| 1 | ###########################################################################
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| 2 | #
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| 3 | # ImageConverter - helper plugin that does image conversion using ImageMagick
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| 4 | #
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| 5 | # A component of the Greenstone digital library software
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| 6 | # from the New Zealand Digital Library Project at the
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| 7 | # University of Waikato, New Zealand.
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| 8 | #
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| 9 | # Copyright (C) 2008 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify
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| 12 | # it under the terms of the GNU General Public License as published by
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| 13 | # the Free Software Foundation; either version 2 of the License, or
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| 14 | # (at your option) any later version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful,
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| 17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | # GNU General Public License for more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License
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| 22 | # along with this program; if not, write to the Free Software
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| 23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###########################################################################
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| 26 | package ImageConverter;
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| 27 |
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| 28 | use PrintInfo;
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| 29 |
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| 30 | use strict;
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| 31 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 32 |
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| 33 | use gsprintf 'gsprintf';
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| 34 |
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| 35 | BEGIN {
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| 36 | @ImageConverter::ISA = ('PrintInfo');
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| 37 | }
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| 38 |
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| 39 | my $arguments = [
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| 40 | { 'name' => "create_thumbnail",
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| 41 | 'desc' => "{ImageConverter.create_thumbnail}",
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| 42 | 'type' => "enum",
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| 43 | 'list' => [{'name' => "true", 'desc' => "{common.true}"},
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| 44 | {'name' => "false", 'desc' => "{common.false}"}],
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| 45 | 'deft' => "true",
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| 46 | 'reqd' => "no" },
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| 47 | { 'name' => "thumbnailsize",
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| 48 | 'desc' => "{ImageConverter.thumbnailsize}",
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| 49 | 'type' => "int",
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| 50 | 'deft' => "100",
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| 51 | 'range' => "1,",
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| 52 | 'reqd' => "no" },
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| 53 | { 'name' => "thumbnailtype",
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| 54 | 'desc' => "{ImageConverter.thumbnailtype}",
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| 55 | 'type' => "string",
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| 56 | 'deft' => "gif",
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| 57 | 'reqd' => "no" },
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| 58 | { 'name' => "noscaleup",
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| 59 | 'desc' => "{ImageConverter.noscaleup}",
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| 60 | 'type' => "flag",
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| 61 | 'reqd' => "no" },
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| 62 | { 'name' => "create_screenview",
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| 63 | 'desc' => "{ImageConverter.create_screenview}",
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| 64 | 'type' => "enum",
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| 65 | 'list' => [{'name' => "true", 'desc' => "{common.true}"},
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| 66 | {'name' => "false", 'desc' => "{common.false}"}],
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| 67 | 'deft' => "true",
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| 68 | 'reqd' => "no" },
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| 69 | { 'name' => "screenviewsize",
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| 70 | 'desc' => "{ImageConverter.screenviewsize}",
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| 71 | 'type' => "int",
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| 72 | 'deft' => "500",
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| 73 | 'range' => "1,",
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| 74 | 'reqd' => "no" },
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| 75 | { 'name' => "screenviewtype",
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| 76 | 'desc' => "{ImageConverter.screenviewtype}",
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| 77 | 'type' => "string",
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| 78 | 'deft' => "jpg",
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| 79 | 'reqd' => "no" },
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| 80 | { 'name' => "converttotype",
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| 81 | 'desc' => "{ImageConverter.converttotype}",
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| 82 | 'type' => "string",
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| 83 | 'deft' => "",
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| 84 | 'reqd' => "no" },
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| 85 | { 'name' => "minimumsize",
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| 86 | 'desc' => "{ImageConverter.minimumsize}",
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| 87 | 'type' => "int",
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| 88 | 'deft' => "100",
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| 89 | 'range' => "1,",
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| 90 | 'reqd' => "no" },
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| 91 | { 'name' => "cache_generated_images",
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| 92 | 'desc' => "{ImageConverter.cache_generated_images}",
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| 93 | 'type' => "flag",
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| 94 | 'reqd' => "no",
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| 95 | 'hiddengli' => "yes" # not yet implemented
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| 96 | }
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| 97 | ];
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| 98 |
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| 99 | my $options = { 'name' => "ImageConverter",
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| 100 | 'desc' => "{ImageConverter.desc}",
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| 101 | 'abstract' => "yes",
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| 102 | 'inherits' => "yes",
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| 103 | 'args' => $arguments };
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| 104 |
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| 105 | sub new {
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| 106 | my ($class) = shift (@_);
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| 107 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 108 | push(@$pluginlist, $class);
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| 109 |
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| 110 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 111 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 112 |
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| 113 | my $self = new PrintInfo($pluginlist, $inputargs, $hashArgOptLists, 1);
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| 114 |
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| 115 | return bless $self, $class;
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| 116 |
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| 117 | }
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| 118 |
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| 119 | # needs to be called after BasePlugin init, so that outhandle is set up.
