparens,expression); /* get local copy of expression */
4873: noparens[explen-(1+isescape)] = '\000'; /* null-terminate before right} */
4874: strcpy(noparens,noparens+(1+isescape)); /* and then squeeze out left{ */
4875: /* --- rasterize it --- */
4876: if ( (sp = rasterize(noparens,size)) /*rasterize "interior" of expression*/
4877: == NULL ) goto end_of_job; /* quit if failed */
4878: /* --- no need to add parentheses for unescaped { --- */
4879: if ( !isescape && isthischar(*expression,"{") ) /* don't add parentheses */
4880: goto end_of_job; /* just return sp to caller */
4881: /* -------------------------------------------------------------------------
4882: obtain paren characters to enclose noparens[] raster with
4883: -------------------------------------------------------------------------- */
4884: /* --- first get left and right parens from expression --- */
4885: memset(left,0,16); memset(right,0,16); /* init parens with nulls */
4886: left[0] = *(expression+isescape); /* left{ is 1st or 2nd char */
4887: right[0] = *(expression+explen-1); /* right} is always last char */
4888: isleftdot = (isescape && isthischar(*left,".")); /* true if \left. */
4889: isrightdot = (isescape && isthischar(*right,".")); /* true if \right. */
4890: /* --- need height of noparens[] raster as minimum parens height --- */
4891: height = (sp->image)->height; /* height of noparens[] raster */
4892: baseline = sp->baseline; /* baseline of noparens[] raster */
4893: if ( !isheight ) height = baseline+1; /* parens only enclose baseline up */
4894: /* --- get best-fit parentheses characters --- */
4895: if ( !isleftdot ) /* if not \left. */
4896: lp = get_delim(left,height+1,family); /* get left paren char */
4897: if ( !isrightdot ) /* and if not \right. */
4898: rp = get_delim(right,height+1,family); /* get right paren char */
4899: if ( (lp==NULL && !isleftdot) /* check that we got left( */
4900: || (rp==NULL && !isrightdot) ) /* and right) if needed */
4901: { delete_subraster(sp); /* if failed, free subraster */
4902: if ( lp != NULL ) free ((void *)lp);/*free left-paren subraster envelope*/
4903: if ( rp != NULL ) free ((void *)rp);/*and right-paren subraster envelope*/
4904: sp = (subraster *)NULL; /* signal error to caller */
4905: goto end_of_job; } /* and quit */
4906: /* -------------------------------------------------------------------------
4907: set paren baselines to center on noparens[] raster, and concat components
4908: -------------------------------------------------------------------------- */
4909: /* --- set baselines to center paren chars on raster --- */
4910: if ( lp != NULL ) /* ignore for \left. */
4911: lp->baseline = baseline + ((lp->image)->height - height)/2;
4912: if ( rp != NULL ) /* ignore for \right. */
4913: rp->baseline = baseline + ((rp->image)->height - height)/2;
4914: /* --- concat lp||sp||rp to obtain final result --- */
4915: if ( lp != NULL ) /* ignore \left. */
4916: sp = rastcat(lp,sp,3); /* concat lp||sp and free sp,lp */
4917: if ( sp != NULL ) /* succeeded or ignored \left. */
4918: if ( rp != NULL ) /* ignore \right. */
4919: sp = rastcat(sp,rp,3); /* concat sp||rp and free sp,rp */
4920: /* --- back to caller --- */
4921: end_of_job:
4922: return ( sp );
4923: } /* --- end-of-function rastparen() --- */
4924:
4925:
4926: /* ==========================================================================
4927: * Function: rastlimits ( expression, size, basesp )
4928: * Purpose: \limits, \nolimts, _ and ^ handler,
4929: * dispatches call to rastscripts() or to rastdispmath()
4930: * as necessary, to handle sub/superscripts following symbol
4931: * --------------------------------------------------------------------------
4932: * Arguments: expression (I) char ** to first char of null-terminated
4933: * LaTeX expression (unused/unchanged)
4934: * size (I) int containing base font size (not used,
4935: * just stored in subraster)
4936: * basesp (I) subraster * to current character (or
4937: * subexpression) immediately preceding script
4938: * indicator
4939: * --------------------------------------------------------------------------
4940: * Returns: ( subraster * ) ptr to subraster returned by rastscripts()
4941: * or rastdispmath(), or NULL for any error
4942: * --------------------------------------------------------------------------
4943: * Notes: o
4944: * ======================================================================= */
4945: /* --- entry point --- */
4946: subraster *rastlimits ( char **expression, int size, subraster *basesp )
4947: {
4948: /* -------------------------------------------------------------------------
4949: Allocations and Declarations
4950: -------------------------------------------------------------------------- */
4951: subraster *rastscripts(), *rastdispmath(), /*one of these will do the work*/
4952: *rastcat(), /* may need to concat scripts */
4953: *scriptsp = basesp; /* and this will become the result */
4954: int isdisplay = (-1); /* set 1 for displaystyle, else 0 */
4955: int oldsquashmargin = squashmargin; /* save original squashmargin */
4956: int type_raster(); /* display debugging output */
4957: /* --- to check for \limits or \nolimits preceding scripts --- */
4958: char *texchar(), *exprptr=*expression, limtoken[255]; /*check for \limits*/
4959: int toklen=0; /* strlen(limtoken) */
4960: mathchardef *tokdef, *get_symdef(); /* mathchardef struct for limtoken */
4961: int class=(leftsymdef==NULL?NOVALUE:leftsymdef->class); /*base sym class*/
4962: /* -------------------------------------------------------------------------
4963: determine whether or not to use displaymath
4964: -------------------------------------------------------------------------- */
4965: scriptlevel++; /* first, increment subscript level*/
4966: *limtoken = '\000'; /* no token yet */
4967: if ( msgfp!=NULL && msglevel>=999 )
4968: { fprintf(msgfp,"rastlimits> scriptlevel#%d exprptr=%.48s\n",
4969: scriptlevel,(exprptr==NULL?"null":exprptr)); fflush(msgfp); }
4970: if ( isstring ) goto end_of_job; /* no scripts for ascii string */
4971: /* --- check for \limits or \nolimits --- */
4972: skipwhite(exprptr); /* skip white space before \limits */
4973: if ( exprptr != NULL ) /* expression ptr supplied */
4974: if ( *exprptr != '\000' ) /* something in expression */
4975: exprptr = texchar(exprptr,limtoken); /* retrieve next token */
4976: if ( *limtoken != '\000' ) /* have token */
4977: if ( (toklen=strlen(limtoken)) >= 3 ) /* which may be \[no]limits */
4978: if ( memcmp("\\limits",limtoken,toklen) == 0 /* may be \limits */
4979: || memcmp("\\nolimits",limtoken,toklen) == 0 ) /* or may be \nolimits */
4980: if ( (tokdef= get_symdef(limtoken)) /* look up token to be sure */
4981: != NULL ) /* found token in table */
4982: if ( strcmp("\\limits",tokdef->symbol) == 0 ) /* found \limits */
4983: isdisplay = 1; /* so explicitly set displaymath */
4984: else /* wasn't \limits */
4985: if ( strcmp("\\nolimits",tokdef->symbol) == 0 ) /* found \nolimits */
4986: isdisplay = 0; /* so explicitly reset displaymath */
4987: /* --- see if we found \[no]limits --- */
4988: if ( isdisplay != (-1) ) /* explicit directive found */
4989: *expression = exprptr; /* so bump expression past it */
4990: else /* noexplicit directive */
4991: { isdisplay = 0; /* init displaymath flag off */
4992: if ( isdisplaystyle ) /* we're in displaystyle math mode */
4993: if ( isdisplaystyle >= 5 ) /* and mode irrevocably forced true */
4994: { if ( class!=OPENING && class!=CLOSING ) /*don't force ('s and )'s*/
4995: isdisplay = 1; } /* set flag if mode forced true */
4996: else
4997: if ( isdisplaystyle >= 2 ) /*or mode forced conditionally true*/
4998: { if ( class!=VARIABLE && class!=ORDINARY /*don't force characters*/
4999: && class!=OPENING && class!=CLOSING /*don't force ('s and )'s*/
5000: && class!=BINARYOP /* don't force binary operators */
5001: && class!=NOVALUE ) /* finally, don't force "images" */
5002: isdisplay = 1; } /* set flag if mode forced true */
5003: else /* determine mode from base symbol */
5004: if ( class == DISPOPER ) /* it's a displaystyle operator */
5005: isdisplay = 1; } /* so set flag */
5006: /* -------------------------------------------------------------------------
5007: dispatch call to create sub/superscripts
5008: -------------------------------------------------------------------------- */
5009: if ( isdisplay ) /* scripts above/below base symbol */
5010: scriptsp = rastdispmath(expression,size,basesp); /* everything all done */
5011: else /* scripts alongside base symbol */
5012: if ( (scriptsp=rastscripts(expression,size,basesp)) == NULL ) /*no scripts*/
5013: scriptsp = basesp; /* so just return unscripted symbol*/
5014: else /* symbols followed by scripts */
5015: if ( basesp != NULL ) /* have base symbol */
5016: { squashmargin = 0; /* don't squash script */
5017: scriptsp = rastcat(basesp,scriptsp,2); /*concat scripts to base sym*/
5018: scriptsp->type = IMAGERASTER; /* flip type of composite object */
5019: scriptsp->size = size; } /* and set font size */
5020: end_of_job:
5021: squashmargin = oldsquashmargin; /* reset original squashmargin */
5022: if ( msgfp!=NULL && msglevel>=99 )
5023: { fprintf(msgfp,"rastlimits> scriptlevel#%d returning %s\n",
5024: scriptlevel,(scriptsp==NULL?"null":"..."));
5025: if ( scriptsp != NULL ) /* have a constructed raster */
5026: type_raster(scriptsp->image,msgfp); /*display constructed raster*/
5027: fflush(msgfp); }
5028: scriptlevel--; /*lastly, decrement subscript level*/
5029: return ( scriptsp );
5030: } /* --- end-of-function rastlimits() --- */
5031:
5032:
5033: /* ==========================================================================
5034: * Function: rastscripts ( expression, size, basesp )
5035: * Purpose: super/subscript handler, returns subraster for the leading
5036: * scripts in expression, whose base symbol is at font size
5037: * --------------------------------------------------------------------------
5038: * Arguments: expression (I/O) char ** to first char of null-terminated
5039: * string beginning with a super/subscript,
5040: * and returning ptr immediately following
5041: * last script character processed.
5042: * size (I) int containing 0-4 default font size
5043: * basesp (I) subraster * to character (or subexpression)
5044: * immediately preceding leading script
5045: * (scripts will be placed relative to base)
5046: * --------------------------------------------------------------------------
5047: * Returns: ( subraster * ) ptr to subraster corresponding to scripts,
5048: * or NULL for any parsing error
5049: * --------------------------------------------------------------------------
5050: * Notes: o This "handler" isn't in the mathchardef symbol table,
5051: * but is called directly from rasterize(), as necessary.
5052: * ======================================================================= */
5053: /* --- entry point --- */
5054: subraster *rastscripts ( char **expression, int size, subraster *basesp )
5055: {
5056: /* -------------------------------------------------------------------------
5057: Allocations and Declarations
5058: -------------------------------------------------------------------------- */
5059: char *texscripts(), /* parse expression for scripts */
5060: subscript[512], supscript[512]; /* scripts parsed from expression */
5061: subraster *rasterize(), *subsp=NULL, *supsp=NULL; /* rasterize scripts */
5062: subraster *new_subraster(), *sp=NULL, /* super- over subscript subraster */
5063: *rastack(); /*sets scripts in displaymath mode*/
5064: raster *rp=NULL; /* image raster embedded in sp */
5065: int height=0, width=0, baseline=0, /* height,width,baseline of sp */
5066: subht=0, subwidth=0, subln=0, /* height,width,baseline of sub */
5067: supht=0, supwidth=0, supln=0, /* height,width,baseline of sup */
5068: baseht=0, baseln=0; /* height,baseline of base */
5069: int bdescend=0, sdescend=0; /* descender of base, subscript */
5070: int issub=0, issup=0, isboth=0, /* true if we have sub,sup,both */
5071: isbase=0; /* true if we have base symbol */
5072: int szval = min2(max2(size,0),LARGESTSIZE), /* 0...LARGESTSIZE */
5073: vbetween = 2, /* vertical space between scripts */
5074: vabove = szval+1, /*sup's top/bot above base's top/bot*/
5075: vbelow = szval+1, /*sub's top/bot below base's top/bot*/
5076: vbottom = szval+1; /*sup's bot above (sub's below) bsln*/
5077: /*int istweak = 1;*/ /* true to tweak script positioning */
5078: int rastput(); /*put scripts in constructed raster*/
5079: int delete_subraster(); /* free work areas */
5080: int pixsz = 1; /*default #bits per pixel, 1=bitmap*/
5081: /* -------------------------------------------------------------------------
5082: Obtain subscript and/or superscript expressions, and rasterize them/it
5083: -------------------------------------------------------------------------- */
5084: /* --- parse for sub,superscript(s), and bump expression past it(them) --- */
5085: if ( expression == NULL ) goto end_of_job; /* no *ptr given */
5086: if ( *expression == NULL ) goto end_of_job; /* no expression given */
5087: if ( *(*expression) == '\000' ) goto end_of_job; /* nothing in expression */
5088: *expression = texscripts(*expression,subscript,supscript,3);
5089: /* --- rasterize scripts --- */
5090: if ( *subscript != '\000' ) /* have a subscript */
5091: subsp = rasterize(subscript,size-1); /* so rasterize it at size-1 */
5092: if ( *supscript != '\000' ) /* have a superscript */
5093: supsp = rasterize(supscript,size-1); /* so rasterize it at size-1 */
5094: /* --- set flags for convenience --- */
5095: issub = (subsp != (subraster *)NULL); /* true if we have subscript */
5096: issup = (supsp != (subraster *)NULL); /* true if we have superscript */
5097: isboth = (issub && issup); /* true if we have both */
5098: if (!issub && !issup) goto end_of_job; /* quit if we have neither */
5099: /* -------------------------------------------------------------------------
5100: get height, width, baseline of scripts, and height, baseline of base symbol
5101: -------------------------------------------------------------------------- */
5102: /* --- get height and width of components --- */
5103: if ( issub ) /* we have a subscript */
5104: { subht = (subsp->image)->height; /* so get its height */
5105: subwidth = (subsp->image)->width; /* and width */
5106: subln = subsp->baseline; } /* and baseline */
5107: if ( issup ) /* we have a superscript */
5108: { supht = (supsp->image)->height; /* so get its height */
5109: supwidth = (supsp->image)->width; /* and width */
5110: supln = supsp->baseline; } /* and baseline */
5111: /* --- get height and baseline of base, and descender of base and sub --- */
5112: if ( basesp == (subraster *)NULL ) /* no base symbol for scripts */
5113: basesp = leftexpression; /* try using left side thus far */
5114: if ( basesp != (subraster *)NULL ) /* we have base symbol for scripts */
5115: { baseht = (basesp->image)->height; /* height of base symbol */
5116: baseln = basesp->baseline; /* and its baseline */
5117: bdescend = baseht-(baseln+1); /* and base symbol descender */
5118: sdescend = bdescend + vbelow; /*sub must descend by at least this*/
5119: if ( baseht > 0 ) isbase = 1; } /* set flag */
5120: /* -------------------------------------------------------------------------
5121: determine width of constructed raster
5122: -------------------------------------------------------------------------- */
5123: width = max2(subwidth,supwidth); /*widest component is overall width*/
5124: /* -------------------------------------------------------------------------
5125: determine height and baseline of constructed raster
5126: -------------------------------------------------------------------------- */
5127: /* --- both super/subscript --- */
5128: if ( isboth ) /*we have subscript and superscript*/
5129: { height = max2(subht+vbetween+supht, /* script heights + space bewteen */
5130: vbelow+baseht+vabove); /*sub below base bot, sup above top*/
5131: baseline = baseln + (height-baseht)/2; } /*center scripts on base symbol*/
5132: /* --- superscript only --- */
5133: if ( !issub ) /* we only have a superscript */
5134: { height = max3(baseln+1+vabove, /* sup's top above base symbol top */
5135: supht+vbottom, /* sup's bot above baseln */
5136: supht+vabove-bdescend); /* sup's bot above base symbol bot */
5137: baseline = height-1; } /*sup's baseline at bottom of raster*/
5138: /* --- subscript only --- */
5139: if ( !issup ) /* we only have a subscript */
5140: if ( subht > sdescend ) /*sub can descend below base bot...*/
5141: { height = subht; /* ...without extra space on top */
5142: baseline = height-(sdescend+1); /* sub's bot below base symbol bot */
5143: baseline = min2(baseline,max2(baseln-vbelow,0)); }/*top below base top*/
5144: else /* sub's top will be below baseln */
5145: { height = sdescend+1; /* sub's bot below base symbol bot */
5146: baseline = 0; } /* sub's baseline at top of raster */
5147: /* -------------------------------------------------------------------------
5148: construct raster with superscript over subscript
5149: -------------------------------------------------------------------------- */
5150: /* --- allocate subraster containing constructed raster --- */
5151: if ( (sp=new_subraster(width,height,pixsz)) /*allocate subraster and raster*/
5152: == NULL ) /* and if we fail to allocate */
5153: goto end_of_job; /* quit */
5154: /* --- initialize subraster parameters --- */
5155: sp->type = IMAGERASTER; /* set type as constructed image */
5156: sp->size = size; /* set given size */
5157: sp->baseline = baseline; /* composite scripts baseline */
5158: rp = sp->image; /* raster embedded in subraster */
5159: /* --- place super/subscripts in new raster --- */
5160: if ( issup ) /* we have a superscript */
5161: rastput(rp,supsp->image,0,0,1); /* it goes in upper-left corner */
5162: if ( issub ) /* we have a subscript */
5163: rastput(rp,subsp->image,height-subht,0,1); /*in lower-left corner*/
5164: /* -------------------------------------------------------------------------
5165: free unneeded component subrasters and return final result to caller
5166: -------------------------------------------------------------------------- */
5167: end_of_job:
5168: if ( issub ) delete_subraster(subsp); /* free unneeded subscript */
5169: if ( issup ) delete_subraster(supsp); /* and superscript */
5170: return ( sp );
5171: } /* --- end-of-function rastscripts() --- */
5172:
5173:
5174: /* ==========================================================================
5175: * Function: rastdispmath ( expression, size, sp )
5176: * Purpose: displaymath handler, returns sp along with
5177: * its immediately following super/subscripts
5178: * --------------------------------------------------------------------------
5179: * Arguments: expression (I/O) char ** to first char of null-terminated
5180: * string immediately following sp to be
5181: * rasterized along with its super/subscripts,
5182: * and returning ptr immediately following last
5183: * character processed.
5184: * size (I) int containing 0-4 default font size
5185: * sp (I) subraster * to display math operator
5186: * to which super/subscripts will be added
5187: * --------------------------------------------------------------------------
5188: * Returns: ( subraster * ) ptr to subraster corresponding to sp
5189: * plus its scripts, or NULL for any error
5190: * --------------------------------------------------------------------------
5191: * Notes: o sp returned unchanged if no super/subscript(s) follow it.
5192: * ======================================================================= */
5193: /* --- entry point --- */
5194: subraster *rastdispmath ( char **expression, int size, subraster *sp )
5195: {
5196: /* -------------------------------------------------------------------------
5197: Allocations and Declarations
5198: -------------------------------------------------------------------------- */
5199: char *texscripts(), /* parse expression for scripts */
5200: subscript[512], supscript[512]; /* scripts parsed from expression */
5201: int issub=0, issup=0; /* true if we have sub,sup */
5202: subraster *rasterize(), *subsp=NULL, *supsp=NULL, /* rasterize scripts */
5203: *rastack(), /* stack operator with scripts */
5204: *new_subraster(); /* for dummy base sp, if needed */
5205: int vspace = 1; /* vertical space between scripts */
5206: /* -------------------------------------------------------------------------
5207: Obtain subscript and/or superscript expressions, and rasterize them/it
5208: -------------------------------------------------------------------------- */
5209: /* --- parse for sub,superscript(s), and bump expression past it(them) --- */
5210: if ( expression == NULL ) goto end_of_job; /* no *ptr given */
5211: if ( *expression == NULL ) goto end_of_job; /* no expression given */
5212: if ( *(*expression) == '\000' ) goto end_of_job; /* nothing in expression */
5213: *expression = texscripts(*expression,subscript,supscript,3);
5214: /* --- rasterize scripts --- */
5215: if ( *subscript != '\000' ) /* have a subscript */
5216: subsp = rasterize(subscript,size-1); /* so rasterize it at size-1 */
5217: if ( *supscript != '\000' ) /* have a superscript */
5218: supsp = rasterize(supscript,size-1); /* so rasterize it at size-1 */
5219: /* --- set flags for convenience --- */
5220: issub = (subsp != (subraster *)NULL); /* true if we have subscript */
5221: issup = (supsp != (subraster *)NULL); /* true if we have superscript */
5222: if (!issub && !issup) goto end_of_job; /*return operator alone if neither*/
5223: /* -------------------------------------------------------------------------
5224: stack operator and its script(s)
5225: -------------------------------------------------------------------------- */
5226: /* --- stack superscript atop operator --- */
5227: if ( issup ) /* we have a superscript */
5228: if ( sp == NULL ) /* but no base expression */
5229: sp = supsp; /* so just use superscript */
5230: else /* have base and superscript */
5231: if ( (sp=rastack(sp,supsp,1,vspace,1,3)) /* stack supsp atop base sp */
5232: == NULL ) goto end_of_job; /* and quit if failed */
5233: /* --- stack operator+superscript atop subscript --- */
5234: if ( issub ) /* we have a subscript */
5235: if ( sp == NULL ) /* but no base expression */
5236: sp = subsp; /* so just use subscript */
5237: else /* have base and subscript */
5238: if ( (sp=rastack(subsp,sp,2,vspace,1,3)) /* stack sp atop base subsp */
5239: == NULL ) goto end_of_job; /* and quit if failed */
5240: sp->type = IMAGERASTER; /* flip type of composite object */
5241: sp->size = size; /* and set font size */
5242: /* -------------------------------------------------------------------------
5243: free unneeded component subrasters and return final result to caller
5244: -------------------------------------------------------------------------- */
5245: end_of_job:
5246: return ( sp );
5247: } /* --- end-of-function rastdispmath() --- */
5248:
5249:
5250: /* ==========================================================================
5251: * Function: rastleft ( expression, size, basesp, ildelim, arg2, arg3 )
5252: * Purpose: \left...\right handler, returns a subraster corresponding to
5253: * delimited subexpression at font size
5254: * --------------------------------------------------------------------------
5255: * Arguments: expression (I) char ** to first char of null-terminated
5256: * string beginning with a \left
5257: * to be rasterized
5258: * size (I) int containing 0-5 default font size
5259: * basesp (I) subraster * to character (or subexpression)
5260: * immediately preceding leading left{
5261: * (unused, but passed for consistency)
5262: * ildelim (I) int containing ldelims index of
5263: * left delimiter
5264: * arg2 (I) int unused
5265: * arg3 (I) int unused
5266: * --------------------------------------------------------------------------
5267: * Returns: ( subraster * ) ptr to subraster corresponding to subexpr,
5268: * or NULL for any parsing error
5269: * --------------------------------------------------------------------------
5270: * Notes: o
5271: * ======================================================================= */
5272: /* --- entry point --- */
5273: subraster *rastleft ( char **expression, int size, subraster *basesp,
5274: int ildelim, int arg2, int arg3 )
5275: {
5276: /* -------------------------------------------------------------------------
5277: Allocations and Declarations
5278: -------------------------------------------------------------------------- */
5279: subraster *rasterize(), *sp=NULL; /*rasterize between \left...\right*/
5280: subraster *get_delim(), *lp=NULL, *rp=NULL; /* left and right delim chars */
5281: subraster *rastlimits(); /*handle sub/super scripts on lp,rp*/
5282: subraster *rastcat(); /* concat lp||sp||rp subrasters */
5283: int family=CMSYEX, /* get_delim() family */
5284: height=0, rheight=0, /* subexpr, right delim height */
5285: margin=(size+1), /* delim height margin over subexpr*/
5286: opmargin=(5); /* extra margin for \int,\sum,\etc */
5287: char subexpr[8192]; /* chars between \left...\right */
5288: char *texchar(), /* get delims after \left,\right */
5289: ldelim[256]=".", rdelim[256]="."; /* delims following \left,\right */
5290: char *strtexchr(), *pleft, *pright; /*locate \right matching our \left*/
5291: int isleftdot=0, isrightdot=0; /* true if \left. or \right. */
5292: int sublen=0; /* strlen(subexpr) */
5293: int idelim=0; /* 1=left,2=right */
5294: int delete_subraster(); /* free subraster if rastleft fails*/
5295: int wasdisplaystyle = isdisplaystyle; /* save current displaystyle */
5296: /* --- recognized delimiters --- */
5297: static char left[16]="\\left", right[16]="\\right"; /* tex delimiters */
5298: static char *ldelims[] = {
5299: "unused", ".", /* 1 for \left., \right. */
5300: "(", ")", /* 2,3 for \left(, \right) */
5301: "\\{","\\}", /* 4,5 for \left\{, \right\} */
5302: "[", "]", /* 6,7 for \left[, \right] */
5303: "<", ">", /* 8,9 for \left<, \right> */
5304: "|", "\\|", /* 10,11 for \left,\right |,\|*/
5305: NULL };
5306: /* --- recognized operator delimiters --- */
5307: static char *opdelims[] = { /* operator delims from cmex10 */
5308: "int", "sum", "prod",
5309: "cup", "cap", "dot",
5310: "plus", "times", "wedge",
5311: "vee",
5312: NULL }; /* --- end-of-opdelims[] --- */
5313: /* --- delimiter xlation --- */
5314: static char *xfrom[] = /* xlate any delim suffix... */
5315: { "\\|", /* \| */
5316: "\\{", /* \{ */
5317: "\\}", /* \} */
5318: "\\lbrace", /* \lbrace */
5319: "\\rbrace", /* \rbrace */
5320: "\\langle", /* \langle */
5321: "\\rangle", /* \rangle */
5322: NULL } ; /* --- end-of-xfrom[] --- */
5323: static char *xto[] = /* ...to this instead */
5324: { "=", /* \| to = */
5325: "{", /* \{ to { */
5326: "}", /* \} to } */
5327: "{", /* \lbrace to { */
5328: "}", /* \rbrace to } */
5329: "<", /* \langle to < */
5330: ">", /* \rangle to > */
5331: NULL } ; /* --- end-of-xto[] --- */
5332: /* -------------------------------------------------------------------------
5333: initialization
5334: -------------------------------------------------------------------------- */
5335: /* --- check args --- */
5336: if ( *(*expression) == '\000' ) goto end_of_job; /* nothing after \left */
5337: /* --- determine left delimiter, and set default \right. delimiter --- */
5338: if ( ildelim!=NOVALUE && ildelim>=1 ) /* called with explicit left delim */
5339: strcpy(ldelim,ldelims[ildelim]); /* so just get a local copy */
5340: else /* trapped \left without delim */
5341: { skipwhite(*expression); /* interpret \left ( as \left( */
5342: *expression = texchar(*expression,ldelim); } /*pull delim from expression*/
5343: strcpy(rdelim,"."); /* init default \right. delim */
5344: /* -------------------------------------------------------------------------
5345: locate \right balancing our opening \left
5346: -------------------------------------------------------------------------- */
5347: /* --- first \right following \left --- */
5348: if ( (pright=strtexchr(*expression,right)) /* look for \right after \left */
5349: != NULL ) { /* found it */
5350: /* --- find matching \right by pushing past any nested \left's --- */
5351: pleft = *expression; /* start after first \left( */
5352: while ( 1 ) { /*break when matching \right found*/
5353: /* -- locate next nested \left if there is one --- */
5354: if ( (pleft=strtexchr(pleft,left)) /* find next \left */
5355: == NULL ) break; /*no more, so matching \right found*/
5356: pleft += strlen(left); /* push ptr past \left token */
5357: if ( pleft >= pright ) break; /* not nested if \left after \right*/
5358: /* --- have nested \left, so push forward to next \right --- */
5359: if ( (pright=strtexchr(pright+strlen(right),right)) /* find next \right */
5360: == NULL ) break; /* ran out of \right's */
5361: } /* --- end-of-while(1) --- */
5362: } /* --- end-of-if(pright!=NULL) --- */
5363: /* -------------------------------------------------------------------------
5364: push past \left(_a^b sub/superscripts, if present
5365: -------------------------------------------------------------------------- */
5366: pleft = *expression; /*reset pleft after opening \left( */
5367: /*lp=*/ rastlimits(expression,size,lp); /*dummy call push expression past b*/
5368: /* -------------------------------------------------------------------------
5369: get \right delimiter and subexpression between \left...\right, xlate delims
5370: -------------------------------------------------------------------------- */
5371: /* --- get delimiter following \right --- */
5372: if ( pright == (char *)NULL ) { /* assume \right. at end of exprssn*/
5373: strcpy(rdelim,"."); /* set default \right. */
5374: sublen = strlen(*expression); /* use entire remaining expression */
5375: memcpy(subexpr,*expression,sublen); /* copy all remaining chars */
5376: *expression += sublen; } /* and push expression to its null */
5377: else { /* have explicit matching \right */
5378: sublen = (int)(pright-(*expression)); /* #chars between \left...\right */
5379: memcpy(subexpr,*expression,sublen); /* copy chars preceding \right */
5380: *expression = pright+strlen(right); /* push expression past \right */
5381: skipwhite(*expression); /* interpret \right ) as \right) */
5382: *expression = texchar(*expression,rdelim); /*pull delim from expression*/
5383: if ( *rdelim == '\000' ) strcpy(rdelim,"."); } /* \right. if no rdelim */
5384: /* --- get subexpression between \left...\right --- */
5385: if ( sublen < 1 ) goto end_of_job; /* nothing between delimiters */
5386: subexpr[sublen] = '\000'; /* and null-terminate it */
5387: /* --- check for operator delimiter --- */
5388: for ( idelim=0; opdelims[idelim]!=NULL; idelim++ )
5389: if ( strstr(ldelim,opdelims[idelim]) != NULL ) /* found operator */
5390: { margin += opmargin; /* extra height for operator */
5391: if ( *ldelim == '\\' ) /* have leading escape */
5392: strcpy(ldelim,ldelim+1); /* squeeze it out */
5393: break; } /* no need to check rest of table */
5394: /* --- xlate delimiters --- */
5395: for ( idelim=1; idelim<=2; idelim++ ) { /* 1=left, 2=right */
5396: char *lrdelim = (idelim==1? ldelim:rdelim); /* ldelim or rdelim */
5397: int ix; char *xdelim; /* xfrom[] and xto[] index, delim */
5398: for( ix=0; (xdelim=xfrom[ix]) != NULL; ix++ )
5399: if ( strcmp(lrdelim,xdelim) == 0 ) /* found delim to xlate */
5400: { strcpy(lrdelim,xto[ix]); /* replace with corresponding xto[]*/
5401: break; } /* no need to check further */
5402: } /* --- end-of-for(idelim) --- */
5403: /* --- debugging --- */
5404: if ( msgfp!=NULL && msglevel>=99 )
5405: fprintf(msgfp,"rastleft> left=\"%s\" right=\"%s\" subexpr=\"%s\"\n",
5406: ldelim,rdelim,subexpr);
5407: /* -------------------------------------------------------------------------
5408: rasterize subexpression
5409: -------------------------------------------------------------------------- */
5410: /* --- rasterize subexpression --- */
5411: if ( (sp = rasterize(subexpr,size)) /* rasterize chars between delims */
5412: == NULL ) goto end_of_job; /* quit if failed */
5413: height = (sp->image)->height; /* height of subexpr raster */
5414: rheight = height+margin; /*default rheight as subexpr height*/
5415: /* -------------------------------------------------------------------------
5416: rasterize delimiters, reset baselines, and add sub/superscripts if present
5417: -------------------------------------------------------------------------- */
5418: /* --- check for dot delimiter --- */
5419: isleftdot = (strchr(ldelim,'.')!=NULL); /* true if \left. */
5420: isrightdot = (strchr(rdelim,'.')!=NULL); /* true if \right. */
5421: /* --- get rasters for best-fit delim characters, add sub/superscripts --- */
5422: isdisplaystyle = 9; /* force \displaystyle */
5423: if ( !isleftdot ) /* if not \left. */
5424: { /* --- first get requested \left delimiter --- */
5425: lp = get_delim(ldelim,rheight,family); /* get \left delim char */
5426: /* --- reset lp delim baseline to center delim on subexpr raster --- */
5427: if ( lp != NULL ) /* if get_delim() succeeded */
5428: { int lheight = (lp->image)->height; /* actual height of left delim */
5429: lp->baseline = sp->baseline + (lheight - height)/2;
5430: if ( lheight > rheight ) /* got bigger delim than requested */
5431: rheight = lheight-1; } /* make sure right delim matches */
5432: /* --- then add on any sub/superscripts attached to \left( --- */
5433: lp = rastlimits(&pleft,size,lp); } /*\left(_a^b and push pleft past b*/
5434: isdisplaystyle = 9; /* force \displaystyle */
5435: if ( !isrightdot ) /* and if not \right. */
5436: { /* --- first get requested \right delimiter --- */
5437: rp = get_delim(rdelim,rheight,family); /* get \right delim char */
5438: /* --- reset rp delim baseline to center delim on subexpr raster --- */
5439: if ( rp != NULL ) /* if get_delim() succeeded */
5440: rp->baseline = sp->baseline + ((rp->image)->height - height)/2;
5441: /* --- then add on any sub/superscripts attached to \right) --- */
5442: rp = rastlimits(expression,size,rp); } /*\right)_c^d, expression past d*/
5443: isdisplaystyle = wasdisplaystyle; /* original \displystyle default */
5444: /* --- check that we got delimiters --- */
5445: if ( 0 )
5446: if ( (lp==NULL && !isleftdot) /* check that we got left( */
5447: || (rp==NULL && !isrightdot) ) /* and right) if needed */
5448: { if ( lp != NULL ) free ((void *)lp); /* free \left-delim subraster */
5449: if ( rp != NULL ) free ((void *)rp); /* and \right-delim subraster */
5450: if (0) { delete_subraster(sp); /* if failed, free subraster */
5451: sp = (subraster *)NULL; } /* signal error to caller */
5452: goto end_of_job; } /* and quit */
5453: /* -------------------------------------------------------------------------
5454: concat lp || sp || rp components
5455: -------------------------------------------------------------------------- */
5456: /* --- concat lp||sp||rp to obtain final result --- */
5457: if ( lp != NULL ) /* ignore \left. */
5458: sp = rastcat(lp,sp,3); /* concat lp||sp and free sp,lp */
5459: if ( sp != NULL ) /* succeeded or ignored \left. */
5460: if ( rp != NULL ) /* ignore \right. */
5461: sp = rastcat(sp,rp,3); /* concat sp||rp and free sp,rp */
5462: /* --- back to caller --- */
5463: end_of_job:
5464: return ( sp );
5465: } /* --- end-of-function rastleft() --- */
5466:
5467:
5468: /* ==========================================================================
5469: * Function: rastflags ( expression, size, basesp, flag, value, arg3 )
5470: * Purpose: sets an internal flag, e.g., for \rm, or sets an internal
5471: * value, e.g., for \unitlength=<value>, and returns NULL
5472: * so nothing is displayed
5473: * --------------------------------------------------------------------------
5474: * Arguments: expression (I) char ** to first char of null-terminated
5475: * LaTeX expression (unused/unchanged)
5476: * size (I) int containing base font size (not used,
5477: * just stored in subraster)
5478: * basesp (I) subraster * to character (or subexpression)
5479: * immediately preceding space, whose baseline
5480: * and height params are transferred to space
5481: * flag (I) int containing #define'd symbol specifying
5482: * internal flag to be set
5483: * value (I) int containing new value of flag
5484: * arg3 (I) int unused
5485: * --------------------------------------------------------------------------
5486: * Returns: ( subraster * ) NULL so nothing is displayed
5487: * --------------------------------------------------------------------------
5488: * Notes: o
5489: * ======================================================================= */
5490: /* --- entry point --- */
5491: subraster *rastflags ( char **expression, int size, subraster *basesp,
5492: int flag, int value, int arg3 )
5493: {
5494: /* -------------------------------------------------------------------------
5495: Allocations and Declarations
5496: -------------------------------------------------------------------------- */
5497: char *texsubexpr(), /* parse expression for... */
5498: valuearg[1024]="NOVALUE"; /* value from expression, if needed */
5499: int argvalue=NOVALUE, /* atoi(valuearg) */
5500: isdelta=0, /* true if + or - precedes valuearg */
5501: valuelen=0; /* strlen(valuearg) */
5502: double strtod(); /*convert ascii {valuearg} to double*/
5503: static int displaystylelevel = (-99); /* \displaystyle set at recurlevel */
5504: /* -------------------------------------------------------------------------
5505: set flag or value
5506: -------------------------------------------------------------------------- */
5507: switch ( flag )
5508: {
5509: default: break; /* unrecognized flag */
5510: case ISTEXT:
5511: if ( isthischar((*(*expression)),WHITEMATH) ) /* \rm followed by white */
5512: (*expression)++; /* skip leading ~ after \rm */
5513: istext=value; /* set text mode */
5514: break;
5515: case ISSTRING: isstring=value; break; /* set string/image mode */
5516: case ISDISPLAYSTYLE: /* set \displaystyle mode */
5517: displaystylelevel = recurlevel; /* \displaystyle set at recurlevel */
5518: isdisplaystyle=value; break;
5519: case ISOPAQUE: istransparent=value; break; /* set transparent/opaque */
5520: case ISREVERSE: /* reverse video */
5521: if ( value==1 || value==NOVALUE )
5522: { fgred=255-fgred; fggreen=255-fggreen; fgblue=255-fgblue; }
5523: if ( value==2 || value==NOVALUE )
5524: { bgred=255-bgred; bggreen=255-bggreen; bgblue=255-bgblue; }
5525: if ( value==2 || value==NOVALUE )
5526: isblackonwhite = !isblackonwhite;
5527: break;
5528: case ISSUPER: /* set supersampling/lowpass flag */
5529: #ifndef SSFONTS /* don't have ss fonts loaded */
5530: value = 0; /* so force lowpass */
5531: #endif
5532: isss = issupersampling = value;
5533: fonttable = (issupersampling?ssfonttable:aafonttable); /* set fonts */
5534: break;
5535: case ISFONTSIZE: /* set fontsize */
5536: case ISDISPLAYSIZE: /* set displaysize */
5537: case ISSHRINK: /* set shrinkfactor */
5538: case ISAAALGORITHM: /* set anti-aliasing algorithm */
5539: case ISWEIGHT: /* set font weight */
5540: case ISCENTERWT: /* set lowpass center pixel weight */
5541: case ISADJACENTWT: /* set lowpass adjacent weight */
5542: case ISCORNERWT: /* set lowpass corner weight */
5543: case ISCOLOR: /* set red(1),green(2),blue(3) */
5544: case ISSQUASH: /* set (minimum) "squash" margin */
5545: if ( value != NOVALUE ) /* passed a fixed value to be set */
5546: argvalue = value; /* set given fixed value */
5547: else /* get value from expression */
5548: { *expression = texsubexpr(*expression,valuearg,1023,"{","}",0,0);
5549: if ( *valuearg != '\000' ) /* guard against empty string */
5550: if ( !isalpha(*valuearg) ) /* and against alpha string args */
5551: if ( !isthischar(*valuearg,"?") ) /*leading ? is query for value*/
5552: { isdelta = isthischar(*valuearg,"+-"); /* leading + or - */
5553: if ( memcmp(valuearg,"--",2) == 0 ) /* leading -- signals...*/
5554: { isdelta=0; strcpy(valuearg,valuearg+1); } /* ...not delta */
5555: argvalue = atoi(valuearg); } } /* convert to int */
5556: switch ( flag )
5557: {
5558: default: break;
5559: case ISCOLOR: /* set color */
5560: slower(valuearg); /* convert arg to lower case */
5561: if ( argvalue==1 || strstr(valuearg,"red") )
5562: { fggreen = fgblue = (isblackonwhite?0:255);
5563: fgred = (isblackonwhite?255:0); }
5564: if ( argvalue==2 || strstr(valuearg,"green") )
5565: { fgred = fgblue = (isblackonwhite?0:255);
5566: fggreen = (isblackonwhite?255:0); }
5567: if ( argvalue==3 || strstr(valuearg,"blue") )
5568: { fgred = fggreen = (isblackonwhite?0:255);
5569: fgblue = (isblackonwhite?255:0); }
5570: if ( argvalue==0 || strstr(valuearg,"black") )
5571: fgred = fggreen = fgblue = (isblackonwhite?0:255);
5572: if ( argvalue==7 || strstr(valuearg,"white") )
5573: fgred = fggreen = fgblue = (isblackonwhite?255:0);
5574: break;
5575: case ISFONTSIZE: /* set fontsize */
5576: if ( argvalue != NOVALUE ) /* got a value */
5577: { int largestsize = (issupersampling?16:LARGESTSIZE);
5578: fontsize = (isdelta? fontsize+argvalue : argvalue);
5579: fontsize = max2(0,min2(fontsize,largestsize));
5580: shrinkfactor = shrinkfactors[fontsize];
5581: if ( isdisplaystyle == 1 ) /* displaystyle enabled but not set*/
5582: if ( displaystylelevel != recurlevel ) /*respect \displaystyle*/
5583: if ( !ispreambledollars ) /* respect $$...$$'s */
5584: isdisplaystyle = (fontsize>=displaysize? 2:1); /* forced */
5585: /*displaystylelevel = (-99);*/ } /* reset \displaystyle level */
5586: else /* embed font size in expression */
5587: { sprintf(valuearg,"%d",fontsize); /* convert size */
5588: valuelen = strlen(valuearg); /* ought to be 1 */
5589: if ( *expression != '\000' ) /* ill-formed expression */
5590: { *expression = (char *)(*expression-valuelen); /*back up buff*/
5591: memcpy(*expression,valuearg,valuelen); } } /*and put in size*/
5592: break;
5593: case ISDISPLAYSIZE: /* set displaysize */
5594: if ( argvalue != NOVALUE ) /* got a value */
5595: displaysize = (isdelta? displaysize+argvalue : argvalue);
5596: break;
5597: case ISSQUASH: /* set (minimum) "squash" margin */
5598: if ( argvalue != NOVALUE ) /* got a value */
5599: { squashmargin = argvalue; /* set value */
5600: if ( arg3 != NOVALUE ) isdelta=arg3; /* hard-coded isdelta */
5601: issquashdelta = (isdelta?1:0); } /* and set delta flag */
5602: squashmargin = max2((isdelta?-5:0),min2(squashmargin,32)); /*sanity*/
5603: break;
5604: case ISSHRINK: /* set shrinkfactor */
5605: if ( argvalue != NOVALUE ) /* got a value */
5606: shrinkfactor = (isdelta? shrinkfactor+argvalue : argvalue);
5607: shrinkfactor = max2(1,min2(shrinkfactor,27)); /* sanity check */
5608: break;
5609: case ISAAALGORITHM: /* set anti-aliasing algorithm */
5610: if ( argvalue != NOVALUE ) /* got a value */
5611: aaalgorithm = argvalue; /* set algorithm number */
5612: aaalgorithm = max2(0,min2(aaalgorithm,3)); /* bounds check */
5613: break;
5614: case ISWEIGHT: /* set font weight number */
5615: value = (argvalue==NOVALUE? NOVALUE : /* don't have a value */
5616: (isdelta? weightnum+argvalue : argvalue));
5617: if ( value>=0 && value<maxaaparams ) /* in range */
5618: { weightnum = value; /* reset weightnum index */
5619: minadjacent = aaparams[weightnum].minadjacent;
5620: maxadjacent = aaparams[weightnum].maxadjacent;
5621: cornerwt = aaparams[weightnum].cornerwt;
5622: adjacentwt = aaparams[weightnum].adjacentwt;
5623: centerwt = aaparams[weightnum].centerwt;
5624: fgalias = aaparams[weightnum].fgalias;
5625: fgonly = aaparams[weightnum].fgonly;
5626: bgalias = aaparams[weightnum].bgalias;
5627: bgonly = aaparams[weightnum].bgonly; }
5628: break;
5629: case ISCENTERWT: /* set lowpass center pixel weight */
5630: if ( argvalue != NOVALUE ) /* got a value */
5631: centerwt = argvalue; /* set lowpass center weight */
5632: break;
5633: case ISADJACENTWT: /* set lowpass adjacent weight */
5634: if ( argvalue != NOVALUE ) /* got a value */
5635: adjacentwt = argvalue; /* set lowpass adjacent weight */
5636: break;
5637: case ISCORNERWT: /* set lowpass corner weight */
5638: if ( argvalue != NOVALUE ) /* got a value */
5639: cornerwt = argvalue; /* set lowpass corner weight */
5640: break;
5641: } /* --- end-of-switch() --- */
5642: break;
5643: case PNMPARAMS: /*set fgalias,fgonly,bgalias,bgonly*/
5644: *expression = texsubexpr(*expression,valuearg,1023,"{","}",0,0);
5645: valuelen = strlen(valuearg); /* ought to be 1-4 */
5646: if ( valuelen>0 && isthischar(toupper(valuearg[0]),"TY1") ) fgalias=1;
5647: if ( valuelen>0 && isthischar(toupper(valuearg[0]),"FN0") ) fgalias=0;
5648: if ( valuelen>1 && isthischar(toupper(valuearg[1]),"TY1") ) fgonly =1;
5649: if ( valuelen>1 && isthischar(toupper(valuearg[1]),"FN0") ) fgonly =0;
5650: if ( valuelen>2 && isthischar(toupper(valuearg[2]),"TY1") ) bgalias=1;
5651: if ( valuelen>2 && isthischar(toupper(valuearg[2]),"FN0") ) bgalias=0;
5652: if ( valuelen>3 && isthischar(toupper(valuearg[3]),"TY1") ) bgonly =1;
5653: if ( valuelen>3 && isthischar(toupper(valuearg[3]),"FN0") ) bgonly =0;
5654: break;
5655: case UNITLENGTH:
5656: if ( value != NOVALUE ) /* passed a fixed value to be set */
5657: unitlength = (double)(value); /* set given fixed value */
5658: else /* get value from expression */
5659: { *expression = texsubexpr(*expression,valuearg,1023,"{","}",0,0);
5660: if ( *valuearg != '\000' ) /* guard against empty string */
5661: unitlength = strtod(valuearg,NULL); } /* convert to double */
5662: break;
5663: } /* --- end-of-switch(flag) --- */
5664: return ( NULL ); /*just set value, nothing to display*/
5665: } /* --- end-of-function rastflags() --- */
5666:
5667:
5668: /* ==========================================================================
5669: * Function: rastspace(expression, size, basesp, width, isfill, isheight)
5670: * Purpose: returns a blank/space subraster width wide,
5671: * with baseline and height corresponding to basep
5672: * --------------------------------------------------------------------------
5673: * Arguments: expression (I) char ** to first char of null-terminated
5674: * LaTeX expression (unused/unchanged)
5675: * size (I) int containing base font size (not used,
5676: * just stored in subraster)
5677: * basesp (I) subraster * to character (or subexpression)
5678: * immediately preceding space, whose baseline
5679: * and height params are transferred to space
5680: * width (I) int containing #bits/pixels for space width
5681: * isfill (I) int containing true to \hfill complete
5682: * expression out to width
5683: * isheight (I) int containing true (but not NOVALUE)
5684: * to treat width arg as height
5685: * --------------------------------------------------------------------------
5686: * Returns: ( subraster * ) ptr to empty/blank subraster
5687: * or NULL for any error
5688: * --------------------------------------------------------------------------
5689: * Notes: o
5690: * ======================================================================= */
5691: /* --- entry point --- */
5692: subraster *rastspace ( char **expression, int size, subraster *basesp,
5693: int width, int isfill, int isheight )
5694: {
5695: /* -------------------------------------------------------------------------
5696: Allocations and Declarations
5697: -------------------------------------------------------------------------- */
5698: subraster *new_subraster(), *spacesp=NULL; /* subraster for space */
5699: int baseht=1, baseln=0; /* height,baseline of base symbol */
5700: int pixsz = 1; /*default #bits per pixel, 1=bitmap*/
5701: char *texsubexpr(), widtharg[256]; /* parse for optional {width} */
5702: subraster *rasterize(), *rightsp=NULL; /*rasterize right half of expression*/
5703: subraster *rastcat(); /* cat rightsp after \hfill */
5704: int blanksignal = (-991234); /*rastsquash signal right-hand blank*/
5705: /* -------------------------------------------------------------------------
5706: initialization
5707: -------------------------------------------------------------------------- */
5708: if ( isfill == NOVALUE ) isfill=0; /* novalue means false */
5709: if ( isheight == NOVALUE ) isheight=0; /* novalue means false */
5710: /* -------------------------------------------------------------------------
5711: determine width if not given (e.g., \hspace{width}, \hfill{width})
5712: -------------------------------------------------------------------------- */
5713: if ( width <= 0 ) /* width specified in expression */
5714: { int widthval; /* test {width} before using it */
5715: width = 1; /* set default width */
5716: *expression = texsubexpr(*expression,widtharg,255,"{","}",0,0);
5717: widthval = /* convert {width} to integer */
5718: (int)((unitlength*strtod(widtharg,NULL))+0.5);
5719: if ( widthval>=2 && widthval<=600 ) /* sanity check */
5720: width = widthval; } /* replace deafault width */
5721: /* -------------------------------------------------------------------------
5722: see if width is "absolute" or fill width
5723: -------------------------------------------------------------------------- */
5724: if ( isfill /* called as \hfill{} */
5725: && !isheight ) /* parameter conflict */
5726: { if ( leftexpression != NULL ) /* if we have left half */
5727: width -= (leftexpression->image)->width; /*reduce left width from total*/
5728: if ( (rightsp=rasterize(*expression,size)) /* rasterize right half */
5729: != NULL ) /* succeeded */
5730: width -= (rightsp->image)->width; } /* reduce right width from total */
5731: /* -------------------------------------------------------------------------
5732: construct blank subraster, and return it to caller
5733: -------------------------------------------------------------------------- */
5734: /* --- get parameters from base symbol --- */
5735: if ( basesp != (subraster *)NULL ) /* we have base symbol for space */
5736: { baseht = (basesp->image)->height; /* height of base symbol */
5737: baseln = basesp->baseline; } /* and its baseline */
5738: /* --- flip params for height --- */
5739: if ( isheight ) /* width is actually height */
5740: { baseht = width; /* use given width as height */
5741: width = 1; } /* and set default width */
5742: /* --- generate and init space subraster --- */
5743: if ( width > 0 ) /*make sure we have positive width*/
5744: if ( (spacesp=new_subraster(width,baseht,pixsz)) /*generate space subraster*/
5745: != NULL ) /* and if we succeed... */
5746: { /* --- ...re-init subraster parameters --- */
5747: spacesp->size = size; /*propagate base font size forward*/
5748: spacesp->baseline = baseln; } /* ditto baseline */
5749: /* -------------------------------------------------------------------------
5750: concat right half if \hfill-ing
5751: -------------------------------------------------------------------------- */
5752: if ( rightsp != NULL ) /* we have a right half after fill */
5753: { spacesp = (spacesp==NULL? rightsp: /* no space, so just use right half*/
5754: rastcat(spacesp,rightsp,3)); /* or cat right half after space */
5755: spacesp->type = blanksignal; /* need to propagate blanks */
5756: *expression += strlen((*expression)); } /* push expression to its null */
5757: return ( spacesp );
5758: } /* --- end-of-function rastspace() --- */
5759:
5760:
5761: /* ==========================================================================
5762: * Function: rastnewline ( expression, size, basesp, arg1, arg2, arg3 )
5763: * Purpose: \\ handler, returns subraster corresponding to
5764: * left-hand expression preceding \\ above right-hand expression
5765: * --------------------------------------------------------------------------
5766: * Arguments: expression (I/O) char ** to first char of null-terminated
5767: * string immediately following \\ to be
5768: * rasterized, and returning ptr immediately
5769: * to terminating null.
