tools/buildimage

   1 #! /usr/bin/perl -w
   2 #
   3 # Render SVG files containing one or more images into an ICO or BMP.
   4 #
   5 # Copyright (C) 2010 Joel Holdsworth
   6 #
   7 # This library is free software; you can redistribute it and/or
   8 # modify it under the terms of the GNU Lesser General Public
   9 # License as published by the Free Software Foundation; either
  10 # version 2.1 of the License, or (at your option) any later version.
  11 #
  12 # This library is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 # Lesser General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU Lesser General Public
  18 # License along with this library; if not, write to the Free Software
  19 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20
  21 use strict;
  22 use warnings;
  23 use XML::Parser;
  24 use MIME::Base64;
  25 use File::Copy;
  26
  27 # Parse the parameters
  28 my $svgFileName = $ARGV[0];
  29 my $outFileName = $ARGV[1];
  30
  31 die "Cannot open SVG file" unless defined($svgFileName);
  32 die "Cannot open output file" unless defined($outFileName);
  33
  34 $outFileName =~ m/(.*)\.(.*)/;
  35 my $outName = $1;
  36 my $ext = lc($2);
  37 die "Only BMP and ICO outputs are supported" unless $ext eq "bmp" or $ext eq "ico";
  38
  39 my $renderedSVGFileName = "$svgFileName.png";
  40 my @pngFiles;
  41 my @pngFilesRaw;
  42
  43 # Get the programs from the environment variables
  44 my $convert = $ENV{"CONVERT"} || "convert";
  45 my $rsvg = $ENV{"RSVG"} || "rsvg";
  46 my $icotool = $ENV{"ICOTOOL"} || "icotool";
  47
  48 # Be ready to abort
  49 sub cleanup()
  50 {
  51     unlink $renderedSVGFileName;
  52     unlink $_ foreach(@pngFiles);
  53     unlink $_ foreach(@pngFilesRaw);
  54 }
  55
  56 $SIG{"INT"} = "cleanup";
  57 $SIG{"HUP"} = "cleanup";
  58 $SIG{"TERM"} = "cleanup";
  59 $SIG{"__DIE__"} = "cleanup";
  60
  61 # run a shell command and die on error
  62 sub shell(@)
  63 {
  64     my @args = @_;
  65     system(@args) == 0 or die "@args failed: $?";
  66 }
  67
  68 sub svg_element_start
  69 {
  70     my($expat, $element, %attr) = @_;
  71
  72     # Parse the id for icon/bitmap render directives
  73     my $id = $attr{'id'};
  74     return unless defined($id);
  75
  76     my $size = 0;
  77     my $depth = 0;
  78     my $width = 0;
  79     my $height = 0;
  80
  81     if($ext eq "ico") {
  82         return unless $id =~ /icon:(\d*)-(\d*)/;
  83         $size = $1;
  84         $depth = $2;
  85     } elsif($ext eq "bmp") {
  86         return unless $id =~ /bitmap:(\d*)-(\d*)/;
  87         $size = $1;
  88         $depth = $2;
  89     }
  90
  91     return unless defined($size) and defined($depth);
  92
  93     warn "Unexpected icon depth" unless
  94         $depth == 4 or $depth == 8 or $depth == 24 or $depth == 32;
  95     my $pngFileName = "$outName-$size-$depth.png";
  96
  97     if($element eq "svg") {
  98
  99         # The whole file is tagged
 100         copy($renderedSVGFileName, $pngFileName) or die "File could not be copied";
 101
 102     } elsif($element eq "rect") {
 103
 104         # Extract SVG vector images
 105         my $x = $attr{'x'};
 106         my $y = $attr{'y'};
 107         $width = $attr{'width'};
 108         $height = $attr{'height'};
 109
 110         if(defined($x) and defined($x)) {
 111             if($x =~ /\d*/ and $y =~ /\d*/) {
 112                 shell $convert, $renderedSVGFileName, "-crop", "${width}x${height}+$x+$y", $pngFileName;
 113             }
 114         }
 115
 116     } elsif($element eq "image" ) {
 117
 118         # Extract Base64 encoded PNG data to files
 119         my $xlinkHref = $attr{'xlink:href'};
 120         if(defined($xlinkHref)) {
 121             $xlinkHref =~ /data:image\/png;base64(.*)/;
 122             my $imageEncodedData = $1;
 123             if(defined $imageEncodedData) {
 124                 open(FILE, '>' . $pngFileName) or die "$!";
 125                 print FILE decode_base64($imageEncodedData);
 126                 close FILE;
 127             }
 128         }
 129     } else {
 130         return;
 131     }
 132
 133     if ($width >= 128 && $height >= 128)
 134     {
 135         push(@pngFilesRaw, $pngFileName);
 136     }
 137     else
 138     {
 139         push(@pngFiles, $pngFileName);
 140     }
 141 }
 142
 143 # Render the SVG image
 144 shell $rsvg, $svgFileName, $renderedSVGFileName;
 145
 146 # Render the images in the SVG
 147 my $parser = new XML::Parser(
 148     Handlers => {Start => \&svg_element_start});
 149 $parser->parsefile("$svgFileName");
 150
 151 # If no render directives were found, take the full image as-is
 152 unless (@pngFiles || @pngFilesRaw) {
 153     my $pngFileName = "bmp$renderedSVGFileName";
 154     copy($renderedSVGFileName, $pngFileName) or die "File could not be copied";
 155     push(@pngFiles, $pngFileName);
 156 }
 157
 158 # Combine the renderings into the output file
 159 if($ext eq "ico") {
 160
 161     # Place images into the ICO
 162     shell $icotool, "-c", "-o", $outFileName, @pngFiles, map { "--raw=$_"; } @pngFilesRaw;
 163
 164 } elsif($ext eq "bmp") {
 165
 166     # Only the first image becomes the final BMP
 167     my $pngFile = $pngFiles[0];
 168     $pngFile =~ /.*-\d*-(\d*)\.png/;
 169     my $depth = $1;
 170
 171     # Convert it into a bmp
 172     if($depth == 24) {
 173         shell $convert, "png:$pngFile", "+matte", $outFileName;
 174     } else {
 175         shell $convert, "png:$pngFile", $outFileName;
 176     }
 177
 178 }
 179
 180 # Delete the intermediate images
 181 cleanup();