Annotation of loncom/html/adm/jsMath/plugins/spriteImageFonts.js, revision 1.2
1.1 albertel 1: /*
2: * plugins/spriteImageFonts.js
3: *
4: * Part of the jsMath package for mathematics on the web.
5: *
6: * This file makes jsMath use single files for the image fonts
7: * rather than individual images for each character.
8: *
9: * ---------------------------------------------------------------------
10: *
11: * Copyright 2006 by Davide P. Cervone
12: *
13: * Licensed under the Apache License, Version 2.0 (the "License");
14: * you may not use this file except in compliance with the License.
15: * You may obtain a copy of the License at
16: *
17: * http://www.apache.org/licenses/LICENSE-2.0
18: *
19: * Unless required by applicable law or agreed to in writing, software
20: * distributed under the License is distributed on an "AS IS" BASIS,
21: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
22: * See the License for the specific language governing permissions and
23: * limitations under the License.
24: */
25:
26: if (!window.jsMath) {window.jsMath = {}}
27: if (!jsMath.styles) {jsMath.styles = []}
28:
29: jsMath.styles['.typeset .img'] = 'position:relative; display:inline-block; overflow:hidden; background-repeat: no-repeat';
30: jsMath.styles['.typeset .img .xy'] = 'position:relative; left:0px; top:0px';
31:
32: // for Mozilla
33: jsMath.styles['.typeset .mimg'] = 'position:relative';
34: jsMath.styles['.typeset .mimg .size'] = 'display:-moz-inline-box';
35: jsMath.styles['.typeset .mimg .wh'] = 'position:absolute; left:0px; top:0px; overflow:hidden';
36: jsMath.styles['.typeset .mimg .xy'] = 'position:relative; left:0px; top:0px';
37: // for MSIE
38: jsMath.styles['.typeset .mimg .h'] = 'position:relative; display:inline-block; width:0px';
39:
40: /*
41: * Replace the TeXIMG function with one that uses the sprite fonts
42: */
43: if (!jsMath.Box) {jsMath.Box = {}}
44: jsMath.Box.TeXIMG = function (font,C,size) {
45: var c = jsMath.TeX[font][C];
46: if (c.img.reload && jsMath.Img[c.img.reload][font].loaded == 1)
47: {delete c.img.reload; c.img.size = null}
48: if (c.img.size != null && c.img.size == size &&
49: c.img.best != null && c.img.best == jsMath.Img.best) return;
50: var mustScale = (jsMath.Img.scale != 1);
51: var id = jsMath.Img.best + size - 4;
52: if (id < 0) {id = 0; mustScale = 1} else
53: if (id >= jsMath.Img.fonts.length) {id = jsMath.Img.fonts.length-1; mustScale = 1}
54: var imgFont = jsMath.Img[jsMath.Img.fonts[id]][font];
55: if (!imgFont.loaded && jsMath.Browser.waitForImages) {
56: // store information so several fonts can be loaded at once
57: jsMath.Img.mustLoad[jsMath.Img.mustLoad.length] = [font,jsMath.Img.fonts[id]];
58: imgFont.loaded = -1;
59: }
60: var img = imgFont[C];
61: var scale = 1/jsMath.Img.w[jsMath.Img.fonts[id]];
62: if (id != jsMath.Img.best + size - 4) {
63: if (c.w != null) {scale = c.w/img[0]} else {
64: scale *= jsMath.Img.fonts[size]/jsMath.Img.fonts[4]
65: * jsMath.Img.fonts[jsMath.Img.best]/jsMath.Img.fonts[id];
66: }
67: }
68:
69: // get the metrics for the character glyph
70: var bScale = jsMath.Browser.imgScale;
71: if (img[3] == null) {img[3] = 0}
