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|
#! /usr/bin/perl -w
#
# Render SVG files containing one or more images into an ICO or BMP.
#
# Copyright (C) 2010 Joel Holdsworth
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
use strict;
use warnings;
use XML::Parser;
use MIME::Base64;
use File::Copy;
# Parse the parameters
my $svgFileName = $ARGV[0];
my $outFileName = $ARGV[1];
die "Cannot open SVG file" unless defined($svgFileName);
die "Cannot open output file" unless defined($outFileName);
$outFileName =~ m/(.*)\.(.*)/;
my $outName = $1;
my $ext = lc($2);
die "Only BMP and ICO outputs are supported" unless $ext eq "bmp" or $ext eq "ico";
my $renderedSVGFileName = "$svgFileName.png";
my @pngFiles;
my @pngFilesRaw;
# Get the programs from the environment variables
my $convert = $ENV{"CONVERT"} || "convert";
my $rsvg = $ENV{"RSVG"} || "rsvg";
my $icotool = $ENV{"ICOTOOL"} || "icotool";
# Be ready to abort
sub cleanup()
{
unlink $renderedSVGFileName;
unlink $_ foreach(@pngFiles);
unlink $_ foreach(@pngFilesRaw);
}
$SIG{"INT"} = "cleanup";
$SIG{"HUP"} = "cleanup";
$SIG{"TERM"} = "cleanup";
$SIG{"__DIE__"} = "cleanup";
# run a shell command and die on error
sub shell(@)
{
my @args = @_;
system(@args) == 0 or die "@args failed: $?";
}
sub svg_element_start
{
my($expat, $element, %attr) = @_;
# Parse the id for icon/bitmap render directives
my $id = $attr{'id'};
return unless defined($id);
my $size = 0;
my $depth = 0;
my $width = 0;
my $height = 0;
if($ext eq "ico") {
return unless $id =~ /icon:(\d*)-(\d*)/;
$size = $1;
$depth = $2;
} elsif($ext eq "bmp") {
return unless $id =~ /bitmap:(\d*)-(\d*)/;
$size = $1;
$depth = $2;
}
return unless defined($size) and defined($depth);
warn "Unexpected icon depth" unless
$depth == 4 or $depth == 8 or $depth == 24 or $depth == 32;
my $pngFileName = "$outName-$size-$depth.png";
if($element eq "svg") {
# The whole file is tagged
copy($renderedSVGFileName, $pngFileName) or die "File could not be copied";
} elsif($element eq "rect") {
# Extract SVG vector images
my $x = $attr{'x'};
my $y = $attr{'y'};
$width = $attr{'width'};
$height = $attr{'height'};
if(defined($x) and defined($y)) {
if($x =~ /\d*/ and $y =~ /\d*/) {
shell $convert, $renderedSVGFileName, "-crop", "${width}x${height}+$x+$y", $pngFileName;
}
}
} elsif($element eq "image" ) {
# Extract Base64 encoded PNG data to files
my $xlinkHref = $attr{'xlink:href'};
if(defined($xlinkHref)) {
$xlinkHref =~ /data:image\/png;base64(.*)/;
my $imageEncodedData = $1;
if(defined $imageEncodedData) {
open(FILE, '>' . $pngFileName) or die "$!";
print FILE decode_base64($imageEncodedData);
close FILE;
}
}
} else {
return;
}
if ($width >= 128 && $height >= 128)
{
push(@pngFilesRaw, $pngFileName);
}
else
{
push(@pngFiles, $pngFileName);
}
}
# Render the SVG image
my @rsvgCmd;
push(@rsvgCmd, $rsvg);
push(@rsvgCmd, $svgFileName);
push(@rsvgCmd, "-o") if ($rsvg eq "rsvg-convert");
push(@rsvgCmd, $renderedSVGFileName);
shell @rsvgCmd;
# Render the images in the SVG
my $parser = new XML::Parser(
Handlers => {Start => \&svg_element_start});
$parser->parsefile("$svgFileName");
# If no render directives were found, take the full image as-is
unless (@pngFiles || @pngFilesRaw) {
my $pngFileName = "bmp$renderedSVGFileName";
copy($renderedSVGFileName, $pngFileName) or die "File could not be copied";
push(@pngFiles, $pngFileName);
}
# Combine the renderings into the output file
if($ext eq "ico") {
# Place images into the ICO
shell $icotool, "-c", "-o", $outFileName, @pngFiles, map { "--raw=$_"; } @pngFilesRaw;
} elsif($ext eq "bmp") {
# Only the first image becomes the final BMP
my $pngFile = $pngFiles[0];
$pngFile =~ /.*-\d*-(\d*)\.png/;
my $depth = $1;
# Convert it into a bmp
if($depth == 24) {
shell $convert, "png:$pngFile", "+matte", $outFileName;
} else {
shell $convert, "png:$pngFile", $outFileName;
}
}
# Delete the intermediate images
cleanup();
|