5770: * size (I) int containing 0-4 default font size
5771: * basesp (I) subraster * to character (or subexpression)
5772: * immediately preceding \accent
5773: * (unused, but passed for consistency)
5774: * arg1 (I) int unused
5775: * arg2 (I) int unused
5776: * arg3 (I) int unused
5777: * --------------------------------------------------------------------------
5778: * Returns: ( subraster * ) ptr to subraster corresponding to expression,
5779: * or NULL for any parsing error
5780: * (expression ptr unchanged if error occurs)
5781: * --------------------------------------------------------------------------
5782: * Notes: o
5783: * ======================================================================= */
5784: /* --- entry point --- */
5785: subraster *rastnewline ( char **expression, int size, subraster *basesp,
5786: int arg1, int arg2, int arg3 )
5787: {
5788: /* -------------------------------------------------------------------------
5789: Allocations and Declarations
5790: -------------------------------------------------------------------------- */
5791: subraster *rastack(), *newlsp=NULL; /* subraster for both lines */
5792: subraster *rasterize(), *rightsp=NULL; /*rasterize right half of expression*/
5793: char *texsubexpr(), spacexpr[129]/*, *xptr=spacexpr*/; /*for \\[vspace]*/
5794: double strtod(); /* convert ascii param to double */
5795: int vspace = size+2; /* #pixels between lines */
5796: /* -------------------------------------------------------------------------
5797: obtain optional [vspace] argument immediately following \\ command
5798: -------------------------------------------------------------------------- */
5799: /* --- check if [vspace] given --- */
5800: if ( *(*expression) == '[' ) /*have [vspace] if leading char is [*/
5801: {
5802: /* ---parse [vspace] and bump expression past it, interpret as double--- */
5803: *expression = texsubexpr(*expression,spacexpr,127,"[","]",0,0);
5804: if ( *spacexpr == '\000' ) goto end_of_job; /* couldn't get [vspace] */
5805: vspace = iround(unitlength*strtod(spacexpr,NULL)); /* vspace in pixels */
5806: } /* --- end-of-if(*(*expression)=='[') --- */
5807: if ( leftexpression == NULL ) goto end_of_job; /* nothing preceding \\ */
5808: /* -------------------------------------------------------------------------
5809: rasterize right half of expression and stack left half above it
5810: -------------------------------------------------------------------------- */
5811: /* --- rasterize right half --- */
5812: if ( (rightsp=rasterize(*expression,size)) /* rasterize right half */
5813: == NULL ) goto end_of_job; /* quit if failed */
5814: /* --- stack left half above it --- */
5815: newlsp = rastack(rightsp,leftexpression,1,vspace,0,3); /*right under left*/
5816: /* --- back to caller --- */
5817: end_of_job:
5818: if ( newlsp != NULL ) /* returning entire expression */
5819: { int newht = (newlsp->image)->height; /* height of returned subraster */
5820: newlsp->baseline = min2(newht-1,newht/2+5); /* guess new baseline */
5821: isreplaceleft = 1; /* so set flag to replace left half*/
5822: *expression += strlen(*expression); } /* and push to terminating null*/
5823: return ( newlsp ); /* 1st line over 2nd, or null=error*/
5824: } /* --- end-of-function rastnewline() --- */
5825:
5826:
5827: /* ==========================================================================
5828: * Function: rastarrow ( expression, size, basesp, drctn, isBig, arg3 )
5829: * Purpose: returns left/right arrow subraster (e.g., for \longrightarrow)
5830: * --------------------------------------------------------------------------
5831: * Arguments: expression (I) char ** to first char of null-terminated
5832: * LaTeX expression (unused/unchanged)
5833: * size (I) int containing base font size (not used,
5834: * just stored in subraster)
5835: * basesp (I) subraster * to character (or subexpression)
5836: * immediately preceding space, whose baseline
5837: * and height params are transferred to space
5838: * drctn (I) int containing +1 for right, -1 for left,
5839: * or 0 for leftright
5840: * isBig (I) int containing 0 for ---> or 1 for ===>
5841: * arg3 (I) int unused
5842: * --------------------------------------------------------------------------
5843: * Returns: ( subraster * ) ptr to left/right arrow subraster
5844: * or NULL for any error
5845: * --------------------------------------------------------------------------
5846: * Notes: o An optional argument [width] may *immediately* follow
5847: * the \longxxx to explicitly set the arrow's width in pixels.
5848: * For example, \longrightarrow calculates a default width
5849: * (as usual in LaTeX), whereas \longrightarrow[50] explicitly
5850: * draws a 50-pixel long arrow. This can be used, e.g.,
5851: * to draw commutative diagrams in conjunction with
5852: * \array (and maybe with \stackrel and/or \relstack, too).
5853: * o In case you really want to render, say, [f]---->[g], just
5854: * use an intervening space, i.e., [f]\longrightarrow~[g].
5855: * In text mode use two spaces {\rm~[f]\longrightarrow~~[g]}.
5856: * ======================================================================= */
5857: /* --- entry point --- */
5858: subraster *rastarrow ( char **expression, int size, subraster *basesp,
5859: int drctn, int isBig, int arg3 )
5860: {
5861: /* -------------------------------------------------------------------------
5862: Allocations and Declarations
5863: -------------------------------------------------------------------------- */
5864: subraster *arrow_subraster(), *arrowsp=NULL; /* subraster for arrow */
5865: char *texsubexpr(), widtharg[256]; /* parse for optional [width] */
5866: char *texscripts(), sub[1024],super[1024]; /* and _^limits after [width]*/
5867: subraster *rasterize(), *subsp=NULL,*supsp=NULL; /*rasterize limits*/
5868: subraster *new_subraster(), *rastack(), *spacesp=NULL; /*space below arrow*/
5869: int delete_subraster(); /*free work areas in case of error*/
5870: double strtod(); /* convert ascii [width] to value */
5871: int width = 10 + 8*size, height; /* width, height for \longxxxarrow */
5872: int islimits = 1; /*true to handle limits internally*/
5873: int limsize = size-1; /* font size for limits */
5874: int vspace = 1; /* #empty rows below arrow */
5875: int pixsz = 1; /*default #bits per pixel, 1=bitmap*/
5876: /* -------------------------------------------------------------------------
5877: construct longleft/rightarrow subraster, with limits, and return it to caller
5878: -------------------------------------------------------------------------- */
5879: /* --- check for optional width arg and replace default width --- */
5880: if ( *(*expression) == '[' ) /*check for []-enclosed optional arg*/
5881: { int widthval; /* test [width] before using it */
5882: *expression = texsubexpr(*expression,widtharg,255,"[","]",0,0);
5883: widthval = /* convert [width] to integer */
5884: (int)((unitlength*strtod(widtharg,NULL))+0.5);
5885: if ( widthval>=2 && widthval<=600 ) /* sanity check */
5886: width = widthval; } /* replace deafault width */
5887: /* --- now parse for limits, and bump expression past it(them) --- */
5888: if ( islimits ) /* handling limits internally */
5889: { *expression = texscripts(*expression,sub,super,3); /* parse for limits */
5890: if ( *sub != '\000' ) /*have a subscript following arrow*/
5891: subsp = rasterize(sub,limsize); /* so try to rasterize subscript */
5892: if ( *super != '\000' ) /*have superscript following arrow*/
5893: supsp = rasterize(super,limsize); } /*so try to rasterize superscript*/
5894: /* --- set height based on width --- */
5895: height = min2(17,max2(9,(width+2)/6)); /* height based on width */
5896: height = 1 + (height/2)*2; /* always force odd height */
5897: /* --- generate arrow subraster --- */
5898: if ( (arrowsp=arrow_subraster(width,height,pixsz,drctn,isBig)) /*build arrow*/
5899: == NULL ) goto end_of_job; /* and quit if we failed */
5900: /* --- add space below arrow --- */
5901: if ( vspace > 0 ) /* if we have space below arrow */
5902: if ( (spacesp=new_subraster(width,vspace,pixsz)) /*allocate required space*/
5903: != NULL ) /* and if we succeeded */
5904: if ( (arrowsp = rastack(spacesp,arrowsp,2,0,1,3)) /* space below arrow */
5905: == NULL ) goto end_of_job; /* and quit if we failed */
5906: /* --- init arrow subraster parameters --- */
5907: arrowsp->size = size; /*propagate base font size forward*/
5908: arrowsp->baseline = height+vspace-1; /* set baseline at bottom of arrow */
5909: /* --- add limits above/below arrow, as necessary --- */
5910: if ( subsp != NULL ) /* stack subscript below arrow */
5911: if ( (arrowsp = rastack(subsp,arrowsp,2,0,1,3)) /* subscript below arrow */
5912: == NULL ) goto end_of_job; /* quit if failed */
5913: if ( supsp != NULL ) /* stack superscript above arrow */
5914: if ( (arrowsp = rastack(arrowsp,supsp,1,vspace,1,3)) /*supsc above arrow*/
5915: == NULL ) goto end_of_job; /* quit if failed */
5916: /* --- return arrow (or NULL) to caller --- */
5917: end_of_job:
5918: return ( arrowsp );
5919: } /* --- end-of-function rastarrow() --- */
5920:
5921:
5922: /* ==========================================================================
5923: * Function: rastuparrow ( expression, size, basesp, drctn, isBig, arg3 )
5924: * Purpose: returns an up/down arrow subraster (e.g., for \longuparrow)
5925: * --------------------------------------------------------------------------
5926: * Arguments: expression (I) char ** to first char of null-terminated
5927: * LaTeX expression (unused/unchanged)
5928: * size (I) int containing base font size (not used,
5929: * just stored in subraster)
5930: * basesp (I) subraster * to character (or subexpression)
5931: * immediately preceding space, whose baseline
5932: * and height params are transferred to space
5933: * drctn (I) int containing +1 for up, -1 for down,
5934: * or 0 for updown
5935: * isBig (I) int containing 0 for ---> or 1 for ===>
5936: * arg3 (I) int unused
5937: * --------------------------------------------------------------------------
5938: * Returns: ( subraster * ) ptr to up/down arrow subraster
5939: * or NULL for any error
5940: * --------------------------------------------------------------------------
5941: * Notes: o An optional argument [height] may *immediately* follow
5942: * the \longxxx to explicitly set the arrow's height in pixels.
5943: * For example, \longuparrow calculates a default height
5944: * (as usual in LaTeX), whereas \longuparrow[25] explicitly
5945: * draws a 25-pixel high arrow. This can be used, e.g.,
5946: * to draw commutative diagrams in conjunction with
5947: * \array (and maybe with \stackrel and/or \relstack, too).
5948: * o In case you really want to render, say, [f]---->[g], just
5949: * use an intervening space, i.e., [f]\longuparrow~[g].
5950: * In text use two spaces {\rm~[f]\longuparrow~~[g]}.
5951: * ======================================================================= */
5952: /* --- entry point --- */
5953: subraster *rastuparrow ( char **expression, int size, subraster *basesp,
5954: int drctn, int isBig, int arg3 )
5955: {
5956: /* -------------------------------------------------------------------------
5957: Allocations and Declarations
5958: -------------------------------------------------------------------------- */
5959: subraster *uparrow_subraster(), *arrowsp=NULL; /* subraster for arrow */
5960: char *texsubexpr(), heightarg[256]; /* parse for optional [height] */
5961: char *texscripts(), sub[1024],super[1024]; /* and _^limits after [width]*/
5962: subraster *rasterize(), *subsp=NULL,*supsp=NULL; /*rasterize limits*/
5963: subraster *rastcat(); /* cat superscript left, sub right */
5964: double strtod(); /* convert ascii [height] to value */
5965: int height = 8 + 2*size, width; /* height, width for \longxxxarrow */
5966: int islimits = 1; /*true to handle limits internally*/
5967: int limsize = size-1; /* font size for limits */
5968: int pixsz = 1; /*default #bits per pixel, 1=bitmap*/
5969: /* -------------------------------------------------------------------------
5970: construct blank subraster, and return it to caller
5971: -------------------------------------------------------------------------- */
5972: /* --- check for optional height arg and replace default height --- */
5973: if ( *(*expression) == '[' ) /*check for []-enclosed optional arg*/
5974: { int heightval; /* test height before using it */
5975: *expression = texsubexpr(*expression,heightarg,255,"[","]",0,0);
5976: heightval = /* convert [height] to integer */
5977: (int)((unitlength*strtod(heightarg,NULL))+0.5);
5978: if ( heightval>=2 && heightval<=600 ) /* sanity check */
5979: height = heightval; } /* replace deafault height */
5980: /* --- now parse for limits, and bump expression past it(them) --- */
5981: if ( islimits ) /* handling limits internally */
5982: { *expression = texscripts(*expression,sub,super,3); /* parse for limits */
5983: if ( *sub != '\000' ) /*have a subscript following arrow*/
5984: subsp = rasterize(sub,limsize); /* so try to rasterize subscript */
5985: if ( *super != '\000' ) /*have superscript following arrow*/
5986: supsp = rasterize(super,limsize); } /*so try to rasterize superscript*/
5987: /* --- set width based on height --- */
5988: width = min2(17,max2(9,(height+2)/4)); /* width based on height */
5989: width = 1 + (width/2)*2; /* always force odd width */
5990: /* --- generate arrow subraster --- */
5991: if ( (arrowsp=uparrow_subraster(width,height,pixsz,drctn,isBig)) /*build arr*/
5992: == NULL ) goto end_of_job; /* and quit if we failed */
5993: /* --- init arrow subraster parameters --- */
5994: arrowsp->size = size; /*propagate base font size forward*/
5995: arrowsp->baseline = height-1; /* set baseline at bottom of arrow */
5996: /* --- add limits above/below arrow, as necessary --- */
5997: if ( supsp != NULL ) /* cat superscript to left of arrow*/
5998: { int supht = (supsp->image)->height, /* superscript height */
5999: deltab = (1+abs(height-supht))/2; /* baseline difference to center */
6000: supsp->baseline = supht-1; /* force script baseline to bottom */
6001: if ( supht <= height ) /* arrow usually taller than script*/
6002: arrowsp->baseline -= deltab; /* so bottom of script goes here */
6003: else supsp->baseline -= deltab; /* else bottom of arrow goes here */
6004: if ( (arrowsp = rastcat(supsp,arrowsp,3)) /* superscript left of arrow */
6005: == NULL ) goto end_of_job; } /* quit if failed */
6006: if ( subsp != NULL ) /* cat subscript to right of arrow */
6007: { int subht = (subsp->image)->height, /* subscript height */
6008: deltab = (1+abs(height-subht))/2; /* baseline difference to center */
6009: arrowsp->baseline = height-1; /* reset arrow baseline to bottom */
6010: subsp->baseline = subht-1; /* force script baseline to bottom */
6011: if ( subht <= height ) /* arrow usually taller than script*/
6012: arrowsp->baseline -= deltab; /* so bottom of script goes here */
6013: else subsp->baseline -= deltab; /* else bottom of arrow goes here */
6014: if ( (arrowsp = rastcat(arrowsp,subsp,3)) /* subscript right of arrow */
6015: == NULL ) goto end_of_job; } /* quit if failed */
6016: /* --- return arrow (or NULL) to caller --- */
6017: end_of_job:
6018: arrowsp->baseline = height-1; /* reset arrow baseline to bottom */
6019: return ( arrowsp );
6020: } /* --- end-of-function rastuparrow() --- */
6021:
6022:
6023: /* ==========================================================================
6024: * Function: rastoverlay (expression, size, basesp, overlay, offset2, arg3)
6025: * Purpose: overlays one raster on another
6026: * --------------------------------------------------------------------------
6027: * Arguments: expression (I/O) char ** to first char of null-terminated
6028: * string immediately following overlay \cmd to
6029: * be rasterized, and returning ptr immediately
6030: * following last character processed.
6031: * size (I) int containing 0-5 default font size
6032: * basesp (I) subraster * to character (or subexpression)
6033: * immediately preceding overlay \cmd
6034: * (unused, but passed for consistency)
6035: * overlay (I) int containing 1 to overlay / (e.g., \not)
6036: * or NOVALUE to pick up 2nd arg from expression
6037: * offset2 (I) int containing #pixels to horizontally offset
6038: * overlay relative to underlying symbol,
6039: * positive(right) or negative or 0,
6040: * or NOVALUE to pick up optional [offset] arg
6041: * arg3 (I) int unused
6042: * --------------------------------------------------------------------------
6043: * Returns: ( subraster * ) ptr to subraster corresponding to composite,
6044: * or NULL for any parsing error
6045: * --------------------------------------------------------------------------
6046: * Notes: o
6047: * ======================================================================= */
6048: /* --- entry point --- */
6049: subraster *rastoverlay ( char **expression, int size, subraster *basesp,
6050: int overlay, int offset2, int arg3 )
6051: {
6052: /* -------------------------------------------------------------------------
6053: Allocations and Declarations
6054: -------------------------------------------------------------------------- */
6055: char *texsubexpr(), /*parse expression for base,overlay*/
6056: expr1[512], expr2[512]; /* base, overlay */
6057: subraster *rasterize(), *sp1=NULL, *sp2=NULL, /*rasterize 1=base, 2=overlay*/
6058: *new_subraster(); /*explicitly alloc sp2 if necessary*/
6059: subraster *rastcompose(), *overlaysp=NULL; /*subraster for composite overlay*/
6060: int line_raster(); /* draw diagonal for \Not */
6061: /* -------------------------------------------------------------------------
6062: Obtain base, and maybe overlay, and rasterize them
6063: -------------------------------------------------------------------------- */
6064: /* --- check for optional offset2 arg --- */
6065: if ( offset2 == NOVALUE ) /* only if not explicitly specified*/
6066: if ( *(*expression) == '[' ) /*check for []-enclosed optional arg*/
6067: { int offsetval; /* test before using it */
6068: *expression = texsubexpr(*expression,expr2,511,"[","]",0,0);
6069: offsetval = (int)(strtod(expr2,NULL)+0.5); /* convert [offset2] to int */
6070: if ( abs(offsetval) <= 25 ) /* sanity check */
6071: offset2 = offsetval; } /* replace deafault */
6072: if ( offset2 == NOVALUE ) offset2 = 0; /* novalue means no offset */
6073: /* --- parse for base, bump expression past it, and rasterize it --- */
6074: *expression = texsubexpr(*expression,expr1,511,"{","}",0,0);
6075: if ( *expr1 == '\000' ) goto end_of_job; /* nothing to overlay, so quit */
6076: if ( (sp1=rasterize(expr1,size)) /* rasterize base expression */
6077: == NULL ) goto end_of_job; /* quit if failed to rasterize */
6078: overlaysp = sp1; /*in case we return with no overlay*/
6079: /* --- get overlay expression, and rasterize it --- */
6080: if ( overlay == NOVALUE ) /* get overlay from input stream */
6081: { *expression = texsubexpr(*expression,expr2,511,"{","}",0,0);
6082: if ( *expr2 != '\000' ) /* have an overlay */
6083: sp2 = rasterize(expr2,size); } /* so rasterize overlay expression */
6084: else /* specific overlay */
6085: switch ( overlay )
6086: {
6087: default: break;
6088: case 1: /* e.g., \not overlays slash */
6089: sp2 = rasterize("/",size+1); /* rasterize overlay expression */
6090: offset2 = max2(1,size-3); /* push / right a bit */
6091: offset2 = 0;
6092: break;
6093: case 2: /* e.g., \Not draws diagonal */
6094: sp2 = NULL; /* no overlay required */
6095: if ( overlaysp != NULL ) /* check that we have raster */
6096: { raster *rp = overlaysp->image; /* raster to be \Not-ed */
6097: int width=rp->width, height=rp->height; /* raster dimensions */
6098: if ( 0 ) /* diagonal within bounding box */
6099: line_raster(rp,0,width-1,height-1,0,1); /* just draw diagonal */
6100: else /* construct "wide" diagonal */
6101: { int margin=3; /* desired extra margin width */
6102: sp2 = new_subraster(width+margin,height+margin,1); /*alloc it*/
6103: if ( sp2 != NULL ) /* allocated successfully */
6104: line_raster(sp2->image,0,width+margin-1,height+margin-1,0,1);}}
6105: break;
6106: case 3: /* e.g., \sout for strikeout */
6107: sp2 = NULL; /* no overlay required */
6108: if ( overlaysp != NULL ) /* check that we have raster */
6109: { raster *rp = overlaysp->image; /* raster to be \Not-ed */
6110: int width=rp->width, height=rp->height; /* raster dimensions */
6111: int baseline = overlaysp->baseline; /* we'll ignore descenders */
6112: int midrow = max2(0,min2(height-1,offset2+((baseline+1)/2)));
6113: if ( 1 ) /* strikeout within bounding box */
6114: line_raster(rp,midrow,0,midrow,width-1,1); } /*draw strikeout*/
6115: break;
6116: } /* --- end-of-switch(overlay) --- */
6117: if ( sp2 == NULL ) goto end_of_job; /*return sp1 if failed to rasterize*/
6118: /* -------------------------------------------------------------------------
6119: construct composite overlay
6120: -------------------------------------------------------------------------- */
6121: overlaysp = rastcompose(sp1,sp2,offset2,0,3);
6122: end_of_job:
6123: return ( overlaysp );
6124: } /* --- end-of-function rastoverlay() --- */
6125:
6126:
6127: /* ==========================================================================
6128: * Function: rastfrac ( expression, size, basesp, isfrac, arg2, arg3 )
6129: * Purpose: \frac,\atop handler, returns a subraster corresponding to
6130: * expression (immediately following \frac,\atop) at font size
6131: * --------------------------------------------------------------------------
6132: * Arguments: expression (I/O) char ** to first char of null-terminated
6133: * string immediately following \frac to be
6134: * rasterized, and returning ptr immediately
6135: * following last character processed.
6136: * size (I) int containing 0-5 default font size
6137: * basesp (I) subraster * to character (or subexpression)
6138: * immediately preceding \frac
6139: * (unused, but passed for consistency)
6140: * isfrac (I) int containing true to draw horizontal line
6141: * between numerator and denominator,
6142: * or false not to draw it (for \atop).
6143: * arg2 (I) int unused
6144: * arg3 (I) int unused
6145: * --------------------------------------------------------------------------
6146: * Returns: ( subraster * ) ptr to subraster corresponding to fraction,
6147: * or NULL for any parsing error
6148: * --------------------------------------------------------------------------
6149: * Notes: o
6150: * ======================================================================= */
6151: /* --- entry point --- */
6152: subraster *rastfrac ( char **expression, int size, subraster *basesp,
6153: int isfrac, int arg2, int arg3 )
6154: {
6155: /* -------------------------------------------------------------------------
6156: Allocations and Declarations
6157: -------------------------------------------------------------------------- */
6158: char *texsubexpr(), /*parse expression for numer,denom*/
6159: numer[8192], denom[8192]; /*numer,denom parsed from expression*/
6160: subraster *rasterize(), *numsp=NULL, *densp=NULL; /*rasterize numer, denom*/
6161: subraster *rastack(), *fracsp=NULL; /* subraster for numer/denom */
6162: subraster *new_subraster()/*, *spacesp=NULL*/; /* space for num or den */
6163: int width=0, /* width of constructed raster */
6164: numheight=0; /* height of numerator */
6165: int baseht=0, baseln=0; /* height,baseline of base symbol */
6166: /*int istweak = 1;*/ /*true to tweak baseline alignment*/
6167: int rule_raster(), /* draw horizontal line for frac */
6168: lineheight = 1; /* thickness of fraction line */
6169: int vspace = 1; /*vertical space between components*/
6170: int delete_subraster(); /*free work areas in case of error*/
6171: int type_raster(); /* display debugging output */
6172: /* -------------------------------------------------------------------------
6173: Obtain numerator and denominator, and rasterize them
6174: -------------------------------------------------------------------------- */
6175: /* --- parse for numerator,denominator and bump expression past them --- */
6176: *expression = texsubexpr(*expression,numer,0,"{","}",0,0);
6177: *expression = texsubexpr(*expression,denom,0,"{","}",0,0);
6178: if ( *numer=='\000' && *denom=='\000' ) /* missing both components of frac */
6179: goto end_of_job; /* nothing to do, so quit */
6180: /* --- rasterize numerator, denominator --- */
6181: if ( *numer != '\000' ) /* have a numerator */
6182: if ( (numsp = rasterize(numer,size-1)) /* so rasterize numer at size-1 */
6183: == NULL ) goto end_of_job; /* and quit if failed */
6184: if ( *denom != '\000' ) /* have a denominator */
6185: if ( (densp = rasterize(denom,size-1)) /* so rasterize denom at size-1 */
6186: == NULL ) /* failed */
6187: { if ( numsp != NULL ) /* already rasterized numerator */
6188: delete_subraster(numsp); /* so free now-unneeded numerator */
6189: goto end_of_job; } /* and quit */
6190: /* --- if one componenet missing, use a blank space for it --- */
6191: if ( numsp == NULL ) /* no numerator given */
6192: numsp = rasterize("[?]",size-1); /* missing numerator */
6193: if ( densp == NULL ) /* no denominator given */
6194: densp = rasterize("[?]",size-1); /* missing denominator */
6195: /* --- check that we got both components --- */
6196: if ( numsp==NULL || densp==NULL ) /* some problem */
6197: { delete_subraster(numsp); /*delete numerator (if it existed)*/
6198: delete_subraster(densp); /*delete denominator (if it existed)*/
6199: goto end_of_job; } /* and quit */
6200: /* --- get height of numerator (to determine where line belongs) --- */
6201: numheight = (numsp->image)->height; /* get numerator's height */
6202: /* -------------------------------------------------------------------------
6203: construct raster with numerator stacked over denominator
6204: -------------------------------------------------------------------------- */
6205: /* --- construct raster with numer/denom --- */
6206: if ( (fracsp = rastack(densp,numsp,0,2*vspace+lineheight,1,3))/*numer/denom*/
6207: == NULL ) /* failed to construct numer/denom */
6208: { delete_subraster(numsp); /* so free now-unneeded numerator */
6209: delete_subraster(densp); /* and now-unneeded denominator */
6210: goto end_of_job; } /* and then quit */
6211: /* --- determine width of constructed raster --- */
6212: width = (fracsp->image)->width; /*just get width of embedded image*/
6213: /* --- initialize subraster parameters --- */
6214: fracsp->size = size; /* propagate font size forward */
6215: fracsp->baseline = (numheight+vspace+lineheight)+(size+2);/*default baseline*/
6216: if ( basesp != (subraster *)NULL ) /* we have base symbol for frac */
6217: { baseht = (basesp->image)->height; /* height of base symbol */
6218: baseln = basesp->baseline; /* and its baseline */
6219: } /* --- end-of-if(basesp!=NULL) --- */
6220: /* -------------------------------------------------------------------------
6221: draw horizontal line between numerator and denominator
6222: -------------------------------------------------------------------------- */
6223: if ( isfrac ) /*line for \frac, but not for \atop*/
6224: rule_raster(fracsp->image,numheight+vspace,0,width,lineheight,0);
6225: /* -------------------------------------------------------------------------
6226: return final result to caller
6227: -------------------------------------------------------------------------- */
6228: end_of_job:
6229: if ( msgfp!=NULL && msglevel>=99 )
6230: { fprintf(msgfp,"rastfrac> returning %s\n",(fracsp==NULL?"null":"..."));
6231: if ( fracsp != NULL ) /* have a constructed raster */
6232: type_raster(fracsp->image,msgfp); } /* display constructed raster */
6233: return ( fracsp );
6234: } /* --- end-of-function rastfrac() --- */
6235:
6236:
6237: /* ==========================================================================
6238: * Function: rastackrel ( expression, size, basesp, base, arg2, arg3 )
6239: * Purpose: \stackrel handler, returns a subraster corresponding to
6240: * stacked relation
6241: * --------------------------------------------------------------------------
6242: * Arguments: expression (I/O) char ** to first char of null-terminated
6243: * string immediately following \stackrel to be
6244: * rasterized, and returning ptr immediately
6245: * following last character processed.
6246: * size (I) int containing 0-4 default font size
6247: * basesp (I) subraster * to character (or subexpression)
6248: * immediately preceding \stackrel
6249: * (unused, but passed for consistency)
6250: * base (I) int containing 1 if upper/first subexpression
6251: * is base relation, or 2 if lower/second is
6252: * arg2 (I) int unused
6253: * arg3 (I) int unused
6254: * --------------------------------------------------------------------------
6255: * Returns: ( subraster * ) ptr to subraster corresponding to stacked
6256: * relation, or NULL for any parsing error
6257: * --------------------------------------------------------------------------
6258: * Notes: o
6259: * ======================================================================= */
6260: /* --- entry point --- */
6261: subraster *rastackrel ( char **expression, int size, subraster *basesp,
6262: int base, int arg2, int arg3 )
6263: {
6264: /* -------------------------------------------------------------------------
6265: Allocations and Declarations
6266: -------------------------------------------------------------------------- */
6267: char *texsubexpr(), /*parse expression for numer,denom*/
6268: upper[8192], lower[8192]; /*upper,lower parsed from expression*/
6269: subraster *rasterize(), *upsp=NULL, *lowsp=NULL; /* rasterize upper, lower */
6270: subraster *rastack(), *relsp=NULL; /* subraster for upper/lower */
6271: int upsize = (base==1? size:size-1), /* font size for upper component */
6272: lowsize = (base==2? size:size-1); /* font size for lower component */
6273: int vspace = 1; /*vertical space between components*/
6274: int delete_subraster(); /*free work areas in case of error*/
6275: /* -------------------------------------------------------------------------
6276: Obtain numerator and denominator, and rasterize them
6277: -------------------------------------------------------------------------- */
6278: /* --- parse for numerator,denominator and bump expression past them --- */
6279: *expression = texsubexpr(*expression,upper,0,"{","}",0,0);
6280: *expression = texsubexpr(*expression,lower,0,"{","}",0,0);
6281: if ( *upper=='\000' || *lower=='\000' ) /* missing either component */
6282: goto end_of_job; /* nothing to do, so quit */
6283: /* --- rasterize upper, lower --- */
6284: if ( *upper != '\000' ) /* have upper component */
6285: if ( (upsp = rasterize(upper,upsize)) /* so rasterize upper component */
6286: == NULL ) goto end_of_job; /* and quit if failed */
6287: if ( *lower != '\000' ) /* have lower component */
6288: if ( (lowsp = rasterize(lower,lowsize)) /* so rasterize lower component */
6289: == NULL ) /* failed */
6290: { if ( upsp != NULL ) /* already rasterized upper */
6291: delete_subraster(upsp); /* so free now-unneeded upper */
6292: goto end_of_job; } /* and quit */
6293: /* -------------------------------------------------------------------------
6294: construct stacked relation raster
6295: -------------------------------------------------------------------------- */
6296: /* --- construct stacked relation --- */
6297: if ( (relsp = rastack(lowsp,upsp,3-base,vspace,1,3)) /* stacked relation */
6298: == NULL ) goto end_of_job; /* quit if failed */
6299: /* --- initialize subraster parameters --- */
6300: relsp->size = size; /* propagate font size forward */
6301: /* -------------------------------------------------------------------------
6302: return final result to caller
6303: -------------------------------------------------------------------------- */
6304: end_of_job:
6305: return ( relsp );
6306: } /* --- end-of-function rastackrel() --- */
6307:
6308:
6309: /* ==========================================================================
6310: * Function: rastmathfunc ( expression, size, basesp, base, arg2, arg3 )
6311: * Purpose: \log, \lim, etc handler, returns a subraster corresponding
6312: * to math functions
6313: * --------------------------------------------------------------------------
6314: * Arguments: expression (I/O) char ** to first char of null-terminated
6315: * string immediately following \mathfunc to be
6316: * rasterized, and returning ptr immediately
6317: * following last character processed.
6318: * size (I) int containing 0-4 default font size
6319: * basesp (I) subraster * to character (or subexpression)
6320: * immediately preceding \mathfunc
6321: * (unused, but passed for consistency)
6322: * mathfunc (I) int containing 1=arccos, 2=arcsin, etc.
6323: * islimits (I) int containing 1 if function may have
6324: * limits underneath, e.g., \lim_{n\to\infty}
6325: * arg3 (I) int unused
6326: * --------------------------------------------------------------------------
6327: * Returns: ( subraster * ) ptr to subraster corresponding to mathfunc,
6328: * or NULL for any parsing error
6329: * --------------------------------------------------------------------------
6330: * Notes: o
6331: * ======================================================================= */
6332: /* --- entry point --- */
6333: subraster *rastmathfunc ( char **expression, int size, subraster *basesp,
6334: int mathfunc, int islimits, int arg3 )
6335: {
6336: /* -------------------------------------------------------------------------
6337: Allocations and Declarations
6338: -------------------------------------------------------------------------- */
6339: char *texscripts(), /* parse expression for _limits */
6340: func[4096], limits[8192]; /* func as {\rm func}, limits */
6341: char *texsubexpr(), /* parse expression for arg */
6342: funcarg[2048]; /* optional func arg */
6343: subraster *rasterize(), *funcsp=NULL, *limsp=NULL; /*rasterize func,limits*/
6344: subraster *rastack(), *mathfuncsp=NULL; /* subraster for mathfunc/limits */
6345: int limsize = size-1; /* font size for limits */
6346: int vspace = 1; /*vertical space between components*/
6347: int delete_subraster(); /*free work areas in case of error*/
6348: /* --- table of function names by mathfunc number --- */
6349: static int numnames = 34; /* number of names in table */
6350: static char *funcnames[] = {
6351: "error", /* 0 index is illegal/error bucket*/
6352: "arccos", "arcsin", "arctan", /* 1 - 3 */
6353: "arg", "cos", "cosh", /* 4 - 6 */
6354: "cot", "coth", "csc", /* 7 - 9 */
6355: "deg", "det", "dim", /* 10 - 12 */
6356: "exp", "gcd", "hom", /* 13 - 15 */
6357: "inf", "ker", "lg", /* 16 - 18 */
6358: "lim", "liminf", "limsup", /* 19 - 21 */
6359: "ln", "log", "max", /* 22 - 24 */
6360: "min", "Pr", "sec", /* 25 - 27 */
6361: "sin", "sinh", "sup", /* 28 - 30 */
6362: "tan", "tanh", /* 31 - 32 */
6363: /* --- extra mimetex funcnames --- */
6364: "tr", /* 33 */
6365: "pmod" /* 34 */
6366: } ;
6367: /* -------------------------------------------------------------------------
6368: set up and rasterize function name in \rm
6369: -------------------------------------------------------------------------- */
6370: if ( mathfunc<0 || mathfunc>numnames ) mathfunc=0; /* check index bounds */
6371: switch ( mathfunc ) /* check for special processing */
6372: {
6373: default: /* no special processing */
6374: strcpy(func,"{\\rm~"); /* init string with {\rm~ */
6375: strcat(func,funcnames[mathfunc]); /* concat function name */
6376: strcat(func,"}"); /* and add terminating } */
6377: break;
6378: case 34: /* \pmod{x} --> (mod x) */
6379: /* --- parse for \pmod{arg} argument --- */
6380: *expression = texsubexpr(*expression,funcarg,2047,"{","}",0,0);
6381: strcpy(func,"{\\({\\rm~mod}"); /* init with {\left({\rm~mod} */
6382: strcat(func,"\\hspace2"); /* concat space */
6383: strcat(func,funcarg); /* and \pmodargument */
6384: strcat(func,"\\)}"); /* and add terminating \right)} */
6385: break;
6386: } /* --- end-of-switch(mathfunc) --- */
6387: if ( (funcsp = rasterize(func,size)) /* rasterize function name */
6388: == NULL ) goto end_of_job; /* and quit if failed */
6389: mathfuncsp = funcsp; /* just return funcsp if no limits */
6390: if ( !islimits ) goto end_of_job; /* treat any subscript normally */
6391: /* -------------------------------------------------------------------------
6392: Obtain limits, if permitted and if provided, and rasterize them
6393: -------------------------------------------------------------------------- */
6394: /* --- parse for subscript limits, and bump expression past it(them) --- */
6395: *expression = texscripts(*expression,limits,limits,1);
6396: if ( *limits=='\000') goto end_of_job; /* no limits, nothing to do, quit */
6397: /* --- rasterize limits --- */
6398: if ( (limsp = rasterize(limits,limsize)) /* rasterize limits */
6399: == NULL ) goto end_of_job; /* and quit if failed */
6400: /* -------------------------------------------------------------------------
6401: construct func atop limits
6402: -------------------------------------------------------------------------- */
6403: /* --- construct func atop limits --- */
6404: if ( (mathfuncsp = rastack(limsp,funcsp,2,vspace,1,3)) /* func atop limits */
6405: == NULL ) goto end_of_job; /* quit if failed */
6406: /* --- initialize subraster parameters --- */
6407: mathfuncsp->size = size; /* propagate font size forward */
6408: /* -------------------------------------------------------------------------
6409: return final result to caller
6410: -------------------------------------------------------------------------- */
6411: end_of_job:
6412: return ( mathfuncsp );
6413: } /* --- end-of-function rastmathfunc() --- */
6414:
6415:
6416: /* ==========================================================================
6417: * Function: rastsqrt ( expression, size, basesp, arg1, arg2, arg3 )
6418: * Purpose: \sqrt handler, returns a subraster corresponding to
6419: * expression (immediately following \sqrt) at font size
6420: * --------------------------------------------------------------------------
6421: * Arguments: expression (I/O) char ** to first char of null-terminated
6422: * string immediately following \sqrt to be
6423: * rasterized, and returning ptr immediately
6424: * following last character processed.