72: var w = (img[0]-img[3])*scale; var h = img[1]*scale; var d = -img[2]*scale;
73: var x = img[3]-imgFont.x[C%16]; var y = img[1]-img[2]-imgFont.y[Math.floor(C/16)];
74: var wh; var xy; var v;
75: var ladjust = ""; var resize = ""; var vadjust; var wadjust;
76:
77: if ((mustScale || jsMath.Controls.cookie.scaleImg) && !jsMath.Browser.operaImageFonts) {
78: w += 2/jsMath.em; h += 2/jsMath.em; d -= 1/jsMath.em; y += 1; x += 1; // try to adjust for rounding errors
79: resize = "width:"+jsMath.HTML.Em(imgFont.wh[0]*scale*bScale)+";";
80: wh = "width:"+jsMath.HTML.Em(w*bScale)+";height:"+jsMath.HTML.Em(h*bScale)+";";
81: xy = "left:"+jsMath.HTML.Em(x*scale*bScale)+";top:"+jsMath.HTML.Em(y*scale*bScale)+";";
82: vadjust = "vertical-align:"+jsMath.HTML.Em(d*bScale)+";";
83: v = jsMath.HTML.Em(h+d);
84: if (img[3]) {ladjust = "margin-left:"+jsMath.HTML.Em(-img[3]*scale*bScale)+";"}
85: } else {
86: if (jsMath.Browser.msieAlphaBug && jsMath.Controls.cookie.alpha) {
87: resize = "height:"+(imgFont.wh[1]*jsMath.Browser.imgScale)+"px;"
88: + "width:"+(imgFont.wh[0]*jsMath.Browser.imgScale)+"px;";
89: }
90: wh = "width:"+img[0]+"px; height:"+img[1]+"px;";
91: xy = "left:"+x+"px; top:"+y+"px;";
92: vadjust = "vertical-align:"+(-img[2])+"px;"; v = (img[1]-img[2])+"px";
93: if (img[3]) {ladjust = "margin-left:"+(-img[3])+"px;"}
94: }
95:
96: wadjust = (c.w == null || Math.abs(c.w-w) < .01)? "" : " margin-right:"+jsMath.HTML.Em(c.w-w)+';';
97: if (img[2] == 0 || jsMath.Browser.valignBug) {vadjust = ""}
98:
99: // get the image
100: var URL = jsMath.Img.URL(font,jsMath.Img.fonts[id],C); var IMG;
101: if (jsMath.Browser.msieAlphaBug && jsMath.Controls.cookie.alpha) {
102: IMG = '<span class="xy" style="'+xy+'">'
103: + '<img src="'+jsMath.blank+'" style="' + resize
104: + 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='
105: + "'" + URL + "', sizingMethod='scale'" + ');" />'
106: + '</span>';
107: } else {
108: IMG = '<img src="'+URL+'" class="xy" style="'+xy+resize+'" />';
109: }
110: if (imgFont.loaded == -1) {IMG = ""; c.img.reload = jsMath.Img.fonts[id]}
111:
112: // get the HTML for cropping the image
113: c.c = this.IMG(IMG,wh,vadjust,wadjust,ladjust,v,x,y,URL);
114: c.tclass = "normal";
115: c.img.bh = h+d; c.img.bd = -d;
116: c.img.size = size; c.img.best = jsMath.Img.best;
117: };
118:
119: /*
120: * Default uses inline-box containing an image
121: */
122: jsMath.Box.IMG = function (IMG,wh,vadjust,wadjust,ladjust,v,x,y,URL) {
123: return '<span class="img" style="'+wh+vadjust+wadjust+ladjust+'">'
124: + IMG + '</span>' + jsMath.Browser.msieImgFontBBoxFix;
125: };
126:
127: /*
128: * Opera bug in inline-block alignment forces use of background image
129: */
130: jsMath.Box.IMG_opera = function (IMG,wh,vadjust,wadjust,ladjust,v,x,y,URL) {
131: var html = '<span class="img" style="background-image: url('+URL+');'
132: + wh + vadjust + 'background-position: '+x+'px '+y+'px"></span>';
133: if (wadjust || ladjust)
134: {html = '<span style="'+wadjust+ladjust+'">' + html + '</span>'}
135: return html;
136: };
137:
138: /*
139: * Mozilla's -moz-inline-box has top aligned with baseline, so adjust
140: */
