143 lines
3.8 KiB
Perl
Executable File
143 lines
3.8 KiB
Perl
Executable File
#! /usr/bin/perl -w
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#
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# Render SVG files containing multiple images
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#
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# Copyright (C) 2010 Joel Holdsworth
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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use strict;
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use warnings;
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use XML::Parser;
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use MIME::Base64;
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# Parse the parameters
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my $svgFileName = $ARGV[0];
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my $icoFileName = $ARGV[1];
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die "Cannot open SVG file" unless defined($svgFileName);
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die "Cannot open ICO file" unless defined($icoFileName);
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my $renderedSVGFileName = "$svgFileName.ico";
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$icoFileName =~ m/(.*)\.ico/;
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my $icoName = $1;
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my @pngFiles;
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# Get the programs from the environment variables
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my $convert = $ENV{"CONVERT"} || "convert";
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my $rsvg = $ENV{"RSVG"} || "rsvg";
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my $icotool = $ENV{"ICOTOOL"} || "icotool";
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sub cleanup()
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{
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unlink $renderedSVGFileName;
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unlink $_ foreach(@pngFiles);
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}
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$SIG{"INT"} = "cleanup";
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$SIG{"HUP"} = "cleanup";
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$SIG{"TERM"} = "cleanup";
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$SIG{"__DIE__"} = "cleanup";
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# run a shell command and die on error
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sub shell(@)
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{
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my @args = @_;
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system(@args) == 0 or die "@args failed: $?";
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}
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sub svg_element_start
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{
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my($expat, $element, %attr) = @_;
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# Parse the id for icon format
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my $id = $attr{'id'};
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return unless defined($id);
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return unless $id =~ /icon:(\d*)-(\d*)/;
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my $size = $1;
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my $depth = $2;
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return unless defined($size) and defined($depth);
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warn "Unexpected icon depth" unless
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$depth == 4 or $depth == 8 or $depth == 32;
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my $pngFileName = "$icoName-$size-$depth.png";
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if($element eq "rect") {
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# Extract SVG vector images
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my $x = $attr{'x'};
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my $y = $attr{'y'};
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if(defined($x) and defined($x)) {
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if($x =~ /\d*/ and $y =~ /\d*/) {
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shell $convert, $renderedSVGFileName, "-crop", "${size}x${size}+$x+$y", $pngFileName;
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}
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}
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} elsif($element eq "image" ) {
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# Extract Base64 encoded PNG data to files
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my $xlinkHref = $attr{'xlink:href'};
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if(defined($xlinkHref)) {
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$xlinkHref =~ /data:image\/png;base64(.*)/;
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my $imageEncodedData = $1;
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if(defined $imageEncodedData) {
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open(FILE, '>' . $pngFileName) or die "$!";
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print FILE decode_base64($imageEncodedData);
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close FILE;
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}
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}
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} else {
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return;
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}
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push(@pngFiles, $pngFileName);
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}
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sub resize_image
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{
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# Use ImageMagick to stretch the image
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my($size) = @_;
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my $pngFileName = "$icoName-$size.png";
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shell $convert, $renderedSVGFileName, "-resize", "${size}x${size}", $pngFileName;
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push(@pngFiles, $pngFileName);
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}
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sub fallback_render
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{
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resize_image(16);
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resize_image(32);
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resize_image(48);
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}
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# Render the SVG image
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shell 'rsvg', $svgFileName, $renderedSVGFileName;
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# Render the images in the SVG
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my $parser = new XML::Parser(
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Handlers => {Start => \&svg_element_start});
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$parser->parsefile("$svgFileName");
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# If no render directives were found, this is an old-style icon
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# which should be rendered with the old build rule
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fallback_render unless(@pngFiles);
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# Combine them into an ICO file
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shell $icotool, "-c", "-o", $icoFileName, @pngFiles;
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# Delete the intermediate images
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unlink $renderedSVGFileName;
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unlink $_ foreach(@pngFiles);
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