6425: * size (I) int containing 0-4 default font size
6426: * basesp (I) subraster * to character (or subexpression)
6427: * immediately preceding \accent
6428: * (unused, but passed for consistency)
6429: * arg1 (I) int unused
6430: * arg2 (I) int unused
6431: * arg3 (I) int unused
6432: * --------------------------------------------------------------------------
6433: * Returns: ( subraster * ) ptr to subraster corresponding to expression,
6434: * or NULL for any parsing error
6435: * (expression ptr unchanged if error occurs)
6436: * --------------------------------------------------------------------------
6437: * Notes: o
6438: * ======================================================================= */
6439: /* --- entry point --- */
6440: subraster *rastsqrt ( char **expression, int size, subraster *basesp,
6441: int arg1, int arg2, int arg3 )
6442: {
6443: /* -------------------------------------------------------------------------
6444: Allocations and Declarations
6445: -------------------------------------------------------------------------- */
6446: char *texsubexpr(), subexpr[8192], /* parse subexpr to be sqrt-ed */
6447: rootarg[8192]; /* optional \sqrt[rootarg]{...} */
6448: subraster *rasterize(), *subsp=NULL; /* rasterize subexpr */
6449: subraster *accent_subraster(), *sqrtsp=NULL, /* subraster with the sqrt */
6450: *new_subraster(), *rootsp=NULL; /* optionally preceded by [rootarg]*/
6451: int sqrtheight=0, sqrtwidth=0, surdwidth=0, /* height,width of sqrt */
6452: rootheight=0, rootwidth=0, /* height,width of rootarg raster */
6453: subheight=0, subwidth=0, pixsz=0; /* height,width,pixsz of subexpr */
6454: int rastput(); /* put subexpr in constructed sqrt */
6455: int overspace = 2; /*space between subexpr and overbar*/
6456: int delete_subraster(); /* free work areas */
6457: /* -------------------------------------------------------------------------
6458: Obtain subexpression to be sqrt-ed, and rasterize it
6459: -------------------------------------------------------------------------- */
6460: /* --- first check for optional \sqrt[rootarg]{...} --- */
6461: if ( *(*expression) == '[' ) /*check for []-enclosed optional arg*/
6462: { *expression = texsubexpr(*expression,rootarg,0,"[","]",0,0);
6463: if ( *rootarg != '\000' ) /* got rootarg */
6464: if ( (rootsp=rasterize(rootarg,size-1)) /*rasterize it at smaller size*/
6465: != NULL ) /* rasterized successfully */
6466: { rootheight = (rootsp->image)->height; /* get height of rootarg */
6467: rootwidth = (rootsp->image)->width; } /* and its width */
6468: } /* --- end-of-if(**expression=='[') --- */
6469: /* --- parse for subexpr to be sqrt-ed, and bump expression past it --- */
6470: *expression = texsubexpr(*expression,subexpr,0,"{","}",0,0);
6471: if ( *subexpr == '\000' ) /* couldn't get subexpression */
6472: goto end_of_job; /* nothing to do, so quit */
6473: /* --- rasterize subexpression to be accented --- */
6474: if ( (subsp = rasterize(subexpr,size)) /*rasterize subexpr at original size*/
6475: == NULL ) goto end_of_job; /* quit if failed */
6476: /* -------------------------------------------------------------------------
6477: determine height and width of sqrt raster to be constructed
6478: -------------------------------------------------------------------------- */
6479: /* --- first get height and width of subexpr --- */
6480: subheight = (subsp->image)->height; /* height of subexpr */
6481: subwidth = (subsp->image)->width; /* and its width */
6482: pixsz = (subsp->image)->pixsz; /* pixsz remains constant */
6483: /* --- determine height and width of sqrt to contain subexpr --- */
6484: sqrtheight = subheight + overspace; /* subexpr + blank line + overbar */
6485: surdwidth = SQRTWIDTH(sqrtheight); /* width of surd */
6486: sqrtwidth = subwidth + surdwidth + 1; /* total width */
6487: /* -------------------------------------------------------------------------
6488: construct sqrt (with room to move in subexpr) and embed subexpr in it
6489: -------------------------------------------------------------------------- */
6490: /* --- construct sqrt --- */
6491: if ( (sqrtsp=accent_subraster(SQRTACCENT,sqrtwidth,sqrtheight,pixsz))
6492: == NULL ) goto end_of_job; /* quit if failed to build sqrt */
6493: /* --- embed subexpr in sqrt at lower-right corner--- */
6494: rastput(sqrtsp->image,subsp->image,overspace,sqrtwidth-subwidth,1);
6495: sqrtsp->baseline = subsp->baseline + overspace; /* adjust baseline */
6496: /* --- "embed" rootarg at upper-left --- */
6497: if ( rootsp != NULL ) /*have optional \sqrt[rootarg]{...}*/
6498: {
6499: /* --- allocate full raster to contain sqrtsp and rootsp --- */
6500: int fullwidth = sqrtwidth +rootwidth - min2(rootwidth,max2(0,surdwidth-4)),
6501: fullheight= sqrtheight+rootheight- min2(rootheight,3+size);
6502: subraster *fullsp = new_subraster(fullwidth,fullheight,pixsz);
6503: if ( fullsp != NULL ) /* allocated successfully */
6504: { /* --- embed sqrtsp exactly at lower-right corner --- */
6505: rastput(fullsp->image,sqrtsp->image, /* exactly at lower-right corner*/
6506: fullheight-sqrtheight,fullwidth-sqrtwidth,1);
6507: /* --- embed rootsp near upper-left, nestled above leading surd --- */
6508: rastput(fullsp->image,rootsp->image,
6509: 0,max2(0,surdwidth-rootwidth-2-size),0);
6510: /* --- replace sqrtsp with fullsp --- */
6511: delete_subraster(sqrtsp); /* free original sqrtsp */
6512: sqrtsp = fullsp; /* and repoint it to fullsp instead*/
6513: sqrtsp->baseline = fullheight - (subheight - subsp->baseline); }
6514: } /* --- end-of-if(rootsp!=NULL) --- */
6515: /* --- initialize subraster parameters --- */
6516: sqrtsp->size = size; /* propagate font size forward */
6517: /* -------------------------------------------------------------------------
6518: free unneeded component subrasters and return final result to caller
6519: -------------------------------------------------------------------------- */
6520: end_of_job:
6521: if ( subsp != NULL ) delete_subraster(subsp); /* free unneeded subexpr */
6522: return ( sqrtsp );
6523: } /* --- end-of-function rastsqrt() --- */
6524:
6525:
6526: /* ==========================================================================
6527: * Function: rastaccent (expression,size,basesp,accent,isabove,isscript)
6528: * Purpose: \hat, \vec, \etc handler, returns a subraster corresponding
6529: * to expression (immediately following \accent) at font size
6530: * --------------------------------------------------------------------------
6531: * Arguments: expression (I/O) char ** to first char of null-terminated
6532: * string immediately following \accent to be
6533: * rasterized, and returning ptr immediately
6534: * following last character processed.
6535: * size (I) int containing 0-4 default font size
6536: * basesp (I) subraster * to character (or subexpression)
6537: * immediately preceding \accent
6538: * (unused, but passed for consistency)
6539: * accent (I) int containing HATACCENT or VECACCENT, etc,
6540: * between numerator and denominator,
6541: * or false not to draw it (for \over).
6542: * isabove (I) int containing true if accent is above
6543: * expression to be accented, or false
6544: * if accent is below (e.g., underbrace)
6545: * isscript (I) int containing true if sub/superscripts
6546: * allowed (for under/overbrace), or 0 if not.
6547: * --------------------------------------------------------------------------
6548: * Returns: ( subraster * ) ptr to subraster corresponding to expression,
6549: * or NULL for any parsing error
6550: * (expression ptr unchanged if error occurs)
6551: * --------------------------------------------------------------------------
6552: * Notes: o Also handles \overbrace{}^{} and \underbrace{}_{} by way
6553: * of isabove and isscript args.
6554: * ======================================================================= */
6555: /* --- entry point --- */
6556: subraster *rastaccent ( char **expression, int size, subraster *basesp,
6557: int accent, int isabove, int isscript )
6558: {
6559: /* -------------------------------------------------------------------------
6560: Allocations and Declarations
6561: -------------------------------------------------------------------------- */
6562: char *texsubexpr(), subexpr[8192]; /* parse subexpr to be accented */
6563: char *texscripts(), *script=NULL, /* \under,overbrace allow scripts */
6564: subscript[512], supscript[512]; /* scripts parsed from expression */
6565: subraster *rasterize(), *subsp=NULL, *scrsp=NULL; /*rasterize subexpr,script*/
6566: subraster *rastack(), *accsubsp=NULL; /* stack accent, subexpr, script */
6567: subraster *accent_subraster(), *accsp=NULL; /*raster for the accent itself*/
6568: int accheight=0, accwidth=0, /* height, width of accent */
6569: subheight=0, subwidth=0, pixsz=0; /* height,width,pixsz of subexpr */
6570: int delete_subraster(); /*free work areas in case of error*/
6571: int vspace = 0; /*vertical space between accent,sub*/
6572: /* -------------------------------------------------------------------------
6573: Obtain subexpression to be accented, and rasterize it
6574: -------------------------------------------------------------------------- */
6575: /* --- parse for subexpr to be accented, and bump expression past it --- */
6576: *expression = texsubexpr(*expression,subexpr,0,"{","}",0,0);
6577: if ( *subexpr=='\000' ) /* couldn't get subexpression */
6578: goto end_of_job; /* nothing to do, so quit */
6579: /* --- rasterize subexpression to be accented --- */
6580: if ( (subsp = rasterize(subexpr,size)) /*rasterize subexpr at original size*/
6581: == NULL ) goto end_of_job; /* quit if failed */
6582: /* -------------------------------------------------------------------------
6583: determine desired accent width and height
6584: -------------------------------------------------------------------------- */
6585: /* --- first get height and width of subexpr --- */
6586: subheight = (subsp->image)->height; /* height of subexpr */
6587: subwidth = (subsp->image)->width; /* and its width is overall width */
6588: pixsz = (subsp->image)->pixsz; /* original pixsz remains constant */
6589: /* --- determine desired width, height of accent --- */
6590: accwidth = subwidth; /* same width as subexpr */
6591: accheight = 3; /* default for bars */
6592: switch ( accent )
6593: { default: break; /* default okay */
6594: case DOTACCENT: case DDOTACCENT:
6595: accheight = (size<3? 3:4); /* default for dots */
6596: break;
6597: case HATACCENT: case VECACCENT:
6598: accheight = 7; /* default */
6599: if ( subwidth < 10 ) accheight = 5; /* unless small width */
6600: else if ( subwidth > 25 ) accheight = 9; /* or large */
6601: break;
6602: } /* --- end-of-switch(accent) --- */
6603: accheight = min2(accheight,subheight); /*never higher than accented subexpr*/
6604: /* -------------------------------------------------------------------------
6605: construct accent, and construct subraster with accent over (or under) subexpr
6606: -------------------------------------------------------------------------- */
6607: /* --- first construct accent --- */
6608: if ( (accsp = accent_subraster(accent,accwidth,accheight,pixsz)) /* accent */
6609: == NULL ) goto end_of_job; /* quit if failed to build accent */
6610: /* --- now stack accent above (or below) subexpr, and free both args --- */
6611: accsubsp = (isabove? rastack(subsp,accsp,1,vspace,1,3)/*accent above subexpr*/
6612: : rastack(accsp,subsp,2,vspace,1,3)); /*accent below subexpr*/
6613: if ( accsubsp == NULL ) /* failed to stack accent */
6614: { delete_subraster(subsp); /* free unneeded subsp */
6615: delete_subraster(accsp); /* and unneeded accsp */
6616: goto end_of_job; } /* and quit */
6617: /* -------------------------------------------------------------------------
6618: look for super/subscript (annotation for over/underbrace)
6619: -------------------------------------------------------------------------- */
6620: /* --- first check whether accent permits accompanying annotations --- */
6621: if ( !isscript ) goto end_of_job; /* no annotations for this accent */
6622: /* --- now get scripts if there actually are any --- */
6623: *expression = texscripts(*expression,subscript,supscript,(isabove?2:1));
6624: script = (isabove? supscript : subscript); /*select above^ or below_ script*/
6625: if ( *script == '\000' ) goto end_of_job; /* no accompanying script */
6626: /* --- rasterize script annotation at size-2 --- */
6627: if ( (scrsp = rasterize(script,size-2)) /* rasterize script at size-2 */
6628: == NULL ) goto end_of_job; /* quit if failed */
6629: /* --- stack annotation above (or below) accent, and free both args --- */
6630: accsubsp = (isabove? rastack(accsubsp,scrsp,1,0,1,3) /* accent above base */
6631: : rastack(scrsp,accsubsp,2,0,1,3)); /* accent below base */
6632: /* -------------------------------------------------------------------------
6633: return final result to caller
6634: -------------------------------------------------------------------------- */
6635: end_of_job:
6636: if ( accsubsp != NULL ) /* initialize subraster parameters */
6637: accsubsp->size = size; /* propagate font size forward */
6638: return ( accsubsp );
6639: } /* --- end-of-function rastaccent() --- */
6640:
6641:
6642: /* ==========================================================================
6643: * Function: rastfont (expression,size,basesp,font,arg2,arg3)
6644: * Purpose: \cal{}, \scr{}, \etc handler, returns subraster corresponding
6645: * to char(s) within {}'s rendered at size
6646: * --------------------------------------------------------------------------
6647: * Arguments: expression (I/O) char ** to first char of null-terminated
6648: * string immediately following \font to be
6649: * rasterized, and returning ptr immediately
6650: * following last character processed.
6651: * size (I) int containing 0-5 default font size
6652: * basesp (I) subraster * to character (or subexpression)
6653: * immediately preceding \accent
6654: * (unused, but passed for consistency)
6655: * font (I) int containing 1 for \cal{}, 2 for \scr{}
6656: * arg2 (I) int unused
6657: * arg3 (I) int unused
6658: * --------------------------------------------------------------------------
6659: * Returns: ( subraster * ) ptr to subraster corresponding to chars
6660: * between {}'s, or NULL for any parsing error
6661: * --------------------------------------------------------------------------
6662: * Notes: o
6663: * ======================================================================= */
6664: /* --- entry point --- */
6665: subraster *rastfont ( char **expression, int size, subraster *basesp,
6666: int font, int arg2, int arg3 )
6667: {
6668: /* -------------------------------------------------------------------------
6669: Allocations and Declarations
6670: -------------------------------------------------------------------------- */
6671: char *texsubexpr(), fontchars[8192], /*parse chars to be rendered in font*/
6672: subexpr[8192]; /* turn \cal{AB} into \calA\calB */
6673: char *pfchars=fontchars, fchar='\0'; /* run thru fontchars one at a time*/
6674: char *name = NULL; /* fonts[font].name */
6675: int class = 0, /* fonts[font].class */
6676: istext = 0; /* set true for text type */
6677: subraster *rasterize(), *fontsp=NULL, /* rasterize chars in font */
6678: *rastflags(); /* or just set flag to switch font */
6679: int oldsquashmargin = squashmargin; /* turn off squash in text mode */
6680: int blanksignal = (-991234); /*rastsquash signal right-hand blank*/
6681: /* --- fonts recognized by rastfont --- */
6682: static int nfonts = 5; /* legal font #'s are 1...nfonts */
6683: static struct {char *name; int class;}
6684: fonts[] =
6685: { /* --- name class 1=upper,2=alpha,3=alnum,4=lower,5=digit,9=all --- */
6686: { "\\badfont", 0 },
6687: { "\\cal", 1 }, /*(1) calligraphic, uppercase */
6688: { "\\scr", 1 }, /*(2) rsfs/script, uppercase */
6689: { "\\rm", -1 }, /*(3) \rm,\text{abc} --> {\rm~abc} */
6690: { "\\it", -1 }, /*(4) \it,\textit{abc}-->{\it~abc} */
6691: { "\\bb", -1 }, /*(5) \bb,\mathbb{abc}-->{\bb~abc} */
6692: { NULL, 0 }
6693: } ; /* --- end-of-fonts[] --- */
6694: /* -------------------------------------------------------------------------
6695: first get font name and class to determine type of conversion desired
6696: -------------------------------------------------------------------------- */
6697: if ( font<=0 || font>nfonts ) font=0; /* set error if out-of-bounds */
6698: name = fonts[font].name; /* font name */
6699: class = fonts[font].class; /* font class */
6700: if ( font==3 || font==4 ) /* text (respect blanks) */
6701: { istext = 1; /* signal text mode */
6702: squashmargin = 0; } /* don't squash internal blanks */
6703: /* -------------------------------------------------------------------------
6704: now convert \font{abc} --> {\font~abc}, or convert ABC to \calA\calB\calC
6705: -------------------------------------------------------------------------- */
6706: if ( class < 0 ) /* not character-by-character */
6707: {
6708: /* ---
6709: if \font not immediately followed by { then it has no arg, so just set flag
6710: ------------------------------------------------------------------------ */
6711: if ( *(*expression) != '{' ) /* no \font arg, so just set flag */
6712: {
6713: if ( msgfp!=NULL && msglevel>=99 )
6714: fprintf(msgfp,"rastfont> \\%s rastflags() for font#%d\n",name,font);
6715: switch ( font ) /* set flag by our internal font# */
6716: { case 3: /* \rm, \text sets flag istext=1 */
6717: fontsp = rastflags(expression,size,basesp,ISTEXT,1,arg3); break;
6718: case 4: /* \it, \text sets flag istext=2 */
6719: fontsp = rastflags(expression,size,basesp,ISTEXT,2,arg3); break;
6720: case 5: /* \bb, \mathbb sets flag istext=3 */
6721: fontsp = rastflags(expression,size,basesp,ISTEXT,3,arg3); break;
6722: default: break; } /* unrecognized, set no flags */
6723: goto end_of_job;
6724: } /* --- end-of-if(*(*expression)!='{') --- */
6725: /* ---
6726: convert \font{abc} --> {\font~abc}
6727: ---------------------------------- */
6728: /* --- parse for {fontchars} arg, and bump expression past it --- */
6729: *expression = texsubexpr(*expression,fontchars,0,"{","}",0,0);
6730: if ( msgfp!=NULL && msglevel>=99 )
6731: fprintf(msgfp,"rastfont> \\%s fontchars=\"%s\"\n",name,fontchars);
6732: /* --- convert all fontchars at the same time --- */
6733: strcpy(subexpr,"{"); /* start off with opening { */
6734: strcat(subexpr,name); /* followed by font name */
6735: strcat(subexpr,"~"); /* followed by whitespace */
6736: strcat(subexpr,fontchars); /* followed by all the chars */
6737: strcat(subexpr,"}"); /* terminate with closing } */
6738: } /* --- end-of-if(class<0) --- */
6739: else /* character-by-character */
6740: {
6741: /* ---
6742: convert ABC to \calA\calB\calC
6743: ------------------------------ */
6744: int isprevchar=0; /* true if prev char converted */
6745: /* --- parse for {fontchars} arg, and bump expression past it --- */
6746: *expression = texsubexpr(*expression,fontchars,0,"{","}",0,0);
6747: if ( msgfp!=NULL && msglevel>=99 )
6748: fprintf(msgfp,"rastfont> \\%s fontchars=\"%s\"\n",name,fontchars);
6749: /* --- convert fontchars one at a time --- */
6750: strcpy(subexpr,"{\\rm~"); /* start off with opening {\rm */
6751: strcpy(subexpr,"{"); /* nope, just start off with { */
6752: for ( pfchars=fontchars; (fchar= *pfchars)!='\000'; pfchars++ )
6753: {
6754: if ( isthischar(fchar,WHITEMATH) ) /* some whitespace */
6755: { if ( 0 || istext ) /* and we're in a text mode */
6756: strcat(subexpr,"\\;"); } /* so respect whitespace */
6757: else /* char to be displayed in font */
6758: { int exprlen = 0; /* #chars in subexpr before fchar */
6759: int isinclass = 0; /* set true if fchar in font class */
6760: switch ( class ) /* check if fchar is in font class */
6761: { default: break; /* no chars in unrecognized class */
6762: case 1: if ( isupper((int)fchar) ) isinclass=1; break;
6763: case 2: if ( isalpha((int)fchar) ) isinclass=1; break;
6764: case 3: if ( isalnum((int)fchar) ) isinclass=1; break;
6765: case 4: if ( islower((int)fchar) ) isinclass=1; break;
6766: case 5: if ( isdigit((int)fchar) ) isinclass=1; break;
6767: case 9: isinclass=1; break; }
6768: if ( isinclass ) /* convert current char to \font */
6769: { strcat(subexpr,name); /* by prefixing it with font name */
6770: isprevchar = 1; } /* and set flag to signal separator*/
6771: else /* current char not in \font */
6772: { if ( isprevchar ) /* extra separator only after \font*/
6773: if ( isalpha(fchar) ) /* separator only before alpha */
6774: strcat(subexpr,"~"); /* need separator after \font */
6775: isprevchar = 0; } /* reset flag for next char */
6776: exprlen = strlen(subexpr); /* #chars so far */
6777: subexpr[exprlen] = fchar; /*fchar immediately after \fontname*/
6778: subexpr[exprlen+1] = '\000'; } /* replace terminating '\0' */
6779: } /* --- end-of-for(pfchars) --- */
6780: strcat(subexpr,"}"); /* add closing } */
6781: } /* --- end-of-if/else(class<0) --- */
6782: /* -------------------------------------------------------------------------
6783: rasterize subexpression containing chars to be rendered at font
6784: -------------------------------------------------------------------------- */
6785: if ( msgfp!=NULL && msglevel>=99 )
6786: fprintf(msgfp,"rastfont> subexpr=\"%s\"\n",subexpr);
6787: if ( (fontsp = rasterize(subexpr,size)) /* rasterize chars in font */
6788: == NULL ) goto end_of_job; /* and quit if failed */
6789: /* -------------------------------------------------------------------------
6790: back to caller with chars rendered in font
6791: -------------------------------------------------------------------------- */
6792: end_of_job:
6793: squashmargin = oldsquashmargin; /* restore squash */
6794: if ( istext && fontsp!=NULL ) /* raster contains text */
6795: fontsp->type = blanksignal; /* signal nosquash */
6796: return ( fontsp ); /* chars rendered in font */
6797: } /* --- end-of-function rastfont() --- */
6798:
6799:
6800: /* ==========================================================================
6801: * Function: rastbegin ( expression, size, basesp, arg1, arg2, arg3 )
6802: * Purpose: \begin{}...\end{} handler, returns a subraster corresponding
6803: * to array expression within environment, i.e., rewrites
6804: * \begin{}...\end{} as mimeTeX equivalent, and rasterizes that.
6805: * --------------------------------------------------------------------------
6806: * Arguments: expression (I/O) char ** to first char of null-terminated
6807: * string immediately following \begin to be
6808: * rasterized, and returning ptr immediately
6809: * following last character processed.
6810: * size (I) int containing 0-4 default font size
6811: * basesp (I) subraster * to character (or subexpression)
6812: * immediately preceding \begin
6813: * (unused, but passed for consistency)
6814: * arg1 (I) int unused
6815: * arg2 (I) int unused
6816: * arg3 (I) int unused
6817: * --------------------------------------------------------------------------
6818: * Returns: ( subraster * ) ptr to subraster corresponding to array
6819: * expression, or NULL for any parsing error
6820: * --------------------------------------------------------------------------
6821: * Notes: o
6822: * ======================================================================= */
6823: /* --- entry point --- */
6824: subraster *rastbegin ( char **expression, int size, subraster *basesp,
6825: int arg1, int arg2, int arg3 )
6826: {
6827: /* -------------------------------------------------------------------------
6828: Allocations and Declarations
6829: -------------------------------------------------------------------------- */
6830: char *texsubexpr(), subexpr[8210], /* \begin{} environment paramaters */
6831: *exprptr=NULL,*begptr=NULL,*endptr=NULL,*braceptr=NULL; /* ptrs */
6832: char *begtoken="\\begin{", *endtoken="\\end{"; /*tokens we're looking for*/
6833: int strreplace(); /* replace substring in string */
6834: char *strchange(); /*\begin...\end --> {\begin...\end}*/
6835: char *delims = (char *)NULL; /* mdelims[ienviron] */
6836: subraster *rasterize(), *sp=NULL; /* rasterize environment */
6837: int ienviron = 0; /* environs[] index */
6838: int nbegins = 0; /* #\begins nested beneath this one*/
6839: int envlen=0, sublen=0; /* #chars in environ, subexpr */
6840: static int blevel = 0; /* \begin...\end nesting level */
6841: static char *mdelims[] = { NULL, NULL, NULL, NULL,
6842: "()","[]","{}","||","==", /* for pbBvVmatrix */
6843: NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
6844: NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
6845: static char *environs[] = { /* types of environments we process*/
6846: "eqnarray", /* 0 eqnarray environment */
6847: "array", /* 1 array environment */
6848: "matrix", /* 2 array environment */
6849: "tabular", /* 3 array environment */
6850: "pmatrix", /* 4 ( ) */
6851: "bmatrix", /* 5 [ ] */
6852: "Bmatrix", /* 6 { } */
6853: "vmatrix", /* 7 | | */
6854: "Vmatrix", /* 8 || || */
6855: "gather", /* 9 gather environment */
6856: "align", /* 10 align environment */
6857: "verbatim", /* 11 verbatim environment */
6858: "picture", /* 12 picture environment */
6859: NULL }; /* trailer */
6860: /* -------------------------------------------------------------------------
6861: determine type of environment we're beginning
6862: -------------------------------------------------------------------------- */
6863: /* --- first bump nesting level --- */
6864: blevel++; /* count \begin...\begin...'s */
6865: /* --- \begin must be followed by {type_of_environment} --- */
6866: exprptr = texsubexpr(*expression,subexpr,0,"{","}",0,0);
6867: if ( *subexpr == '\000' ) goto end_of_job; /* no environment given */
6868: while ( (delims=strchr(subexpr,'*')) != NULL ) /* have environment* */
6869: strcpy(delims,delims+1); /* treat it as environment */
6870: /* --- look up environment in our table --- */
6871: for ( ienviron=0; ;ienviron++ ) /* search table till NULL */
6872: if ( environs[ienviron] == NULL ) /* found NULL before match */
6873: goto end_of_job; /* so quit */
6874: else /* see if we have an exact match */
6875: if ( memcmp(environs[ienviron],subexpr,strlen(subexpr)) == 0 ) /*match*/
6876: break; /* leave loop with ienviron index */
6877: /* --- accumulate any additional params for this environment --- */
6878: *subexpr = '\000'; /* reset subexpr to empty string */
6879: delims = mdelims[ienviron]; /* mdelims[] string for ienviron */
6880: if ( delims != NULL ) /* add appropriate opening delim */
6881: { strcpy(subexpr,"\\"); /* start with \ for (,[,{,|,= */
6882: strcat(subexpr,delims); /* then add opening delim */
6883: subexpr[2] = '\000'; } /* remove extraneous closing delim */
6884: switch ( ienviron )
6885: {
6886: default: goto end_of_job; /* environ not implemented yet */
6887: case 0: /* \begin{eqnarray} */
6888: strcpy(subexpr,"\\array{rcl$"); /* set default rcl for eqnarray */
6889: break;
6890: case 1: case 2: case 3: /* \begin{array} followed by {lcr} */
6891: strcpy(subexpr,"\\array{"); /*start with mimeTeX \array{ command*/
6892: skipwhite(exprptr); /* bump to next non-white char */
6893: if ( *exprptr == '{' ) /* assume we have {lcr} argument */
6894: { exprptr = texsubexpr(exprptr,subexpr+7,0,"{","}",0,0); /*add on lcr*/
6895: if ( *(subexpr+7) == '\000' ) goto end_of_job; /* quit if no lcr */
6896: strcat(subexpr,"$"); } /* add terminating $ to lcr */
6897: break;
6898: case 4: case 5: case 6: /* \begin{pmatrix} or b,B,v,Vmatrix */
6899: case 7: case 8:
6900: strcat(subexpr,"\\array{"); /*start with mimeTeX \array{ command*/
6901: break;
6902: case 9: /* gather */
6903: strcat(subexpr,"\\array{c$"); /* center equations */
6904: break;
6905: case 10: /* align */
6906: strcat(subexpr,"\\array{rclrclrclrclrclrcl$"); /* a&=b & c&=d & etc */
6907: break;
6908: case 11: /* verbatim */
6909: strcat(subexpr,"{\\rm "); /* {\rm ...} */
6910: /*strcat(subexpr,"\\\\{\\rm ");*/ /* \\{\rm } doesn't work in context */
6911: break;
6912: case 12: /* picture */
6913: strcat(subexpr,"\\picture"); /* picture environment */
6914: skipwhite(exprptr); /* bump to next non-white char */
6915: if ( *exprptr == '(' ) /*assume we have (width,height) arg*/
6916: { exprptr = texsubexpr(exprptr,subexpr+8,0,"(",")",0,1); /*add on arg*/
6917: if ( *(subexpr+8) == '\000' ) goto end_of_job; } /* quit if no arg */
6918: strcat(subexpr,"{"); /* opening { after (width,height) */
6919: break;
6920: } /* --- end-of-switch(ienviron) --- */
6921: /* -------------------------------------------------------------------------
6922: locate matching \end{...}
6923: -------------------------------------------------------------------------- */
6924: /* --- first \end following \begin --- */
6925: if ( (endptr=strstr(exprptr,endtoken)) /* find 1st \end following \begin */
6926: == NULL ) goto end_of_job; /* and quit if no \end found */
6927: /* --- find matching endptr by pushing past any nested \begin's --- */
6928: begptr = exprptr; /* start after first \begin{...} */
6929: while ( 1 ) /*break when we find matching \end*/
6930: {
6931: /* --- first, set ptr to closing } terminating current \end{...} --- */
6932: if ( (braceptr=strchr(endptr+1,'}')) /* find 1st } following \end{ */
6933: == NULL ) goto end_of_job; /* and quit if no } found */
6934: /* -- locate next nested \begin --- */
6935: if ( (begptr=strstr(begptr,begtoken)) /* find next \begin{...} */
6936: == NULL ) break; /*no more, so we have matching \end*/
6937: begptr += strlen(begtoken); /* push ptr past token */
6938: if ( begptr >= endptr ) break; /* past endptr, so not nested */
6939: /* --- have nested \begin, so push forward to next \end --- */
6940: nbegins++; /* count another nested \begin */
6941: if ( (endptr=strstr(endptr+strlen(endtoken),endtoken)) /* find next \end */
6942: == NULL ) goto end_of_job; /* and quit if none found */
6943: } /* --- end-of-while(1) --- */
6944: /* --- push expression past closing } of \end{} --- */
6945: *expression = braceptr+1; /* resume processing after } */
6946: /* -------------------------------------------------------------------------
6947: add on everything (i.e., the ...'s) between \begin{}[{}] ... \end{}
6948: -------------------------------------------------------------------------- */
6949: /* --- add on everything, completing subexpr for \begin{}...\end{} --- */
6950: sublen = strlen(subexpr); /* #chars in "preamble" */
6951: envlen = (int)(endptr-exprptr); /* #chars between \begin{}{}...\end */
6952: memcpy(subexpr+sublen,exprptr,envlen); /*concatanate environ after subexpr*/
6953: subexpr[sublen+envlen] = '\000'; /* and null-terminate */
6954: if ( 2 > 1 ) /* always... */
6955: strcat(subexpr,"}"); /* ...followed by terminating } */
6956: /* --- add terminating \right), etc, if necessary --- */
6957: if ( delims != (char *)NULL ) /* need closing delim */
6958: { strcat(subexpr,"\\"); /* start with \ for ),],},|,= */
6959: strcat(subexpr,delims+1); } /* add appropriate closing delim */
6960: /* -------------------------------------------------------------------------
6961: change nested \begin...\end to {\begin...\end} so \array{} can handle them
6962: -------------------------------------------------------------------------- */
6963: if ( nbegins > 0 ) /* have nested begins */
6964: if ( blevel < 2 ) /* only need to do this once */
6965: {
6966: begptr = subexpr; /* start at beginning of subexpr */
6967: while( (begptr=strstr(begptr,begtoken)) != NULL ) /* have \begin{...} */
6968: { strchange(0,begptr,"{"); /* \begin --> {\begin */
6969: begptr += strlen(begtoken); } /* continue past {\begin */
6970: endptr = subexpr; /* start at beginning of subexpr */
6971: while( (endptr=strstr(endptr,endtoken)) != NULL ) /* have \end{...} */
6972: if ( (braceptr=strchr(endptr+1,'}')) /* find 1st } following \end{ */
6973: == NULL ) goto end_of_job; /* and quit if no } found */
6974: else /* found terminating } */
6975: { strchange(0,braceptr,"}"); /* \end{...} --> \end{...}} */
6976: endptr = braceptr+1; } /* continue past \end{...} */
6977: } /* --- end-of-if(nbegins>0) --- */
6978: /* -------------------------------------------------------------------------
6979: post process as necessary
6980: -------------------------------------------------------------------------- */
6981: switch ( ienviron )
6982: {
6983: default: break; /* no post-processing required */
6984: case 10: /* align */
6985: strreplace(subexpr,"&=","#*@*#=",0); /* tag all &='s */
6986: strreplace(subexpr,"&<","#*@*#<",0); /* tag all &<'s */
6987: strreplace(subexpr,"&\\lt","#*@*#<",0); /* tag all &\lt's */
6988: strreplace(subexpr,"&\\leq","#*@*#\\leq",0); /* tag all &\leq's */
6989: strreplace(subexpr,"&>","#*@*#>",0); /* tag all &>'s */
6990: strreplace(subexpr,"&\\gt","#*@*#>",0); /* tag all &\gt's */
6991: strreplace(subexpr,"&\\geq","#*@*#\\geq",0); /* tag all &\geq's */
6992: if ( nbegins < 1 ) /* don't modify nested arrays */
6993: strreplace(subexpr,"&","\\hspace{10}&\\hspace{10}",0); /* add space */
6994: strreplace(subexpr,"#*@*#=","& = &",0); /*restore and xlate tagged &='s*/
6995: strreplace(subexpr,"#*@*#<","& \\lt &",0); /*restore, xlate tagged &<'s*/
6996: strreplace(subexpr,"#*@*#\\leq","& \\leq &",0); /*xlate tagged &\leq's*/
6997: strreplace(subexpr,"#*@*#>","& \\gt &",0); /*restore, xlate tagged &>'s*/
6998: strreplace(subexpr,"#*@*#\\geq","& \\geq &",0); /*xlate tagged &\geq's*/
6999: break;
7000: case 11: /* verbatim */
7001: strreplace(subexpr,"\n","\\\\",0); /* xlate \n newline to latex \\ */
7002: /*strcat(subexpr,"\\\\");*/ /* add final latex \\ newline */
7003: break;
7004: case 12: /* picture */
7005: strreplace(subexpr,"\\put "," ",0); /*remove \put's (not really needed)*/
7006: strreplace(subexpr,"\\put(","(",0); /*remove \put's (not really needed)*/
7007: strreplace(subexpr,"\\oval","\\circle",0); /* actually an ellipse */
7008: break;
7009: } /* --- end-of-switch(ienviron) --- */
7010: /* -------------------------------------------------------------------------
7011: return rasterized mimeTeX equivalent of \begin{}...\end{} environment
7012: -------------------------------------------------------------------------- */
7013: /* --- debugging output --- */
7014: if ( msgfp!=NULL && msglevel>=99 )
7015: fprintf(msgfp,"rastbegin> subexpr=%s\n",subexpr);
7016: /* --- rasterize mimeTeX equivalent of \begin{}...\end{} environment --- */
7017: sp = rasterize(subexpr,size); /* rasterize subexpr */
7018: end_of_job:
7019: blevel--; /* decrement \begin nesting level */
7020: return ( sp ); /* back to caller with sp or NULL */
7021: } /* --- end-of-function rastbegin() --- */
7022:
7023:
7024: /* ==========================================================================
7025: * Function: rastarray ( expression, size, basesp, arg1, arg2, arg3 )
7026: * Purpose: \array handler, returns a subraster corresponding to array
7027: * expression (immediately following \array) at font size
7028: * --------------------------------------------------------------------------
7029: * Arguments: expression (I/O) char ** to first char of null-terminated
7030: * string immediately following \array to be
7031: * rasterized, and returning ptr immediately
7032: * following last character processed.
7033: * size (I) int containing 0-4 default font size
7034: * basesp (I) subraster * to character (or subexpression)
7035: * immediately preceding \array
7036: * (unused, but passed for consistency)
7037: * arg1 (I) int unused
7038: * arg2 (I) int unused
7039: * arg3 (I) int unused
7040: * --------------------------------------------------------------------------
7041: * Returns: ( subraster * ) ptr to subraster corresponding to array
7042: * expression, or NULL for any parsing error
7043: * --------------------------------------------------------------------------
7044: * Notes: o Summary of syntax...
7045: * \array{3,lcrBC$a&b&c\\d&e&f\\etc}
7046: * o The 3,lcrBC$ part is an optional "preamble". The lcr means
7047: * what you think, i.e., "horizontal" left,center,right
7048: * justification down corresponding column. The new BC means
7049: * "vertical" baseline,center justification across corresponding
7050: * row. The leading 3 specifies the font size 0-4 to be used.
7051: * You may also specify +1,-1,+2,-2, etc, which is used as an
7052: * increment to the current font size, e.g., -1,lcr$ uses
7053: * one font size smaller than current. Without a leading
7054: * + or -, the font size is "absolute".
7055: * o The preamble can also be just lcrBC$ without a leading
7056: * size-part, or just 3$ without a trailing lcrBC-part.
7057: * The default size is whatever is current, and the
7058: * default justification is c(entered) and B(aseline).