141: jsMath.Box.IMG_mozilla = function (IMG,wh,vadjust,wadjust,ladjust,v,x,y,URL) {
142: vadjust = "vertical-align:"+v+";";
143: var html = '<span class="mimg" style="'+vadjust+'">'
144: + '<span class="size" style="'+wh+'"></span>'
145: + '<span class="wh" style="'+wh+'">' + IMG + '</span>'
146: + '</span>';
147: if (wadjust || ladjust)
148: {html = '<span style="'+wadjust+ladjust+'">' + html + '</span>'}
149: return html;
150: };
151:
152: /*
153: * MSIE screws up vadjust on inline-box elements, so use absolute
154: * positioning and an extra span to set the width and height
155: */
156: jsMath.Box.IMG_msie = function (IMG,wh,vadjust,wadjust,ladjust,v,x,y,URL) {
157: var html = '<span class="mimg">'
158: + '<span class="h" style="height:'+v+'">'
159: + '<span class="wh" style="'+wh+'">' + IMG + '</span>'
160: + '</span>'
161: + '<span class="img" style="'+wh+vadjust+'"></span>'
162: + '</span>';
163: if (wadjust || ladjust) {
164: html = jsMath.Browser.msieSpaceFix
165: + '<span style="'+wadjust+ladjust+'">' + html + '</span>';
166: }
167: return html;
168: };
169:
170: if (!jsMath.Img) {jsMath.Img = {}}
171:
172: /*
1.2 ! albertel 173: * Called by the extra-font definition files to add an image font
1.1 albertel 174: * into the mix (save offset data and image size)
175: */
176: jsMath.Img.AddFont = function (size,def) {
177: if (!jsMath.Img[size]) {jsMath.Img[size] = {}};
178: for (var font in def) {
179: def[font].x = def[font][128]; def[font].y = def[font][129];
180: def[font].wh = def[font][130];
181: delete def[font][128]; delete def[font][129]; delete def[font][130];
182: }
183: jsMath.Add(jsMath.Img[size],def);
184: };
185:
186: /*
187: * Get URL to directory for given font and size, based on the
188: * user's alpha/plain setting
189: */
190: jsMath.Img.URL = function (name,size) {
191: if (size == null) {return this.root+name+'/font.js'}
192: var type = (jsMath.Controls.cookie.alpha) ? '/alpha/': '/plain/';
193: return this.root+name+type+size+'.png';
194: };
195:
196: /*
197: * Laod the data for an image font
198: */
199: jsMath.Img.LoadFont = function (name) {
200: if (jsMath.browser == 'OmniWeb' && !jsMath.Browser.hasInlineBlock) {
201: jsMath.noImgFonts = 1;
202: jsMath.Font.Check();
203: return;
204: }
205: if (!this.loaded) this.Init();
206: jsMath.Setup.Script(this.URL(name));
207: };
208:
209: /*
210: * Setup for print mode
211: */
212: jsMath.Img.Init = function () {
213: if ((jsMath.Controls.cookie.print || jsMath.Controls.cookie.stayhires) && !jsMath.Browser.operaImgFonts) {
214: jsMath.Controls.cookie.print = jsMath.Controls.cookie.stayhires;
215: this.factor *= 3;
216: if (!jsMath.Controls.isLocalCookie || !jsMath.Global.isLocal) {jsMath.Controls.SetCookie(0)}
217: if (jsMath.Browser.alphaPrintBug) {jsMath.Controls.cookie.alpha = 0}
218: }
219: this.loaded = 1;
220: jsMath.Browser.ImgFontInit();
221: jsMath.Img.root = jsMath.root + "fonts-sprite/";
222: };
223:
224:
225: if (!jsMath.Browser) {jsMath.Browser = {}}
226: /*
227: * These should be part of the regular browser
228: * test functions
229: */
230: jsMath.Browser.ImgFontInit = function () {
231: this.msieImgFontBBoxFix = '';
232: if (jsMath.browser == 'Mozilla') {
