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package Image::Info::PPM; |
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# Copyright 2000, Gisle Aas. |
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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 same terms as Perl itself. |
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=begin register |
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MAGIC: /^P[1-6]/ |
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=item PBM/PGM/PPM |
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All information available is extracted. |
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=end register |
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=cut |
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use strict; |
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use vars qw/$VERSION/; |
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1218
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$VERSION = 0.04; |
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sub process_file { |
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my($info, $fh) = @_; |
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my @header; |
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my $type; |
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my $num_wanted = 3; |
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my $binary; |
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my $read_header; |
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local($/, $_) = ("\n"); |
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while (<$fh>) { |
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if (s/#\s*(.*)//) { |
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$info->push_info(0, "Comment", $1); |
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} |
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push(@header, split(' ')); |
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if (!$type && @header) { |
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$type = shift(@header); |
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$type =~ s/^P// || die; |
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$binary++ if $type > 3; |
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$type = "p" . qw/p b g/[$type % 3] . "m"; |
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$num_wanted = 2 if $type eq "pbm"; |
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} |
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for (@header) { |
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unless (/^\d+$/) { |
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die "Badly formatted $type file"; |
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} |
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$_ += 0; # strip leading zeroes |
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} |
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100
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next unless @header >= $num_wanted; |
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# Now we know everything there is to know... |
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$read_header = 1; |
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$info->push_info(0, "file_media_type" => "image/$type"); |
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$info->push_info(0, "file_ext" => "$type"); |
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$info->push_info(0, "width", shift @header); |
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$info->push_info(0, "height", shift @header); |
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$info->push_info(0, "resolution", "1/1"); |
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if ($type eq "ppm") { |
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my $MSV = shift @header; |
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$info->push_info(0, "MaxSampleValue", $MSV); |
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$info->push_info(0, "color_type", "RGB"); |
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$info->push_info(0, "SamplesPerPixel", 3); |
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if ($binary) { |
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for (1..3) { |
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$info->push_info(0, "BitsPerSample", int(log($MSV + 1) / log(2) ) ); |
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} |
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} |
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} |
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else { |
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$info->push_info(0, "color_type", "Gray"); |
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$info->push_info(0, "SamplesPerPixel", 1); |
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$info->push_info(0, "BitsPerSample", ($type eq "pbm") ? 1 : 8) |
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if $binary; |
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$info->push_info(0, "MaxSampleValue", shift @header) if $type ne 'pbm'; |
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} |
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last; |
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} |
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if (!$read_header) { |
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0
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$info->push_info(0, 'error' => 'Incomplete PBM/PGM/PPM header'); |
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} |
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} |
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1; |
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95
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=pod |
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97
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=head1 NAME |
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99
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Image::Info::PPM - PPM support Image::Info |
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101
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=head1 SYNOPSIS |
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use Image::Info qw(image_info dim); |
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my $info = image_info("image.ppm"); |
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if (my $error = $info->{error}) { |
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die "Can't parse image info: $error\n"; |
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} |
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my($w, $h) = dim($info); |
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=head1 DESCRIPTION |
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This modules adds ppm support to L. |
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It is loaded and used automatically. |
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=head1 METHODS |
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=head2 process_file() |
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$info->process_file($source, $options); |
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Processes one file and sets the found info fields in the C<$info> object. |
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=head1 AUTHOR |
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127
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Gisle Aas. |
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=head1 LICENSE |
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131
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This library is free software; you can redistribute it and/or |
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modify it under the same terms as Perl itself. |
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134
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=cut |