7059: * ======================================================================= */
7060: /* --- entry point --- */
7061: subraster *rastarray ( char **expression, int size, subraster *basesp,
7062: int arg1, int arg2, int arg3 )
7063: {
7064: /* -------------------------------------------------------------------------
7065: Allocations and Declarations
7066: -------------------------------------------------------------------------- */
7067: char *texsubexpr(), subexpr[8210], *exprptr, /* parse array subexpr */
7068: subtok[4096], *subptr=subtok, /* & or \\ inside { }'s not a delim*/
7069: token[4096], *tokptr=token, /* token from subexpr to rasterize */
7070: *preamble(), *preptr=token; /*process optional size,lcr preamble*/
7071: char *coldelim="&", *rowdelim="\\"; /* need escaped rowdelim */
7072: int maxarraysz = 64; /* max #rows, cols */
7073: int justify[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* -1,0,+1 = l,c,r */
7074: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7075: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7076: hline[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* hline above row? */
7077: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7078: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7079: vline[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*vline left of col?*/
7080: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7081: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7082: colwidth[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*widest tokn in col*/
7083: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7084: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7085: rowheight[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* "highest" in row */
7086: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7087: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7088: fixcolsize[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*1=fixed col width*/
7089: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7090: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7091: fixrowsize[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*1=fixed row height*/
7092: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7093: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7094: rowbaseln[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* baseline for row */
7095: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7096: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7097: rowcenter[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*true = vcenter row*/
7098: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7099: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
7100: static int /* --- propagate global values across arrays --- */
7101: gjustify[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* -1,0,+1 = l,c,r */
7102: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7103: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7104: gcolwidth[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*widest tokn in col*/
7105: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7106: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7107: growheight[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* "highest" in row */
7108: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7109: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7110: gfixcolsize[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*1=fixed col width*/
7111: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7112: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7113: gfixrowsize[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*1=fixed row height*/
7114: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7115: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
7116: growcenter[65]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*true = vcenter row*/
7117: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
7118: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
7119: int rowglobal=0, colglobal=0, /* true to set global values */
7120: rowpropagate=0, colpropagate=0; /* true if propagating values */
7121: int irow,nrows=0, icol,ncols[65], /*#rows in array, #cols in each row*/
7122: maxcols=0; /* max# cols in any single row */
7123: int itoken, ntokens=0, /* index, total #tokens in array */
7124: subtoklen=0, /* strlen of {...} subtoken */
7125: istokwhite=1, /* true if token all whitespace */
7126: nnonwhite=0; /* #non-white tokens */
7127: int isescape=0,wasescape=0, /* current,prev chars escape? */
7128: ischarescaped=0, /* is current char escaped? */
7129: nescapes=0; /* #consecutive escapes */
7130: subraster *rasterize(), *toksp[1025], /* rasterize tokens */
7131: *new_subraster(), *arraysp=NULL; /* subraster for entire array */
7132: raster *arrayrp=NULL; /* raster for entire array */
7133: int delete_subraster(); /* free toksp[] workspace at eoj */
7134: int rowspace=2, colspace=4, /* blank space between rows, cols */
7135: hspace=1, vspace=1; /*space to accommodate hline,vline*/
7136: int width=0, height=0, /* width,height of array */
7137: leftcol=0, toprow=0; /*upper-left corner for cell in it*/
7138: int rastput(); /* embed tokens/cells in array */
7139: int rule_raster(); /* draw hlines and vlines in array */
7140: char *hlchar="\\hline", *hdchar="\\hdash"; /* token signals hline */
7141: char *texchar(), hltoken[1025]; /* extract \hline from token */
7142: int ishonly=0, hltoklen, minhltoklen=3; /*flag, token must be \hl or \hd*/
7143: int isnewrow=1; /* true for new row */
7144: int pixsz = 1; /*default #bits per pixel, 1=bitmap*/
7145: /* -------------------------------------------------------------------------
7146: Macros to determine extra raster space required for vline/hline
7147: -------------------------------------------------------------------------- */
7148: #define vlinespace(icol) \
7149: ( vline[icol] == 0? 0 : /* no vline so no space needed */ \
7150: ( icol<1 || icol>=maxcols? vspace+(colspace+1)/2 : vspace ) )
7151: #define hlinespace(irow) \
7152: ( hline[irow] == 0? 0 : /* no hline so no space needed */ \
7153: ( irow<1 || irow>=nrows? hspace+(rowspace+1)/2 : hspace ) )
7154: /* -------------------------------------------------------------------------
7155: Obtain array subexpression
7156: -------------------------------------------------------------------------- */
7157: /* --- parse for array subexpression, and bump expression past it --- */
7158: subexpr[1] = *subexpr = ' '; /* set two leading blanks */
7159: *expression = texsubexpr(*expression,subexpr+2,0,"{","}",0,0);
7160: if ( msglevel>=29 && msgfp!=NULL ) /* debugging, display array */
7161: fprintf(msgfp,"rastarray> %.256s\n",subexpr+2);
7162: if ( *(subexpr+2)=='\000' ) /* couldn't get subexpression */
7163: goto end_of_job; /* nothing to do, so quit */
7164: /* -------------------------------------------------------------------------
7165: process optional size,lcr preamble if present
7166: -------------------------------------------------------------------------- */
7167: /* --- reset size, get lcr's, and push exprptr past preamble --- */
7168: exprptr = preamble(subexpr+2,&size,preptr); /* reset size and get lcr's */
7169: /* --- init with global values --- */
7170: for(icol=0; icol<=maxarraysz; icol++) { /* propagate global values... */
7171: justify[icol] = gjustify[icol]; /* -1,0,+1 = l,c,r */
7172: colwidth[icol] = gcolwidth[icol]; /* column width */
7173: rowheight[icol] = growheight[icol]; /* row height */
7174: fixcolsize[icol] = gfixcolsize[icol]; /* 1=fixed col width */
7175: fixrowsize[icol] = gfixrowsize[icol]; /* 1=fixed row height */
7176: rowcenter[icol] = growcenter[icol]; } /* true = vcenter row */
7177: /* --- process lcr's, etc in preamble --- */
7178: itoken = 0; /* debugging flag */
7179: if ( msglevel>=29 && msgfp!=NULL ) /* debugging, display preamble */
7180: if ( *preptr != '\000' ) /* if we have one */
7181: fprintf(msgfp,"rastarray> preamble= \"%.256s\"\nrastarray> preamble: ",
7182: preptr);
7183: irow = icol = 0; /* init lcr counts */
7184: while ( *preptr != '\000' ) /* check preamble text for lcr */
7185: {
7186: char prepchar = *preptr; /* current preamble character */
7187: int prepcase = (islower(prepchar)?1:(isupper(prepchar)?2:0)); /*1,2,or 0*/
7188: if ( irow<maxarraysz && icol<maxarraysz )
7189: switch ( /*tolower*/(prepchar) )
7190: { default: break; /* just flush unrecognized chars */
7191: case 'l': justify[icol] = (-1); /*left-justify this column*/
7192: if (colglobal) gjustify[irow] = justify[irow]; break;
7193: case 'c': justify[icol] = (0); /* center this column */
7194: if (colglobal) gjustify[irow] = justify[irow]; break;
7195: case 'r': justify[icol] = (+1); /* right-justify this col */
7196: if (colglobal) gjustify[irow] = justify[irow]; break;
7197: case '|': vline[icol] += 1; break; /* solid vline left of col */
7198: case '.': vline[icol] = (-1); break; /*dashed vline left of col */
7199: case 'b': prepchar='B'; prepcase=2; /* alias for B */
7200: case 'B': break; /* baseline-justify row */
7201: case 'v': prepchar='C'; prepcase=2; /* alias for C */
7202: case 'C': rowcenter[irow] = 1; /* vertically center row */
7203: if (rowglobal) growcenter[irow] = rowcenter[irow]; break;
7204: case 'g': colglobal=1; prepcase=0; break; /* set global col values */
7205: case 'G': rowglobal=1; prepcase=0; break; /* set global row values */
7206: case '#': colglobal=rowglobal=1; break; } /* set global col,row vals */
7207: if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
7208: fprintf(msgfp," %c[%d]",prepchar,
7209: (prepcase==1?icol+1:(prepcase==2?irow+1:0)));
7210: preptr++; /* check next char for lcr */
7211: itoken++; /* #lcr's processed (debugging only)*/
7212: /* --- check for number or +number specifying colwidth or rowheight --- */
7213: if ( prepcase != 0 ) /* only check upper,lowercase */
7214: {
7215: int ispropagate = (*preptr=='+'?1:0); /* leading + propagates width/ht */
7216: if ( ispropagate ) /* set row or col propagation */
7217: if ( prepcase == 1 ) colpropagate = 1; /* propagating col values */
7218: else if ( prepcase == 2 ) rowpropagate = 1; /* propagating row values */
7219: if ( !colpropagate && prepcase == 1 )
7220: { colwidth[icol] = 0; /* reset colwidth */
7221: fixcolsize[icol] = 0; } /* reset width flag */
7222: if ( !rowpropagate && prepcase == 2 )
7223: { rowheight[irow] = 0; /* reset row height */
7224: fixrowsize[irow] = 0; } /* reset height flag */
7225: if ( ispropagate ) preptr++; /* bump past leading + */
7226: if ( isdigit(*preptr) ) /* digit follows character */
7227: { char *endptr = NULL; /* preptr set to 1st char after num*/
7228: int size = (int)(strtol(preptr,&endptr,10)); /* interpret number */
7229: char *whchars="?wh"; /* debugging width/height labels */
7230: preptr = endptr; /* skip over all digits */
7231: if ( size==0 || (size>=3&&size<=500) ) { /* sanity check */
7232: int index; /* icol,irow...maxarraysz index */
7233: if ( prepcase == 1 ) /* lowercase signifies colwidth */
7234: for(index=icol; index<=maxarraysz; index++) { /*propagate col size*/
7235: colwidth[index] = size; /* set colwidth to fixed size */
7236: fixcolsize[index] = (size>0?1:0); /* set fixed width flag */
7237: justify[index] = justify[icol]; /* and propagate justification */
7238: if ( colglobal ) { /* set global values */
7239: gcolwidth[index] = colwidth[index]; /* set global col width */
7240: gfixcolsize[index] = fixcolsize[index]; /*set global width flag*/
7241: gjustify[index] = justify[icol]; } /* set global col justify */
7242: if ( !ispropagate ) break; } /* don't propagate */
7243: else /* uppercase signifies rowheight */
7244: for(index=irow; index<=maxarraysz; index++) { /*propagate row size*/
7245: rowheight[index] = size; /* set rowheight to size */
7246: fixrowsize[index] = (size>0?1:0); /* set fixed height flag */
7247: rowcenter[index] = rowcenter[irow]; /* and propagate row center */
7248: if ( rowglobal ) { /* set global values */
7249: growheight[index] = rowheight[index]; /* set global row height */
7250: gfixrowsize[index] = fixrowsize[index]; /*set global height flag*/
7251: growcenter[index] = rowcenter[irow]; } /*set global row center*/
7252: if ( !ispropagate ) break; } /* don't propagate */
7253: } /* --- end-of-if(size>=3&&size<=500) --- */
7254: if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
7255: fprintf(msgfp,":%c=%d/fix#%d",whchars[prepcase],
7256: (prepcase==1?colwidth[icol]:rowheight[irow]),
7257: (prepcase==1?fixcolsize[icol]:fixrowsize[irow]));
7258: } /* --- end-of-if(isdigit()) --- */
7259: } /* --- end-of-if(prepcase!=0) --- */
7260: if ( prepcase == 1 ) icol++; /* bump col if lowercase lcr */
7261: else if ( prepcase == 2 ) irow++; /* bump row if uppercase BC */
7262: } /* --- end-of-while(*preptr!='\000') --- */
7263: if ( msglevel>=29 && msgfp!=NULL ) /* debugging, emit final newline */
7264: if ( itoken > 0 ) /* if we have preamble */
7265: fprintf(msgfp,"\n");
7266: /* -------------------------------------------------------------------------
7267: tokenize and rasterize components a & b \\ c & d \\ etc of subexpr
7268: -------------------------------------------------------------------------- */
7269: /* --- rasterize tokens one at a time, and maintain row,col counts --- */
7270: ncols[nrows] = 0; /* no tokens/cols in top row yet */
7271: while ( 1 ) /* scan chars till end */
7272: {
7273: /* --- local control flags --- */
7274: int iseox = (*exprptr == '\000'), /* null signals end-of-expression */
7275: iseor = iseox, /* \\ or eox signals end-of-row */
7276: iseoc = iseor; /* & or eor signals end-of-col */
7277: /* --- check for escapes --- */
7278: isescape = isthischar(*exprptr,ESCAPE); /* is current char escape? */
7279: wasescape= (!isnewrow&&isthischar(*(exprptr-1),ESCAPE)); /*prev char esc?*/
7280: nescapes = (wasescape?nescapes+1:0); /* # preceding consecutive escapes */
7281: ischarescaped = (nescapes%2==0?0:1); /* is current char escaped? */
7282: /* -----------------------------------------------------------------------
7283: check for {...} subexpression starting from where we are now
7284: ------------------------------------------------------------------------ */
7285: if ( *exprptr == '{' /* start of {...} subexpression */
7286: && !ischarescaped ) /* if not escaped \{ */
7287: {
7288: subptr = texsubexpr(exprptr,subtok,4095,"{","}",1,1); /*entire subexpr*/
7289: subtoklen = strlen(subtok); /* #chars in {...} */
7290: memcpy(tokptr,exprptr,subtoklen); /* copy {...} to accumulated token */
7291: tokptr += subtoklen; /* bump tokptr to end of token */
7292: exprptr += subtoklen; /* and bump exprptr past {...} */
7293: istokwhite = 0; /* signal non-empty token */
7294: continue; /* continue with char after {...} */
7295: } /* --- end-of-if(*exprptr=='{') --- */
7296: /* -----------------------------------------------------------------------
7297: check for end-of-row(\\) and/or end-of-col(&)
7298: ------------------------------------------------------------------------ */
7299: /* --- check for (escaped) end-of-row delimiter --- */
7300: if ( isescape && !ischarescaped ) /* current char is escaped */
7301: if ( isthischar(*(exprptr+1),rowdelim) /* next char is rowdelim */
7302: || *(exprptr+1) == '\000' ) /* or a pathological null */
7303: { iseor = 1; /* so set end-of-row flag */
7304: wasescape=isescape=nescapes = 0; } /* reset flags for new row */
7305: /* --- check for end-of-col delimiter --- */
7306: if (iseor /* end-of-row signals end-of-col */
7307: || (!ischarescaped&&isthischar(*exprptr,coldelim))) /*or unescaped coldel*/
7308: iseoc = 1; /* so set end-of-col flag */
7309: /* -----------------------------------------------------------------------
7310: rasterize completed token
7311: ------------------------------------------------------------------------ */
7312: if ( iseoc ) /* we have a completed token */
7313: {
7314: *tokptr = '\000'; /* first, null-terminate token */
7315: /* --- check first token in row for \hline or \hdash --- */
7316: ishonly = 0; /*init for token not only an \hline*/
7317: if ( ncols[nrows] == 0 ) /*\hline must be first token in row*/
7318: {
7319: tokptr=token; skipwhite(tokptr); /* skip whitespace after // */
7320: tokptr = texchar(tokptr,hltoken); /* extract first char from token */
7321: hltoklen = strlen(hltoken); /* length of first char */
7322: if ( hltoklen >= minhltoklen ) /*token must be at least \hl or \hd*/
7323: if ( memcmp(hlchar,hltoken,hltoklen) == 0 ) /* we have an \hline */
7324: hline[nrows] += 1; /* bump \hline count for row */
7325: else if ( memcmp(hdchar,hltoken,hltoklen) == 0 ) /*we have an \hdash*/
7326: hline[nrows] = (-1); /* set \hdash flag for row */
7327: if ( hline[nrows] != 0 ) /* \hline or \hdash prefixes token */
7328: { skipwhite(tokptr); /* flush whitespace after \hline */
7329: if ( *tokptr == '\000' /* end-of-expression after \hline */
7330: || isthischar(*tokptr,coldelim) ) /* or unescaped coldelim */
7331: istokwhite = ishonly = 1; /* so token contains \hline only */
7332: else /* token contains more than \hline */
7333: strcpy(token,tokptr); } /* so flush \hline from token */
7334: } /* --- end-of-if(ncols[nrows]==0) --- */
7335: /* --- rasterize completed token --- */
7336: toksp[ntokens] = (istokwhite? NULL : /* don't rasterize empty token */
7337: rasterize(token,size)); /* rasterize non-empty token */
7338: if ( toksp[ntokens] != NULL ) /* have a rasterized token */
7339: nnonwhite++; /* bump rasterized token count */
7340: /* --- maintain colwidth[], rowheight[] max, and rowbaseln[] --- */
7341: if ( toksp[ntokens] != NULL ) /* we have a rasterized token */
7342: {
7343: /* --- update max token "height" in current row, and baseline --- */
7344: int twidth = ((toksp[ntokens])->image)->width, /* width of token */
7345: theight = ((toksp[ntokens])->image)->height, /* height of token */
7346: tbaseln = (toksp[ntokens])->baseline, /* baseline of token */
7347: rheight = rowheight[nrows], /* current max height for row */
7348: rbaseln = rowbaseln[nrows]; /* current baseline for max height */
7349: if ( 0 || fixrowsize[nrows]==0 ) /* rowheight not fixed */
7350: rowheight[nrows] = /*max2( rheight,*/( /* current (max) rowheight */
7351: max2(rbaseln+1,tbaseln+1) /* max height above baseline */
7352: + max2(rheight-rbaseln-1,theight-tbaseln-1) ); /* plus max below */
7353: rowbaseln[nrows] = max2(rbaseln,tbaseln); /*max space above baseline*/
7354: /* --- update max token width in current column --- */
7355: icol = ncols[nrows]; /* current column index */
7356: if ( 0 || fixcolsize[icol]==0 ) /* colwidth not fixed */
7357: colwidth[icol] = max2(colwidth[icol],twidth); /*widest token in col*/
7358: } /* --- end-of-if(toksp[]!=NULL) --- */
7359: /* --- bump counters --- */
7360: if ( !ishonly ) /* don't count only an \hline */
7361: { ntokens++; /* bump total token count */
7362: ncols[nrows] += 1; } /* and bump #cols in current row */
7363: /* --- get ready for next token --- */
7364: tokptr = token; /* reset ptr for next token */
7365: istokwhite = 1; /* next token starts all white */
7366: } /* --- end-of-if(iseoc) --- */
7367: /* -----------------------------------------------------------------------
7368: bump row as necessary
7369: ------------------------------------------------------------------------ */
7370: if ( iseor ) /* we have a completed row */
7371: {
7372: maxcols = max2(maxcols,ncols[nrows]); /* max# cols in array */
7373: if ( ncols[nrows]>0 || hline[nrows]==0 ) /*ignore row with only \hline*/
7374: nrows++; /* bump row count */
7375: ncols[nrows] = 0; /* no cols in this row yet */
7376: if ( !iseox ) /* don't have a null yet */
7377: { exprptr++; /* bump past extra \ in \\ delim */
7378: iseox = (*exprptr == '\000'); } /* recheck for pathological \null */
7379: isnewrow = 1; /* signal start of new row */
7380: } /* --- end-of-if(iseor) --- */
7381: else
7382: isnewrow = 0; /* no longer first col of new row */
7383: /* -----------------------------------------------------------------------
7384: quit when done, or accumulate char in token and proceed to next char
7385: ------------------------------------------------------------------------ */
7386: /* --- quit when done --- */
7387: if ( iseox ) break; /* null terminator signalled done */
7388: /* --- accumulate chars in token --- */
7389: if ( !iseoc ) /* don't accumulate delimiters */
7390: { *tokptr++ = *exprptr; /* accumulate non-delim char */
7391: if ( !isthischar(*exprptr,WHITESPACE) ) /* this token isn't empty */
7392: istokwhite = 0; } /* so reset flag to rasterize it */
7393: /* --- ready for next char --- */
7394: exprptr++; /* bump ptr */
7395: } /* --- end-of-while(*exprptr!='\000') --- */
7396: /* --- make sure we got something to do --- */
7397: if ( nnonwhite < 1 ) /* completely empty array */
7398: goto end_of_job; /* NULL back to caller */
7399: /* -------------------------------------------------------------------------
7400: determine dimensions of array raster and allocate it
7401: -------------------------------------------------------------------------- */
7402: /* --- adjust colspace --- */
7403: colspace = 2 + 2*size; /* temp kludge */
7404: /* --- reset propagated sizes at boundaries of array --- */
7405: colwidth[maxcols] = rowheight[nrows] = 0; /* reset explicit 0's at edges */
7406: /* --- determine width of array raster --- */
7407: width = colspace*(maxcols-1); /* empty space between cols */
7408: if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
7409: fprintf(msgfp,"rastarray> %d cols, widths: ",maxcols);
7410: for ( icol=0; icol<=maxcols; icol++ ) /* and for each col */
7411: { width += colwidth[icol]; /*width of this col (0 for maxcols)*/
7412: width += vlinespace(icol); /*plus space for vline, if present*/
7413: if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
7414: fprintf(msgfp," %d=%2d+%d",icol+1,colwidth[icol],(vlinespace(icol))); }
7415: /* --- determine height of array raster --- */
7416: height = rowspace*(nrows-1); /* empty space between rows */
7417: if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
7418: fprintf(msgfp,"\nrastarray> %d rows, heights: ",nrows);
7419: for ( irow=0; irow<=nrows; irow++ ) /* and for each row */
7420: { height += rowheight[irow]; /*height of this row (0 for nrows)*/
7421: height += hlinespace(irow); /*plus space for hline, if present*/
7422: if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
7423: fprintf(msgfp," %d=%2d+%d",irow+1,rowheight[irow],(hlinespace(irow))); }
7424: /* --- allocate subraster and raster for array --- */
7425: if ( msglevel>=29 && msgfp!=NULL ) /* debugging */
7426: fprintf(msgfp,"\nrastarray> tot width=%d(colspc=%d) height=%d(rowspc=%d)\n",
7427: width,colspace, height,rowspace);
7428: if ( (arraysp=new_subraster(width,height,pixsz)) /* allocate new subraster */
7429: == NULL ) goto end_of_job; /* quit if failed */
7430: /* --- initialize subraster parameters --- */
7431: arraysp->type = IMAGERASTER; /* image */
7432: arraysp->symdef = NULL; /* not applicable for image */
7433: arraysp->baseline=min2(height/2+5,height-1); /*is a little above center good?*/
7434: arraysp->size = size; /* size (probably unneeded) */
7435: arrayrp = arraysp->image; /* raster embedded in subraster */
7436: /* -------------------------------------------------------------------------
7437: embed tokens/cells in array
7438: -------------------------------------------------------------------------- */
7439: itoken = 0; /* start with first token */
7440: toprow = 0; /* start at top row of array */
7441: for ( irow=0; irow<=nrows; irow++ ) /*tokens were accumulated row-wise*/
7442: {
7443: /* --- initialization for row --- */
7444: int baseline = rowbaseln[irow]; /* baseline for this row */
7445: if ( hline[irow] != 0 ) /* need hline above this row */
7446: { int hrow = (irow<1? 0 : toprow - rowspace/2); /* row for hline */
7447: if ( irow >= nrows ) hrow = height-1; /* row for bottom hline */
7448: rule_raster(arrayrp,hrow,0,width,1,(hline[irow]<0?1:0)); } /* hline */
7449: if ( irow >= nrows ) break; /*just needed \hline for irow=nrows*/
7450: toprow += hlinespace(irow); /* space for hline above irow */
7451: leftcol = 0; /* start at leftmost column */
7452: for ( icol=0; icol<ncols[irow]; icol++ ) /* go through cells in this row */
7453: {
7454: subraster *tsp = toksp[itoken]; /* token that belongs in this cell */
7455: if ( tsp != NULL ) /* have a rasterized cell token */
7456: {
7457: /* --- local parameters --- */
7458: int cwidth = colwidth[icol], /* total column width */
7459: twidth = (tsp->image)->width, /* token width */
7460: theight= (tsp->image)->height, /* token height */
7461: tokencol = 0, /*H offset (init for left justify)*/
7462: tokenrow = baseline - tsp->baseline;/*V offset (init for baseline)*/
7463: /* --- adjust leftcol for vline to left of icol, if present ---- */
7464: leftcol += vlinespace(icol); /* space for vline to left of col */
7465: /* --- reset justification (if not left-justified) --- */
7466: if ( justify[icol] == 0 ) /* but user wants it centered */
7467: tokencol = (cwidth-twidth+1)/2; /* so split margin left/right */
7468: else if ( justify[icol] == 1 ) /* or user wants right-justify */
7469: tokencol = cwidth-twidth; /* so put entire margin at left */
7470: /* --- reset vertical centering (if not baseline-aligned) --- */
7471: if ( rowcenter[irow] ) /* center cells in row vertically */
7472: tokenrow = (rowheight[irow]-theight)/2; /* center row */
7473: /* --- embed token raster at appropriate place in array raster --- */
7474: rastput(arrayrp,tsp->image, /* overlay cell token in array */
7475: toprow+ tokenrow, /*with aligned baseline or centered*/
7476: leftcol+tokencol, 1); /* and justified as requested */
7477: } /* --- end-of-if(tsp!=NULL) --- */
7478: itoken++; /* bump index for next cell */
7479: leftcol += colwidth[icol] + colspace /*move leftcol right for next col*/
7480: /* + vlinespace(icol) */ ; /*don't add space for vline to left of col*/
7481: } /* --- end-of-for(icol) --- */
7482: toprow += rowheight[irow] + rowspace; /* move toprow down for next row */
7483: } /* --- end-of-for(irow) --- */
7484: /* -------------------------------------------------------------------------
7485: draw vlines as necessary
7486: -------------------------------------------------------------------------- */
7487: leftcol = 0; /* start at leftmost column */
7488: for ( icol=0; icol<=maxcols; icol++ ) /* check each col for a vline */
7489: {
7490: if ( vline[icol] != 0 ) /* need vline to left of this col */
7491: { int vcol = (icol<1? 0 : leftcol - colspace/2); /* column for vline */
7492: if ( icol >= maxcols ) vcol = width-1; /*column for right edge vline*/
7493: rule_raster(arrayrp,0,vcol,1,height,(vline[icol]<0?2:0)); } /* vline */
7494: leftcol += vlinespace(icol); /* space for vline to left of col */
7495: if ( icol < maxcols ) /* don't address past end of array */
7496: leftcol += colwidth[icol] + colspace; /*move leftcol right for next col*/
7497: } /* --- end-of-for(icol) --- */
7498: /* -------------------------------------------------------------------------
7499: free workspace and return final result to caller
7500: -------------------------------------------------------------------------- */
7501: end_of_job:
7502: /* --- free workspace --- */
7503: if ( ntokens > 0 ) /* if we have workspace to free */
7504: while ( --ntokens >= 0 ) /* free each token subraster */
7505: if ( toksp[ntokens] != NULL ) /* if we rasterized this cell */
7506: delete_subraster(toksp[ntokens]); /* then free it */
7507: /* --- return final result to caller --- */
7508: return ( arraysp );
7509: } /* --- end-of-function rastarray() --- */
7510:
7511:
7512: /* ==========================================================================
7513: * Function: rastpicture ( expression, size, basesp, arg1, arg2, arg3 )
7514: * Purpose: \picture handler, returns subraster corresponding to picture
7515: * expression (immediately following \picture) at font size
7516: * --------------------------------------------------------------------------
7517: * Arguments: expression (I/O) char ** to first char of null-terminated
7518: * string immediately following \picture to be
7519: * rasterized, and returning ptr immediately
7520: * following last character processed.
7521: * size (I) int containing 0-4 default font size
7522: * basesp (I) subraster * to character (or subexpression)
7523: * immediately preceding \picture
7524: * (unused, but passed for consistency)
7525: * arg1 (I) int unused
7526: * arg2 (I) int unused
7527: * arg3 (I) int unused
7528: * --------------------------------------------------------------------------
7529: * Returns: ( subraster * ) ptr to subraster corresponding to picture
7530: * expression, or NULL for any parsing error
7531: * --------------------------------------------------------------------------
7532: * Notes: o Summary of syntax...
7533: * \picture(width,height){(x,y){pic_elem}~(x,y){pic_elem}~etc}
7534: * o
7535: * ======================================================================= */
7536: /* --- entry point --- */
7537: subraster *rastpicture ( char **expression, int size, subraster *basesp,
7538: int arg1, int arg2, int arg3 )
7539: {
7540: /* -------------------------------------------------------------------------
7541: Allocations and Declarations
7542: -------------------------------------------------------------------------- */
7543: char *texsubexpr(), picexpr[2049], *picptr=picexpr, /* picture {expre} */
7544: putexpr[256], *putptr,*multptr, /*[multi]put (x,y[;xinc,yinc;num])*/
7545: pream[64], *preptr, /* optional put preamble */
7546: picelem[1025]; /* picture element following put */
7547: subraster *rasterize(), *picelemsp=NULL, /* rasterize picture elements */
7548: *new_subraster(), *picturesp=NULL, /* subraster for entire picture */
7549: *oldworkingbox = workingbox; /* save working box on entry */
7550: raster *picturerp=NULL; /* raster for entire picture */
7551: int delete_subraster(); /* free picelemsp[] workspace */
7552: int pixsz = 1; /* pixels are one bit each */
7553: double strtod(), /* convert ascii params to doubles */
7554: x=0.0,y=0.0, /* x,y-coords for put,multiput*/
7555: xinc=0.0,yinc=0.0; /* x,y-incrementss for multiput*/
7556: int width=0, height=0, /* #pixels width,height of picture */
7557: ewidth=0, eheight=0, /* pic element width,height */
7558: ix=0,xpos=0, iy=0,ypos=0, /* mimeTeX x,y pixel coords */
7559: num=1, inum; /* number reps, index of element */
7560: int iscenter=0; /* center or lowerleft put position*/
7561: int *oldworkingparam = workingparam, /* save working param on entry */
7562: origin = 0; /* x,yinc ++=00 +-=01 -+=10 --=11 */
7563: int rastput(); /* embed elements in picture */
7564: int type_raster(); /* display debugging output */
7565: /* -------------------------------------------------------------------------
7566: First obtain (width,height) arguments immediately following \picture command
7567: -------------------------------------------------------------------------- */
7568: /* --- parse for (width,height) arguments, and bump expression past it --- */
7569: *expression = texsubexpr(*expression,putexpr,254,"(",")",0,0);
7570: if ( *putexpr == '\000' ) goto end_of_job; /* couldn't get (width,height) */
7571: /* --- now interpret width,height returned in putexpr --- */
7572: if ( (putptr=strchr(putexpr,',')) != NULL ) /* look for ',' in width,height*/
7573: *putptr = '\000'; /* found it, so replace ',' by '\0'*/
7574: width=height = iround(unitlength*strtod(putexpr,NULL)); /*width pixels*/
7575: if ( putptr != NULL ) /* 2nd arg, if present, is height */
7576: height = iround(unitlength*strtod(putptr+1,NULL)); /*in pixels*/
7577: /* -------------------------------------------------------------------------
7578: Then obtain entire picture {...} subexpression following (width,height)
7579: -------------------------------------------------------------------------- */
7580: /* --- parse for picture subexpression, and bump expression past it --- */
7581: *expression = texsubexpr(*expression,picexpr,2047,"{","}",0,0);
7582: if ( *picexpr == '\000' ) goto end_of_job; /* couldn't get {pic_elements} */
7583: /* -------------------------------------------------------------------------
7584: allocate subraster and raster for complete picture
7585: -------------------------------------------------------------------------- */
7586: /* --- sanity check on width,height args --- */
7587: if ( width < 2 || width > 600
7588: || height < 2 || height > 600 ) goto end_of_job;
7589: /* --- allocate and initialize subraster for constructed picture --- */
7590: if ( (picturesp=new_subraster(width,height,pixsz)) /*allocate new subraster*/
7591: == NULL ) goto end_of_job; /* quit if failed */
7592: workingbox = picturesp; /* set workingbox to our picture */
7593: /* --- initialize picture subraster parameters --- */
7594: picturesp->type = IMAGERASTER; /* image */
7595: picturesp->symdef = NULL; /* not applicable for image */
7596: picturesp->baseline = height/2 + 2; /* is a little above center good? */
7597: picturesp->size = size; /* size (probably unneeded) */
7598: picturerp = picturesp->image; /* raster embedded in subraster */
7599: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
7600: fprintf(msgfp,"picture> width,height=%d,%d\n",width,height);
7601: /* -------------------------------------------------------------------------
7602: parse out each picture element, rasterize it, and place it in picture
7603: -------------------------------------------------------------------------- */
7604: while ( *picptr != '\000' ) /* until we run out of pic_elems */
7605: {
7606: /* -----------------------------------------------------------------------
7607: first obtain leading \[multi]put(x,y[;xinc,yinc;num]) args for pic_elem
7608: ------------------------------------------------------------------------ */
7609: /* --- init default values in case not explicitly supplied in args --- */
7610: x=y=0.0; xinc=yinc=0.0; num=1; /* init default values */
7611: iscenter = origin = 0; /* center, origin */
7612: /* --- get (pream$x,y;xinc,yinc;num ) args and bump picptr past it --- */
7613: while ( *picptr != '\000' ) /* skip invalid chars preceding ( */
7614: if ( *picptr == '(' ) break; /* found opening ( */
7615: else picptr++; /* else skip invalid char */
7616: picptr = texsubexpr(picptr,putexpr,254,"(",")",0,0);
7617: if ( *putexpr == '\000' ) goto end_of_job; /* couldn't get (x,y) */
7618: /* --- first look for $-terminated or for any non-digit preamble --- */
7619: *pream = '\000'; /* init preamble as empty string */
7620: if ( (putptr=strchr(putexpr,'$')) != NULL ) /*check for $ pream terminator*/
7621: { *putptr++ = '\000'; /* replace $ by '\0', bump past $ */
7622: strcpy(pream,putexpr); } /* copy leading preamble from put */
7623: else /* look for any non-digit preamble */
7624: { for ( preptr=pream,putptr=putexpr; ; putptr++ )
7625: if ( *putptr == '\000' /* end-of-putdata signalled */
7626: || !isalpha((int)(*putptr)) ) break; /* or found non-alpha char */
7627: else *preptr++ = *putptr; /* copy alpha char to preamble */
7628: *preptr = '\000'; } /* null-terminate preamble */
7629: /* --- interpret preamble --- */
7630: for ( preptr=pream; ; preptr++ ) /* examine each preamble char */
7631: if ( *preptr == '\000' ) break; /* end-of-preamble signalled */
7632: else switch ( tolower(*preptr) ) /* check lowercase preamble char */
7633: {
7634: default: break; /* unrecognized flag */
7635: case 'c': iscenter=1; break; /* center pic_elem at x,y coords */
7636: } /* --- end-of-switch --- */
7637: /* --- interpret x,y;xinc,yinc;num following preamble --- */
7638: if ( *putptr != '\000' ) /*check for put data after preamble*/
7639: {
7640: /* --- first squeeze preamble out of put expression --- */
7641: if ( *pream != '\000' ) strcpy(putexpr,putptr); /* squeeze out preamble */
7642: /* --- interpret x,y --- */
7643: if ( (multptr=strchr(putexpr,';')) != NULL ) /*semicolon signals multiput*/
7644: *multptr = '\000'; /* replace semicolon by '\0' */
7645: if ( (putptr=strchr(putexpr,',')) != NULL ) /* comma separates x,y */
7646: *putptr = '\000'; /* replace comma by '\0' */
7647: if ( *putexpr != '\000' ) /* leading , may be placeholder */
7648: x = unitlength*strtod(putexpr,NULL); /* x coord in pixels*/
7649: if ( putptr != NULL ) /* 2nd arg, if present, is y coord */
7650: y = unitlength*strtod(putptr+1,NULL); /* in pixels */
7651: /* --- interpret xinc,yinc,num if we have a multiput --- */
7652: if ( multptr != NULL ) /* found ';' signalling multiput */
7653: {
7654: if ( (preptr=strchr(multptr+1,';')) != NULL ) /* ';' preceding num arg*/
7655: *preptr = '\000'; /* replace ';' by '\0' */
7656: if ( (putptr=strchr(multptr+1,',')) != NULL ) /* ',' between xinc,yinc*/
7657: *putptr = '\000'; /* replace ',' by '\0' */
7658: if ( *(multptr+1) != '\000' ) /* leading , may be placeholder */
7659: xinc = unitlength*strtod(multptr+1,NULL); /* xinc in pixels */
7660: if ( putptr != NULL ) /* 2nd arg, if present, is yinc */
7661: yinc = unitlength*strtod(putptr+1,NULL); /* in user pixels */
7662: num = (preptr==NULL? 999 : atoi(preptr+1)); /*explicit num val or 999*/
7663: } /* --- end-of-if(multptr!=NULL) --- */
7664: } /* --- end-of-if(*preptr!='\000') --- */
7665: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
7666: fprintf(msgfp,
7667: "picture> pream;x,y;xinc,yinc;num=\"%s\";%.2f,%.2f;%.2f,%.2f;%d\n",
7668: pream,x,y,xinc,yinc,num);
7669: /* -----------------------------------------------------------------------
7670: now obtain {...} picture element following [multi]put, and rasterize it
7671: ------------------------------------------------------------------------ */
7672: /* --- parse for {...} picture element and bump picptr past it --- */
7673: picptr = texsubexpr(picptr,picelem,1023,"{","}",0,0);
7674: if ( *picelem == '\000' ) goto end_of_job; /* couldn't get {pic_elem} */
7675: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
7676: fprintf(msgfp, "picture> picelem=\"%.50s\"\n",picelem);
7677: /* --- rasterize picture element --- */
7678: origin = 0; /* init origin as working param */
7679: workingparam = &origin; /* and point working param to it */
7680: picelemsp = rasterize(picelem,size); /* rasterize picture element */
7681: if ( picelemsp == NULL ) continue; /* failed to rasterize, skip elem */
7682: ewidth = (picelemsp->image)->width; /* width of element, in pixels */
7683: eheight = (picelemsp->image)->height; /* height of element, in pixels */
7684: if ( origin == 55 ) iscenter = 1; /* origin set to (.5,.5) for center*/
7685: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
7686: { fprintf(msgfp, "picture> ewidth,eheight,origin,num=%d,%d,%d,%d\n",
7687: ewidth,eheight,origin,num);
7688: if ( msglevel >= 999 ) type_raster(picelemsp->image,msgfp); }
7689: /* -----------------------------------------------------------------------
7690: embed element in picture (once, or multiple times if requested)
7691: ------------------------------------------------------------------------ */
7692: for ( inum=0; inum<num; inum++ ) /* once, or for num repetitions */
7693: {
7694: /* --- set x,y-coords for this iteration --- */
7695: ix = iround(x); iy = iround(y); /* round x,y to nearest integer */
7696: if ( iscenter ) /* place center of element at x,y */
7697: { xpos = ix - ewidth/2; /* x picture coord to center elem */
7698: ypos = height - iy - eheight/2; } /* y pixel coord to center elem */
7699: else /* default places lower-left at x,y*/
7700: { xpos = ix; /* set x pixel coord for left */
7701: if ( origin==10 || origin==11 ) /* x,yinc's are -+ or -- */
7702: xpos = ix - ewidth; /* so set for right instead */
7703: ypos = height - iy - eheight; /* set y pixel coord for lower */
7704: if ( origin==1 || origin==11 ) /* x,yinc's are +- or -- */
7705: ypos = height - iy; } /* so set for upper instead */
7706: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
7707: fprintf(msgfp,
7708: "picture> inum,x,y,ix,iy,xpos,ypos=%d,%.2f,%.2f,%d,%d,%d,%d\n",
7709: inum,x,y,ix,iy,xpos,ypos);
7710: /* --- embed token raster at xpos,ypos, and quit if out-of-bounds --- */
7711: if ( !rastput(picturerp,picelemsp->image,ypos,xpos,0) ) break;
7712: /* --- apply increment --- */
7713: if ( xinc==0. && yinc==0. ) break; /* quit if both increments zero */
7714: x += xinc; y += yinc; /* increment coords for next iter */
7715: } /* --- end-of-for(inum) --- */
7716: /* --- free picture element subraster after embedding it in picture --- */
7717: delete_subraster(picelemsp); /* done with subraster, so free it */
7718: } /* --- end-of-while(*picptr!=0) --- */
7719: /* -------------------------------------------------------------------------
7720: return picture constructed from pic_elements to caller
7721: -------------------------------------------------------------------------- */
7722: end_of_job:
7723: workingbox = oldworkingbox; /* restore original working box */
7724: workingparam = oldworkingparam; /* restore original working param */
7725: return ( picturesp ); /* return our picture to caller */
7726: } /* --- end-of-function rastpicture() --- */
7727:
7728:
7729: /* ==========================================================================
7730: * Function: rastline ( expression, size, basesp, arg1, arg2, arg3 )
7731: * Purpose: \line handler, returns subraster corresponding to line
7732: * parameters (xinc,yinc){xlen}
7733: * --------------------------------------------------------------------------
7734: * Arguments: expression (I/O) char ** to first char of null-terminated
7735: * string immediately following \line to be
7736: * rasterized, and returning ptr immediately
7737: * following last character processed.
7738: * size (I) int containing 0-4 default font size
7739: * basesp (I) subraster * to character (or subexpression)
7740: * immediately preceding \line
7741: * (unused, but passed for consistency)
7742: * arg1 (I) int unused
7743: * arg2 (I) int unused
7744: * arg3 (I) int unused
7745: * --------------------------------------------------------------------------
7746: * Returns: ( subraster * ) ptr to subraster corresponding to line
7747: * requested, or NULL for any parsing error
7748: * --------------------------------------------------------------------------
7749: * Notes: o Summary of syntax...
7750: * \line(xinc,yinc){xlen}
7751: * o if {xlen} not given, then it's assumed xlen = |xinc|
7752: * ======================================================================= */
7753: /* --- entry point --- */
7754: subraster *rastline ( char **expression, int size, subraster *basesp,
7755: int arg1, int arg2, int arg3 )
7756: {
7757: /* -------------------------------------------------------------------------
7758: Allocations and Declarations
7759: -------------------------------------------------------------------------- */
7760: char *texsubexpr(),linexpr[257], *xptr=linexpr; /*line(xinc,yinc){xlen}*/
7761: subraster *new_subraster(), *linesp=NULL; /* subraster for line */
7762: /*char *origexpression = *expression;*/ /*original expression after \line*/
7763: int pixsz = 1; /* pixels are one bit each */
7764: double strtod(), /* convert ascii params to doubles */
7765: xinc=0.0, yinc=0.0, /* x,y-increments for line, */
7766: xlen=0.0, ylen=0.0; /* x,y lengths for line */
7767: int width=0, height=0; /* #pixels width,height of line */
7768: int istop=0, isright=0, /* origin at bot-left if x,yinc>=0 */
7769: origin = 0; /* x,yinc: ++=00 +-=01 -+=10 --=11 */
7770: int line_raster(); /* draw line in linesp->image */
7771: /* -------------------------------------------------------------------------
7772: obtain (xinc,yinc) arguments immediately following \line command
7773: -------------------------------------------------------------------------- */
7774: /* --- parse for (xinc,yinc) arguments, and bump expression past it --- */
7775: *expression = texsubexpr(*expression,linexpr,253,"(",")",0,0);
7776: if ( *linexpr == '\000' ) goto end_of_job; /* couldn't get (xinc,yinc) */
7777: /* --- now interpret xinc,yinc returned in linexpr --- */
7778: if ( (xptr=strchr(linexpr,',')) != NULL ) /* look for ',' in xinc,yinc */
7779: *xptr = '\000'; /* found it, so replace ',' by '\0'*/
7780: if ( *linexpr != '\000' ) /* check against missing 1st arg */
7781: xinc = xlen = strtod(linexpr,NULL); /* xinc in user units */
7782: if ( xptr != NULL ) /* 2nd arg, if present, is yinc */
7783: yinc = ylen = strtod(xptr+1,NULL); /* in user units */
7784: /* -------------------------------------------------------------------------
7785: obtain optional {xlen} following (xinc,yinc), and calculate ylen
7786: -------------------------------------------------------------------------- */
7787: /* --- check if {xlen} given --- */
7788: if ( *(*expression) == '{' ) /*have {xlen} if leading char is { */
7789: {
7790: /* --- parse {xlen} and bump expression past it, interpret as double --- */
7791: *expression = texsubexpr(*expression,linexpr,253,"{","}",0,0);
7792: if ( *linexpr == '\000' ) goto end_of_job; /* couldn't get {xlen} */
7793: xlen = strtod(linexpr,NULL); /* xlen in user units */
7794: /* --- set other values accordingly --- */
7795: if ( xlen < 0.0 ) xinc = -xinc; /* if xlen negative, flip xinc sign*/
7796: if ( xinc != 0.0 ) ylen = xlen*yinc/xinc; /* set ylen from xlen and slope*/
7797: else xlen = 0.0; /* can't have xlen if xinc=0 */
7798: } /* --- end-of-if(*(*expression)=='{') --- */
7799: /* -------------------------------------------------------------------------
7800: calculate width,height, etc, based on xlen,ylen, etc
7801: -------------------------------------------------------------------------- */
7802: /* --- force lengths positive --- */
7803: xlen = absval(xlen); /* force xlen positive */
7804: ylen = absval(ylen); /* force ylen positive */
7805: /* --- calculate corresponding lengths in pixels --- */
7806: width = max2(1,iround(unitlength*xlen)); /*scale by unitlength and round,*/
7807: height = max2(1,iround(unitlength*ylen)); /* and must be at least 1 pixel */
7808: /* --- set origin corner, x,yinc's: ++=0=(0,0) +-=1=(0,1) -+=10=(1,0) --- */
7809: if ( xinc < 0.0 ) isright = 1; /*negative xinc, so corner is (1,?)*/
7810: if ( yinc < 0.0 ) istop = 1; /*negative yinc, so corner is (?,1)*/
7811: origin = isright*10 + istop; /* interpret 0=(0,0), 11=(1,1), etc*/
7812: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
7813: fprintf(msgfp,"rastline> width,height,origin;x,yinc=%d,%d,%d;%g,%g\n",
7814: width,height,origin,xinc,yinc);
7815: /* -------------------------------------------------------------------------
7816: allocate subraster and raster for complete picture
7817: -------------------------------------------------------------------------- */
7818: /* --- sanity check on width,height args --- */
7819: if ( width < 1 || width > 600
7820: || height < 1 || height > 600 ) goto end_of_job;
7821: /* --- allocate and initialize subraster for constructed line --- */
7822: if ( (linesp=new_subraster(width,height,pixsz)) /* allocate new subraster */
7823: == NULL ) goto end_of_job; /* quit if failed */
7824: /* --- initialize line subraster parameters --- */
7825: linesp->type = IMAGERASTER; /* image */
7826: linesp->symdef = NULL; /* not applicable for image */
7827: linesp->baseline = height/2 + 2; /* is a little above center good? */
7828: linesp->size = size; /* size (probably unneeded) */
7829: /* -------------------------------------------------------------------------
7830: draw the line
7831: -------------------------------------------------------------------------- */
7832: line_raster ( linesp->image, /* embedded raster image */
7833: (istop? 0 : height-1), /* row0, from bottom or top */
7834: (isright? width-1 : 0), /* col0, from left or right */
7835: (istop? height-1 : 0), /* row1, to top or bottom */
7836: (isright? 0 : width-1), /* col1, to right or left */
7837: 1 ); /* line thickness is 1 pixel */
7838: /* -------------------------------------------------------------------------
7839: return constructed line to caller
7840: -------------------------------------------------------------------------- */
7841: end_of_job:
7842: if ( workingparam != NULL ) /* caller wants origin */
7843: *workingparam = origin; /* return origin corner to caller */
7844: return ( linesp ); /* return line to caller */
7845: } /* --- end-of-function rastline() --- */
7846:
7847:
7848: /* ==========================================================================
7849: * Function: rastcircle ( expression, size, basesp, arg1, arg2, arg3 )
7850: * Purpose: \circle handler, returns subraster corresponding to ellipse
7851: * parameters (xdiam[,ydiam])
7852: * --------------------------------------------------------------------------
7853: * Arguments: expression (I/O) char ** to first char of null-terminated
7854: * string immediately following \circle to be
7855: * rasterized, and returning ptr immediately
7856: * following last character processed.
7857: * size (I) int containing 0-4 default font size
7858: * basesp (I) subraster * to character (or subexpression)
7859: * immediately preceding \circle
7860: * (unused, but passed for consistency)
7861: * arg1 (I) int unused
7862: * arg2 (I) int unused
7863: * arg3 (I) int unused
7864: * --------------------------------------------------------------------------
7865: * Returns: ( subraster * ) ptr to subraster corresponding to ellipse
7866: * requested, or NULL for any parsing error
7867: * --------------------------------------------------------------------------
7868: * Notes: o Summary of syntax...
7869: * \circle(xdiam[,ydiam])
7870: * o
7871: * ======================================================================= */
7872: /* --- entry point --- */
7873: subraster *rastcircle ( char **expression, int size, subraster *basesp,
7874: int arg1, int arg2, int arg3 )
7875: {
7876: /* -------------------------------------------------------------------------
7877: Allocations and Declarations
7878: -------------------------------------------------------------------------- */
7879: char *texsubexpr(), circexpr[512],*xptr=circexpr; /*circle(xdiam[,ydiam])*/
7880: char *qptr=NULL, quads[256]="1234"; /* default to draw all quadrants */
7881: double theta0=0.0, theta1=0.0; /* ;theta0,theta1 instead of ;quads*/
7882: subraster *new_subraster(), *circsp=NULL; /* subraster for ellipse */
7883: int pixsz = 1; /* pixels are one bit each */
7884: double strtod(), /* convert ascii params to doubles */
7885: xdiam=0.0, ydiam=0.0; /* x,y major/minor axes/diameters */
7886: int width=0, height=0; /* #pixels width,height of ellipse */
7887: int thickness = 1; /* drawn lines are one pixel thick */
7888: int origin = 55; /* force origin centered */
7889: int circle_raster(), /* draw ellipse in circsp->image */
7890: circle_recurse(); /* for theta0,theta1 args */
7891: /* -------------------------------------------------------------------------
7892: obtain (xdiam[,ydiam]) arguments immediately following \circle command
7893: -------------------------------------------------------------------------- */
7894: /* --- parse for (xdiam[,ydiam]) args, and bump expression past it --- */
7895: *expression = texsubexpr(*expression,circexpr,511,"(",")",0,0);
7896: if ( *circexpr == '\000' ) goto end_of_job; /* couldn't get (xdiam[,ydiam])*/
7897: /* --- now interpret xdiam[,ydiam] returned in circexpr --- */
7898: if ( (qptr=strchr(circexpr,';')) != NULL ) /* semicolon signals quads data */
7899: { *qptr = '\000'; /* replace semicolon by '\0' */
7900: strcpy(quads,qptr+1); /* save user-requested quads */
7901: if ( (qptr=strchr(quads,',')) != NULL ) /* have theta0,theta1 instead */
7902: { *qptr = '\000'; /* replace , with null */
7903: theta0 = strtod(quads,NULL); /* theta0 precedes , */
7904: theta1 = strtod(qptr+1,NULL); /* theta1 follows , */
7905: qptr = NULL; } /* signal thetas instead of quads */
7906: else
7907: qptr = quads; } /* set qptr arg for circle_raster()*/
7908: else /* no ;quads at all */
7909: qptr = quads; /* default to all 4 quadrants */
7910: if ( (xptr=strchr(circexpr,',')) != NULL ) /* look for ',' in xdiam[,ydiam]*/
7911: *xptr = '\000'; /* found it, so replace ',' by '\0'*/
7912: xdiam = ydiam = strtod(circexpr,NULL); /* xdiam=ydiam in user units */
7913: if ( xptr != NULL ) /* 2nd arg, if present, is ydiam */
7914: ydiam = strtod(xptr+1,NULL); /* in user units */
7915: /* -------------------------------------------------------------------------
7916: calculate width,height, etc
7917: -------------------------------------------------------------------------- */
7918: /* --- calculate width,height in pixels --- */
7919: width = max2(1,iround(unitlength*xdiam)); /*scale by unitlength and round,*/
7920: height = max2(1,iround(unitlength*ydiam)); /* and must be at least 1 pixel */
7921: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
7922: fprintf(msgfp,"rastcircle> width,height;quads=%d,%d,%s\n",
7923: width,height,(qptr==NULL?"default":qptr));
7924: /* -------------------------------------------------------------------------
7925: allocate subraster and raster for complete picture
7926: -------------------------------------------------------------------------- */
7927: /* --- sanity check on width,height args --- */
7928: if ( width < 1 || width > 600
7929: || height < 1 || height > 600 ) goto end_of_job;
7930: /* --- allocate and initialize subraster for constructed ellipse --- */
7931: if ( (circsp=new_subraster(width,height,pixsz)) /* allocate new subraster */
7932: == NULL ) goto end_of_job; /* quit if failed */
7933: /* --- initialize ellipse subraster parameters --- */
7934: circsp->type = IMAGERASTER; /* image */
7935: circsp->symdef = NULL; /* not applicable for image */
7936: circsp->baseline = height/2 + 2; /* is a little above center good? */
7937: circsp->size = size; /* size (probably unneeded) */
7938: /* -------------------------------------------------------------------------
7939: draw the ellipse
7940: -------------------------------------------------------------------------- */
7941: if ( qptr != NULL ) /* have quads */
7942: circle_raster ( circsp->image, /* embedded raster image */
7943: 0, 0, /* row0,col0 are upper-left corner */
7944: height-1, width-1, /* row1,col1 are lower-right */
7945: thickness, /* line thickness is 1 pixel */
7946: qptr ); /* "1234" quadrants to be drawn */
7947: else /* have theta0,theta1 */
7948: circle_recurse ( circsp->image, /* embedded raster image */
7949: 0, 0, /* row0,col0 are upper-left corner */
7950: height-1, width-1, /* row1,col1 are lower-right */
7951: thickness, /* line thickness is 1 pixel */
7952: theta0,theta1 ); /* theta0,theta1 arc to be drawn */
7953: /* -------------------------------------------------------------------------
7954: return constructed ellipse to caller
7955: -------------------------------------------------------------------------- */
7956: end_of_job:
7957: if ( workingparam != NULL ) /* caller wants origin */
7958: *workingparam = origin; /* return center origin to caller */
7959: return ( circsp ); /* return ellipse to caller */
7960: } /* --- end-of-function rastcircle() --- */
7961:
7962:
7963: /* ==========================================================================
7964: * Function: rastbezier ( expression, size, basesp, arg1, arg2, arg3 )
7965: * Purpose: \bezier handler, returns subraster corresponding to bezier
7966: * parameters (col0,row0)(col1,row1)(colt,rowt)
7967: * --------------------------------------------------------------------------
7968: * Arguments: expression (I/O) char ** to first char of null-terminated
7969: * string immediately following \bezier to be
7970: * rasterized, and returning ptr immediately
7971: * following last character processed.
