home *** CD-ROM | disk | FTP | other *** search
- package Image::Info::PPM;
-
- # Copyright 2000, Gisle Aas.
- #
- # This library is free software; you can redistribute it and/or
- # modify it under the same terms as Perl itself.
-
- =begin register
-
- MAGIC: /^P[1-6]/;
-
- =item PBM/PGM/PPM
-
- All information available is extracted.
-
- =end register
-
- =cut
-
- use strict;
-
- sub process_file
- {
- my($info, $fh) = @_;
-
-
- my @header;
- my $type;
- my $num_wanted = 3;
- my $binary;
-
- local($/, $_) = ("\n");
- while (<$fh>) {
- if (s/#\s*(.*)//) {
- $info->push_info(0, "Comment", $1);
- }
- push(@header, split(' '));
- if (!$type && @header) {
- $type = shift(@header);
- $type =~ s/^P// || die;
- $binary++ if $type > 3;
- $type = "p" . qw/p b g/[$type % 3] . "m";
- $num_wanted = 2 if $type eq "pbm";
- }
-
- for (@header) {
- unless (/^\d+$/) {
- die "Badly formatted $type file";
- }
- }
-
- next unless @header >= $num_wanted;
-
- # Now we know everything there is to know...
- $info->push_info(0, "file_media_type" => "image/$type");
- $info->push_info(0, "file_ext" => "$type");
- $info->push_info(0, "width", shift @header);
- $info->push_info(0, "height", shift @header);
- $info->push_info(0, "resolution", "1/1");
- if ($type eq "ppm") {
- $info->push_info(0, "color_type", "RGB");
- $info->push_info(0, "SamplesPerPixel", 3);
- if ($binary) {
- for (1..3) {
- $info->push_info(0, "BitsPerSample", 8);
- }
- }
- }
- else {
- $info->push_info(0, "color_type", "Gray");
- $info->push_info(0, "SamplesPerPixel", 1);
- $info->push_info(0, "BitsPerSample", ($type eq "pbm") ? 1 : 8)
- if $binary;
- }
- $info->push_info(0, "MaxSampleValue", shift @header) if $type ne "pbm";
- last;
- }
- }
-
- 1;
-