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- subimages get placed properly
- missing subimages don't cause things to blow up and log an error

#!/usr/bin/perl
# The LearningOnline Network with CAPA
# randomlabel.png: composite together text and images into 1 image
#
# $Id: randomlylabel.pm,v 1.9 2003/05/13 19:08:31 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
###

package Apache::randomlylabel;

use strict;
use Image::Magick;
use Apache::Constants qw(:common);
use Apache::loncommon();
use GD;

sub get_image {
    my ($imgsrc,$set_trans)=@_;
    my $image;
    if ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
	my $conv_image = Image::Magick->new;
	my $current_figure = $conv_image->Read('filename'=>$imgsrc);
	$conv_image->Set('magick'=>'png');
	my @blobs=$conv_image->ImageToBlob();
	undef $conv_image;
	$image = GD::Image->new($blobs[0]);
    } else {
	GD::Image->trueColor(1);
	$image = GD::Image->new($imgsrc);
    }
    if ($set_trans && defined($image)) {
	my $white=$image->colorExact(255,255,255);
	if ($white != -1) { $image->transparent($white); }
    }
    return $image;
}

sub handler {
    my $r = shift;
    $r->content_type('image/png');
    my (undef,$token) = split(/=/,$ENV{'QUERY_STRING'});
    &Apache::loncommon::get_unprocessed_cgi(
               &Apache::lonnet::unescape($ENV{'imagerequest.'.$token}));
    my $image=&get_image($ENV{"form.BGIMG"},0);
    if (! defined($image)) {
        &Apache::lonnet::logthis('Unable to create image object for '.
				 $ENV{"form.BGIMG"});
        return OK;
    }
    #binmode(STDOUT);
    my $black;
    if (!($black=$image->colorResolve(0,0,0))) {
	$black = $image->colorClosestHWB(0,0,0);
    }
    for(my $i=0;$i<$ENV{"form.ICOUNT"};$i++) {
	my $subimage=&get_image($ENV{"form.IMG$i"},1);
	if (!defined($subimage)) {
            &Apache::lonnet::logthis('Unable to create image object for '.
                                 $ENV{"form.BGIMG"});
            next;
        }
	$image->copy($subimage,$ENV{"form.IX$i"},$ENV{"form.IY$i"},
		     0,0,$subimage->getBounds());
    }
    my $height=GD::Font->Giant->height;
    for(my $i=0;$i<$ENV{"form.COUNT"};$i++) {
	$image->string(gdGiantFont,$ENV{"form.X$i"},$ENV{"form.Y$i"}-$height,
		       $ENV{"form.LB$i"},$black);
    }
    $r->print($image->png);
    return OK;
}

1;

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.