7972: * size (I) int containing 0-5 default font size
7973: * basesp (I) subraster * to character (or subexpression)
7974: * immediately preceding \bezier
7975: * (unused, but passed for consistency)
7976: * arg1 (I) int unused
7977: * arg2 (I) int unused
7978: * arg3 (I) int unused
7979: * --------------------------------------------------------------------------
7980: * Returns: ( subraster * ) ptr to subraster corresponding to bezier
7981: * requested, or NULL for any parsing error
7982: * --------------------------------------------------------------------------
7983: * Notes: o Summary of syntax...
7984: * \bezier(col1,row1)(colt,rowt)
7985: * o col0=0,row0=0 assumed, i.e., given by
7986: * \picture(){~(col0,row0){\bezier(col1,row1)(colt,rowt)}~}
7987: * ======================================================================= */
7988: /* --- entry point --- */
7989: subraster *rastbezier ( char **expression, int size, subraster *basesp,
7990: int arg1, int arg2, int arg3 )
7991: {
7992: /* -------------------------------------------------------------------------
7993: Allocations and Declarations
7994: -------------------------------------------------------------------------- */
7995: subraster *new_subraster(), *bezsp=NULL; /* subraster for bezier */
7996: char *texsubexpr(), bezexpr[129],*xptr=bezexpr; /*\bezier(r,c)(r,c)(r,c)*/
7997: double strtod(); /* convert ascii params to doubles */
7998: double r0=0.0,c0=0.0, r1=0.0,c1=0.0, rt=0.0,ct=0.0, /* bezier points */
7999: rmid=0.0, cmid=0.0, /* coords at parameterized midpoint*/
8000: rmin=0.0, cmin=0.0, /* minimum r,c */
8001: rmax=0.0, cmax=0.0, /* maximum r,c */
8002: rdelta=0.0, cdelta=0.0, /* rmax-rmin, cmax-cmin */
8003: r=0.0, c=0.0; /* some point */
8004: int iarg=0; /* 0=r0,c0 1=r1,c1 2=rt,ct */
8005: int width=0, height=0; /* dimensions of bezier raster */
8006: int pixsz = 1; /* pixels are one bit each */
8007: /*int thickness = 1;*/ /* drawn lines are one pixel thick */
8008: int origin = 0; /*c's,r's reset to lower-left origin*/
8009: int bezier_raster(); /* draw bezier in bezsp->image */
8010: /* -------------------------------------------------------------------------
8011: obtain (c1,r1)(ct,rt) args immediately following \bezier command
8012: -------------------------------------------------------------------------- */
8013: for ( iarg=1; iarg<=2; iarg++ ) /* 0=c0,r0 1=c1,r1 2=ct,rt */
8014: {
8015: /* --- parse for (r,c) args, and bump expression past them all --- */
8016: *expression = texsubexpr(*expression,bezexpr,127,"(",")",0,0);
8017: if ( *bezexpr == '\000' ) goto end_of_job; /* couldn't get (r,c)*/
8018: /* --- now interpret (r,c) returned in bezexpr --- */
8019: c = r = 0.0; /* init x-coord=col, y-coord=row */
8020: if ( (xptr=strchr(bezexpr,',')) != NULL ) /* comma separates row,col */
8021: { *xptr = '\000'; /* found it, so replace ',' by '\0'*/
8022: r = unitlength*strtod(xptr+1,NULL); } /* row=y-coord in pixels */
8023: c = unitlength*strtod(bezexpr,NULL); /* col=x-coord in pixels */
8024: /* --- store r,c --- */
8025: switch ( iarg )
8026: { case 0: r0=r; c0=c; break;
8027: case 1: r1=r; c1=c; break;
8028: case 2: rt=r; ct=c; break; }
8029: } /* --- end-of-for(iarg) --- */
8030: /* --- determine midpoint and maximum,minimum points --- */
8031: rmid = 0.5*(rt + 0.5*(r0+r1)); /* y-coord at middle of bezier */
8032: cmid = 0.5*(ct + 0.5*(c0+c1)); /* x-coord at middle of bezier */
8033: rmin = min3(r0,r1,rmid); /* lowest row */
8034: cmin = min3(c0,c1,cmid); /* leftmost col */
8035: rmax = max3(r0,r1,rmid); /* highest row */
8036: cmax = max3(c0,c1,cmid); /* rightmost col */
8037: rdelta = rmax-rmin; /* height */
8038: cdelta = cmax-cmin; /* width */
8039: /* --- rescale coords so we start at 0,0 --- */
8040: r0 -= rmin; c0 -= cmin; /* rescale r0,c0 */
8041: r1 -= rmin; c1 -= cmin; /* rescale r1,c1 */
8042: rt -= rmin; ct -= cmin; /* rescale rt,ct */
8043: /* --- flip rows so 0,0 becomes lower-left corner instead of upper-left--- */
8044: r0 = rdelta - r0 + 1; /* map 0-->height-1, height-1-->0 */
8045: r1 = rdelta - r1 + 1;
8046: rt = rdelta - rt + 1;
8047: /* --- determine width,height of raster needed for bezier --- */
8048: width = (int)(cdelta + 0.9999) + 1; /* round width up */
8049: height = (int)(rdelta + 0.9999) + 1; /* round height up */
8050: if ( msgfp!=NULL && msglevel>=29 ) /* debugging */
8051: fprintf(msgfp,"rastbezier> width,height,origin=%d,%d,%d; c0,r0=%g,%g; "
8052: "c1,r1=%g,%g\n rmin,mid,max=%g,%g,%g; cmin,mid,max=%g,%g,%g\n",
8053: width,height,origin, c0,r0, c1,r1, rmin,rmid,rmax, cmin,cmid,cmax);
8054: /* -------------------------------------------------------------------------
8055: allocate raster
8056: -------------------------------------------------------------------------- */
8057: /* --- sanity check on width,height args --- */
8058: if ( width < 1 || width > 600
8059: || height < 1 || height > 600 ) goto end_of_job;
8060: /* --- allocate and initialize subraster for constructed bezier --- */
8061: if ( (bezsp=new_subraster(width,height,pixsz)) /* allocate new subraster */
8062: == NULL ) goto end_of_job; /* quit if failed */
8063: /* --- initialize bezier subraster parameters --- */
8064: bezsp->type = IMAGERASTER; /* image */
8065: bezsp->symdef = NULL; /* not applicable for image */
8066: bezsp->baseline = height/2 + 2; /* is a little above center good? */
8067: bezsp->size = size; /* size (probably unneeded) */
8068: /* -------------------------------------------------------------------------
8069: draw the bezier
8070: -------------------------------------------------------------------------- */
8071: bezier_raster ( bezsp->image, /* embedded raster image */
8072: r0, c0, /* row0,col0 are lower-left corner */
8073: r1, c1, /* row1,col1 are upper-right */
8074: rt, ct ); /* bezier tangent point */
8075: /* -------------------------------------------------------------------------
8076: return constructed bezier to caller
8077: -------------------------------------------------------------------------- */
8078: end_of_job:
8079: if ( workingparam != NULL ) /* caller wants origin */
8080: *workingparam = origin; /* return center origin to caller */
8081: return ( bezsp ); /* return bezier to caller */
8082: } /* --- end-of-function rastbezier() --- */
8083:
8084:
8085: /* ==========================================================================
8086: * Function: rastraise ( expression, size, basesp, arg1, arg2, arg3 )
8087: * Purpose: \raisebox{lift}{subexpression} handler, returns subraster
8088: * containing subexpression with its baseline "lifted" by lift
8089: * pixels, scaled by \unitlength, or "lowered" if lift arg
8090: * negative
8091: * --------------------------------------------------------------------------
8092: * Arguments: expression (I/O) char ** to first char of null-terminated
8093: * string immediately following \raisebox to be
8094: * rasterized, and returning ptr immediately
8095: * following last character processed.
8096: * size (I) int containing 0-5 default font size
8097: * basesp (I) subraster * to character (or subexpression)
8098: * immediately preceding \rotatebox
8099: * (unused, but passed for consistency)
8100: * arg1 (I) int unused
8101: * arg2 (I) int unused
8102: * arg3 (I) int unused
8103: * --------------------------------------------------------------------------
8104: * Returns: ( subraster * ) ptr to subraster corresponding to \raisebox
8105: * requested, or NULL for any parsing error
8106: * --------------------------------------------------------------------------
8107: * Notes: o Summary of syntax...
8108: * \raisebox{lift}{subexpression}
8109: * o
8110: * ======================================================================= */
8111: /* --- entry point --- */
8112: subraster *rastraise ( char **expression, int size, subraster *basesp,
8113: int arg1, int arg2, int arg3 )
8114: {
8115: /* -------------------------------------------------------------------------
8116: Allocations and Declarations
8117: -------------------------------------------------------------------------- */
8118: char *texsubexpr(), subexpr[8192], *liftexpr=subexpr; /* args */
8119: subraster *rasterize(), *raisesp=NULL; /* rasterize subexpr to be raised */
8120: int lift=0; /* amount to raise/lower baseline */
8121: /* -------------------------------------------------------------------------
8122: obtain {lift} argument immediately following \raisebox command
8123: -------------------------------------------------------------------------- */
8124: /* --- parse for {lift} arg, and bump expression past it --- */
8125: *expression = texsubexpr(*expression,liftexpr,0,"{","}",0,0);
8126: if ( *liftexpr == '\000' ) goto end_of_job; /* couldn't get {lift} */
8127: lift = (int)((unitlength*strtod(liftexpr,NULL))+0.0); /*{lift} to integer*/
8128: if ( abs(lift) > 200 ) lift=0; /* sanity check */
8129: /* -------------------------------------------------------------------------
8130: obtain {subexpr} argument after {lift}, and rasterize it
8131: -------------------------------------------------------------------------- */
8132: /* --- parse for {subexpr} arg, and bump expression past it --- */
8133: *expression = texsubexpr(*expression,subexpr,0,"{","}",0,0);
8134: /* --- rasterize subexpression to be raised/lowered --- */
8135: if ( (raisesp = rasterize(subexpr,size)) /* rasterize subexpression */
8136: == NULL ) goto end_of_job; /* and quit if failed */
8137: /* -------------------------------------------------------------------------
8138: raise/lower baseline and return it to caller
8139: -------------------------------------------------------------------------- */
8140: /* --- raise/lower baseline --- */
8141: raisesp->baseline += lift; /* new baseline (no height checks) */
8142: /* --- return raised subexpr to caller --- */
8143: end_of_job:
8144: return ( raisesp ); /* return raised subexpr to caller */
8145: } /* --- end-of-function rastraise() --- */
8146:
8147:
8148: /* ==========================================================================
8149: * Function: rastrotate ( expression, size, basesp, arg1, arg2, arg3 )
8150: * Purpose: \rotatebox{degrees}{subexpression} handler, returns subraster
8151: * containing subexpression rotated by degrees (counterclockwise
8152: * if degrees positive)
8153: * --------------------------------------------------------------------------
8154: * Arguments: expression (I/O) char ** to first char of null-terminated
8155: * string immediately following \rotatebox to be
8156: * rasterized, and returning ptr immediately
8157: * following last character processed.
8158: * size (I) int containing 0-5 default font size
8159: * basesp (I) subraster * to character (or subexpression)
8160: * immediately preceding \rotatebox
8161: * (unused, but passed for consistency)
8162: * arg1 (I) int unused
8163: * arg2 (I) int unused
8164: * arg3 (I) int unused
8165: * --------------------------------------------------------------------------
8166: * Returns: ( subraster * ) ptr to subraster corresponding to \rotatebox
8167: * requested, or NULL for any parsing error
8168: * --------------------------------------------------------------------------
8169: * Notes: o Summary of syntax...
8170: * \rotatebox{degrees}{subexpression}
8171: * o
8172: * ======================================================================= */
8173: /* --- entry point --- */
8174: subraster *rastrotate ( char **expression, int size, subraster *basesp,
8175: int arg1, int arg2, int arg3 )
8176: {
8177: /* -------------------------------------------------------------------------
8178: Allocations and Declarations
8179: -------------------------------------------------------------------------- */
8180: char *texsubexpr(), subexpr[8192], *degexpr=subexpr; /* args */
8181: subraster *rasterize(), *rotsp=NULL; /* subraster for rotated subexpr */
8182: raster *rastrot(), *rotrp=NULL; /* rotate subraster->image 90 degs */
8183: int delete_raster(); /* delete intermediate rasters */
8184: int baseline=0; /* baseline of rasterized image */
8185: double strtod(), /* convert ascii params to doubles */
8186: degrees=0.0, ipart,fpart; /* degrees to be rotated */
8187: int idegrees=0, isneg=0; /* positive ipart, isneg=1 if neg */
8188: int n90=0, isn90=1; /* degrees is n90 multiples of 90 */
8189: /* -------------------------------------------------------------------------
8190: obtain {degrees} argument immediately following \rotatebox command
8191: -------------------------------------------------------------------------- */
8192: /* --- parse for {degrees} arg, and bump expression past it --- */
8193: *expression = texsubexpr(*expression,degexpr,0,"{","}",0,0);
8194: if ( *degexpr == '\000' ) goto end_of_job; /* couldn't get {degrees} */
8195: degrees = strtod(degexpr,NULL); /* degrees to be rotated */
8196: if ( degrees < 0.0 ) /* clockwise rotation desired */
8197: { degrees = -degrees; /* flip sign so degrees positive */
8198: isneg = 1; } /* and set flag to indicate flip */
8199: fpart = modf(degrees,&ipart); /* integer and fractional parts */
8200: ipart = (double)(((int)degrees)%360); /* degrees mod 360 */
8201: degrees = ipart + fpart; /* restore fractional part */
8202: if ( isneg ) /* if clockwise rotation requested */
8203: degrees = 360.0 - degrees; /* do equivalent counterclockwise */
8204: idegrees = (int)(degrees+0.5); /* integer degrees */
8205: n90 = idegrees/90; /* degrees is n90 multiples of 90 */
8206: isn90 = (90*n90==idegrees); /*true if degrees is multiple of 90*/
8207: isn90 = 1; /* forced true for time being */
8208: /* -------------------------------------------------------------------------
8209: obtain {subexpr} argument after {degrees}, and rasterize it
8210: -------------------------------------------------------------------------- */
8211: /* --- parse for {subexpr} arg, and bump expression past it --- */
8212: *expression = texsubexpr(*expression,subexpr,0,"{","}",0,0);
8213: /* --- rasterize subexpression to be rotated --- */
8214: if ( (rotsp = rasterize(subexpr,size)) /* rasterize subexpression */
8215: == NULL ) goto end_of_job; /* and quit if failed */
8216: /* --- return unmodified image if no rotation requested --- */
8217: if ( abs(idegrees) < 2 ) goto end_of_job; /* don't bother rotating image */
8218: /* --- extract params for image to be rotated --- */
8219: rotrp = rotsp->image; /* unrotated rasterized image */
8220: baseline = rotsp->baseline; /* and baseline of that image */
8221: /* -------------------------------------------------------------------------
8222: rotate by multiples of 90 degrees
8223: -------------------------------------------------------------------------- */
8224: if ( isn90 ) /* rotation by multiples of 90 */
8225: if ( n90 > 0 ) /* do nothing for 0 degrees */
8226: {
8227: n90 = 4-n90; /* rasrot() rotates clockwise */
8228: while ( n90 > 0 ) /* still have remaining rotations */
8229: { raster *nextrp = rastrot(rotrp); /* rotate raster image */
8230: if ( nextrp == NULL ) break; /* something's terribly wrong */
8231: delete_raster(rotrp); /* free previous raster image */
8232: rotrp = nextrp; /* and replace it with rotated one */
8233: n90--; } /* decrement remaining count */
8234: } /* --- end-of-if(isn90) --- */
8235: /* -------------------------------------------------------------------------
8236: requested rotation not multiple of 90 degrees
8237: -------------------------------------------------------------------------- */
8238: if ( !isn90 ) /* explicitly construct rotation */
8239: { ; } /* not yet implemented */
8240: /* -------------------------------------------------------------------------
8241: re-populate subraster envelope with rotated image
8242: -------------------------------------------------------------------------- */
8243: /* --- re-init various subraster parameters, embedding raster in it --- */
8244: if ( rotrp != NULL ) /* rotated raster constructed okay */
8245: { rotsp->type = IMAGERASTER; /* signal constructed image */
8246: rotsp->image = rotrp; /* raster we just constructed */
8247: /* --- now try to guess pleasing baseline --- */
8248: if ( idegrees > 2 ) /* leave unchanged if unrotated */
8249: if ( strlen(subexpr) < 3 /* we rotated a short expression */
8250: || abs(idegrees-180) < 3 ) /* or just turned it upside-down */
8251: baseline = rotrp->height - 1; /* so set with nothing descending */
8252: else /* rotated a long expression */
8253: baseline = (65*(rotrp->height-1))/100; /* roughly center long expr */
8254: rotsp->baseline = baseline; } /* set baseline as calculated above*/
8255: /* --- return rotated subexpr to caller --- */
8256: end_of_job:
8257: return ( rotsp ); /*return rotated subexpr to caller*/
8258: } /* --- end-of-function rastrotate() --- */
8259:
8260:
8261: /* ==========================================================================
8262: * Function: rastfbox ( expression, size, basesp, arg1, arg2, arg3 )
8263: * Purpose: \fbox{subexpression} handler, returns subraster
8264: * containing subexpression with frame box drawn around it
8265: * --------------------------------------------------------------------------
8266: * Arguments: expression (I/O) char ** to first char of null-terminated
8267: * string immediately following \fbox to be
8268: * rasterized, and returning ptr immediately
8269: * following last character processed.
8270: * size (I) int containing 0-5 default font size
8271: * basesp (I) subraster * to character (or subexpression)
8272: * immediately preceding \fbox
8273: * (unused, but passed for consistency)
8274: * arg1 (I) int unused
8275: * arg2 (I) int unused
8276: * arg3 (I) int unused
8277: * --------------------------------------------------------------------------
8278: * Returns: ( subraster * ) ptr to subraster corresponding to \fbox
8279: * requested, or NULL for any parsing error
8280: * --------------------------------------------------------------------------
8281: * Notes: o Summary of syntax...
8282: * \fbox[width][height]{subexpression}
8283: * o
8284: * ======================================================================= */
8285: /* --- entry point --- */
8286: subraster *rastfbox ( char **expression, int size, subraster *basesp,
8287: int arg1, int arg2, int arg3 )
8288: {
8289: /* -------------------------------------------------------------------------
8290: Allocations and Declarations
8291: -------------------------------------------------------------------------- */
8292: char *texsubexpr(), subexpr[8192], widtharg[512]; /* args */
8293: subraster *rasterize(), *framesp=NULL; /* rasterize subexpr to be framed */
8294: raster *border_raster(), *bp=NULL; /* framed image raster */
8295: double strtod(); /* interpret [width][height] */
8296: int fwidth=6, fthick=1; /*extra frame width, line thickness*/
8297: int width=(-1), height=(-1), /* optional [width][height] args */
8298: iscompose = 0; /* set true if optional args given */
8299: /* -------------------------------------------------------------------------
8300: obtain optional [width][height] arguments immediately following \fbox
8301: -------------------------------------------------------------------------- */
8302: /* --- first check for optional \fbox[width] --- */
8303: if ( *(*expression) == '[' ) /* check for []-enclosed width arg */
8304: { *expression = texsubexpr(*expression,widtharg,511,"[","]",0,0);
8305: if ( *widtharg != '\000' ) /* got widtharg */
8306: { width = max2(1,iround(unitlength*strtod(widtharg,NULL)));
8307: height = 1; fwidth = 2; iscompose = 1; }
8308: } /* --- end-of-if(**expression=='[') --- */
8309: if ( width > 0 ) /* found leading [width], so... */
8310: if ( *(*expression) == '[' ) /* check for []-enclosed height arg */
8311: { *expression = texsubexpr(*expression,widtharg,511,"[","]",0,0);
8312: if ( *widtharg != '\000' ) /* got widtharg */
8313: { height = max2(1,iround(unitlength*strtod(widtharg,NULL)));
8314: fwidth = 0; } /* no extra border */
8315: } /* --- end-of-if(**expression=='[') --- */
8316: /* -------------------------------------------------------------------------
8317: obtain {subexpr} argument
8318: -------------------------------------------------------------------------- */
8319: /* --- parse for {subexpr} arg, and bump expression past it --- */
8320: *expression = texsubexpr(*expression,subexpr,0,"{","}",0,0);
8321: /* --- rasterize subexpression to be framed --- */
8322: if ( width<0 || height<0 ) /* no explicit dimensions given */
8323: { if ( (framesp = rasterize(subexpr,size)) /* rasterize subexpression */
8324: == NULL ) goto end_of_job; } /* and quit if failed */
8325: else
8326: { char composexpr[8192]; /* compose subexpr with empty box */
8327: sprintf(composexpr,"\\compose{\\hspace{%d}\\vspace{%d}}{%s}",
8328: width,height,subexpr);
8329: if ( (framesp = rasterize(composexpr,size)) /* rasterize subexpression */
8330: == NULL ) goto end_of_job; } /* and quit if failed */
8331: /* -------------------------------------------------------------------------
8332: draw frame, reset params, and return it to caller
8333: -------------------------------------------------------------------------- */
8334: /* --- draw border --- */
8335: if ( (bp = border_raster(framesp->image,-fwidth,-fwidth,fthick,1))
8336: == NULL ) goto end_of_job; /* draw border and quit if failed */
8337: /* --- replace original image and raise baseline to accommodate frame --- */
8338: framesp->image = bp; /* replace image with framed one */
8339: if ( !iscompose ) /* simple border around subexpr */
8340: framesp->baseline += fwidth; /* so just raise baseline */
8341: else
8342: framesp->baseline = (framesp->image)->height - 1; /* set at bottom */
8343: /* --- return framed subexpr to caller --- */
8344: end_of_job:
8345: return ( framesp ); /* return framed subexpr to caller */
8346: } /* --- end-of-function rastfbox() --- */
8347:
8348:
8349: /* ==========================================================================
8350: * Function: rastinput ( expression, size, basesp, arg1, arg2, arg3 )
8351: * Purpose: \input{filename} handler, reads filename and returns
8352: * subraster containing image of expression read from filename
8353: * --------------------------------------------------------------------------
8354: * Arguments: expression (I/O) char ** to first char of null-terminated
8355: * string immediately following \input to be
8356: * rasterized, and returning ptr immediately
8357: * following last character processed.
8358: * size (I) int containing 0-5 default font size
8359: * basesp (I) subraster * to character (or subexpression)
8360: * immediately preceding \input
8361: * (unused, but passed for consistency)
8362: * arg1 (I) int unused
8363: * arg2 (I) int unused
8364: * arg3 (I) int unused
8365: * --------------------------------------------------------------------------
8366: * Returns: ( subraster * ) ptr to subraster corresponding to expression
8367: * in filename, or NULL for any parsing error
8368: * --------------------------------------------------------------------------
8369: * Notes: o Summary of syntax...
8370: * \input{filename}
8371: * o
8372: * ======================================================================= */
8373: /* --- entry point --- */
8374: subraster *rastinput ( char **expression, int size, subraster *basesp,
8375: int arg1, int arg2, int arg3 )
8376: {
8377: /* -------------------------------------------------------------------------
8378: Allocations and Declarations
8379: -------------------------------------------------------------------------- */
8380: char *texsubexpr(), tag[512]="\000", filename[1024]="\000"; /* args */
8381: subraster *rasterize(), *inputsp=NULL; /* rasterized input image */
8382: int status, rastreadfile(); /* read input file */
8383: int format=0, npts=0; /* don't reformat (numerical) input */
8384: char subexpr[8192], /* concatanated lines from input file */
8385: *mimeprep(), /* preprocess inputted data */
8386: *dtoa(), *reformat=NULL; /* reformat numerical input */
8387: /* -------------------------------------------------------------------------
8388: obtain [tag]{filename} argument
8389: -------------------------------------------------------------------------- */
8390: /* --- parse for optional [tag] or [fmt] arg, bump expression past it --- */
8391: if ( *(*expression) == '[' ) /* check for []-enclosed value */
8392: { char argfld[2048]; /* optional argument field */
8393: *expression = texsubexpr(*expression,argfld,2047,"[","]",0,0);
8394: if ( (reformat=strstr(argfld,"dtoa")) != NULL ) /* dtoa requested */
8395: { format = 1; /* signal dtoa() format */
8396: if ( (reformat=strchr(reformat,'=')) != NULL ) /* have dtoa= */
8397: npts = (int)strtol(reformat+1,NULL,0); } /* so set npts */
8398: if ( format == 0 ) /* reformat not requested */
8399: strcpy(tag,argfld); } /* so interpret arg as tag */
8400: /* --- parse for {filename} arg, and bump expression past it --- */
8401: *expression = texsubexpr(*expression,filename,1023,"{","}",0,0);
8402: /* --- check for alternate filename:tag --- */
8403: if ( *filename != '\000' /* got filename */
8404: /*&& *tag == '\000'*/ ) /* but no [tag] */
8405: { char *delim = strchr(filename,':'); /* look for : in filename:tag */
8406: if ( delim != (char *)NULL ) /* found it */
8407: { *delim = '\000'; /* null-terminate filename at : */
8408: strcpy(tag,delim+1); } } /* and stuff after : is tag */
8409: /* --------------------------------------------------------------------------
8410: Read file and rasterize constructed subexpression
8411: -------------------------------------------------------------------------- */
8412: status = rastreadfile(filename,tag,subexpr); /* read file */
8413: if ( *subexpr == '\000' ) goto end_of_job; /* quit if problem */
8414: /* --- rasterize input subexpression --- */
8415: mimeprep(subexpr); /* preprocess subexpression */
8416: if ( format == 1 ) /* dtoa() */
8417: { double d = strtod(subexpr,NULL); /* interpret subexpr as double */
8418: if ( d != 0.0 ) /* conversion to double successful */
8419: if ( (reformat=dtoa(d,npts)) != NULL ) /* reformat successful */
8420: strcpy(subexpr,reformat); } /*replace subexpr with reformatted*/
8421: inputsp = rasterize(subexpr,size); /* rasterize subexpression */
8422: /* --- return input image to caller --- */
8423: end_of_job:
8424: return ( inputsp ); /* return input image to caller */
8425: } /* --- end-of-function rastinput() --- */
8426:
8427:
8428: /* ==========================================================================
8429: * Function: rastcounter ( expression, size, basesp, arg1, arg2, arg3 )
8430: * Purpose: \counter[value]{filename} handler, returns subraster
8431: * containing image of counter value read from filename
8432: * (or optional [value]), and increments counter
8433: * --------------------------------------------------------------------------
8434: * Arguments: expression (I/O) char ** to first char of null-terminated
8435: * string immediately following \counter to be
8436: * rasterized, and returning ptr immediately
8437: * following last character processed.
8438: * size (I) int containing 0-5 default font size
8439: * basesp (I) subraster * to character (or subexpression)
8440: * immediately preceding \counter
8441: * (unused, but passed for consistency)
8442: * arg1 (I) int unused
8443: * arg2 (I) int unused
8444: * arg3 (I) int unused
8445: * --------------------------------------------------------------------------
8446: * Returns: ( subraster * ) ptr to subraster corresponding to \counter
8447: * requested, or NULL for any parsing error
8448: * --------------------------------------------------------------------------
8449: * Notes: o Summary of syntax...
8450: * \counter[value][logfile]{filename}
8451: * o
8452: * ======================================================================= */
8453: /* --- entry point --- */
8454: subraster *rastcounter ( char **expression, int size, subraster *basesp,
8455: int arg1, int arg2, int arg3 )
8456: {
8457: /* -------------------------------------------------------------------------
8458: Allocations and Declarations
8459: -------------------------------------------------------------------------- */
8460: char *texsubexpr(), filename[1024]="\000", /* counter file */
8461: logfile[1024]="\000", tag[512]="\000"; /* log file and tag */
8462: subraster *rasterize(), *countersp=NULL; /* rasterized counter image */
8463: FILE /* *fp=NULL,*/ *logfp=NULL; /* counter and log file pointers */
8464: int rastreadfile(), rastwritefile(); /* to read and write counter file */
8465: char text[2048] = "1_", /* first (and only) line in counter file */
8466: *delim = NULL, /* delimiter in text */
8467: utext[32] = "1_", /* default delimiter */
8468: *udelim = utext+1; /* underscore delimiter */
8469: char *timestamp(), /* timestamp for logging */
8470: *dtoa(); /* double to comma-separated */
8471: int counter = 1, /* atoi(text) (after _ removed, if present) */
8472: gotcount = 0, /* set true once counter value determined */
8473: ordindex = (-1); /* ordinal[] index to append ordinal suffix */
8474: /*--- ordinal suffixes based on units digit of counter ---*/
8475: static char *ordinal[]={"th","st","nd","rd","th","th","th","th","th","th"};
8476: static char *logvars[]={"REMOTE_ADDR","HTTP_REFERER",NULL}; /* log vars*/
8477: static int commentvar = 1; /* logvars[commentvar] replaced by comment */
8478: /* -------------------------------------------------------------------------
8479: first obtain optional [value][logfile] args immediately following \counter
8480: -------------------------------------------------------------------------- */
8481: /* --- first check for optional \counter[value] --- */
8482: if ( *(*expression) == '[' ) /* check for []-enclosed value */
8483: { *expression = texsubexpr(*expression,text,2047,"[","]",0,0);
8484: if ( *text != '\000' ) /* got counter value */
8485: if ( strlen(text) >= 1 ) /* and it's not an empty string */
8486: if ( isdigit((int)(*text)) ) /* leading 0-9 digit signals value */
8487: { counter = (int)(strtod(text,&udelim)+0.1); /* value and delim */
8488: gotcount = 1; } /* signal we got counter value */
8489: else /* not a digit, so must be logfile */
8490: strcpy(logfile,text); /* so just copy it */
8491: } /* --- end-of-if(**expression=='[') --- */
8492: /* --- next check for optional \counter[][logfile] --- */
8493: if ( *(*expression) == '[' ) /* check for []-enclosed logfile */
8494: { *expression = texsubexpr(*expression,filename,1023,"[","]",0,0);
8495: if ( *text != '\000' ) /* got logfile value */
8496: if ( strlen(filename) >= 1 ) /* and it's not an empty string */
8497: if ( !(isdigit((int)(*filename))) /*leading non-digit signals logfile*/
8498: || gotcount ) /* or we already got counter value */
8499: strcpy(logfile,filename); /* so just copy it */
8500: else /* 0-9 digit, so must be value */
8501: { strcpy(text,filename); /* copy value to text line */
8502: counter = (int)(strtod(text,&udelim)+0.1); /* value and delim */
8503: gotcount = 1; } /* signal we got counter value */
8504: } /* --- end-of-if(**expression=='[') --- */
8505: /* -------------------------------------------------------------------------
8506: obtain counter {filename} argument
8507: -------------------------------------------------------------------------- */
8508: /* --- parse for {filename} arg, and bump expression past it --- */
8509: *expression = texsubexpr(*expression,filename,1023,"{","}",0,0);
8510: /* --- check for counter filename:tag --- */
8511: if ( *filename != '\000' ) /* got filename */
8512: if ( (delim=strchr(filename,':')) /* look for : in filename:tag */
8513: != (char *)NULL ) /* found it */
8514: { *delim = '\000'; /* null-terminate filename at : */
8515: strcpy(tag,delim+1); } /* and stuff after : is tag */
8516: /* --------------------------------------------------------------------------
8517: Read and parse file, increment and rewrite counter (with optional underscore)
8518: -------------------------------------------------------------------------- */
8519: if ( strlen(filename) > 1 ) /* make sure we got {filename} arg */
8520: {
8521: /* --- read and interpret first (and only) line from counter file --- */
8522: if ( !gotcount ) /* if no [count] argument supplied */
8523: if ( rastreadfile(filename,tag,text) != 0 ) /* try reading it from file */
8524: { counter= 1 + (int)(strtod(text,&udelim)+0.1); /*counter val and delim*/
8525: gotcount = 1; } /* signal we got counter value */
8526: /* --- check for ordinal suffix --- */
8527: if ( udelim != (char *)NULL ) /* have some delim after value */
8528: if ( *udelim == '_' ) /* underscore signals ordinal */
8529: { ordindex = counter%10; /* least significant digit */
8530: if ( counter >= 10 ) /* counter is 10 or greater */
8531: if ( (counter/10)%10 == 1 ) /* and the last two are 10-19 */
8532: ordindex = 0; } /* use th for 11,12,13 rather than st,nd,rd */
8533: /* --- rewrite counter file --- */
8534: sprintf(text,"%d",counter); /*build image of incremented counter*/
8535: if ( ordindex >= 0 ) strcat(text,"_"); /* tack on _ */
8536: if ( *tag == '\000' ) strcat(text,"\n"); /* and newline */
8537: rastwritefile(filename,tag,text,1); /* rewrite incremented counter */
8538: } /* --- end-of-if(strlen(filename)>1) --- */
8539: /* --------------------------------------------------------------------------
8540: log counter request
8541: -------------------------------------------------------------------------- */
8542: if ( strlen(logfile) > 1 ) /* optional [logfile] given */
8543: {
8544: char comment[1024] = "\000", /* embedded comment, logfile:comment*/
8545: *commptr = strchr(logfile,':'); /* check for : signalling comment */
8546: if ( commptr != NULL ) /* have embedded comment */
8547: { strcpy(comment,commptr+1); /* comment follows : */
8548: *commptr = '\000'; } /* null-terminate actual logfile */
8549: if ( (logfp = fopen(logfile,"a")) /* open logfile */
8550: != (FILE *)NULL ) /* opened successfully */
8551: {
8552: int ilog=0; /* logvars[] index */
8553: fprintf(logfp,"%s ",timestamp()); /* first emit timestamp */
8554: if (*tag=='\000') fprintf(logfp,"%s",filename); /* emit counter filename */
8555: else fprintf(logfp,"<%s>",tag); /* or tag if we have one */
8556: fprintf(logfp,"=%d",counter); /* emit counter value */
8557: for ( ilog=0; logvars[ilog] != NULL; ilog++ ) /* log till end-of-table */
8558: if ( ilog == commentvar /* replace with comment... */
8559: && commptr != NULL ) /* ...if available */
8560: fprintf(logfp," %.256s",comment); /* log embedded comment */
8561: else
8562: { char *logval = getenv(logvars[ilog]); /* getenv(variable) to be logged*/
8563: fprintf(logfp," %.64s", /* log variable */
8564: (logval!=NULL?logval:"<unknown>")); } /* emit value or <unknown> */
8565: fprintf(logfp,"\n"); /* terminating newline */
8566: fclose(logfp); /* close logfile */
8567: } /* --- end-of-if(logfp!=NULL) --- */
8568: } /* --- end-of-if(strlen(logfile)>1) --- */
8569: /* --------------------------------------------------------------------------
8570: construct counter expression and rasterize it
8571: -------------------------------------------------------------------------- */
8572: /* --- construct expression --- */
8573: /*sprintf(text,"%d",counter);*/ /* start with counter */
8574: strcpy(text,dtoa(((double)counter),0)); /* comma-separated counter value */
8575: if ( ordindex >= 0 ) /* need to tack on ordinal suffix */
8576: { strcat(text,"^{\\underline{\\rm~"); /* start with ^ and {\underline{\rm */
8577: strcat(text,ordinal[ordindex]); /* then st,nd,rd, or th */
8578: strcat(text,"}}"); } /* finish with }} */
8579: /* --- rasterize it --- */
8580: countersp = rasterize(text,size); /* rasterize counter subexpression */
8581: /* --- return counter image to caller --- */
8582: /*end_of_job:*/
8583: return ( countersp ); /* return counter image to caller */
8584: } /* --- end-of-function rastcounter() --- */
8585:
8586:
8587: /* ==========================================================================
8588: * Function: rastnoop ( expression, size, basesp, nargs, arg2, arg3 )
8589: * Purpose: no op -- flush \escape without error
8590: * --------------------------------------------------------------------------
8591: * Arguments: expression (I/O) char ** to first char of null-terminated
8592: * string immediately following \escape to be
8593: * flushed, and returning ptr immediately
8594: * following last character processed.
8595: * size (I) int containing 0-5 default font size
8596: * basesp (I) subraster * to character (or subexpression)
8597: * immediately preceding \fbox
8598: * (unused, but passed for consistency)
8599: * nargs (I) int containing number of {}-args after
8600: * \escape to be flushed along with it
8601: * arg2 (I) int unused
8602: * arg3 (I) int unused
8603: * --------------------------------------------------------------------------
8604: * Returns: ( subraster * ) NULL subraster ptr
8605: * --------------------------------------------------------------------------
8606: * Notes: o
8607: * ======================================================================= */
8608: /* --- entry point --- */
8609: subraster *rastnoop ( char **expression, int size, subraster *basesp,
8610: int nargs, int arg2, int arg3 )
8611: {
8612: /* -------------------------------------------------------------------------
8613: Allocations and Declarations
8614: -------------------------------------------------------------------------- */
8615: char *texsubexpr(), subexpr[8192]; /* flush dummy args eaten by \escape*/
8616: subraster *rasterize(), *noopsp=NULL; /* rasterize subexpr */
8617: /* --- flush accompanying args if necessary --- */
8618: if ( nargs != NOVALUE /* not unspecified */
8619: && nargs > 0 ) /* and args to be flushed */
8620: while ( --nargs >= 0 ) /* count down */
8621: *expression = texsubexpr(*expression,subexpr,0,"{","}",0,0); /*flush arg*/
8622: /* --- return null ptr to caller --- */
8623: /*end_of_job:*/
8624: return ( noopsp ); /* return NULL ptr to caller */
8625: } /* --- end-of-function rastnoop() --- */
8626:
8627:
8628: /* ==========================================================================
8629: * Function: rastopenfile ( filename, mode )
8630: * Purpose: Opens filename[.tex] in mode, returning FILE *
8631: * --------------------------------------------------------------------------
8632: * Arguments: filename (I/O) char * to null-terminated string containing
8633: * name of file to open (preceded by path
8634: * relative to mimetex executable)
8635: * If fopen() fails, .tex appeneded,
8636: * and returned if that fopen() succeeds
8637: * mode (I) char * to null-terminated string containing
8638: * fopen() mode
8639: * --------------------------------------------------------------------------
8640: * Returns: ( FILE * ) pointer to opened file, or NULL if error
8641: * --------------------------------------------------------------------------
8642: * Notes: o
8643: * ======================================================================= */
8644: /* --- entry point --- */
8645: FILE *rastopenfile ( char *filename, char *mode )
8646: {
8647: /* -------------------------------------------------------------------------
8648: Allocations and Declarations
8649: -------------------------------------------------------------------------- */
8650: FILE *fp = (FILE *)NULL /*,*fopen()*/; /*file pointer to opened filename*/
8651: char texfile[2048] = "\000", /* local copy of input filename */
8652: amode[128] = "r"; /* test open mode if arg mode=NULL */
8653: int ismode = 0, /* true of mode!=NULL */
8654: isprefix = (*pathprefix=='\000'?0:1); /* true if paths have prefix */
8655: /* --------------------------------------------------------------------------
8656: Check mode and open file
8657: -------------------------------------------------------------------------- */
8658: /* --- check filename --- */
8659: if ( filename != (char *)NULL ) /* caller passed filename arg */
8660: if ( strlen(filename) >= 1 ) /* make sure we got actual filename*/
8661: { char *pfilename = filename; /* ptr to 1st char of filename */
8662: *texfile = '\000'; /* init filename as null string */
8663: while ( isthischar(*pfilename," /\\") ) /* absolute paths invalid */
8664: pfilename++; /* so flush leading / or \ (or ' ')*/
8665: if ( isprefix && *pfilename!='\000' ) /* paths preceded by prefix */
8666: { strcat(texfile,pathprefix); /* init filename with path */
8667: while ( memcmp(pfilename,"../",3)==0 /* have leading ../ */
8668: || memcmp(pfilename,"..\\",3)==0 ) /* or ..\ with prefix */
8669: pfilename += 3; } /* flush leading ../ or ..\ */
8670: strcat(texfile,pfilename); /* local copy of given filename */
8671: compress(texfile,' '); } /* remove embedded blanks */
8672: /* --- check mode --- */
8673: if ( mode != (char *)NULL ) /* caller passed mode arg */
8674: if ( *mode != '\000' ) /* and it's not an empty string */
8675: { ismode = 1; /* so flip mode flag true */
8676: strcpy(amode,mode); /* and replace "r" with caller's */
8677: compress(amode,' '); } /* remove embedded blanks */
8678: /* --- open filename or filename.tex --- */
8679: if ( strlen(texfile) > 1 ) /* make sure we got actual filename*/
8680: if ( (fp = fopen(texfile,amode)) /* try opening given filename */
8681: == NULL ) /* failed to open given filename */
8682: { strcpy(filename,texfile); /* signal possible filename error */
8683: strcat(texfile,".tex"); /* but first try adding .tex */
8684: if ( (fp = fopen(texfile,amode)) /* now try opening filename.tex */
8685: != NULL ) /* filename.tex succeeded */
8686: strcpy(filename,texfile); } /* replace caller's filename */
8687: /* --- close file if only opened to check name --- */
8688: if ( !ismode && fp!=NULL ) /* no mode, so just checking */
8689: fclose(fp); /* close file, fp signals success */
8690: /* --- return fp or NULL to caller --- */
8691: /*end_of_job:*/
8692: if ( msglevel>=9 && msgfp!=NULL ) /* debuging */
8693: { fprintf(msgfp,"rastopenfile> returning fopen(%s,%s) = %s\n",
8694: filename,amode,(fp==NULL?"NULL":"Okay")); fflush(msgfp); }
8695: return ( fp ); /* return fp or NULL to caller */
8696: } /* --- end-of-function rastopenfile() --- */
8697:
8698:
8699: /* ==========================================================================
8700: * Function: rastreadfile ( filename, tag, value )
8701: * Purpose: Read filename, returning value as string
8702: * between <tag>...</tag> or entire file if tag=NULL passed.
8703: * --------------------------------------------------------------------------
8704: * Arguments: filename (I) char * to null-terminated string containing
8705: * name of file to read (preceded by path
8706: * relative to mimetex executable)
8707: * tag (I) char * to null-terminated string containing
8708: * html-like tagname. File contents between
8709: * <tag> and </tag> will be returned, or
8710: * entire file if tag=NULL passed.
8711: * value (O) char * returning value between <tag>...</tag>
8712: * or entire file if tag=NULL.
