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#!/usr/bin/perl
# $Id$
use strict;
use warnings;
use Cairo;
my $filename = $ARGV[0];
unless (-e $filename && -f $filename) {
die "`$filename doesn't seem to be a file";
}
open my $rfh, '<', $filename;
my $surface = Cairo::ImageSurface->create_from_png_stream (sub {
my ($closure, $length) = @_;
my $buffer;
if ($length != sysread ($rfh, $buffer, $length)) {
die 'read-error';
}
return $buffer;
});
warn "status: " . $surface->status;
close $rfh;
open my $wfh, '>', $filename . '.bak';
$surface->write_to_png_stream (sub {
my ($closure, $data) = @_;
if (!syswrite ($wfh, $data)) {
die 'write-error';
}
});
close $wfh;
warn "status: " . $surface->status;
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