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| 120 | sub init {
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| 121 | my $self = shift(@_);
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| 122 |
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| 123 | $self->{'tmp_file_paths'} = ();
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| 124 |
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| 125 | # Check that ImageMagick is installed and available on the path
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| 126 | my $image_conversion_available = 1;
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| 127 | my $no_image_conversion_reason = "";
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| 128 | # None of this works very well on Windows 95/98...
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| 129 | if ($ENV{'GSDLOS'} eq "windows" && !Win32::IsWinNT()) {
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| 130 | $image_conversion_available = 0;
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| 131 | $no_image_conversion_reason = "win95notsupported";
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| 132 | } else {
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| 133 | my $result = `identify 2>&1`;
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| 134 | if ($? == -1 || $? == 256) { # Linux and Windows return different values for "program not found"
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| 135 | $image_conversion_available = 0;
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| 136 | $no_image_conversion_reason = "imagemagicknotinstalled";
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| 137 | }
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| 138 | }
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| 139 | $self->{'image_conversion_available'} = $image_conversion_available;
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| 140 | $self->{'no_image_conversion_reason'} = $no_image_conversion_reason;
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| 141 |
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| 142 | if ($self->{'image_conversion_available'} == 0) {
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| 143 | my $outhandle = $self->{'outhandle'};
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| 144 | &gsprintf($outhandle, "ImageConverter: {ImageConverter.noconversionavailable} ({ImageConverter.".$self->{'no_image_conversion_reason'}."})\n");
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| 145 | }
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| 146 |
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| 147 | }
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| 148 |
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| 149 |
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| 150 | # convert image to new type if converttotype is set
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| 151 | # generate thumbnails if required
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| 152 | # generate screenview if required
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| 153 | # discover image metadata
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| 154 | # filename_no_path must be in utf8
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| 155 | sub generate_images {
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| 156 | my $self = shift(@_);
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| 157 |
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| 158 | my ($filename_full_path, $filename_no_path, $doc_obj, $section) = @_;
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| 159 |
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| 160 | # check image magick status
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| 161 | return 0 if $self->{'image_conversion_available'} == 0;
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| 162 | # check the filenames
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| 163 | return 0 if ($filename_no_path eq "" || !-f $filename_full_path);
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| 164 |
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| 165 | my $verbosity = $self->{'verbosity'};
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| 166 | my $outhandle = $self->{'outhandle'};
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| 167 |
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| 168 | # check the size of the image against minimum size if specified
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| 169 | my $minimumsize = $self->{'minimumsize'};
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| 170 | if (defined $minimumsize && (-s $filename_full_path < $minimumsize)) {
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| 171 | print $outhandle "ImageConverter: \"$filename_full_path\" too small, skipping\n"
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| 172 | if ($verbosity > 1);
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| 173 | return 0; # or is there a better return value??
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| 174 | }
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| 175 |
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| 176 | my $filehead = $filename_no_path;
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| 177 | $filehead =~ s/\.([^\.]*)$//; # filename with no extension
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| 178 | my $assocfilemeta = "[assocfilepath]";
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| 179 | if ($section ne $doc_obj->get_top_section()) {
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| 180 | $assocfilemeta = "[parent(Top):assocfilepath]";
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| 181 | }
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| 182 |
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| 183 | # Convert the image to a new type (if required).