8713: * --------------------------------------------------------------------------
8714: * Returns: ( int ) 1=okay, 0=some error
8715: * --------------------------------------------------------------------------
8716: * Notes: o
8717: * ======================================================================= */
8718: /* --- entry point --- */
8719: int rastreadfile ( char *filename, char *tag, char *value )
8720: {
8721: /* -------------------------------------------------------------------------
8722: Allocations and Declarations
8723: -------------------------------------------------------------------------- */
8724: FILE *fp = (FILE *)NULL, *rastopenfile(); /* pointer to opened filename */
8725: char texfile[2048] = "\000", /* local copy of input filename */
8726: text[4096]; /* line from input file */
8727: char *tagp, tag1[512], tag2[512]; /* left <tag> and right <tag/> */
8728: int vallen=0, maxvallen=8000; /* #chars in value, max allowed */
8729: int status = 0; /* status returned, 1=okay */
8730: int tagnum = 0; /* tag we're looking for */
8731: /* --------------------------------------------------------------------------
8732: Open file
8733: -------------------------------------------------------------------------- */
8734: /* --- first check output arg --- */
8735: if ( value == (char *)NULL ) goto end_of_job; /* no output buffer supplied */
8736: *value = '\000'; /* init buffer with empty string */
8737: /* --- open filename or filename.tex --- */
8738: if ( filename != (char *)NULL ) /* make sure we got filename arg */
8739: { strcpy(texfile,filename); /* local copy of filename */
8740: fp = rastopenfile(texfile,"r"); } /* try opening it */
8741: /* --- check that file opened --- */
8742: if ( fp == (FILE *)NULL ) /* failed to open file */
8743: { sprintf(value,"{\\normalsize\\rm[file %s?]}",texfile);
8744: goto end_of_job; } /* return error message to caller */
8745: /* --------------------------------------------------------------------------
8746: construct <tag>'s
8747: -------------------------------------------------------------------------- */
8748: if ( tag != (char *)NULL ) /* caller passed tag arg */
8749: if ( *tag != '\000' ) /* and it's not an empty string */
8750: { strcpy(tag1,"<"); strcpy(tag2,"</"); /* begin with < and </ */
8751: strcat(tag1,tag); strcat(tag2,tag); /* followed by caller's tag */
8752: strcat(tag1,">"); strcat(tag2,">"); /* ending both tags with > */
8753: compress(tag1,' '); compress(tag2,' '); /* remove embedded blanks */
8754: tagnum = 1; } /* signal that we have tag */
8755: /* --------------------------------------------------------------------------
8756: Read file, concatnate lines
8757: -------------------------------------------------------------------------- */
8758: while ( fgets(text,4090,fp) != (char *)NULL ) { /* read input till eof */
8759: switch ( tagnum ) { /* look for left- or right-tag */
8760: case 0: break; /* no tag to look for */
8761: case 1: /* looking for opening left <tag> */
8762: if ( (tagp=strstr(text,tag1)) == NULL ) break; /*haven't found it yet*/
8763: strcpy(text,tagp+strlen(tag1)); /* shift out preceding text */
8764: tagnum = 2; /*now looking for closing right tag*/
8765: case 2: /* looking for closing right </tag> */
8766: if ( (tagp=strstr(text,tag2)) == NULL ) break; /*haven't found it yet*/
8767: *tagp = '\000'; /* terminate line at tag */
8768: tagnum = 3; /* done after this line */
8769: break;
8770: } /* ---end-of-switch(tagnum) --- */
8771: if ( tagnum != 1 ) { /* no tag or left tag already found*/
8772: int textlen = strlen(text); /* #chars in current line */
8773: if ( vallen+textlen > maxvallen ) break; /* quit before overflow */
8774: strcat(value,text); /* concat line to end of value */
8775: vallen += textlen; /* bump length */
8776: if ( tagnum > 2 ) break; } /* found right tag, so we're done */
8777: } /* --- end-of-while(fgets()!=NULL) --- */
8778: if ( tagnum<1 || tagnum>2 ) status=1; /* okay if no tag or we found tag */
8779: fclose ( fp ); /* close input file after reading */
8780: /* --- return value and status to caller --- */
8781: end_of_job:
8782: return ( status ); /* return status to caller */
8783: } /* --- end-of-function rastreadfile() --- */
8784:
8785:
8786: /* ==========================================================================
8787: * Function: rastwritefile ( filename, tag, value, isstrict )
8788: * Purpose: Re/writes filename, replacing string between <tag>...</tag>
8789: * with value, or writing entire file as value if tag=NULL.
8790: * --------------------------------------------------------------------------
8791: * Arguments: filename (I) char * to null-terminated string containing
8792: * name of file to write (preceded by path
8793: * relative to mimetex executable)
8794: * tag (I) char * to null-terminated string containing
8795: * html-like tagname. File contents between
8796: * <tag> and </tag> will be replaced, or
8797: * entire file written if tag=NULL passed.
8798: * value (I) char * containing string replacing value
8799: * between <tag>...</tag> or replacing entire
8800: * file if tag=NULL.
8801: * isstrict (I) int containing 1 to only rewrite existing
8802: * files, or 0 to create new file if necessary.
8803: * --------------------------------------------------------------------------
8804: * Returns: ( int ) 1=okay, 0=some error
8805: * --------------------------------------------------------------------------
8806: * Notes: o
8807: * ======================================================================= */
8808: /* --- entry point --- */
8809: int rastwritefile( char *filename, char *tag, char *value, int isstrict )
8810: {
8811: /* -------------------------------------------------------------------------
8812: Allocations and Declarations
8813: -------------------------------------------------------------------------- */
8814: FILE *fp = (FILE *)NULL, *rastopenfile(); /* pointer to opened filename */
8815: char texfile[2048] = "\000", /* local copy of input filename */
8816: filebuff[16384] = "\000", /* entire contents of file */
8817: tag1[512], tag2[512], /* left <tag> and right <tag/> */
8818: *strchange(), /* put value between <tag>...</tag>*/
8819: *timestamp(); /* log modification time */
8820: int istag=0, rastreadfile(), /* read file if tag!=NULL */
8821: /*isstrict = (seclevel>5? 1:0),*/ /*true only writes existing files*/
8822: isnewfile = 0, /* true if writing new file */
8823: status = 0; /* status returned, 1=okay */
8824: /* --------------------------------------------------------------------------
8825: check args
8826: -------------------------------------------------------------------------- */
8827: /* --- check filename and value --- */
8828: if ( filename == (char *)NULL /* quit if no filename arg supplied*/
8829: || value == (char *)NULL ) goto end_of_job; /* or no value arg supplied */
8830: if ( strlen(filename) < 2 /* quit if unreasonable filename */
8831: || *value == '\000' ) goto end_of_job; /* or empty value string supplied */
8832: /* --- establish filename[.tex] --- */
8833: strcpy(texfile,filename); /* local copy of input filename */
8834: if ( rastopenfile(texfile,NULL) /* unchanged or .tex appended */
8835: == (FILE *)NULL ) /* can't open, so write new file */
8836: { if ( isstrict ) goto end_of_job; /* fail if new files not permitted */
8837: isnewfile = 1; } /* signal we're writing new file */
8838: /* --- check whether tag supplied by caller --- */
8839: if ( tag != (char *)NULL ) /* caller passed tag argument */
8840: if ( *tag != '\000' ) /* and it's not an empty string */
8841: { istag = 1; /* so flip tag flag true */
8842: strcpy(tag1,"<"); strcpy(tag2,"</"); /* begin tags with < and </ */
8843: strcat(tag1,tag); strcat(tag2,tag); /* followed by caller's tag */
8844: strcat(tag1,">"); strcat(tag2,">"); /* ending both tags with > */
8845: compress(tag1,' '); compress(tag2,' '); } /* remove embedded blanks */
8846: /* --------------------------------------------------------------------------
8847: read existing file if just rewriting a single tag
8848: -------------------------------------------------------------------------- */
8849: /* --- read original file if only replacing a tag within it --- */
8850: *filebuff = '\000'; /* init as empty file */
8851: if ( !isnewfile ) /* if file already exists */
8852: if ( istag ) /* and just rewriting one tag */
8853: if ( rastreadfile(texfile,NULL,filebuff) /* read entire existing file */
8854: == 0 ) goto end_of_job; /* signal error if failed to read */
8855: /* --------------------------------------------------------------------------
8856: construct new file data if needed (entire file replaced by value if no tag)
8857: -------------------------------------------------------------------------- */
8858: if ( istag ) /* only replacing tag in file */
8859: {
8860: /* --- find <tag> and </tag> in file --- */
8861: int tlen1=strlen(tag1), tlen2=strlen(tag2), flen; /*tag,buff lengths*/
8862: char *tagp1 = (isnewfile? NULL:strstr(filebuff,tag1)), /* <tag> in file*/
8863: *tagp2 = (isnewfile? NULL:strstr(filebuff,tag2)); /*</tag> in file*/
8864: /* --- if adding new <tag> just concatanate at end of file --- */
8865: if ( tagp1 == (char *)NULL ) /* add new tag to file */
8866: {
8867: /* --- preprocess filebuff --- */
8868: if ( tagp2 != (char *)NULL ) /* apparently have ...</tag> */
8869: strcpy(filebuff,tagp2+tlen2); /* so get rid of leading ...</tag> */
8870: if ( (flen = strlen(filebuff)) /* #chars currently in buffer */
8871: > 0 ) /* we have non-empty buffer */
8872: if (!isthischar(*(filebuff+flen-1),"\n\r")) /*no newline at end of file*/
8873: if(0)strcat(filebuff,"\n"); /* so add one before new tag */
8874: /* --- add new tag --- */
8875: strcat(filebuff,tag1); /* add opening <tag> */
8876: strcat(filebuff,value); /* then value */
8877: strcat(filebuff,tag2); /* finally closing </tag> */
8878: strcat(filebuff,"\n"); /* newline at end of file */
8879: } /* --- end-of-if(tagp1==NULL) --- */
8880: else /* found existing opening <tag> */
8881: {
8882: if ( tagp2 == NULL ) /* apparently have <tag>... */
8883: { *(tagp1+tlen1) = '\000'; /* so get rid of trailing ... */
8884: strcat(filebuff,value); /* then concatanate value */
8885: strcat(filebuff,tag2); } /* and finally closing </tag> */
8886: else /* else have <tag>...<tag/> */
8887: if ( (flen=((int)(tagp2-tagp1))-tlen1) /* len of .'s in <tag>...</tag> */
8888: >= 0 ) /* usually <tag> precedes </tag> */
8889: strchange(flen,tagp1+tlen1,value); /* change ...'s to value */
8890: else /* weirdly, </tag> precedes <tag> */
8891: { char fbuff[2048]; /* field buff for <tag>value</tag> */
8892: if ( (flen = ((int)(tagp1-tagp2))+tlen1) /* strlen(</tag>...<tag>) */
8893: <= 0 ) goto end_of_job; /* must be internal error */
8894: strcpy(fbuff,tag1); /* set opening <tag> */
8895: strcat(fbuff,value); /* then value */
8896: strcat(fbuff,tag2); /* finally closing </tag> */
8897: strchange(flen,tagp2,fbuff); } /* replace original </tag>...<tag> */
8898: } /* --- end-of-if/else(tagp1==NULL) --- */
8899: } /* --- end-of-if(istag) --- */
8900: /* --------------------------------------------------------------------------
8901: rewrite file and return to caller
8902: -------------------------------------------------------------------------- */
8903: /* --- first open file for write --- */
8904: if ( (fp=rastopenfile(texfile,"w")) /* open for write */
8905: == (FILE *)NULL ) goto end_of_job; /* signal error if can't open */
8906: /* --- rewrite and close file --- */
8907: if ( fputs((istag?filebuff:value),fp) /* write filebuff or value */
8908: != EOF ) status = 1; /* signal success if succeeded */
8909: fclose ( fp ); /* close output file after writing */
8910: /* --- modify timestamp --- */
8911: if ( istag ) /* log mod time in tagged file */
8912: if ( strstr(tag,"timestamp") == (char *)NULL ) /* but avoid recursion */
8913: { char fbuff[2048]; /* field buff <timestamp> value */
8914: strcpy(fbuff,tag); /* tag modified */
8915: strcat(fbuff," modified at "); /* spacer */
8916: strcat(fbuff,timestamp()); /* start with timestamp */
8917: rastwritefile(filename,"timestamp",fbuff,1); }
8918: /* --- return status to caller --- */
8919: end_of_job:
8920: return ( status ); /* return status to caller */
8921: } /* --- end-of-function rastwritefile() --- */
8922:
8923:
8924: /* ==========================================================================
8925: * Function: timestamp ( )
8926: * Purpose: returns null-terminated character string containing
8927: * current date:time stamp as ccyy-mm-dd:hh:mm:ss{am,pm}
8928: * --------------------------------------------------------------------------
8929: * Arguments: ( none )
8930: * --------------------------------------------------------------------------
8931: * Returns: ( char * ) ptr to null-terminated buffer
8932: * containing current date:time stamp
8933: * --------------------------------------------------------------------------
8934: * Notes: o
8935: * ======================================================================= */
8936: /* --- entry point --- */
8937: char *timestamp( )
8938: {
8939: /* -------------------------------------------------------------------------
8940: Allocations and Declarations
8941: -------------------------------------------------------------------------- */
8942: static char timebuff[64]; /* date:time buffer back to caller */
8943: /*long time_val = 0L;*/ /* binary value returned by time() */
8944: time_t time_val = (time_t)(0); /* binary value returned by time() */
8945: struct tm *tmstruct=(struct tm *)NULL, *localtime(); /* interpret time_val */
8946: int year=0, hour=0,ispm=1; /* adjust year, and set am/pm hour */
8947: /* -------------------------------------------------------------------------
8948: get current date:time, adjust values, and and format stamp
8949: -------------------------------------------------------------------------- */
8950: /* --- get current date:time --- */
8951: time((time_t *)(&time_val)); /* get date and time */
8952: tmstruct = localtime((time_t *)(&time_val)); /* interpret time_val */
8953: /* --- adjust year and hour as necessary --- */
8954: year = (int)(tmstruct->tm_year); /* local copy of year */
8955: hour = (int)(tmstruct->tm_hour); /* local copy of hour */
8956: year += 1900; /* set century in year */
8957: if ( hour < 12 ) /* am check */
8958: { ispm=0; /* reset pm flag */
8959: if ( hour == 0 ) hour = 12; } /* set 00hrs = 12am */
8960: if ( hour > 12 ) hour -= 12; /* pm check sets 13hrs to 1pm, etc */
8961: /* --- format date:time stamp --- */
8962: sprintf(timebuff,"%04d-%02d-%02d:%02d:%02d:%02d%s",
8963: year,(int)((tmstruct->tm_mon)+1),(int)(tmstruct->tm_mday),
8964: hour,(int)(tmstruct->tm_min),(int)(tmstruct->tm_sec),((ispm)?"pm":"am"));
8965: return ( timebuff ); /* return stamp to caller */
8966: } /* --- end-of-function timestamp() --- */
8967:
8968:
8969: /* ==========================================================================
8970: * Function: dtoa ( dblval, npts )
8971: * Purpose: Converts double to ascii, in financial format
8972: * (e.g., comma-separated and negatives enclosed in ()'s).
8973: * -------------------------------------------------------------------------
8974: * Arguments: dblval (I) double containing value to be converted.
8975: * npts (I) int containing #places after decimal point
8976: * to be displayed in returned string.
8977: * Returns: ( char * ) null-terminated string containing
8978: * double converted to financial format.
8979: * -------------------------------------------------------------------------
8980: * Notes: o
8981: * ======================================================================= */
8982: /* --- entry point --- */
8983: char *dtoa ( dblval, npts )
8984: double dblval;
8985: int npts;
8986: {
8987: /* -------------------------------------------------------------------------
8988: Allocations and Declarations
8989: ------------------------------------------------------------------------- */
8990: static char finval[128]; /* buffer returned to caller */
8991: static char digittbl[32]="0123456789*"; /* table of ascii decimal digits */
8992: char *finptr = finval; /* ptr to next char being converted*/
8993: double floor(); /* integer which is glb(double) */
8994: double dbldigit; /* to shift out digits from dblval */
8995: int digit; /* one digit from dblval */
8996: int isneg = 0; /* reset true if dblval negative */
8997: int ifrac = 0; /* npts fractional digits of dblval*/
8998: char digits[64]; int ndigits=0; /* all the digits [0]=least signif */
8999: /* -------------------------------------------------------------------------
9000: Check sign
9001: ------------------------------------------------------------------------- */
9002: if ( dblval < 0.0 ) /* got a negative value to convert */
9003: { isneg=1; dblval=(-dblval); } /* set flag and make it positive */
9004: /* -------------------------------------------------------------------------
9005: Get fractional part of dblval if required
9006: ------------------------------------------------------------------------- */
9007: if ( npts > 0 )
9008: { int ipts = npts; /* loop index */
9009: dbldigit = dblval-floor(dblval); /* fractional part as double */
9010: digit = 1; /* check if rounded frac > 1 */
9011: while ( --ipts >= 0 ) /* count down */
9012: { dbldigit *= 10.0; /* shift left one digit at a time */
9013: digit *= 10; } /* and keep max up-to-date */
9014: ifrac = (int)(dbldigit + 0.5); /* store fractional part as integer*/
9015: if ( ifrac >= digit ) /* round to next whole number */
9016: { dblval++; ifrac=0; } /* bump val, reset frac to zero */
9017: } /* --- end-of-if(npts>0) --- */
9018: else dblval += 0.5; /* no frac, round to nearest whole */
9019: /* -------------------------------------------------------------------------
9020: Get whole digits
9021: ------------------------------------------------------------------------- */
9022: dblval = floor(dblval); /* get rid of fractional part */
9023: while ( dblval > 0.0 ) /* still have data digits remaining*/
9024: { dbldigit = floor(dblval/10.0); /* shift out next digit */
9025: digit = (int)(dblval - 10.0*dbldigit + 0.01); /* least signif digit */
9026: if ( digit<0 || digit>9 ) digit=10; /* index check */
9027: digits[ndigits++] = digittbl[digit]; /* store ascii digit */
9028: dblval = dbldigit; } /* ready for next digit */
9029: if ( ndigits < 1 ) digits[ndigits++] = '0'; /* store a single '0' for 0.0 */
9030: /* -------------------------------------------------------------------------
9031: Format whole part from digits[] array
9032: ------------------------------------------------------------------------- */
9033: if ( isneg ) *finptr++ = '('; /* leading paren for negative value*/
9034: for ( digit=ndigits-1; digit>=0; digit-- ) /* start with most significant */
9035: { *finptr++ = digits[digit]; /* store digit */
9036: if ( digit>0 && digit%3==0 ) /* need a comma */
9037: *finptr++ = ','; } /* put in separating comma */
9038: /* -------------------------------------------------------------------------
9039: Format fractional part using ifrac
9040: ------------------------------------------------------------------------- */
9041: if ( npts > 0 )
9042: { *finptr++ = '.'; /* start with decimal point */
9043: sprintf(finptr,"%0*d",npts,ifrac); /* convert to string */
9044: finptr += npts; } /* bump ptr past fractional digits */
9045: /* -------------------------------------------------------------------------
9046: End-of-Job
9047: ------------------------------------------------------------------------- */
9048: if ( isneg ) *finptr++ = ')'; /*trailing paren for negative value*/
9049: *finptr = '\000'; /* null-terminate converted double */
9050: return ( finval ); /* converted double back to caller */
9051: } /* --- end-of-function dtoa() --- */
9052:
9053:
9054: /* ==========================================================================
9055: * Function: aalowpass ( rp, bytemap, grayscale )
9056: * Purpose: calculates a lowpass anti-aliased bytemap
9057: * for rp->bitmap, with each byte 0...grayscale-1
9058: * --------------------------------------------------------------------------
9059: * Arguments: rp (I) raster * to raster whose bitmap
9060: * is to be anti-aliased
9061: * bytemap (O) intbyte * to bytemap, calculated
9062: * by applying lowpass filter to rp->bitmap,
9063: * and returned (as you'd expect) in 1-to-1
9064: * addressing correspondence with rp->bitmap
9065: * grayscale (I) int containing number of grayscales
9066: * to be calculated, 0...grayscale-1
9067: * (should typically be given as 256)
9068: * --------------------------------------------------------------------------
9069: * Returns: ( int ) 1=success, 0=any error
9070: * --------------------------------------------------------------------------
9071: * Notes: o If the center point of the box being averaged is black,
9072: * then the entire "average" is forced black (grayscale-1)
9073: * regardless of the surrounding points. This is my attempt
9074: * to avoid a "washed-out" appearance of thin (one-pixel-wide)
9075: * lines, which would otherwise turn from black to a gray shade.
9076: * o Also, while the weights for neighbor points are fixed,
9077: * you may adjust the center point weight on the compile line.
9078: * A higher weight sharpens the resulting anti-aliased image;
9079: * lower weights blur it out more (but keep the "center" black
9080: * as per the preceding note).
9081: * ======================================================================= */
9082: /* --- entry point --- */
9083: int aalowpass (raster *rp, intbyte *bytemap, int grayscale)
9084: {
9085: /* -------------------------------------------------------------------------
9086: Allocations and Declarations
9087: -------------------------------------------------------------------------- */
9088: int status = 1; /* 1=success, 0=failure to caller */
9089: pixbyte *bitmap= (rp==NULL?NULL:rp->pixmap); /*local rp->pixmap ptr*/
9090: int irow=0, icol=0; /* rp->height, rp->width indexes */
9091: int weights[9] = { 1,3,1, 3,0,3, 1,3,1 }; /* matrix of weights */
9092: int adjindex[9]= { 0,1,2, 7,-1,3, 6,5,4 }; /*clockwise from upper-left*/
9093: int totwts = 0; /* sum of all weights in matrix */
9094: int isforceavg = 1, /*force avg black if center black?*/
9095: isminmaxwts = 1, /*use wts or #pts for min/max test */
9096: blackscale = 0; /*(grayscale+1)/4;*/ /*force black if wgted avg>bs */
9097: /* -------------------------------------------------------------------------
9098: Initialization
9099: -------------------------------------------------------------------------- */
9100: /* --- calculate total weights --- */
9101: weights[4]= centerwt; /* weight for center point */
9102: weights[1]= weights[3]= weights[5]= weights[7]= adjacentwt; /*adjacent pts*/
9103: totwts = centerwt + 4*(1+adjacentwt); /* tot is center plus neighbors */
9104: /* -------------------------------------------------------------------------
9105: Calculate bytemap as 9-point weighted average over bitmap
9106: -------------------------------------------------------------------------- */
9107: for ( irow=0; irow<rp->height; irow++ )
9108: for ( icol=0; icol<rp->width; icol++ )
9109: {
9110: int ipixel = icol + irow*(rp->width); /* center pixel index */
9111: int jrow=0, jcol=0, /* box around ipixel */
9112: bitval = 0, /* value of bit/pixel at jrow,jcol */
9113: iscenter = 0, /* set true if center pixel black */
9114: nadjacent=0, wadjacent=0, /* #adjacent black pixels, their wts*/
9115: ngaps = 0, /* #gaps in 8 pixels around center */
9116: iwt=(-1), sumwts=0; /* weights index, sum in-bound wts */
9117: char adjmatrix[8]; /* adjacency "matrix" */
9118: memset(adjmatrix,0,8); /* zero out adjacency matrix */
9119: bytemap[ipixel] = 0; /* init pixel white */
9120: /*--- for ipixel at irow,icol, get weighted average of adjacent pixels ---*/
9121: for ( jrow=irow-1; jrow<=irow+1; jrow++ ) /* jrow = irow-1...irow+1 */
9122: for ( jcol=icol-1; jcol<=icol+1; jcol++ ) /* jcol = icol-1...icol+1 */
9123: {
9124: int jpixel = jcol + jrow*(rp->width); /* averaging index */
9125: iwt++; /*always bump weight index*/
9126: if ( jrow<0 || jrow>=rp->height /* if row out pf bounds */
9127: || jcol<0 || jcol>=rp->width ) /* or col out of bounds */
9128: continue; /* ignore this point */
9129: bitval = (int)getlongbit(bitmap,jpixel); /* value of bit at jrow,jcol */
9130: if ( bitval ) /* this is a black pixel */
9131: { if ( jrow==irow && jcol==icol ) /* and this is center point */
9132: iscenter = 1; /* set flag for center point black */
9133: else /* adjacent point black */
9134: { nadjacent++; /* bump adjacent black count */
9135: adjmatrix[adjindex[iwt]] = 1; } /*set "bit" in adjacency matrix*/
9136: wadjacent += weights[iwt]; } /* sum weights for black pixels */
9137: sumwts += weights[iwt]; /* and sum weights for all pixels */
9138: } /* --- end-of-for(jrow,jcol) --- */
9139: /* --- count gaps --- */
9140: ngaps = (adjmatrix[7]!=adjmatrix[0]?1:0); /* init count */
9141: for ( iwt=0; iwt<7; iwt++ ) /* clockwise around adjacency */
9142: if ( adjmatrix[iwt] != adjmatrix[iwt+1] ) ngaps++; /* black/white flip */
9143: ngaps /= 2; /*each gap has 2 black/white flips*/
9144: /* --- anti-alias pixel, but leave it black if it was already black --- */
9145: if ( isforceavg && iscenter ) /* force avg if center point black */
9146: bytemap[ipixel] = grayscale-1; /* so force grayscale-1=black */
9147: else /* center point not black */
9148: if ( ngaps <= 2 ) /*don't darken checkerboarded pixel*/
9149: { bytemap[ipixel] = /* 0=white ... grayscale-1=black */
9150: ((totwts/2 - 1) + (grayscale-1)*wadjacent)/totwts; /* not /sumwts; */
9151: if ( blackscale > 0 /* blackscale kludge turned on */
9152: && bytemap[ipixel] > blackscale ) /* weighted avg > blackscale */
9153: bytemap[ipixel] = grayscale-1; } /* so force it entirely black */
9154: /*--- only anti-alias pixels whose adjacent pixels fall within bounds ---*/
9155: if ( !iscenter ) /* apply min/maxadjacent test */
9156: if ( isminmaxwts ) /* min/max refer to adjacent weights*/
9157: { if ( wadjacent < minadjacent /* wts of adjacent points too low */
9158: || wadjacent > maxadjacent ) /* or too high */
9159: bytemap[ipixel] = 0; } /* so leave point white */
9160: else /* min/max refer to #adjacent points*/
9161: { if ( nadjacent < minadjacent /* too few adjacent points black */
9162: || nadjacent > maxadjacent ) /* or too many */
9163: bytemap[ipixel] = 0; } /* so leave point white */
9164: } /* --- end-of-for(irow,icol) --- */
9165: /* -------------------------------------------------------------------------
9166: Back to caller with gray-scale anti-aliased bytemap
9167: -------------------------------------------------------------------------- */
9168: /*end_of_job:*/
9169: return ( status );
9170: } /* --- end-of-function aalowpass() --- */
9171:
9172:
9173: /* ==========================================================================
9174: * Function: aapnm ( rp, bytemap, grayscale )
9175: * Purpose: calculates a lowpass anti-aliased bytemap
9176: * for rp->bitmap, with each byte 0...grayscale-1,
9177: * based on the pnmalias.c algorithm
9178: * --------------------------------------------------------------------------
9179: * Arguments: rp (I) raster * to raster whose bitmap
9180: * is to be anti-aliased
9181: * bytemap (O) intbyte * to bytemap, calculated
9182: * by applying pnm-based filter to rp->bitmap,
9183: * and returned (as you'd expect) in 1-to-1
9184: * addressing correspondence with rp->bitmap
9185: * grayscale (I) int containing number of grayscales
9186: * to be calculated, 0...grayscale-1
9187: * (should typically be given as 256)
9188: * --------------------------------------------------------------------------
9189: * Returns: ( int ) 1=success, 0=any error
9190: * --------------------------------------------------------------------------
9191: * Notes: o Based on the pnmalias.c algorithm in the netpbm package
9192: * on sourceforge.
9193: * ======================================================================= */
9194: /* --- entry point --- */
9195: int aapnm (raster *rp, intbyte *bytemap, int grayscale)
9196: {
9197: /* -------------------------------------------------------------------------
9198: Allocations and Declarations
9199: -------------------------------------------------------------------------- */
9200: pixbyte *bitmap = rp->pixmap; /* local rp->pixmap ptr */
9201: int width=rp->width, height=rp->height, /* width, height of raster */
9202: icol = 0, irow = 0, /* width, height indexes */
9203: imap = (-1); /* pixel index = icol + irow*width */
9204: int bgbitval=0, fgbitval=1; /* background, foreground bitval */
9205: #if 0
9206: int totwts=12, wts[9]={1,1,1, 1,4,1, 1,1,1}; /* pnmalias default wts */
9207: int totwts=16, wts[9]={1,2,1, 2,4,2, 1,2,1}; /* weights */
9208: #endif
9209: int totwts=18, wts[9]={1,2,1, 2,6,2, 1,2,1}; /* pnmalias default wts */
9210: int isresetparams = 1, /* true to set antialiasing params */
9211: isfgalias = 1, /* true to antialias fg bits */
9212: isfgonly = 0, /* true to only antialias fg bits */
9213: isbgalias = 0, /* true to antialias bg bits */
9214: isbgonly = 0; /* true to only antialias bg bits */
9215: /* -------------------------------------------------------------------------
9216: Initialization
9217: -------------------------------------------------------------------------- */
9218: /* --- check for bold light --- */
9219: if ( 0 )
9220: { if ( weightnum > 2 ) { isbgalias=1; } /* simulate bold */
9221: if ( weightnum < 1 ) { isbgonly=1; isfgalias=0; } } /* simulate light */
9222: /* --- reset wts[], etc, and calculate total weights --- */
9223: if ( isresetparams ) /* wts[], etc taken from params */
9224: { int iwt=0; /* wts[iwt] index */
9225: wts[4]= centerwt; /* weight for center point */
9226: wts[1]=wts[3]=wts[5]=wts[7] = adjacentwt; /* and adjacent points */
9227: wts[0]=wts[2]=wts[6]=wts[8] = cornerwt; /* and corner points */
9228: for ( totwts=0,iwt=0; iwt<9; iwt++ ) totwts += wts[iwt]; /* sum wts */
9229: isfgalias = fgalias; /* set isfgalias */
9230: isfgonly = fgonly; /* set isfgonly */
9231: isbgalias = bgalias; /* set isbgalias */
9232: isbgonly = bgonly; } /* set isbgonly */
9233: /* -------------------------------------------------------------------------
9234: Calculate bytemap as 9-point weighted average over bitmap
9235: -------------------------------------------------------------------------- */
9236: for ( irow=0; irow<height; irow++ )
9237: for ( icol=0; icol<width; icol++ )
9238: {
9239: /* --- local allocations and declarations --- */
9240: int bitval=0, /* value of rp bit at irow,icol */
9241: nnbitval=0, nebitval=0, eebitval=0, sebitval=0, /*adjacent vals*/
9242: ssbitval=0, swbitval=0, wwbitval=0, nwbitval=0; /*compass pt names*/
9243: int isbgedge=0, isfgedge=0; /*does pixel border a bg or fg edge*/
9244: int aabyteval=0; /* antialiased (or unchanged) value*/
9245: /* --- bump imap index and get center bit value --- */
9246: imap++; /* imap = icol + irow*width */
9247: bitval = getlongbit(bitmap,imap); /* value of rp input bit at imap */
9248: aabyteval = (intbyte)(bitval==bgbitval?0:grayscale-1); /* default aa val */
9249: bytemap[imap] = (intbyte)(aabyteval); /* init antialiased pixel */
9250: /* --- check if we're antialiasing this pixel --- */
9251: if ( (isbgonly && bitval==fgbitval) /* only antialias background bit */
9252: || (isfgonly && bitval==bgbitval) ) /* only antialias foreground bit */
9253: continue; /* leave default and do next bit */
9254: /* --- get surrounding bits --- */
9255: if ( irow > 0 ) /* nn (north) bit available */
9256: nnbitval = getlongbit(bitmap,imap-width); /* nn bit value */
9257: if ( irow < height-1 ) /* ss (south) bit available */
9258: ssbitval = getlongbit(bitmap,imap+width); /* ss bit value */
9259: if ( icol > 0 ) /* ww (west) bit available */
9260: { wwbitval = getlongbit(bitmap,imap-1); /* ww bit value */
9261: if ( irow > 0 ) /* nw bit available */
9262: nwbitval = getlongbit(bitmap,imap-width-1); /* nw bit value */
9263: if ( irow < height-1 ) /* sw bit available */
9264: swbitval = getlongbit(bitmap,imap+width-1); } /* sw bit value */
9265: if ( icol < width-1 ) /* ee (east) bit available */
9266: { eebitval = getlongbit(bitmap,imap+1); /* ee bit value */
9267: if ( irow > 0 ) /* ne bit available */
9268: nebitval = getlongbit(bitmap,imap-width+1); /* ne bit value */
9269: if ( irow < height-1 ) /* se bit available */
9270: sebitval = getlongbit(bitmap,imap+width+1); } /* se bit value */
9271: /* --- check for edges --- */
9272: isbgedge = /* current pixel borders a bg edge */
9273: (nnbitval==bgbitval && eebitval==bgbitval) || /*upper-right edge*/
9274: (eebitval==bgbitval && ssbitval==bgbitval) || /*lower-right edge*/
9275: (ssbitval==bgbitval && wwbitval==bgbitval) || /*lower-left edge*/
9276: (wwbitval==bgbitval && nnbitval==bgbitval) ; /*upper-left edge*/
9277: isfgedge = /* current pixel borders an fg edge*/
9278: (nnbitval==fgbitval && eebitval==fgbitval) || /*upper-right edge*/
9279: (eebitval==fgbitval && ssbitval==fgbitval) || /*lower-right edge*/
9280: (ssbitval==fgbitval && wwbitval==fgbitval) || /*lower-left edge*/
9281: (wwbitval==fgbitval && nnbitval==fgbitval) ; /*upper-left edge*/
9282: /* --- antialias if necessary --- */
9283: if ( (isbgalias && isbgedge) /* alias pixel surrounding bg */
9284: || (isfgalias && isfgedge) /* alias pixel surrounding fg */
9285: || (isbgedge && isfgedge) ) /* neighboring fg and bg pixel */
9286: {
9287: int aasumval = /* sum wts[]*bitmap[] */
9288: wts[0]*nwbitval + wts[1]*nnbitval + wts[2]*nebitval +
9289: wts[3]*wwbitval + wts[4]*bitval + wts[5]*eebitval +
9290: wts[6]*swbitval + wts[7]*ssbitval + wts[8]*sebitval ;
9291: double aawtval = ((double)aasumval)/((double)totwts); /* weighted val */
9292: aabyteval= (int)(((double)(grayscale-1))*aawtval+0.5); /*0...grayscale-1*/
9293: bytemap[imap] = (intbyte)(aabyteval); /* set antialiased pixel */
9294: if ( msglevel>=99 && msgfp!=NULL ) fprintf(msgfp, /* debugging */
9295: "aapnm> irow,icol,imap=%d,%d,%d aawtval=%.4f aabyteval=%d\n",
9296: irow,icol,imap, aawtval,aabyteval);
9297: } /* --- end-of-if(isedge) --- */
9298: } /* --- end-of-for(irow,icol) --- */
9299: /* -------------------------------------------------------------------------
9300: Back to caller with gray-scale anti-aliased bytemap
9301: -------------------------------------------------------------------------- */
9302: /*end_of_job:*/
9303: return ( 1 );
9304: } /* --- end-of-function aapnm() --- */
9305:
9306:
9307: /* ==========================================================================
9308: * Function: aasupsamp ( rp, aa, sf, grayscale )
9309: * Purpose: calculates a supersampled anti-aliased bytemap
9310: * for rp->bitmap, with each byte 0...grayscale-1
9311: * --------------------------------------------------------------------------
9312: * Arguments: rp (I) raster * to raster whose bitmap
9313: * is to be anti-aliased
9314: * aa (O) address of raster * to supersampled bytemap,
9315: * calculated by supersampling rp->bitmap
9316: * sf (I) int containing supersampling shrinkfactor
9317: * grayscale (I) int containing number of grayscales
9318: * to be calculated, 0...grayscale-1
9319: * (should typically be given as 256)
9320: * --------------------------------------------------------------------------
9321: * Returns: ( int ) 1=success, 0=any error
9322: * --------------------------------------------------------------------------
9323: * Notes: o If the center point of the box being averaged is black,
9324: * then the entire "average" is forced black (grayscale-1)
9325: * regardless of the surrounding points. This is my attempt
9326: * to avoid a "washed-out" appearance of thin (one-pixel-wide)
9327: * lines, which would otherwise turn from black to a gray shade.
9328: * ======================================================================= */
9329: /* --- entry point --- */
9330: int aasupsamp (raster *rp, raster **aa, int sf, int grayscale)
9331: {
9332: /* -------------------------------------------------------------------------
9333: Allocations and Declarations
9334: -------------------------------------------------------------------------- */
9335: int status = 0; /* 1=success, 0=failure to caller */
9336: int rpheight=rp->height, rpwidth=rp->width, /*bitmap raster dimensions*/
9337: heightrem=0, widthrem=0, /* rp+rem is a multiple of shrinkf */
9338: aaheight=0, aawidth=0, /* supersampled dimensions */
9339: aapixsz=8; /* output pixels are 8-bit bytes */
9340: int maxaaval=(-9999), /* max grayscale val set in matrix */
9341: isrescalemax=1; /* 1=rescale maxaaval to grayscale */
9342: int irp=0,jrp=0, iaa=0,jaa=0, iwt=0,jwt=0; /*indexes, i=width j=height*/
9343: raster *aap=NULL, *new_raster(); /* raster for supersampled image */
9344: raster *aaweights(); /* get weight matrix applied to rp */
9345: static raster *aawts = NULL; /* aaweights() resultant matrix */
9346: static int prevshrink = NOVALUE, /* shrinkfactor from previous call */
9347: sumwts = 0; /* sum of weights */
9348: static int blackfrac = 40, /* force black if this many pts are */
9349: /*grayfrac = 20,*/
9350: maxwt = 10, /* max weight in weight matrix */
9351: minwtfrac=10, maxwtfrac=70; /* force light pts white, dark black*/
9352: int type_raster(), type_bytemap(); /* debugging display routines */
9353: int delete_raster(); /* delete old rasters */
9354: /* -------------------------------------------------------------------------
9355: Initialization
9356: -------------------------------------------------------------------------- */
9357: /* --- check args --- */
9358: if ( aa == NULL ) goto end_of_job; /* no ptr for return output arg */
9359: *aa = NULL; /* init null ptr for error return */
9360: if ( rp == NULL /* no ptr to input arg */
9361: || sf < 1 /* invalid shrink factor */
9362: || grayscale < 2 ) goto end_of_job; /* invalid grayscale */
9363: /* --- get weight matrix (or use current one) --- */
9364: if ( sf != prevshrink ) /* have new shrink factor */
9365: { if ( aawts != NULL ) /* have unneeded weight matrix */
9366: delete_raster(aawts); /* so free it */
9367: sumwts = 0; /* reinitialize sum of weights */
9368: aawts = aaweights(sf,sf); /* get new weight matrix */
9369: if ( aawts != NULL ) /* got weight matrix okay*/
9370: for ( jwt=0; jwt<sf; jwt++ ) /* for each row */
9371: for ( iwt=0; iwt<sf; iwt++ ) /* and each column */
9372: { int wt = (int)(getpixel(aawts,jwt,iwt)); /* weight */
9373: if ( wt > maxwt ) /* don't overweight center pts */
9374: { wt = maxwt; /* scale it back */
9375: setpixel(aawts,jwt,iwt,wt); } /* and replace it in matrix */
9376: sumwts += wt; } /* add weight to sum */
9377: prevshrink = sf; } /* save new shrink factor */
9378: if ( msgfp!=NULL && msglevel>=999 )
9379: { fprintf(msgfp,"aasupsamp> sf=%d, sumwts=%d weights=...\n", sf,sumwts);
9380: type_bytemap((intbyte *)aawts->pixmap,grayscale,
9381: aawts->width,aawts->height,msgfp); }
9382: /* --- calculate supersampled height,width and allocate output raster */
9383: heightrem = rpheight%sf; /* remainder after division... */
9384: widthrem = rpwidth%sf; /* ...by shrinkfactor */
9385: aaheight = 1+(rpheight+sf-(heightrem+1))/sf; /* ss height */
9386: aawidth = 1+(rpwidth+sf-(widthrem+1))/sf; /* ss width */
9387: if ( msgfp!=NULL && msglevel>=999 )
9388: { fprintf(msgfp,"aasupsamp> rpwid,ht=%d,%d wd,htrem=%d,%d aawid,ht=%d,%d\n",
9389: rpwidth,rpheight, widthrem,heightrem, aawidth,aaheight);
9390: fprintf(msgfp,"aasupsamp> dump of original bitmap image...\n");
9391: type_raster(rp,msgfp); } /* ascii image of rp raster */
9392: if ( (aap = new_raster(aawidth,aaheight,aapixsz)) /* alloc output raster*/
9393: == NULL ) goto end_of_job; /* quit if alloc fails */
9394: /* -------------------------------------------------------------------------
9395: Step through rp->bitmap, applying aawts to each "submatrix" of bitmap
9396: -------------------------------------------------------------------------- */
9397: for ( jaa=0,jrp=(-(heightrem+1)/2); jrp<rpheight; jrp+=sf ) /* height */
9398: {
9399: for ( iaa=0,irp=(-(widthrem+1)/2); irp<rpwidth; irp+=sf ) /* width */
9400: {
9401: int aaval=0; /* weighted rpvals */
9402: int nrp=0, mrp=0; /* #rp bits set, #within matrix */
9403: for ( jwt=0; jwt<sf; jwt++ )
9404: for ( iwt=0; iwt<sf; iwt++ )
9405: {
9406: int i=irp+iwt, j=jrp+jwt; /* rp->pixmap point */
9407: int rpval = 0; /* rp->pixmap value at i,j */
9408: if ( i>=0 && i<rpwidth /* i within actual pixmap */
9409: && j>=0 && j<rpheight ) /* ditto j */
9410: { mrp++; /* count another bit within matrix */
9411: rpval = (int)(getpixel(rp,j,i)); } /* get actual pixel value */
9412: if ( rpval != 0 )
9413: { nrp++; /* count another bit set */
9414: aaval += (int)(getpixel(aawts,jwt,iwt)); } /* sum weighted vals */
9415: } /* --- end-of-for(iwt,jwt) --- */
9416: if ( aaval > 0 ) /*normalize and rescale non-zero val*/
9417: { int aafrac = (100*aaval)/sumwts; /* weighted percent of black points */
9418: /*if((100*nrp)/mrp >=blackfrac)*/ /* many black interior pts */
9419: if( aafrac >= maxwtfrac ) /* high weight of sampledblack pts */
9420: aaval = grayscale-1; /* so set supersampled pt black */
9421: else if( aafrac <= minwtfrac ) /* low weight of sampledblack pts */
9422: aaval = 0; /* so set supersampled pt white */
9423: else /* rescale calculated weight */
9424: aaval = ((sumwts/2 - 1) + (grayscale-1)*aaval)/sumwts; }
9425: maxaaval = max2(maxaaval,aaval); /* largest aaval so far */
9426: if ( msgfp!=NULL && msglevel>=999 )
9427: fprintf(msgfp,"aasupsamp> jrp,irp=%d,%d jaa,iaa=%d,%d"
9428: " mrp,nrp=%d,%d aaval=%d\n",
9429: jrp,irp, jaa,iaa, mrp,nrp, aaval);
9430: if ( jaa<aaheight && iaa<aawidth ) /* bounds check */
9431: setpixel(aap,jaa,iaa,aaval); /*weighted val in supersamp raster*/
9432: else if( msgfp!=NULL && msglevel>=9 ) /* emit error if out-of-bounds */
9433: fprintf(msgfp,"aasupsamp> Error: aaheight,aawidth=%d,%d jaa,iaa=%d,%d\n",
9434: aaheight,aawidth, jaa,iaa);
9435: iaa++; /* bump aa col index */
9436: } /* --- end-of-for(irp) --- */
9437: jaa++; /* bump aa row index */
9438: } /* --- end-of-for(jrp) --- */
9439: /* --- rescale supersampled image so darkest points become black --- */
9440: if ( isrescalemax ) /* flag set to rescale maxaaval */
9441: {
9442: double scalef = ((double)(grayscale-1))/((double)maxaaval);
9443: for ( jaa=0; jaa<aaheight; jaa++ ) /* height */
9444: for ( iaa=0; iaa<aawidth; iaa++ ) /* width */
9445: { int aafrac, aaval = getpixel(aap,jaa,iaa); /* un-rescaled value */
9446: aaval = (int)(0.5+((double)aaval)*scalef); /*multiply by scale factor*/
9447: aafrac = (100*aaval)/(grayscale-1); /* fraction of blackness */
9448: if( aafrac >= blackfrac ) /* high weight of sampledblack pts */
9449: aaval = grayscale-1; /* so set supersampled pt black */
9450: else if( 0&&aafrac <= minwtfrac ) /* low weight of sampledblack pts */
9451: aaval = 0; /* so set supersampled pt white */
9452: setpixel(aap,jaa,iaa,aaval); } /* replace rescaled val in raster */
9453: } /* --- end-of-if(isrescalemax) --- */
9454: *aa = aap; /* return supersampled image*/
9455: status = 1; /* set successful status */
9456: if ( msgfp!=NULL && msglevel>=999 )
9457: { fprintf(msgfp,"aasupsamp> anti-aliased image...\n");
9458: type_bytemap((intbyte *)aap->pixmap,grayscale,
9459: aap->width,aap->height,msgfp); fflush(msgfp); }
9460: /* -------------------------------------------------------------------------
9461: Back to caller with gray-scale anti-aliased bytemap
9462: -------------------------------------------------------------------------- */
9463: end_of_job:
9464: return ( status );
9465: } /* --- end-of-function aasupsamp() --- */
9466:
9467:
9468: /* ==========================================================================
9469: * Function: aacolormap ( bytemap, nbytes, colors, colormap )
9470: * Purpose: searches bytemap, returning a list of its discrete values
9471: * in ascending order in colors[], and returning an "image"
9472: * of bytemap (where vales are replaced by colors[]
9473: * indexes) in colormap[].