233: jsMath.Box.IMG = jsMath.Box.IMG_mozilla;
234: } else if (jsMath.browser == 'Opera') {
235: this.operaImageFonts = 1;
236: jsMath.Box.IMG = jsMath.Box.IMG_opera;
237: } else if (jsMath.browser == 'MSIE') {
1.2 ! albertel 238: if (jsMath.platform == 'mac') {
1.1 albertel 239: this.msieImgFontBBoxFix = '<span style="display:none">x</span>'
240: } else {
241: jsMath.Parser.prototype.oldTypeset = jsMath.Parser.prototype.Typeset;
242: jsMath.Parser.prototype.Typeset = jsMath.Parser.prototype.msieTypeset;
243: jsMath.Img.mustLoad = [];
244: this.msieImageFonts = 1;
245: jsMath.Controls.defaults.alpha = 0;
246: if (!jsMath.Controls.userSet.alpha) {jsMath.Controls.cookie.alpha = 0}
247: jsMath.Box.IMG = jsMath.Box.IMG_msie;
248: }
249: }
250: jsMath.version += "-sp1.0";
251: };
252:
1.2 ! albertel 253: if (!jsMath.Setup) {jsMath.Setup = {}}
! 254: jsMath.Setup.Fonts = function () {
! 255: for (var i = 0; i < jsMath.TeX.fam.length; i++) {
! 256: var name = jsMath.TeX.fam[i];
! 257: if (name) {this.EncodeFont(name)}
! 258: }
! 259: jsMath.Img.Init();
! 260: };
1.1 albertel 261:
262: if (!jsMath.Parser) {jsMath.Parser = {}}
263: if (!jsMath.Parser.prototype) {jsMath.Parser.prototype = {}}
264: /*
265: * Handle loading of image files needed for this equation
266: * (avoids MSIE bug where it will request the image more
267: * than once if it is used more than once before it is
268: * loaded.)
269: */
270: jsMath.Parser.prototype.msieTypeset = function () {
271: var HTML = this.oldTypeset();
272: if (jsMath.Img.mustLoad.length > 0) {
273: for (var i = 0; i < jsMath.Img.mustLoad.length; i++) {
274: var IMG = jsMath.Img.URL(jsMath.Img.mustLoad[i][0],jsMath.Img.mustLoad[i][1]);
275: jsMath.Script.WaitForImage(IMG);
276: jsMath.Img[jsMath.Img.mustLoad[i][1]][jsMath.Img.mustLoad[i][0]].loaded = 1;
277: }
278: jsMath.Img.mustLoad = [];
279: jsMath.Translate.restart = 1;
280: throw "restart";
281: }
282: return HTML;
283: };
284:
285: /*
286: * Override the control panel calls in order to
287: * disable scaling in Opera.
288: */
289: if (!jsMath.Controls) {jsMath.Controls = {}}
290: /*
291: * Add Opera calls to loading of control panel
292: */
293: jsMath.Controls.Panel = function () {
294: jsMath.Translate.Cancel();
295: if (this.loaded) {
296: this.Main();
297: } else {
298: jsMath.Script.delayedLoad(jsMath.root+"jsMath-controls.html");
299: jsMath.Script.Push(this,"OperaInit");
300: }
301: };
302:
303: /*
304: * Disable hi-res fonts and image scaling in Opera
305: */
306: jsMath.Controls.OperaMain = function (init) {
307: if (!init) {this.OldMain()}
308: jsMath.Element("_resolution").disabled = true;
309: };
310:
311: jsMath.Controls.OperaOptions = function () {
312: this.OldOptions();
313: jsMath.Element("_scaleImg").disabled = true;
314: jsMath.Element("_scaleImgText").className = "disabled";
315: };
316:
317: jsMath.Controls.OperaInit = function () {
318: if (!jsMath.Browser.operaImageFonts) return;
319: this.OldMain = this.Main; this.Main = this.OperaMain;
320: this.OldOptions = this.Options; this.Options = this.OperaOptions;
321: this.OperaMain(1);
322: };
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