9474: * --------------------------------------------------------------------------
9475: * Arguments: bytemap (I) intbyte * to bytemap containing
9476: * grayscale values (usually 0=white
9477: * through 255=black) for which colors[]
9478: * and colormap[] will be constructed.
9479: * nbytes (I) int containing #bytes in bytemap
9480: * (usually just #rows * #cols)
9481: * colors (O) intbyte * (to be interpreted as ints)
9482: * returning a list of the discrete/different
9483: * values in bytemap, in ascending value order
9484: * colormap (O) intbyte * returning a bytemap "image",
9485: * i.e., in one-to-one pixel correspondence
9486: * with bytemap, but where the values have been
9487: * replaced with corresponding colors[] indexes.
9488: * --------------------------------------------------------------------------
9489: * Returns: ( int ) #colors in colors[], or 0 for any error
9490: * --------------------------------------------------------------------------
9491: * Notes: o
9492: * ======================================================================= */
9493: /* --- entry point --- */
9494: int aacolormap ( intbyte *bytemap, int nbytes,
9495: intbyte *colors, intbyte *colormap )
9496: {
9497: /* -------------------------------------------------------------------------
9498: Allocations and Declarations
9499: -------------------------------------------------------------------------- */
9500: int ncolors = 0, /* #different values in bytemap */
9501: igray, grayscale = 256; /* bytemap contains intbyte's */
9502: intbyte *bytevalues = NULL; /* 1's where bytemap contains value*/
9503: int ibyte; /* bytemap/colormap index */
9504: int isscale = 0; /* true to scale largest val to 255*/
9505: int maxcolors = 0; /* maximum ncolors */
9506: /* -------------------------------------------------------------------------
9507: Accumulate colors[] from values occurring in bytemap
9508: -------------------------------------------------------------------------- */
9509: /* --- initialization --- */
9510: if ( (bytevalues = (intbyte *)malloc(grayscale)) /*alloc bytevalues*/
9511: == NULL ) goto end_of_job; /* signal error if malloc() failed */
9512: memset(bytevalues,0,grayscale); /* zero out bytevalues */
9513: /* --- now set 1's at offsets corresponding to values found in bytemap --- */
9514: for ( ibyte=0; ibyte<nbytes; ibyte++ ) /* for each byte in bytemap */
9515: bytevalues[(int)bytemap[ibyte]] = 1; /*use its value to index bytevalues*/
9516: /* --- collect the 1's indexes in colors[] --- */
9517: for ( igray=0; igray<grayscale; igray++ ) /* check all possible values */
9518: if ( (int)bytevalues[igray] ) /*bytemap contains igray somewheres*/
9519: { colors[ncolors] = (intbyte)igray; /* so store igray in colors */
9520: bytevalues[igray] = (intbyte)ncolors; /* save colors[] index */
9521: if ( maxcolors>0 && ncolors>=maxcolors ) /* too many color indexes */
9522: bytevalues[igray] = (intbyte)(maxcolors-1); /*so scale back to max*/
9523: ncolors++; } /* and bump #colors */
9524: /* --- rescale colors so largest, colors[ncolors-1], is black --- */
9525: if ( isscale ) /* only rescale if requested */
9526: if ( ncolors > 1 ) /* and if not a "blank" raster */
9527: if ( colors[ncolors-1] > 0 ) /*and at least one pixel non-white*/
9528: {
9529: /* --- multiply each colors[] by factor that scales largest to 255 --- */
9530: double scalefactor = ((double)(grayscale-1))/((double)colors[ncolors-1]);
9531: for ( igray=1; igray<ncolors; igray++ ) /* re-scale each colors[] */
9532: { colors[igray] = min2(grayscale-1,(int)(scalefactor*colors[igray]+0.5));
9533: if (igray>5) colors[igray] = min2(grayscale-1,colors[igray]+2*igray); }
9534: } /* --- end-of-if(isscale) --- */
9535: /* -------------------------------------------------------------------------
9536: Construct colormap
9537: -------------------------------------------------------------------------- */
9538: for ( ibyte=0; ibyte<nbytes; ibyte++ ) /* for each byte in bytemap */
9539: colormap[ibyte] = bytevalues[(int)bytemap[ibyte]]; /*index for this value*/
9540: /* -------------------------------------------------------------------------
9541: back to caller with #colors, or 0 for any error
9542: -------------------------------------------------------------------------- */
9543: end_of_job:
9544: if ( bytevalues != NULL ) free(bytevalues); /* free working memory */
9545: if ( maxcolors>0 && ncolors>maxcolors ) /* too many color indexes */
9546: ncolors = maxcolors; /* return maximum to caller */
9547: return ( ncolors ); /* back with #colors, or 0=error */
9548: } /* --- end-of-function aacolormap() --- */
9549:
9550:
9551: /* ==========================================================================
9552: * Function: aaweights ( width, height )
9553: * Builds "canonical" weight matrix, width x height, in a raster
9554: * (see Notes below for discussion).
9555: * --------------------------------------------------------------------------
9556: * Arguments: width (I) int containing width (#cols) of returned
9557: * raster/matrix of weights
9558: * height (I) int containing height (#rows) of returned
9559: * raster/matrix of weights
9560: * --------------------------------------------------------------------------
9561: * Returns: ( raster * ) ptr to raster containing width x height
9562: * weight matrix, or NULL for any error
9563: * --------------------------------------------------------------------------
9564: * Notes: o For example, given width=7, height=5, builds the matrix
9565: * 1 2 3 4 3 2 1
9566: * 2 4 6 8 6 4 2
9567: * 3 6 9 12 9 6 3
9568: * 2 4 6 8 6 4 2
9569: * 1 2 3 4 3 2 1
9570: * If an even dimension given, the two center numbers stay
9571: * the same, e.g., 123321 for the top row if width=6.
9572: * o For an odd square n x n matrix, the sum of all n^2
9573: * weights will be ((n+1)/2)^4.
9574: * o The largest weight (in the allocated pixsz=8 raster) is 255,
9575: * so the largest square matrix is 31 x 31. Any weight that
9576: * tries to grow beyond 255 is held constant at 255.
9577: * o A new_raster(), pixsz=8, is allocated for the caller.
9578: * To avoid memory leaks, be sure to delete_raster() when done.
9579: * ======================================================================= */
9580: /* --- entry point --- */
9581: raster *aaweights ( int width, int height )
9582: {
9583: /* -------------------------------------------------------------------------
9584: Allocations and Declarations
9585: -------------------------------------------------------------------------- */
9586: raster *new_raster(), *weights=NULL; /* raster of weights returned */
9587: int irow=0, icol=0, /* height, width indexes */
9588: weight = 0; /*running weight, as per Notes above*/
9589: /* -------------------------------------------------------------------------
9590: Initialization
9591: -------------------------------------------------------------------------- */
9592: /* --- allocate raster for weights --- */
9593: if ( (weights = new_raster(width,height,8)) /* allocate 8-bit byte raster */
9594: == NULL ) goto end_of_job; /* return NULL error if failed */
9595: /* -------------------------------------------------------------------------
9596: Fill weight matrix, as per Notes above
9597: -------------------------------------------------------------------------- */
9598: for ( irow=0; irow<height; irow++ ) /* outer loop over rows */
9599: for ( icol=0; icol<width; icol++ ) /* inner loop over cols */
9600: {
9601: int jrow = height-irow-1, /* backwards irow, height-1,...,0 */
9602: jcol = width-icol-1; /* backwards icol, width-1,...,0 */
9603: weight = min2(irow+1,jrow+1) * min2(icol+1,jcol+1); /* weight */
9604: if ( aaalgorithm == 1 ) weight=1; /* force equal weights */
9605: setpixel(weights,irow,icol,min2(255,weight)); /*store weight in matrix*/
9606: } /* --- end-of-for(irow,icol) --- */
9607: end_of_job:
9608: return ( weights ); /* back with weights or NULL=error */
9609: } /* --- end-of-function aaweights() --- */
9610:
9611:
9612: /* ==========================================================================
9613: * Function: aawtpixel ( image, ipixel, weights, rotate )
9614: * Purpose: Applies matrix of weights to the pixels
9615: * surrounding ipixel in image, rotated clockwise
9616: * by rotate degrees (typically 0 or 30).
9617: * --------------------------------------------------------------------------
9618: * Arguments: image (I) raster * to bitmap (though it can be bytemap)
9619: * containing image with pixels to be averaged.
9620: * ipixel (I) int containing index (irow*width+icol) of
9621: * center pixel of image for weighted average.
9622: * weights (I) raster * to bytemap of relative weights
9623: * (0-255), whose dimensions (usually odd width
9624: * and odd height) determine the "subgrid" of
9625: * image surrounding ipixel to be averaged.
9626: * rotate (I) int containing degrees clockwise rotation
9627: * (typically 0 or 30), i.e., imagine weights
9628: * rotated clockwise and then averaging the
9629: * image pixels "underneath" it now.
9630: * --------------------------------------------------------------------------
9631: * Returns: ( int ) 0-255 weighted average, or -1 for any error
9632: * --------------------------------------------------------------------------
9633: * Notes: o The rotation matrix used (when requested) is
9634: * / x' \ / cos(theta) sin(theta)/a \ / x \
9635: * | | = | | | |
9636: * \ y' / \ -a*sin(theta) cos(theta) / \ y /
9637: * where a=1 (current default) is the pixel (not screen)
9638: * aspect ratio width:height, and theta is rotate (converted
9639: * from degrees to radians). Then x=col,y=row are the integer
9640: * pixel coords relative to the input center ipixel, and
9641: * x',y' are rotated coords which aren't necessarily integer.
9642: * The actual pixel used is the one nearest x',y'.
9643: * ======================================================================= */
9644: /* --- entry point --- */
9645: int aawtpixel ( raster *image, int ipixel, raster *weights, int rotate )
9646: {
9647: /* -------------------------------------------------------------------------
9648: Allocations and Declarations
9649: -------------------------------------------------------------------------- */
9650: int aaimgval = 0, /* weighted avg returned to caller */
9651: totwts=0, sumwts=0; /* total of all wts, sum wts used */
9652: int pixsz = image->pixsz, /* #bits per image pixel */
9653: black1=1, black8=255, /* black for 1-bit, 8-bit pixels */
9654: black = (pixsz==1? black1:black8), /* black value for our image */
9655: scalefactor = (black1+black8-black), /* only scale 1-bit images */
9656: iscenter = 0; /* set true if center pixel black */
9657: /* --- grid dimensions and indexes --- */
9658: int wtheight = weights->height, /* #rows in weight matrix */
9659: wtwidth = weights->width, /* #cols in weight matrix */
9660: imgheight = image->height, /* #rows in image */
9661: imgwidth = image->width; /* #cols in image */
9662: int wtrow, wtrow0 = wtheight/2, /* center row index for weights */
9663: wtcol, wtcol0 = wtwidth/2, /* center col index for weights */
9664: imgrow, imgrow0= ipixel/imgwidth, /* center row index for ipixel */
9665: imgcol, imgcol0= ipixel-(imgrow0*imgwidth); /*center col for ipixel*/
9666: /* --- rotated grid variables --- */
9667: static int prevrotate = 0; /* rotate from previous call */
9668: static double costheta = 1.0, /* cosine for previous rotate */
9669: sintheta = 0.0; /* and sine for previous rotate */
9670: double a = 1.0; /* default aspect ratio */
9671: /* -------------------------------------------------------------------------
9672: Initialization
9673: -------------------------------------------------------------------------- */
9674: /* --- refresh trig functions for rotate when it changes --- */
9675: if ( rotate != prevrotate ) /* need new sine/cosine */
9676: { costheta = cos(((double)rotate)/57.29578); /*cos of rotate in radians*/
9677: sintheta = sin(((double)rotate)/57.29578); /*sin of rotate in radians*/
9678: prevrotate = rotate; } /* save current rotate as prev */
9679: /* -------------------------------------------------------------------------
9680: Calculate aapixel as weighted average over image points around ipixel
9681: -------------------------------------------------------------------------- */
9682: for ( wtrow=0; wtrow<wtheight; wtrow++ )
9683: for ( wtcol=0; wtcol<wtwidth; wtcol++ )
9684: {
9685: /* --- allocations and declarations --- */
9686: int wt = (int)getpixel(weights,wtrow,wtcol); /* weight for irow,icol */
9687: int drow = wtrow - wtrow0, /* delta row offset from center */
9688: dcol = wtcol - wtcol0; /* delta col offset from center */
9689: int iscenter = 0; /* set true if center point black */
9690: /* --- initialization --- */
9691: totwts += wt; /* sum all weights */
9692: /* --- rotate (if requested) --- */
9693: if ( rotate != 0 ) /* non-zero rotation */
9694: {
9695: /* --- apply rotation matrix to (x=dcol,y=drow) --- */
9696: double dx=(double)dcol, dy=(double)drow, dtemp; /* need floats */
9697: dtemp = dx*costheta + dy*sintheta/a; /* save new dx' */
9698: dy = -a*dx*sintheta + dy*costheta; /* dy becomes new dy' */
9699: dx = dtemp; /* just for notational convenience */
9700: /* --- replace original (drow,dcol) with nearest rotated point --- */
9701: drow = (int)(dy+0.5); /* round dy for nearest row */
9702: dcol = (int)(dx+0.5); /* round dx for nearest col */
9703: } /* --- end-of-if(rotate!=0) --- */
9704: /* --- select image pixel to be weighted --- */
9705: imgrow = imgrow0 + drow; /*apply displacement to center row*/
9706: imgcol = imgcol0 + dcol; /*apply displacement to center col*/
9707: /* --- if pixel in bounds, accumulate weighted average --- */
9708: if ( imgrow>=0 && imgrow<imgheight ) /* row is in bounds */
9709: if ( imgcol>=0 && imgcol<imgwidth ) /* and col is in bounds */
9710: {
9711: /* --- accumulate weighted average --- */
9712: int imgval = (int)getpixel(image,imgrow,imgcol); /* image value */
9713: aaimgval += wt*imgval; /* weighted sum of image values */
9714: sumwts += wt; /* and also sum weights used */
9715: /* --- check if center image pixel black --- */
9716: if ( drow==0 && dcol==0 ) /* this is center ipixel */
9717: if ( imgval==black ) /* and it's black */
9718: iscenter = 1; /* so set black center flag true */
9719: } /* --- end-of-if(bounds checks ok) --- */
9720: } /* --- end-of-for(irow,icol) --- */
9721: if ( 0 && iscenter ) /* center point is black */
9722: aaimgval = black8; /* so force average black */
9723: else /* center point not black */
9724: aaimgval = /* 0=white ... black */
9725: ((totwts/2 - 1) + scalefactor*aaimgval)/totwts; /* not /sumwts; */
9726: /*end_of_job:*/
9727: return ( aaimgval );
9728: } /* --- end-of-function aawtpixel() --- */
9729: #endif /* PART3 */
9730:
9731: /* ---
9732: * PART1
9733: * ------ */
9734: #if !defined(PARTS) || defined(PART1)
9735: #ifdef DRIVER
9736: /* ==========================================================================
9737: * Function: main() driver for mimetex.c
9738: * Purpose: emits a mime xbitmap or gif image of a LaTeX math expression
9739: * entered either as
9740: * (1) html query string from a browser (most typical), or
9741: * (2) a query string from an html <form method="get">
9742: * whose <input name="formdata"> (mostly for demo), or
9743: * (3) command-line arguments (mostly to test).
9744: * If no input supplied, expression defaults to "f(x)=x^2",
9745: * treated as test (input method 3).
9746: * If args entered on command-line (or if no input supplied),
9747: * output is (usually) human-viewable ascii raster images on
9748: * stdout rather than the usual mime xbitmaps or gif images.
9749: * --------------------------------------------------------------------------
9750: * Command-Line Arguments:
9751: * When running mimeTeX from the command-line, rather than
9752: * from a browser, syntax is
9753: * ./mimetex [-d ] dump gif to stdout
9754: * [expression expression, e.g., x^2+y^2,
9755: * |-f input_file] or read expression from file
9756: * [-m msglevel] verbosity of debugging output
9757: * [-s fontsize] default fontsize, 0-5
9758: * -d Rather than ascii debugging output, mimeTeX dumps the
9759: * actual gif (or xbitmap) to stdout, e.g.,
9760: * ./mimetex -d x^2+y^2 > expression.gif
9761: * creates a gif file containing an image of x^2+y^2
9762: * -f Reads expression from input_file, and automatically
9763: * assumes -d switch. The input_file may contain the
9764: * expression on one line or spread out over many lines.
9765: * MimeTeX will concatanate all lines from input_file
9766: * to construct one long expression. Blanks, tabs, and
9767: * newlines will just be ignored.
9768: * -m 0-99, controls verbosity level for debugging output
9769: * (usually used only while testing code).
9770: * -s Font size, 0-5. As usual, the font size can
9771: * also be specified in the expression by a leading
9772: * preamble terminated by $, e.g., 3$f(x)=x^2 displays
9773: * f(x)=x^2 at font size 3. Default font size is 2.
9774: * --------------------------------------------------------------------------
9775: * Exits: 0=success, 1=some error
9776: * --------------------------------------------------------------------------
9777: * Notes: o For an executable that emits mime xbitmaps, compile as
9778: * cc -DXBITMAP mimetex.c -lm -o mimetex.cgi
9779: * or, alternatively, for an executable that emits gif images
9780: * cc -DGIF mimetex.c gifsave.c -lm -o mimetex.cgi
9781: * or for gif images with anti-aliasing
9782: * cc -DGIF -DAA mimetex.c gifsave.c -lm -o mimetex.cgi
9783: * See Notes at top of file for other compile-line -D options.
9784: * o Move executable to your cgi-bin directory and either
9785: * point your browser to it directly in the form
9786: * http://www.yourdomain.com/cgi-bin/mimetex.cgi?3$f(x)=x^2
9787: * or put a tag in your html document of the form
9788: * <img src="../cgi-bin/mimetex.cgi?3$f(x)=x^2"
9789: * border=0 align=absmiddle>
9790: * where f(x)=x^2 (or any other expression) will be displayed
9791: * either as a mime xbitmap or gif image (as per -D flag).
9792: * ======================================================================= */
9793:
9794: /* -------------------------------------------------------------------------
9795: header files and other data
9796: -------------------------------------------------------------------------- */
9797: /* --- (additional) standard headers --- */
9798: /* --- other data --- */
9799: #ifdef DUMPENVIRON
9800: extern char **environ; /* environment information */
9801: #endif
9802:
9803: /* -------------------------------------------------------------------------
9804: globals for gif and png callback functions
9805: -------------------------------------------------------------------------- */
9806: GLOBAL(raster,*bitmap_raster,NULL); /* use 0/1 bitmap image or */
9807: GLOBAL(intbyte,*colormap_raster,NULL); /* anti-aliased color indexes */
9808: /* --- anti-aliasing flags (needed by GetPixel() as well as main()) --- */
9809: #ifdef AA /* if anti-aliasing requested */
9810: #define ISAAVALUE 1 /* turn flag on */
9811: #else
9812: #define ISAAVALUE 0 /* else turn flag off */
9813: #endif
9814: GLOBAL(int,isaa,ISAAVALUE); /* set anti-aliasing flag */
9815:
9816: /* -------------------------------------------------------------------------
9817: logging data structure, and default data to be logged
9818: -------------------------------------------------------------------------- */
9819: /* --- logging data structure --- */
9820: #define logdata struct logdata_struct /* "typedef" for logdata_struct*/
9821: logdata
9822: {
9823: /* -----------------------------------------------------------------------
9824: environment variable name, max #chars to display, min msglevel to display
9825: ------------------------------------------------------------------------ */
9826: char *name; /* environment variable name */
9827: int maxlen; /* max #chars to display */
9828: int msglevel; /* min msglevel to display data */
9829: } ; /* --- end-of-logdata_struct --- */
9830: /* --- data logged by mimeTeX --- */
9831: STATIC logdata mimelog[]
9832: #ifdef INITVALS
9833: =
9834: {
9835: /* ------ variable ------ maxlen msglevel ----- */
9836: { "QUERY_STRING", 999, 4 },
9837: { "REMOTE_ADDR", 999, 3 },
9838: { "HTTP_REFERER", 999, 3 },
9839: { "REQUEST_URI", 999, 5 },
9840: { "HTTP_USER_AGENT", 999, 3 },
9841: { "HTTP_X_FORWARDED_FOR", 999, 3 },
9842: { NULL, -1, -1 } /* trailer record */
9843: } /* --- end-of-mimelog[] --- */
9844: #endif
9845: ;
9846:
9847: /* -------------------------------------------------------------------------
9848: messages
9849: -------------------------------------------------------------------------- */
9850: static char *copyright = /* copyright, gnu/gpl notice */
9851: "+-----------------------------------------------------------------------+\n"
9852: "|mimeTeX vers 1.61, Copyright(c) 2002-2005, John Forkosh Associates, Inc|\n"
9853: "+-----------------------------------------------------------------------+\n"
9854: "| mimeTeX is free software, licensed to you under terms of the GNU/GPL, |\n"
9855: "| and comes with absolutely no warranty whatsoever. |\n"
9856: "+-----------------------------------------------------------------------+";
9857: static int maxmsgnum = 2; /* maximum msgtable[] index */
9858: static char *msgtable[] = { /* messages referenced by [index] */
9859: "\\red\\small\\rm\\fbox{\\array{" /* [0] is invalid_referer_msg */
9860: "Please~read~www.forkosh.com/mimetex.html\\\\and~install~mimetex.cgi~"
9861: "on~your~own~server.\\\\Thank~you,~John~Forkosh}}",
9862: "\\red\\small\\rm\\fbox{\\array{" /* [1] */
9863: "Please~provide~your~{\\tiny~HTTP-REFERER}~to~access~the~public\\\\"
9864: "mimetex~server.~~Or~please~read~~www.forkosh.com/mimetex.html\\\\"
9865: "and~install~mimetex.cgi~on~your~own~server.~~Thank~you,~John~Forkosh}}",
9866: "\\red\\small\\rm\\fbox{\\array{" /* [2] */
9867: "The~public~mimetex~server~is~for~testing.~~For~production,\\\\"
9868: "please~read~~www.forkosh.com/mimetex.html~~and~install\\\\"
9869: "mimetex.cgi~on~your~own~server.~~Thank~you,~John~Forkosh}}",
9870: NULL } ; /* trailer */
9871:
9872:
9873: /* --- entry point --- */
9874: int main ( int argc, char *argv[]
9875: #ifdef DUMPENVP
9876: , char *envp[]
9877: #endif
9878: )
9879: {
9880: /* -------------------------------------------------------------------------
9881: Allocations and Declarations
9882: -------------------------------------------------------------------------- */
9883: /* --- expression to be emitted --- */
9884: static char exprbuffer[16385] = "f(x)=x^2"; /* expression to be processed */
9885: char *expression = exprbuffer; /* ptr to expression */
9886: int size = NORMALSIZE; /* default font size */
9887: char *query = getenv("QUERY_STRING"); /* getenv("QUERY_STRING") result */
9888: char *mimeprep(); /* preprocess expression */
9889: int unescape_url(); /* convert %xx's to ascii chars */
9890: int emitcache(); /* emit cached image if it exists */
9891: int isquery = 0, /* true if input from QUERY_STRING */
9892: isqempty = 0, /* true if query string empty */
9893: isqlogging = 0, /* true if logging in query mode */
9894: isformdata = 0, /* true if input from html form */
9895: isdumpimage = 0; /* true to dump image on stdout */
9896: /* --- rasterization --- */
9897: subraster *rasterize(), *sp; /* rasterize expression */
9898: raster *border_raster(), *bp; /* put a border around raster */
9899: int type_raster(), type_bytemap(), /* screen dump function prototypes */
9900: xbitmap_raster(); /* mime xbitmap output function */
9901: /* --- http_referer --- */
9902: char *referer = REFERER; /* http_referer must contain this */
9903: struct { char *referer; int msgnum; } /* http_referer can't contain this */
9904: denyreferer[] = { /* referer table to deny access to */
9905: #ifdef DENYREFERER
9906: #include DENYREFERER /* e.g., {"",1}, for no referer */
9907: #endif
9908: { NULL, -999 } }; /* trailer */
9909: char *http_referer = getenv("HTTP_REFERER"); /* referer using mimeTeX */
9910: int ishttpreferer = (http_referer==NULL?0:(*http_referer=='\000'?0:1));
9911: int isstrstr(); /* search http_referer for referer */
9912: int isinvalidreferer = 0; /* true for inavlid referer */
9913: int norefmaxlen = NOREFMAXLEN; /*max query_string len if no referer*/
9914: /* --- gif --- */
9915: #if defined(GIF)
9916: int GetPixel(); /* feed pixels to gifsave library */
9917: int GIF_Create(),GIF_CompressImage(),GIF_Close(); /* prototypes for... */
9918: void GIF_SetColor(),GIF_SetTransparent(); /* ...gifsave enntry points */
9919: #endif
9920: char *gif_outfile = (char *)NULL, /* gif output defaults to stdout */
9921: cachefile[256] = "\000", /* full path and name to cache file*/
9922: *md5str(); /* md5 has of expression */
9923: int maxage = 7200; /* max-age is two hours */
9924: /* --- anti-aliasing --- */
9925: intbyte *bytemap_raster = NULL, /* anti-aliased bitmap */
9926: colors[256]; /* grayscale vals in bytemap */
9927: int aalowpass(), aapnm(), /*lowpass filters for anti-aliasing*/
9928: grayscale = 256; /* 0-255 grayscales in 8-bit bytes */
9929: int ncolors=2, /* #colors (2=b&w) */
9930: aacolormap(); /* build colormap from bytemap */
9931: /* --- messages --- */
9932: char logfile[256] = LOGFILE, /*log queries if msglevel>=LOGLEVEL*/
9933: cachelog[256] = CACHELOG; /* cached image log in cachepath/ */
9934: char *timestamp(); /* time stamp for logged messages */
9935: int logger(); /* logs environ variables */
9936: int ismonth(); /* check argv[0] for current month */
9937: char *progname = (argc>0?argv[0]:"noname"); /* name program executed as */
9938: char *dashes = /* separates logfile entries */
9939: "--------------------------------------------------------------------------";
9940: char *invalid_referer_msg = msgtable[0]; /* msg to invalid http_referer */
9941: /* -------------------------------------------------------------------------
9942: initialization
9943: -------------------------------------------------------------------------- */
9944: /* --- run optional system command string --- */
9945: #ifdef SYSTEM
9946: system(SYSTEM);
9947: #endif
9948: /* --- set global variables --- */
9949: msgfp = stdout; /* for comamnd-line mode output */
9950: isss = issupersampling; /* set supersampling flag */
9951: shrinkfactor = shrinkfactors[NORMALSIZE]; /* set shrinkfactor */
9952: /* ---
9953: * check QUERY_STRING query for expression overriding command-line arg
9954: * ------------------------------------------------------------------- */
9955: if ( query != NULL ) /* check query string from environ */
9956: if ( strlen(query) >= 1 ) /* caller gave us a query string */
9957: { strncpy(expression,query,16384); /* so use it as expression */
9958: expression[16384] = '\000'; /* make sure it's null terminated */
9959: isquery = 1; } /* and set isquery flag */
9960: if ( !isquery ) /* empty query string */
9961: { char *host = getenv("HTTP_HOST"), /* additional getenv("") results */
9962: *name = getenv("SERVER_NAME"), *addr = getenv("SERVER_ADDR");
9963: if ( host!=NULL || name!=NULL || addr!=NULL ) /* assume http query */
9964: { isquery = 1; /* set flag to signal query */
9965: strcpy(expression,"\\red\\small\\rm~missing~query~string"); }
9966: isqempty = 1; /* signal empty query string */
9967: } /* --- end-of-if(!isquery) --- */
9968: /* ---
9969: * process command-line input args (if not a query)
9970: * ------------------------------------------------ */
9971: if ( !isquery /* don't have an html query string */
9972: || ( /*isqempty &&*/ argc>1) ) /* or have command-line args */
9973: {
9974: char *argsignal = ARGSIGNAL, /* signals start of mimeTeX args */
9975: stopsignal[32] = "--"; /* default Unix end-of-args signal */
9976: int iarg=0, argnum=0, /*argv[] index for command-line args*/
9977: exprarg = 0, /* argv[] index for expression */
9978: infilearg = 0, /* argv[] index for infile */
9979: nswitches = 0, /* number of -switches */
9980: isstopsignal = 0, /* true after stopsignal found */
9981: isstrict = 1/*iswindows*/, /* true for strict arg checking */
9982: /*nb, windows has apache "x -3" bug*/
9983: nargs=0, nbadargs=0, /* number of arguments, bad ones */
9984: maxbadargs = (isstrict?0:1), /*assume query if too many bad args*/
9985: isgoodargs = 0; /* true to accept command-line args*/
9986: if ( argsignal != NULL ) /* if compiled with -DARGSIGNAL */
9987: while ( argc > ++iarg ) /* check each argv[] for argsignal */
9988: if ( !strcmp(argv[iarg],argsignal) ) /* check for exact match */
9989: { argnum = iarg; /* got it, start parsing next arg */
9990: break; } /* stop looking for argsignal */
9991: while ( argc > ++argnum ) /* check for switches and values, */
9992: {
9993: nargs++; /* count another command-line arg */
9994: if ( strcmp(argv[argnum],stopsignal) == 0 ) /* found stopsignal */
9995: { isstopsignal = 1; /* so set stopsignal flag */
9996: continue; } /* and get expression after it */
9997: if ( !isstopsignal /* haven't seen stopsignal switch */
9998: && *argv[argnum] == '-' ) /* and have some '-' switch */
9999: {
10000: char flag = tolower(*(argv[argnum]+1)); /* single char following '-' */
10001: int arglen = strlen(argv[argnum]) - 1; /* #chars following - */
10002: argnum++; /* arg following flag/switch is usually its value */
10003: nswitches++; /* another switch on command line */
10004: if ( isstrict && arglen!=1 ) /* only single-char switch allowed */
10005: { nbadargs++; argnum--; } /* so ignore longer -xxx switch */
10006: else /* process single-char -x switch */
10007: switch ( flag ) { /* see what user wants to tell us */
10008: /* --- ignore uninterpreted flag --- */
10009: default: nbadargs++; argnum--; break;
10010: /* --- adjustable program parameters (not checking input) --- */
10011: case 'd': isdumpimage++; argnum--; break;
10012: case 'e': isdumpimage++; gif_outfile=argv[argnum]; break;
10013: case 'f': isdumpimage++; infilearg=argnum; break;
10014: case 'm': msglevel = atoi(argv[argnum]); break;
10015: case 'o': istransparent = 0; argnum--; break;
10016: case 's': size = atoi(argv[argnum]); break;
10017: } /* --- end-of-switch(flag) --- */
10018: } /* --- end-of-if(*argv[argnum]=='-') --- */
10019: else /* expression if arg not a -flag */
10020: if ( infilearg == 0 ) /* no infile arg yet */
10021: { if ( exprarg != 0 ) nbadargs++; /* 2nd expression invalid */
10022: exprarg = argnum; /* but take last expression */
10023: /*infilearg = (-1);*/ } /* and set infilearg */
10024: else nbadargs++; /* infile and expression invalid */
10025: } /* --- end-of-while(argc>++argnum) --- */
10026: if ( msglevel>=999 && msgfp!=NULL ) /* display command-line info */
10027: fprintf(msgfp,"argc=%d, progname=%s, #args=%d, #badargs=%d\n",
10028: argc,progname,nargs,nbadargs);
10029: /* ---
10030: * decide whether command-line input overrides query_string
10031: * -------------------------------------------------------- */
10032: if ( isdumpimage > 2 ) nbadargs++; /* duplicate/conflicting -switch */
10033: isgoodargs = ( !isstrict /*good if not doing strict checking*/
10034: || !isquery /* or if no query, must use args */
10035: || (nbadargs<nargs && nbadargs<=maxbadargs) ); /* bad args imply query */
10036: /* ---
10037: * take expression from command-line args
10038: * -------------------------------------- */
10039: if ( isgoodargs && exprarg > 0 /* good expression on command line */
10040: && infilearg <= 0 ) /* and not given in input file */
10041: if ( !isquery /* no conflict if no query_string */
10042: || nswitches > 0 ) /* explicit -switch(es) also given */
10043: { strncpy(expression,argv[exprarg],16384); /*expression from command-line*/
10044: expression[16384] = '\000'; /* make sure it's null terminated */
10045: isquery = 0; } /* and not from a query_string */
10046: /* ---
10047: * or read expression from input file
10048: * ---------------------------------- */
10049: if ( isgoodargs && infilearg > 0 ) /* have a good -f arg */
10050: {
10051: FILE *infile = fopen(argv[infilearg],"r"); /* open input file for read */
10052: if ( infile != (FILE *)NULL ) /* opened input file successfully */
10053: { char instring[2049]; /* line from file */
10054: isquery = 0; /* file input, not a query_string */
10055: *expression = '\000'; /* start expresion as empty string */
10056: while ( fgets(instring,2048,infile) != (char *)NULL ) /* read till eof*/
10057: strcat(expression,instring); /* concat line to end of expression*/
10058: fclose ( infile ); } /*close input file after reading expression*/
10059: } /* --- end-of-if(infilearg>0) --- */
10060: } /* --- end-of-if(!isquery) --- */
10061: /* ---
10062: * check for <form> input
10063: * ---------------------- */
10064: if ( isquery ) /* must be <form method="get"> */
10065: if ( !memcmp(expression,"formdata",8) ) /*must be <input name="formdata"> */
10066: { char *delim=strchr(expression,'='); /* find equal following formdata */
10067: if ( delim != (char *)NULL ) /* found unescaped equal sign */
10068: strcpy(expression,delim+1); /* so shift name= out of expression*/
10069: while ( (delim=strchr(expression,'+')) != NULL ) /*unescaped plus sign*/
10070: *delim = ' '; /* is "shorthand" for blank space */
10071: /*unescape_url(expression,1);*/ /* convert unescaped %xx's to chars */
10072: unescape_url(expression,0); /* convert all %xx's to chars */
10073: unescape_url(expression,0); /* repeat */
10074: msglevel = FORMLEVEL; /* msglevel for forms */
10075: isformdata = 1; } /* set flag to signal form data */
10076: else /* --- query, but not <form> input --- */
10077: unescape_url(expression,0); /* convert _all_ %xx's to chars */
10078: /* ---
10079: * check queries for embedded prefixes signalling special processing
10080: * ----------------------------------------------------------------- */
10081: if ( isquery ) /* only check queries */
10082: {
10083: /* --- check for msglevel=###$ prefix --- */
10084: if ( !memcmp(expression,"msglevel=",9) ) /* query has msglevel prefix */
10085: { char *delim=strchr(expression,'$'); /* find $ delim following msglevel*/
10086: if ( delim != (char *)NULL ) /* check that we found delim */
10087: { *delim = '\000'; /* replace delim with null */
10088: if ( seclevel <= 9 ) /* permit msglevel specification */
10089: msglevel = atoi(expression+9); /* interpret ### in msglevel###$ */
10090: strcpy(expression,delim+1); } } /* shift out prefix and delim */
10091: /* --- next check for logfile=xxx$ prefix (must follow msglevel) --- */
10092: if ( !memcmp(expression,"logfile=",8) ) /* query has logfile= prefix */
10093: { char *delim=strchr(expression,'$'); /* find $ delim following logfile=*/
10094: if ( delim != (char *)NULL ) /* check that we found delim */
10095: { *delim = '\000'; /* replace delim with null */
10096: if ( seclevel <= 3 ) /* permit logfile specification */
10097: strcpy(logfile,expression+8); /* interpret xxx in logfile=xxx$ */
10098: strcpy(expression,delim+1); } } /* shift out prefix and delim */
10099: } /* --- end-of-if(isquery) --- */
10100: /* ---
10101: * log query (e.g., for debugging)
10102: * ------------------------------- */
10103: if ( isquery ) /* only log query_string's */
10104: if ( msglevel >= LOGLEVEL /* check if logging */
10105: && seclevel <= 5 ) /* and if logging permitted */
10106: if ( logfile != NULL ) /* if a logfile is given */
10107: if ( *logfile != '\000' ) /*and if it's not an empty string*/
10108: if ( (msgfp=fopen(logfile,"a")) /* open logfile for append */
10109: != NULL ) /* ignore logging if can't open */
10110: {
10111: /* --- default logging --- */
10112: logger(msgfp,msglevel,expression,mimelog); /* log query */
10113: /* --- additional debug logging (argv and environment) --- */
10114: if ( msglevel >= 9 ) /* log environment */
10115: { int i; /*char name[999],*value;*/
10116: fprintf(msgfp,"Command-line arguments...\n");
10117: if ( argc < 1 ) /* no command-line args */
10118: fprintf(msgfp," ...argc=%d, no argv[] variables\n",argc);
10119: else
10120: for ( i=0; i<argc; i++ ) /* display all argv[]'s */
10121: fprintf(msgfp," argv[%d] = \"%s\"\n",i,argv[i]);
10122: #ifdef DUMPENVP /* char *envp[] available for dump */
10123: fprintf(msgfp,"Environment variables (using envp[])...\n");
10124: if ( envp == (char **)NULL ) /* envp not provided */
10125: fprintf(msgfp," ...envp[] environment variables not available\n");
10126: else
10127: for ( i=0; ; i++ ) /* display all envp[]'s */
10128: if ( envp[i] == (char *)NULL ) break;
10129: else fprintf(msgfp," envp[%d] = \"%s\"\n",i,envp[i]);
10130: #endif /* --- DUMPENVP ---*/
10131: #ifdef DUMPENVIRON /* skip what should be redundant output */
10132: fprintf(msgfp,"Environment variables (using environ)...\n");
10133: if ( environ == (char **)NULL ) /* environ not provided */
10134: fprintf(msgfp," ...extern environ variables not available\n");
10135: else
10136: for ( i=0; ; i++ ) /*display environ[] and getenv()'s*/
10137: if ( environ[i] == (char *)NULL ) break;
10138: else {
10139: strcpy(name,environ[i]); /* set up name for getenv() arg */
10140: if ( (value=strchr(name,'=')) != NULL ) /* = delimits name */
10141: { *value = '\000'; /* got it, so null-terminate name */
10142: value = getenv(name); } /* and look up name using getenv() */
10143: else strcpy(name,"NULL"); /* missing = delim in environ[i] */
10144: fprintf(msgfp,"environ[%d]: \"%s\"\n\tgetenv(%s) = \"%s\"\n",
10145: i,environ[i],name,(value==NULL?"NULL":value));
10146: } /* --- end-of-if/else --- */
10147: #endif /* --- DUMPENVIRON ---*/
10148: } /* --- end-of-if(msglevel>=9) --- */
10149: /* --- close log file if no longer needed --- */
10150: if ( msglevel < DBGLEVEL ) /* logging, but not debugging */
10151: { fprintf(msgfp,"%s\n",dashes); /* so log separator line, */
10152: fclose(msgfp); /* close logfile immediately, */
10153: msgfp = NULL; } /* and reset msgfp pointer */
10154: else
10155: isqlogging = 1; /* set query logging flag */
10156: } /* --- end-of-if(msglevel>=LOGLEVEL) --- */
10157: else /* couldn't open logfile */
10158: msglevel = 0; /* can't emit messages */
10159: /* ---
10160: * prepend prefix to submitted expression
10161: * -------------------------------------- */
10162: if ( 1 || isquery ) /* queries or command-line */
10163: if ( *exprprefix != '\000' ) /* we have a prefix string */
10164: { int npref = strlen(exprprefix); /* #chars in prefix */
10165: memmove(expression+npref+1,expression,strlen(expression)+1); /*make room*/
10166: memcpy(expression,exprprefix,npref); /* copy prefix into expression */
10167: expression[npref] = '{'; /* followed by { */
10168: strcat(expression,"}"); } /* and terminating } to balance { */
10169: /* ---
10170: * check if http_referer is allowed to use this image
10171: * -------------------------------------------------- */
10172: if ( isquery ) /* not relevant if "interactive" */
10173: if ( referer != NULL ) /* nor if compiled w/o -DREFERER= */
10174: if ( strcmp(referer,"month") != 0 ) /* nor if it's *only* "month" */
10175: if ( http_referer != NULL ) /* nor if called "standalone" */
10176: if ( !isstrstr(http_referer,referer,0) ) /* invalid http_referer */
10177: { expression = invalid_referer_msg; /* so give user error message */
10178: isinvalidreferer = 1; } /* and signal invalid referer */
10179: /* ---
10180: * check if referer contains "month" signal
10181: * ---------------------------------------- */
10182: if ( isquery ) /* not relevant if "interactive" */
10183: if ( referer != NULL ) /* nor if compiled w/o -DREFERER= */
10184: if ( !isinvalidreferer ) /* nor if already invalid referer */
10185: if ( strstr(referer,"month") != NULL ) /* month check requested */
10186: if ( !ismonth(progname) ) /* not executed as mimetexJan-Dec */
10187: { expression = invalid_referer_msg; /* so give user error message */
10188: isinvalidreferer = 1; } /* and signal invalid referer */
10189: /* ---
10190: * check if http_referer is to be denied access
10191: * -------------------------------------------- */
10192: if ( isquery ) /* not relevant if "interactive" */
10193: if ( !isinvalidreferer ) /* nor if already invalid referer */
10194: { int iref=0, msgnum=(-999); /* denyreferer index, message# */
10195: for ( iref=0; msgnum<0; iref++ ) { /* run through denyreferer[] table */
10196: char *deny = denyreferer[iref].referer; /* referer to be denied */
10197: if ( deny == NULL ) break; /* null signals end-of-table */
10198: if ( msglevel>=999 && msgfp!=NULL ) /* debugging */
10199: {fprintf(msgfp,"main> invalid iref=%d: deny=%s http_referer=%s\n",
10200: iref,deny,(http_referer==NULL?"null":http_referer)); fflush(msgfp);}
10201: if ( *deny == '\000' ) /* signal to check for no referer */
10202: { if ( http_referer == NULL ) /* http_referer not supplied */
10203: msgnum = denyreferer[iref].msgnum; } /* so set message# */
10204: else /* have referer to check for */
10205: if ( http_referer != NULL ) /* and have referer to be checked */
10206: if ( isstrstr(http_referer,deny,0) ) /* invalid http_referer */
10207: msgnum = denyreferer[iref].msgnum; /* so set message# */
10208: } /* --- end-of-for(iref) --- */
10209: if ( msgnum >= 0 ) /* deny access to this referer */
10210: { if ( msgnum > maxmsgnum ) msgnum = 0; /* keep index within bounds */
10211: expression = msgtable[msgnum]; /* set user error message */
10212: isinvalidreferer = 1; } /* and signal invalid referer */
10213: } /* --- end-of-if(!isinvalidreferer) --- */
10214: /* --- also check maximum query_string length if no http_referer given --- */
10215: if ( isquery ) /* not relevant if "interactive" */
10216: if ( !isinvalidreferer ) /* nor if already invalid referer */
10217: if ( !ishttpreferer ) /* no http_referer supplied */
10218: if ( strlen(expression) > norefmaxlen ) /* query_string too long */
10219: { expression = invalid_referer_msg; /* set invalid http_referer message*/
10220: isinvalidreferer = 1; } /* and signal invalid referer */
10221: /* ---
10222: * check for image caching
10223: * ----------------------- */
10224: if ( strstr(expression,"\\counter") != NULL /* can't cache \counter{} */
10225: || strstr(expression,"\\input") != NULL /* can't cache \input{} */
10226: || strstr(expression,"\\nocach") != NULL /* no caching requested */
10227: ) { iscaching = 0; /* so turn caching off */
10228: maxage = 2; } /* and set max-age to two seconds */
10229: if ( isquery ) /* don't cache command-line images */
10230: if ( iscaching ) /* image caching enabled */
10231: {
10232: /* --- set up path to cached image file --- */
10233: char *md5hash = md5str(expression); /* md5 hash of expression */
10234: if ( md5hash == NULL ) /* failed for some reason */
10235: iscaching = 0; /* so turn off caching */
10236: else
10237: {
10238: strcpy(cachefile,cachepath); /* start with (relative) path */
10239: strcat(cachefile,md5hash); /* add md5 hash of expression */
10240: strcat(cachefile,".gif"); /* finish with .gif extension */
10241: gif_outfile = cachefile; /* signal GIF_Create() to cache */
10242: /* --- (always) emit mime content-type line --- */
10243: fprintf( stdout, "Cache-Control: max-age=%d\n",maxage );
10244: fprintf( stdout, "Content-type: image/gif\n\n" );
10245: /* --- emit cached image if it already exists --- */
10246: if ( emitcache(cachefile) > 0 ) /* cached image emitted */
10247: goto end_of_job; /* so nothing else to do */
10248: /* --- log caching request --- */
10249: if ( msglevel >= 1 /* check if logging */
10250: /*&& seclevel <= 5*/ ) /* and if logging permitted */
10251: if ( cachelog != NULL ) /* if a logfile is given */
10252: if ( *cachelog != '\000' ) /*and if it's not an empty string*/
10253: { char filename[256]; /* construct cachepath/cachelog */
10254: FILE *filefp=NULL; /* fopen(filename) */
10255: strcpy(filename,cachepath); /* start with (relative) path */
10256: strcat(filename,cachelog); /* add cache log filename */
10257: if ( (filefp=fopen(filename,"a")) /* open cache logfile for append */
10258: != NULL ) /* ignore logging if can't open */
10259: { int isreflogged = 0; /* set true if http_referer logged */
10260: fprintf(filefp,"%s %s\n", /* timestamp, md5 file */
10261: timestamp(),cachefile+strlen(cachepath)); /* (path not shown) */
10262: fprintf(filefp,"%s\n",expression); /* expression in filename */
10263: if ( http_referer != NULL ) /* show referer if we have one */
10264: if ( *http_referer != '\000' ) /* and if not an empty string*/
10265: { int loglen = strlen(dashes); /* #chars on line in log file*/
10266: char *refp = http_referer; /* line to be printed */
10267: isreflogged = 1; /* signal http_referer logged*/
10268: while ( 1 ) { /* printed in parts if needed*/
10269: fprintf(filefp,"%.*s\n",loglen,refp); /* print a part */
10270: if ( strlen(refp) <= loglen ) break; /* no more parts */
10271: refp += loglen; } } /* bump ptr to next part */
10272: if ( !isreflogged ) /* http_referer not logged */
10273: fprintf(filefp,"http://none\n"); /* so log dummy referer line */
10274: fprintf(filefp,"%s\n",dashes); /* separator line */
10275: fclose(filefp); } /* close logfile immediately */
10276: } /* --- end-of-if(cachelog!=NULL) --- */
10277: } /* --- end-of-if/else(md5hash==NULL) --- */
10278: } /* --- end-of-if(iscaching) --- */
10279: /* ---
10280: * emit copyright, gnu/gpl notice (if "interactive")
10281: * ------------------------------------------------- */
10282: if ( !isdumpimage ) /* don't mix ascii with image dump */
10283: if ( (!isquery||isqlogging) && msgfp!=NULL ) /* called from command line */
10284: fprintf(msgfp,"%s\n",copyright); /* display copyright, gnu/gpl info */
10285: /* -------------------------------------------------------------------------
10286: rasterize expression and put a border around it
10287: -------------------------------------------------------------------------- */
10288: /* --- preprocess expression, converting LaTeX constructs for mimeTeX --- */
10289: expression = mimeprep(expression); /* preprocess expression */
10290: /* --- double-check that we actually have an expression to rasterize --- */
10291: if ( expression == NULL ) /* nothing to rasterize */
10292: { if ( (!isquery||isqlogging) && msgfp!=NULL ) /*emit error if not a query*/
10293: fprintf(msgfp,"No expression to rasterize\n");
10294: goto end_of_job; } /* and then quit */
10295: /* --- rasterize expression --- */
10296: if ( (sp = rasterize(expression,size)) == NULL ) /* failed to rasterize */
10297: { if ( (!isquery||isqlogging) && msgfp!=NULL ) /*emit error if not a query*/
10298: fprintf(msgfp,"Failed to rasterize %s\n",expression);
10299: if ( isquery ) sp = rasterize( /* or emit error raster if query */
10300: "\\red\\rm~\\fbox{mimeTeX~failed~to~render\\\\your~expression}",1);
10301: if ( sp == NULL ) goto end_of_job; } /* re-check for failure */
10302: /* ---no border requested, but this adjusts width to multiple of 8 bits--- */
10303: if ( issupersampling ) /* no border needed for gifs */
10304: bp = sp->image; /* so just extract pixel map */
10305: else /* for mime xbitmaps must have... */
10306: bp = border_raster(sp->image,0,0,0,1); /* image width multiple of 8 bits */
10307: sp->image = bitmap_raster = bp; /* global copy for gif,png output */
10308: /* -------------------------------------------------------------------------
10309: generate anti-aliased bytemap from (bordered) bitmap
10310: -------------------------------------------------------------------------- */
10311: if ( isaa ) /* we want anti-aliased bitmap */
10312: {
10313: /* ---
10314: * allocate bytemap and colormap as per width*height of bitmap
10315: * ----------------------------------------------------------- */
10316: int nbytes = (bp->width)*(bp->height); /*#bytes needed in byte,colormap*/
10317: if ( isss ) /* anti-aliasing by supersampling */
10318: bytemap_raster = (intbyte *)(bitmap_raster->pixmap); /*bytemap in raster*/
10319: else /* need to allocate bytemap */
10320: if ( aaalgorithm == 0 ) /* anti-aliasing not wanted */
10321: isaa = 0; /* so signal no anti-aliasing */
10322: else /* anti-aliasing wanted */
10323: if ( (bytemap_raster = (intbyte *)malloc(nbytes)) /* malloc bytemap */
10324: == NULL ) isaa = 0; /* reset flag if malloc failed */
10325: if ( isaa ) /* have bytemap, so... */
10326: if ( (colormap_raster = (intbyte *)malloc(nbytes)) /* malloc colormap */
10327: == NULL ) isaa = 0; /* reset flag if malloc failed */
10328: /* ---
10329: * now generate anti-aliased bytemap and colormap from bitmap
10330: * ---------------------------------------------------------- */
10331: if ( isaa ) /*re-check that we're anti-aliasing*/
10332: {
10333: /* ---
10334: * select anti-aliasing algorithm
10335: * ------------------------------ */
10336: if ( !isss ) /* generate bytemap for lowpass */
10337: if ( aaalgorithm == 1 ) /* 1 for aalowpass() */
10338: { if ( aalowpass(bp,bytemap_raster,grayscale) /* my lowpass filter */
10339: == 0 ) isaa = 0; } /*failed, so turn off anti-aliasing*/
10340: else /* or 2 for aapnm() */
10341: if ( aaalgorithm == 2 ) /*2 for netpbm pnmalias.c algorithm*/
10342: { if ( aapnm(bp,bytemap_raster,grayscale) /* pnmalias.c filter */
10343: == 0 ) isaa = 0; } /*failed, so turn off anti-aliasing*/
10344: else isaa = 0; /* unrecognized algorithm */
10345: /* ---
10346: * finally, generate colors and colormap
10347: * ------------------------------------- */
10348: if ( isaa ) { /* we have bytemap_raster */
10349: ncolors = aacolormap(bytemap_raster,nbytes,colors,colormap_raster);
10350: if ( ncolors < 2 ) /* failed */
10351: { isaa = 0; /* so turn off anti-aliasing */
10352: ncolors = 2; } /* and reset for black&white */
10353: } /* --- end-of-if(isaa) --- */
10354: } /* --- end-of-if(isaa) --- */
10355: } /* --- end-of-if(isaa) --- */
10356: /* -------------------------------------------------------------------------
10357: display results on msgfp if called from command line (usually for testing)
10358: -------------------------------------------------------------------------- */
10359: if ( (!isquery||isqlogging) || msglevel >= 99 ) /*command line or debuging*/
10360: if ( !isdumpimage ) /* don't mix ascii with image dump */
10361: {
10362: /* ---
10363: * display ascii image of rasterize()'s rasterized bitmap
10364: * ------------------------------------------------------ */
10365: if ( !isss ) /* no bitmap for supersampling */
10366: { fprintf(msgfp,"\nAscii dump of bitmap image...\n");
10367: type_raster(bp,msgfp); } /* emit ascii image of raster */
10368: /* ---
10369: * display anti-aliasing results applied to rasterized bitmap
10370: * ---------------------------------------------------------- */
10371: if ( isaa ) /* if anti-aliasing applied */
10372: {
10373: int igray; /* colors[] index */
10374: /* --- anti-aliased bytemap image --- */
10375: if ( msgfp!=NULL && msglevel>=9 ) /* don't usually emit raw bytemap */
10376: { fprintf(msgfp,"\nHex dump of anti-aliased bytemap, " /*emit bytemap*/
10377: "asterisks denote \"black\" bytes (value=%d)...\n",grayscale-1);
10378: type_bytemap(bytemap_raster,grayscale,bp->width,bp->height,msgfp); }
10379: /* --- colormap image --- */
10380: fprintf(msgfp,"\nHex dump of colormap indexes, " /* emit colormap */
10381: "asterisks denote \"black\" bytes (index=%d)...\n",ncolors-1);
10382: type_bytemap(colormap_raster,ncolors,bp->width,bp->height,msgfp);
10383: /* --- rgb values corresponding to colormap indexes */
10384: fprintf(msgfp,"\nThe %d colormap indexes denote rgb values...",ncolors);
10385: for ( igray=0; igray<ncolors; igray++ ) /* show colors[] values */
10386: fprintf(msgfp,"%s%2x-->%3d", (igray%5?" ":"\n"),
10387: igray,(int)(colors[ncolors-1]-colors[igray]));
10388: fprintf(msgfp,"\n"); /* always needs a final newline */
10389: } /* --- end-of-if(isaa) --- */
10390: } /* --- end-of-if(!isquery||msglevel>=9) --- */
10391: /* -------------------------------------------------------------------------
10392: emit xbitmap or gif image, and exit
10393: -------------------------------------------------------------------------- */
10394: if ( isquery /* called from browser (usual) */
10395: || isdumpimage /* or to emit dump of image */
10396: || msglevel >= 99 ) /* or for debugging */
10397: {
10398: int igray = 0; /* grayscale index */
10399: #if defined(GIF) /* compiled to emit gif */
10400: /* ------------------------------------------------------------------------
10401: emit GIF image
10402: ------------------------------------------------------------------------- */
10403: /* --- emit mime content-type line --- */
10404: if ( !isdumpimage /* don't mix ascii with image dump */
10405: && !iscaching ) /* already emitted if caching */
10406: { fprintf( stdout, "Cache-Control: max-age=%d\n",maxage );
10407: /*fprintf( stdout, "Expires: Fri, 31 Oct 2003 23:59:59 GMT\n" );*/
10408: /*fprintf( stdout, "Last-Modified: Wed, 15 Oct 2003 01:01:01 GMT\n" );*/
10409: fprintf( stdout, "Content-type: image/gif\n\n" ); }
10410: /* --- initialize gifsave library and colors --- */
10411: if ( msgfp!=NULL && msglevel>=999 )
10412: fprintf(msgfp,"main> calling GIF_Create(*,%d,%d,%d,8)\n",
10413: bp->width,bp->height,ncolors);
10414: while ( 1 ) /* init gifsave lib, and retry if caching fails */
10415: { int status = GIF_Create(gif_outfile, bp->width,bp->height, ncolors, 8);
10416: if ( status == 0 ) break; /* continue if succeeded */
10417: if ( iscaching == 0 ) goto end_of_job; /* quit if failed */
10418: iscaching = 0; /* retry without cache file */
10419: gif_outfile = (char *)NULL; } /* emit images to stdout */
10420: GIF_SetColor(0,bgred,bggreen,bgblue); /* background white if all 255 */
10421: if ( !isaa ) /* just b&w if not anti-aliased */
10422: { GIF_SetColor(1,fgred,fggreen,fgblue); /* foreground black if all 0 */
10423: colors[0]='\000'; colors[1]='\001'; } /* and set 2 b&w color indexes */
10424: else /* set grayscales for anti-aliasing */
10425: /* --- anti-aliased, so call GIF_SetColor() for each colors[] --- */
10426: for ( igray=1; igray<ncolors; igray++ ) /* for colors[] values */
10427: {
10428: /*--- gfrac goes from 0 to 1.0, as igray goes from 0 to ncolors-1 ---*/
10429: double gfrac = ((double)colors[igray])/((double)colors[ncolors-1]);
10430: /* --- r,g,b components go from background to foreground color --- */
10431: int red = iround(((double)bgred) +gfrac*((double)(fgred-bgred))),
10432: green= iround(((double)bggreen)+gfrac*((double)(fggreen-bggreen))),
10433: blue = iround(((double)bgblue) +gfrac*((double)(fgblue-bgblue)));
10434: /* --- set color index number igray to rgb values gray,gray,gray --- */
10435: GIF_SetColor(igray, red,green,blue); /*set gray,grayer,...,0=black*/
10436: } /* --- end-of-for(igray) --- */
10437: /* --- set gif color#0 (background) transparent --- */
10438: if ( istransparent ) /* transparent background wanted */
10439: GIF_SetTransparent(0); /* set transparent background */
10440: if (msgfp!=NULL && msglevel>=9) fflush(msgfp); /*flush debugging output*/
10441: /* --- emit compressed gif image (to stdout or cache file) --- */
10442: GIF_CompressImage(0, 0, -1, -1, GetPixel); /* emit gif */
10443: GIF_Close(); /* close file */
10444: /* --- may need to emit image from cached file --- */
10445: if ( isquery && iscaching ) /* caching enabled */
10446: emitcache(cachefile); /* cached image (hopefully) emitted*/
10447: #else
10448: /* ------------------------------------------------------------------------
10449: emit mime XBITMAP image
10450: ------------------------------------------------------------------------- */
10451: xbitmap_raster(bp,stdout); /* default emits mime xbitmap */
10452: #endif
10453: } /* --- end-of-if(isquery) --- */
10454: /* --- exit --- */
10455: end_of_job:
10456: if ( bytemap_raster != NULL ) free(bytemap_raster); /*free bytemap_raster*/
10457: if (colormap_raster != NULL )free(colormap_raster); /*and colormap_raster*/
10458: if ( msgfp != NULL /* have message/log file open */
10459: && msgfp != stdout ) /* and it's not stdout */
10460: { fprintf(msgfp,"mimeTeX> successful end-of-job at %s\n",timestamp());
10461: fprintf(msgfp,"%s\n",dashes); /* so log separator line */
10462: fclose(msgfp); } /* and close logfile */
10463: exit ( 0 );
10464: } /* --- end-of-function main() --- */
10465:
10466: /* ==========================================================================
10467: * Function: isstrstr ( char *string, char *snippets, int iscase )
10468: * Purpose: determine whether any substring of 'string'
10469: * matches any of the comma-separated list of 'snippets',
10470: * ignoring case if iscase=0.
10471: * --------------------------------------------------------------------------
10472: * Arguments: string (I) char * containing null-terminated
10473: * string that will be searched for
10474: * any one of the specified snippets
10475: * snippets (I) char * containing null-terminated,
10476: * comma-separated list of snippets
10477: * to be searched for in string
10478: * iscase (I) int containing 0 for case-insensitive
10479: * comparisons, or 1 for case-sensitive
10480: * --------------------------------------------------------------------------
10481: * Returns: ( int ) 1 if any snippet is a substring of
10482: * string, 0 if not
10483: * --------------------------------------------------------------------------
10484: * Notes: o
10485: * ======================================================================= */
10486: /* --- entry point --- */
10487: int isstrstr ( char *string, char *snippets, int iscase )
10488: {
10489: /* -------------------------------------------------------------------------
10490: Allocations and Declarations
10491: -------------------------------------------------------------------------- */
10492: int status = 0; /*1 if any snippet found in string*/
10493: char snip[99], *snipptr = snippets, /* munge through each snippet */
10494: delim = ',', *delimptr = NULL; /* separated by delim's */
10495: char stringcp[999], *cp = stringcp; /*maybe lowercased copy of string*/
10496: /* -------------------------------------------------------------------------
10497: initialization
10498: -------------------------------------------------------------------------- */
10499: /* --- arg check --- */
10500: if ( string==NULL || snippets==NULL ) goto end_of_job; /* missing arg */
10501: if ( *string=='\000' || *snippets=='\000' ) goto end_of_job; /* empty arg */
10502: /* --- copy string and lowercase it if case-insensitive --- */
10503: strcpy(stringcp,string); /* local copy of string */
10504: if ( !iscase ) /* want case-insensitive compares */
10505: for ( cp=stringcp; *cp != '\000'; cp++ ) /* so for each string char */
10506: if ( isupper(*cp) ) *cp = tolower(*cp); /*lowercase any uppercase chars*/
10507: /* -------------------------------------------------------------------------
10508: extract each snippet and see if it's a substring of string
10509: -------------------------------------------------------------------------- */
10510: while ( snipptr != NULL ) /* while we still have snippets */
10511: {
10512: /* --- extract next snippet --- */
10513: if ( (delimptr = strchr(snipptr,delim)) /* locate next comma delim */
10514: == NULL ) /*not found following last snippet*/
10515: { strcpy(snip,snipptr); /* local copy of last snippet */
10516: snipptr = NULL; } /* signal end-of-string */
10517: else /* snippet ends just before delim */
10518: { int sniplen = (int)(delimptr-snipptr) - 1; /* #chars in snippet */
10519: memcpy(snip,snipptr,sniplen); /* local copy of snippet chars */
10520: snip[sniplen] = '\000'; /* null-terminated snippet */
10521: snipptr = delimptr + 1; } /* next snippet starts after delim */
10522: /* --- lowercase snippet if case-insensitive --- */
10523: if ( !iscase ) /* want case-insensitive compares */
10524: for ( cp=snip; *cp != '\000'; cp++ ) /* so for each snippet char */
10525: if ( isupper(*cp) ) *cp=tolower(*cp); /*lowercase any uppercase chars*/
10526: /* --- check if snippet in string --- */
10527: if ( strstr(stringcp,snip) != NULL ) /* found snippet in string */
10528: { status = 1; /* so reset return status */
10529: break; } /* no need to check any further */
10530: } /* --- end-of-while(*snipptr!=0) --- */
10531: end_of_job: return ( status ); /*1 if snippet found in list, else 0*/
10532: } /* --- end-of-function isstrstr() --- */
10533:
10534: /* ==========================================================================
10535: * Function: ismonth ( char *month )
10536: * Purpose: returns 1 if month contains current month "jan"..."dec".
10537: * --------------------------------------------------------------------------
10538: * Arguments: month (I) char * containing null-terminated string
10539: * in which "jan"..."dec" is (putatively)
10540: * contained as a substring.
10541: * --------------------------------------------------------------------------
10542: * Returns: ( int ) 1 if month contains current month,
10543: * 0 otherwise
10544: * --------------------------------------------------------------------------
10545: * Notes: o There's a three day "grace period", e.g., Dec 3 mtaches Nov.
10546: * ======================================================================= */
10547: /* --- entry point --- */
10548: int ismonth ( char *month )
10549: {
10550: /* -------------------------------------------------------------------------
10551: Allocations and Declarations
10552: -------------------------------------------------------------------------- */
10553: int isokay = 0; /*1 if month contains current month*/
10554: /*long time_val = 0L;*/ /* binary value returned by time() */
10555: time_t time_val = (time_t)(0); /* binary value returned by time() */
10556: struct tm *tmstruct=(struct tm *)NULL, *localtime(); /* interpret time_val */
10557: int imonth, mday; /* current month 1-12 and day 1-31 */
10558: int ngrace = 3; /* grace period */
10559: char lcmonth[128]="\000"; int i=0; /* lowercase month */
10560: static char *months[] = /* month must contain current one */
10561: {"dec","jan","feb","mar","apr","may","jun",
10562: "jul","aug","sep","oct","nov","dec","jan"};
10563: /* -------------------------------------------------------------------------
10564: get current date:time info, and check month
10565: -------------------------------------------------------------------------- */
10566: /* --- lowercase input month --- */
10567: if ( month != NULL ) /* check that we got input */
10568: for ( i=0; i<120 && *month!='\000'; i++,month++ ) /* go thru month chars */
10569: lcmonth[i] = tolower(*month); /* lowerase each char in month */
10570: if ( i < 2 ) goto end_of_job; /* must be invalid input */
10571: lcmonth[i] = '\000'; /* null-terminate lcmonth[] */
10572: /* --- get current date:time --- */
10573: time((time_t *)(&time_val)); /* get date and time */
10574: tmstruct = localtime((time_t *)(&time_val)); /* interpret time_val */
10575: /* --- month and day --- */
10576: imonth = 1 + (int)(tmstruct->tm_mon); /* 1=jan ... 12=dec */
10577: mday = (int)(tmstruct->tm_mday); /* 1-31 */
10578: if ( imonth<1 || imonth>12 /* quit if month out-of-range */
10579: || mday<0 || mday>31 ) goto end_of_job; /* or date out of range */
10580: /* --- check input month against current date --- */
10581: if ( strstr(lcmonth,months[imonth]) != NULL ) isokay = 1; /* current month */
10582: if ( mday <= ngrace ) /* 1-3 within grace period */
10583: if ( strstr(lcmonth,months[imonth-1]) != NULL ) isokay = 1; /* last month */
10584: if ( mday >= 31-ngrace ) /* 28-31 within grace period */
10585: if ( strstr(lcmonth,months[imonth+1]) != NULL ) isokay = 1; /* next month */
10586: end_of_job:
10587: return ( isokay ); /*1 if month contains current month*/
10588: } /* --- end-of-function ismonth() --- */
10589:
10590: /* ==========================================================================
10591: * Functions: int unescape_url ( char *url, int isescape )
10592: * char x2c ( char *what )
10593: * Purpose: unescape_url replaces 3-character sequences %xx in url
10594: * with the single character represented by hex xx.
10595: * x2c returns the single character represented by hex xx
10596: * passed as a 2-character sequence in what.
10597: * --------------------------------------------------------------------------
10598: * Arguments: url (I) char * containing null-terminated
10599: * string with embedded %xx sequences
10600: * to be converted.
10601: * isescape (I) int containing 1 to _not_ unescape
10602: * \% sequences (0 would be NCSA default)
10603: * what (I) char * whose first 2 characters are
10604: * interpreted as ascii representations
10605: * of hex digits.
10606: * --------------------------------------------------------------------------
10607: * Returns: ( int ) unescape_url always returns 0.
10608: * ( char ) x2c returns the single char
10609: * corresponding to hex xx passed in what.
10610: * --------------------------------------------------------------------------
10611: * Notes: o These two functions were taken verbatim from util.c in
10612: * ftp://ftp.ncsa.uiuc.edu/Web/httpd/Unix/ncsa_httpd/cgi/ncsa-default.tar.Z
10613: * o Not quite "verbatim" -- I added the "isescape logic" 4-Dec-03
10614: * so unescape_url() can be safely applied to input which may or
10615: * may not have been url-encoded.
10616: * ======================================================================= */
10617: /* --- entry point --- */
10618: int unescape_url(char *url, int isescape) {
10619: int x=0,y=0,prevescape=0,gotescape=0;
10620: char x2c();
10621: static char *hex="0123456789ABCDEFabcdef";
10622: for(;url[y];++x,++y) {
10623: gotescape = prevescape;
10624: prevescape = (url[x]=='\\');
10625: if((url[x] = url[y]) == '%')
10626: if(!isescape || !gotescape)
10627: if(isthischar(url[y+1],hex)
10628: && isthischar(url[y+2],hex))
10629: { url[x] = x2c(&url[y+1]);
10630: y+=2; }
10631: }
10632: url[x] = '\0';
10633: return 0;
10634: } /* --- end-of-function unescape_url() --- */
10635: /* --- entry point --- */
10636: char x2c(char *what) {
10637: char digit;
10638: digit = (what[0] >= 'A' ? ((what[0] & 0xdf) - 'A')+10 : (what[0] - '0'));
10639: digit *= 16;
10640: digit += (what[1] >= 'A' ? ((what[1] & 0xdf) - 'A')+10 : (what[1] - '0'));
10641: return(digit);
10642: } /* --- end-of-function x2c() --- */
10643:
10644: /* ==========================================================================
10645: * Function: logger ( fp, msglevel, message, logvars )
10646: * Purpose: Logs the environment variables specified in logvars
10647: * to fp if their msglevel is >= the passed msglevel.
10648: * --------------------------------------------------------------------------
10649: * Arguments: fp (I) FILE * to file containing log
10650: * msglevel (I) int containing logging message level
10651: * message (I) char * to optional message, or NULL
10652: * logvars (I) logdata * to array of environment variables
10653: * to be logged
10654: * --------------------------------------------------------------------------
10655: * Returns: ( int ) number of variables from logvars
10656: * that were actually logged
10657: * --------------------------------------------------------------------------
10658: * Notes: o
10659: * ======================================================================= */
10660: /* --- entry point --- */
10661: int logger ( FILE *fp, int msglevel, char *message, logdata *logvars )
10662: {
10663: /* -------------------------------------------------------------------------
10664: Allocations and Declarations
10665: -------------------------------------------------------------------------- */
10666: int ilog=0, nlogged=0; /* logvars[] index, #vars logged */
10667: char *timestamp(); /* timestamp logged */
10668: char *value = NULL; /* getenv(name) to be logged */
10669: /* -------------------------------------------------------------------------
10670: Log each variable
10671: -------------------------------------------------------------------------- */
10672: fprintf(fp,"%s\n",timestamp()); /* emit timestamp before first var */
10673: if ( message != NULL ) /* optional message supplied */
10674: fprintf(fp," MESSAGE = %s\n",message); /* emit caller-supplied message */
10675: if ( logvars != (logdata *)NULL ) /* have logvars */
10676: for ( ilog=0; logvars[ilog].name != NULL; ilog++ ) /* till end-of-table */
10677: if ( msglevel >= logvars[ilog].msglevel ) /* check msglevel for this var */
10678: if ( (value=getenv(logvars[ilog].name)) /* getenv(name) to be logged */
10679: != NULL ) /* check that name exists */
10680: {
10681: fprintf(fp," %s = %.*s\n", /* emit variable name = value */
10682: logvars[ilog].name,logvars[ilog].maxlen,value);
10683: nlogged++; /* bump #vars logged */
10684: } /* --- end-of-for(ilog) --- */
10685: return ( nlogged ); /* back to caller */
10686: } /* --- end-of-function logger() --- */
10687:
10688: /* ==========================================================================
10689: * Function: emitcache ( cachefile )
10690: * Purpose: dumps bytes from cachefile to stdout
10691: * --------------------------------------------------------------------------
10692: * Arguments: cachefile (I) pointer to null-terminated char string
10693: * containing full path to file to be dumped
10694: * --------------------------------------------------------------------------
10695: * Returns: ( int ) #bytes dumped (0 signals error)
10696: * --------------------------------------------------------------------------
10697: * Notes: o
10698: * ======================================================================= */
10699: /* --- entry point --- */
10700: int emitcache ( char *cachefile )
10701: {
10702: /* -------------------------------------------------------------------------
10703: Allocations and Declarations
10704: -------------------------------------------------------------------------- */
10705: FILE *cacheptr = fopen(cachefile,"rb"), /*open cachefile for binary read*/
10706: *emitptr = stdout; /* emit cachefile to stdout */
10707: unsigned char buffer[64]; /* characters from cachefile */
10708: int buflen = 32, /* #bytes we try to read from cache*/
10709: nread = 0, /* #bytes actually read */
10710: nbytes = 0; /* total #bytes emitted */
10711: /* -------------------------------------------------------------------------
10712: initialization
10713: -------------------------------------------------------------------------- */
10714: /* --- check that files opened okay --- */
10715: if ( cacheptr == (FILE *)NULL /* failed to open cachefile */
10716: || emitptr == (FILE *)NULL ) /* or failed to open emit file */
10717: goto end_of_job; /* so return 0 bytes to caller */
10718: /* --- set stdout to binary mode (for Windows) --- */
10719: /* emitptr = fdopen(STDOUT_FILENO,"wb"); */ /* doesn't work portably, */
10720: #ifdef WINDOWS /* so instead... */
10721: #ifdef HAVE_SETMODE /* prefer (non-portable) setmode() */
10722: if ( setmode ( fileno (stdout), O_BINARY) /* windows specific call */
10723: == -1 ) ; /* handle error */ /* sets stdout to binary mode */
10724: #else /* setmode() not available */
10725: #if 1
10726: freopen ("CON", "wb", stdout); /* freopen() stdout binary */
10727: #else
10728: stdout = fdopen (STDOUT_FILENO, "wb"); /* fdopen() stdout binary */
10729: #endif
10730: #endif
10731: #endif
10732: /* -------------------------------------------------------------------------
10733: emit bytes from cachefile
10734: -------------------------------------------------------------------------- */
10735: while ( 1 )
10736: {
10737: /* --- read bytes from cachefile --- */
10738: nread = fread(buffer,sizeof(unsigned char),buflen,cacheptr); /* read */
10739: if ( nread < 1 ) break; /* no bytes left in cachefile */
10740: /* --- write bytes to stdout --- */
10741: if ( fwrite(buffer,sizeof(unsigned char),nread,emitptr) /* write buffer */
10742: < nread) /* failed to write all bytes */
10743: { nbytes = 0; /* reset total count to 0 */
10744: goto end_of_job; } /* and signal error to caller */
10745: nbytes += nread; /* bump total #bytes emitted */
10746: if ( nread < buflen ) break; /* no bytes left in cachefile */
10747: } /* --- end-of-while(1) --- */
10748: end_of_job:
10749: if ( cacheptr != NULL ) fclose(cacheptr); /* close file if opened */
10750: return ( nbytes ); /* back with #bytes emitted */
10751: } /* --- end-of-function emitcache() --- */
10752:
10753: /* ==========================================================================
10754: * Function: md5str ( instr )
10755: * Purpose: returns null-terminated character string containing
10756: * md5 hash of instr (input string)
10757: * --------------------------------------------------------------------------
10758: * Arguments: instr (I) pointer to null-terminated char string
10759: * containing input string whose md5 hash
10760: * is desired
10761: * --------------------------------------------------------------------------
10762: * Returns: ( char * ) ptr to null-terminated 32-character
10763: * md5 hash of instr
10764: * --------------------------------------------------------------------------
10765: * Notes: o Other md5 library functions are included below.
10766: * They're all taken from Christophe Devine's code,
10767: * which (as of 04-Aug-2004) is available from
10768: * http://www.cr0.net:8040/code/crypto/md5/
10769: * o The P,F,S macros in the original code are replaced
10770: * by four functions P1()...P4() to accommodate a problem
10771: * with Compaq's vax/vms C compiler.
10772: * ======================================================================= */
10773: /* --- #include "md5.h" --- */
10774: #ifndef uint8
10775: #define uint8 unsigned char
10776: #endif
10777: #ifndef uint32
10778: #define uint32 unsigned long int
10779: #endif
10780: typedef struct
10781: { uint32 total[2];
10782: uint32 state[4];
10783: uint8 buffer[64];
10784: } md5_context;
10785: void md5_starts( md5_context *ctx );
10786: void md5_update( md5_context *ctx, uint8 *input, uint32 length );
10787: void md5_finish( md5_context *ctx, uint8 digest[16] );
10788: /* --- md5.h --- */
10789: #define GET_UINT32(n,b,i) \
10790: { (n) = ( (uint32) (b)[(i) ] ) \
10791: | ( (uint32) (b)[(i) + 1] << 8 ) \
10792: | ( (uint32) (b)[(i) + 2] << 16 ) \
10793: | ( (uint32) (b)[(i) + 3] << 24 ); }
10794: #define PUT_UINT32(n,b,i) \
10795: { (b)[(i) ] = (uint8) ( (n) ); \
10796: (b)[(i) + 1] = (uint8) ( (n) >> 8 ); \
10797: (b)[(i) + 2] = (uint8) ( (n) >> 16 ); \
10798: (b)[(i) + 3] = (uint8) ( (n) >> 24 ); }
10799: /* --- P,S,F macros defined as functions --- */
10800: void P1(uint32 *X,uint32 *a,uint32 b,uint32 c,uint32 d,int k,int s,uint32 t)
10801: { *a += (uint32)(d ^ (b & (c ^ d))) + X[k] + t;
10802: *a = ((*a<<s) | ((*a & 0xFFFFFFFF) >> (32-s))) + b;
10803: return; }
10804: void P2(uint32 *X,uint32 *a,uint32 b,uint32 c,uint32 d,int k,int s,uint32 t)
10805: { *a += (uint32)(c ^ (d & (b ^ c))) + X[k] + t;
10806: *a = ((*a<<s) | ((*a & 0xFFFFFFFF) >> (32-s))) + b;
10807: return; }
10808: void P3(uint32 *X,uint32 *a,uint32 b,uint32 c,uint32 d,int k,int s,uint32 t)
10809: { *a += (uint32)(b ^ c ^ d) + X[k] + t;
10810: *a = ((*a<<s) | ((*a & 0xFFFFFFFF) >> (32-s))) + b;
10811: return; }
10812: void P4(uint32 *X,uint32 *a,uint32 b,uint32 c,uint32 d,int k,int s,uint32 t)
10813: { *a += (uint32)(c ^ (b | ~d)) + X[k] + t;
10814: *a = ((*a<<s) | ((*a & 0xFFFFFFFF) >> (32-s))) + b;
10815: return; }
10816:
10817: /* --- entry point (this one little stub written by me)--- */
10818: char *md5str( char *instr )
10819: { static char outstr[64];
10820: unsigned char md5sum[16];
10821: md5_context ctx;
10822: int j;
10823: md5_starts( &ctx );
10824: md5_update( &ctx, (uint8 *)instr, strlen(instr) );
10825: md5_finish( &ctx, md5sum );
10826: for( j=0; j<16; j++ )
10827: sprintf( outstr + j*2, "%02x", md5sum[j] );
10828: outstr[32] = '\000';
10829: return ( outstr ); }
10830:
10831: /* --- entry point (all md5 functions below by Christophe Devine) --- */
10832: void md5_starts( md5_context *ctx )
10833: { ctx->total[0] = 0;
10834: ctx->total[1] = 0;
10835: ctx->state[0] = 0x67452301;
10836: ctx->state[1] = 0xEFCDAB89;
10837: ctx->state[2] = 0x98BADCFE;
10838: ctx->state[3] = 0x10325476; }
10839:
10840: void md5_process( md5_context *ctx, uint8 data[64] )
10841: { uint32 X[16], A, B, C, D;
10842: GET_UINT32( X[0], data, 0 );
10843: GET_UINT32( X[1], data, 4 );
10844: GET_UINT32( X[2], data, 8 );
10845: GET_UINT32( X[3], data, 12 );
10846: GET_UINT32( X[4], data, 16 );
10847: GET_UINT32( X[5], data, 20 );
10848: GET_UINT32( X[6], data, 24 );
10849: GET_UINT32( X[7], data, 28 );
10850: GET_UINT32( X[8], data, 32 );
10851: GET_UINT32( X[9], data, 36 );
10852: GET_UINT32( X[10], data, 40 );
10853: GET_UINT32( X[11], data, 44 );
10854: GET_UINT32( X[12], data, 48 );
10855: GET_UINT32( X[13], data, 52 );
10856: GET_UINT32( X[14], data, 56 );
10857: GET_UINT32( X[15], data, 60 );
10858: A = ctx->state[0];
10859: B = ctx->state[1];
10860: C = ctx->state[2];
10861: D = ctx->state[3];
10862: P1( X, &A, B, C, D, 0, 7, 0xD76AA478 );
10863: P1( X, &D, A, B, C, 1, 12, 0xE8C7B756 );
10864: P1( X, &C, D, A, B, 2, 17, 0x242070DB );
10865: P1( X, &B, C, D, A, 3, 22, 0xC1BDCEEE );
10866: P1( X, &A, B, C, D, 4, 7, 0xF57C0FAF );
10867: P1( X, &D, A, B, C, 5, 12, 0x4787C62A );
10868: P1( X, &C, D, A, B, 6, 17, 0xA8304613 );
10869: P1( X, &B, C, D, A, 7, 22, 0xFD469501 );
10870: P1( X, &A, B, C, D, 8, 7, 0x698098D8 );
10871: P1( X, &D, A, B, C, 9, 12, 0x8B44F7AF );
10872: P1( X, &C, D, A, B, 10, 17, 0xFFFF5BB1 );
10873: P1( X, &B, C, D, A, 11, 22, 0x895CD7BE );
10874: P1( X, &A, B, C, D, 12, 7, 0x6B901122 );
10875: P1( X, &D, A, B, C, 13, 12, 0xFD987193 );
10876: P1( X, &C, D, A, B, 14, 17, 0xA679438E );
10877: P1( X, &B, C, D, A, 15, 22, 0x49B40821 );
10878: P2( X, &A, B, C, D, 1, 5, 0xF61E2562 );
10879: P2( X, &D, A, B, C, 6, 9, 0xC040B340 );
10880: P2( X, &C, D, A, B, 11, 14, 0x265E5A51 );
10881: P2( X, &B, C, D, A, 0, 20, 0xE9B6C7AA );
10882: P2( X, &A, B, C, D, 5, 5, 0xD62F105D );
10883: P2( X, &D, A, B, C, 10, 9, 0x02441453 );
10884: P2( X, &C, D, A, B, 15, 14, 0xD8A1E681 );
10885: P2( X, &B, C, D, A, 4, 20, 0xE7D3FBC8 );
10886: P2( X, &A, B, C, D, 9, 5, 0x21E1CDE6 );
10887: P2( X, &D, A, B, C, 14, 9, 0xC33707D6 );
10888: P2( X, &C, D, A, B, 3, 14, 0xF4D50D87 );
10889: P2( X, &B, C, D, A, 8, 20, 0x455A14ED );
10890: P2( X, &A, B, C, D, 13, 5, 0xA9E3E905 );
10891: P2( X, &D, A, B, C, 2, 9, 0xFCEFA3F8 );
10892: P2( X, &C, D, A, B, 7, 14, 0x676F02D9 );
10893: P2( X, &B, C, D, A, 12, 20, 0x8D2A4C8A );
10894: P3( X, &A, B, C, D, 5, 4, 0xFFFA3942 );
10895: P3( X, &D, A, B, C, 8, 11, 0x8771F681 );
10896: P3( X, &C, D, A, B, 11, 16, 0x6D9D6122 );
10897: P3( X, &B, C, D, A, 14, 23, 0xFDE5380C );
10898: P3( X, &A, B, C, D, 1, 4, 0xA4BEEA44 );
10899: P3( X, &D, A, B, C, 4, 11, 0x4BDECFA9 );
10900: P3( X, &C, D, A, B, 7, 16, 0xF6BB4B60 );
10901: P3( X, &B, C, D, A, 10, 23, 0xBEBFBC70 );
10902: P3( X, &A, B, C, D, 13, 4, 0x289B7EC6 );
10903: P3( X, &D, A, B, C, 0, 11, 0xEAA127FA );
10904: P3( X, &C, D, A, B, 3, 16, 0xD4EF3085 );
10905: P3( X, &B, C, D, A, 6, 23, 0x04881D05 );
10906: P3( X, &A, B, C, D, 9, 4, 0xD9D4D039 );
10907: P3( X, &D, A, B, C, 12, 11, 0xE6DB99E5 );
10908: P3( X, &C, D, A, B, 15, 16, 0x1FA27CF8 );
10909: P3( X, &B, C, D, A, 2, 23, 0xC4AC5665 );
10910: P4( X, &A, B, C, D, 0, 6, 0xF4292244 );
10911: P4( X, &D, A, B, C, 7, 10, 0x432AFF97 );
10912: P4( X, &C, D, A, B, 14, 15, 0xAB9423A7 );
10913: P4( X, &B, C, D, A, 5, 21, 0xFC93A039 );
10914: P4( X, &A, B, C, D, 12, 6, 0x655B59C3 );
10915: P4( X, &D, A, B, C, 3, 10, 0x8F0CCC92 );
10916: P4( X, &C, D, A, B, 10, 15, 0xFFEFF47D );
10917: P4( X, &B, C, D, A, 1, 21, 0x85845DD1 );
10918: P4( X, &A, B, C, D, 8, 6, 0x6FA87E4F );
10919: P4( X, &D, A, B, C, 15, 10, 0xFE2CE6E0 );
10920: P4( X, &C, D, A, B, 6, 15, 0xA3014314 );
10921: P4( X, &B, C, D, A, 13, 21, 0x4E0811A1 );
10922: P4( X, &A, B, C, D, 4, 6, 0xF7537E82 );
10923: P4( X, &D, A, B, C, 11, 10, 0xBD3AF235 );
10924: P4( X, &C, D, A, B, 2, 15, 0x2AD7D2BB );
10925: P4( X, &B, C, D, A, 9, 21, 0xEB86D391 );
10926: ctx->state[0] += A;
10927: ctx->state[1] += B;
10928: ctx->state[2] += C;
10929: ctx->state[3] += D; }
10930:
10931: void md5_update( md5_context *ctx, uint8 *input, uint32 length )
10932: { uint32 left, fill;
10933: if( length < 1 ) return;
10934: left = ctx->total[0] & 0x3F;
10935: fill = 64 - left;
10936: ctx->total[0] += length;
10937: ctx->total[0] &= 0xFFFFFFFF;
10938: if( ctx->total[0] < length )
10939: ctx->total[1]++;
10940: if( left && length >= fill )
10941: { memcpy( (void *) (ctx->buffer + left),
10942: (void *) input, fill );
10943: md5_process( ctx, ctx->buffer );
10944: length -= fill;
10945: input += fill;
10946: left = 0; }
10947: while( length >= 64 )
10948: { md5_process( ctx, input );
10949: length -= 64;
10950: input += 64; }
10951: if( length >= 1 )
10952: memcpy( (void *) (ctx->buffer + left),
10953: (void *) input, length ); }
10954:
10955: void md5_finish( md5_context *ctx, uint8 digest[16] )
10956: { static uint8 md5_padding[64] =
10957: { 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
10958: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
10959: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
10960: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
10961: uint32 last, padn;
10962: uint32 high, low;
10963: uint8 msglen[8];
10964: high = ( ctx->total[0] >> 29 )
10965: | ( ctx->total[1] << 3 );
10966: low = ( ctx->total[0] << 3 );
10967: PUT_UINT32( low, msglen, 0 );
10968: PUT_UINT32( high, msglen, 4 );
10969: last = ctx->total[0] & 0x3F;
10970: padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
10971: md5_update( ctx, md5_padding, padn );
10972: md5_update( ctx, msglen, 8 );
10973: PUT_UINT32( ctx->state[0], digest, 0 );
10974: PUT_UINT32( ctx->state[1], digest, 4 );
10975: PUT_UINT32( ctx->state[2], digest, 8 );
10976: PUT_UINT32( ctx->state[3], digest, 12 ); }
10977: /* --- end-of-function md5str() and "friends" --- */
10978:
10979: #if defined(GIF)
10980: /* ==========================================================================
10981: * Function: GetPixel ( int x, int y )
10982: * Purpose: callback for GIF_CompressImage() returning the
10983: * pixel at column x, row y
10984: * --------------------------------------------------------------------------
10985: * Arguments: x (I) int containing column=0...width-1
10986: * of desired pixel
10987: * y (I) int containing row=0...height-1
10988: * of desired pixel
10989: * --------------------------------------------------------------------------
10990: * Returns: ( int ) 0 or 1, if pixel at x,y is off or on
10991: * --------------------------------------------------------------------------
10992: * Notes: o
10993: * ======================================================================= */
10994: /* --- entry point --- */
10995: int GetPixel ( int x, int y )
10996: {
10997: int ipixel = y*bitmap_raster->width + x; /* pixel index for x,y-coords*/
10998: int pixval =0; /* value of pixel */
10999: if ( !isaa ) /* use bitmap if not anti-aliased */
11000: pixval = (int)getlongbit(bitmap_raster->pixmap,ipixel); /*pixel = 0 or 1*/
11001: else /* else use anti-aliased grayscale*/
11002: pixval = (int)(colormap_raster[ipixel]); /* colors[] index number */
11003: if ( msgfp!=NULL && msglevel>=9999 ) /* dump pixel */
11004: { fprintf(msgfp,"GetPixel> x=%d, y=%d pixel=%d\n",x,y,pixval);
11005: fflush(msgfp); }
11006: return pixval;
11007: } /* --- end-of-function GetPixel() --- */
11008: #endif /* gif */
11009: #endif /* driver */
11010: #endif /* PART1 */
11011: /* ======================= END-OF-FILE MIMETEX.C ========================= */
11012:
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