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| 184 | my $converttotype = $self->{'converttotype'};
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| 185 | my $type = "unknown";
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| 186 |
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| 187 | if ($converttotype ne "" && $filename_full_path !~ m/$converttotype$/) {
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| 188 |
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| 189 | my $result = $self->convert($filename_full_path, $converttotype, "", "");
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| 190 | ($filename_full_path) = ($result =~ /=>(.*\.$converttotype)/);
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| 191 |
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| 192 | $type = $converttotype;
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| 193 | $filename_no_path = "$filehead.$type";
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| 194 | }
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| 195 |
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| 196 | # add Image metadata
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| 197 | $doc_obj->add_utf8_metadata($section, "Image", $filename_no_path);
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| 198 |
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| 199 | # here we overwrite the original with the potentially converted one
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| 200 | $doc_obj->set_utf8_metadata_element($section, "Source", $filename_no_path);
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| 201 |
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| 202 | # use identify to get info about the (possibly converted) image
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| 203 | my ($image_type, $image_width, $image_height, $image_size)
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| 204 | = &identify($filename_full_path, $outhandle, $verbosity);
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| 205 |
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| 206 | if ($image_type ne " ") {
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| 207 | $type = $image_type;
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| 208 | }
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| 209 |
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| 210 | #overwrite the ones added in BasePlugin
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| 211 | $doc_obj->set_metadata_element ($section, "FileFormat", $type);
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| 212 | $doc_obj->set_metadata_element ($section, "FileSize", $image_size);
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| 213 |
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| 214 | $doc_obj->add_metadata ($section, "ImageType", $image_type);
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| 215 | $doc_obj->add_metadata ($section, "ImageWidth", $image_width);
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| 216 | $doc_obj->add_metadata ($section, "ImageHeight", $image_height);
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| 217 | $doc_obj->add_metadata ($section, "ImageSize", $image_size);
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| 218 |
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| 219 | $doc_obj->add_metadata ($section, "srclink", "<a href=\"_httpprefix_/collect/[collection]/index/assoc/$assocfilemeta/[Image]\">");
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| 220 | $doc_obj->add_metadata ($section, "/srclink", "</a>");
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| 221 | $doc_obj->add_metadata ($section, "srcicon", "<img src=\"_httpprefix_/collect/[collection]/index/assoc/$assocfilemeta/[Image]\" width=\"100\">");
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| 222 |
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| 223 | # Add the image as an associated file
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| 224 | $doc_obj->associate_file($filename_full_path, $filename_no_path, "image/$type", $section);
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| 225 |
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| 226 | if ($self->{'create_thumbnail'} eq "true") {
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| 227 | $self->create_thumbnail($filename_full_path, $filehead, $doc_obj, $section, $assocfilemeta);
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| 228 | }
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| 229 | if ($self->{'create_screenview'} eq "true") {
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| 230 | $self->create_screenview($filename_full_path, $filehead, $doc_obj, $section, $assocfilemeta);
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| 231 | }
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| 232 | }
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| 233 |
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| 234 | sub create_thumbnail {
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| 235 | my $self = shift(@_);
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| 236 | my ($original_file, $filehead, $doc_obj, $section, $assocfilemeta) = @_;
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| 237 |
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| 238 | my $thumbnailsize = $self->{'thumbnailsize'};
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| 239 | my $thumbnailtype = $self->{'thumbnailtype'};
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| 240 |
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| 241 | # Generate the thumbnail with convert
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| 242 | my $result = $self->convert($original_file, $thumbnailtype, "-geometry $thumbnailsize" . "x$thumbnailsize", "THUMB");
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| 243 | my ($thumbnailfile) = ($result =~ /=>(.*\.$thumbnailtype)/);
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| 244 |
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| 245 | # Add the thumbnail as an associated file ...
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| 246 | if (-e "$thumbnailfile") {
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| 247 | $doc_obj->associate_file("$thumbnailfile", $filehead."_thumb.$thumbnailtype",
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| 248 | "image/$thumbnailtype",$section);
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| 249 | $doc_obj->add_metadata ($section, "ThumbType", $thumbnailtype);
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| 250 | $doc_obj->add_utf8_metadata ($section, "Thumb", $filehead."_thumb.$thumbnailtype");
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| 251 |
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| 252 | $doc_obj->add_metadata ($section, "thumbicon", "<img src=\"_httpprefix_/collect/[collection]/index/assoc/$assocfilemeta/[Thumb]\" width=[ThumbWidth] height=[ThumbHeight]>");
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| 253 |
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| 254 |
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| 255 | # Extract Thumbnail metadata from convert output
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| 256 | if ($result =~ m/[0-9]+x[0-9]+=>([0-9]+)x([0-9]+)/) {
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| 257 | $doc_obj->add_metadata ($section, "ThumbWidth", $1);
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| 258 | $doc_obj->add_metadata ($section, "ThumbHeight", $2);
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| 259 | }
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| 260 | } else {
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| 261 | my $outhandle = $self->{'outhandle'};
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| 262 | print $outhandle "Couldn't find thumbnail $thumbnailfile\n";
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| 263 |
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| 264 | }
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| 265 | }
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| 266 |
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| 267 | sub create_screenview {
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| 268 |
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| 269 | my $self = shift(@_);
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| 270 | my ($original_file, $filehead, $doc_obj, $section, $assocfilemeta) = @_;
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| 271 |
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| 272 | # To do: if the actual image smaller than the screenview size,
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| 273 | # we should use the original !
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| 274 |
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| 275 | my $screenviewsize = $self->{'screenviewsize'};
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| 276 | my $screenviewtype = $self->{'screenviewtype'};
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| 277 |
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| 278 | # make the screenview image
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| 279 | my $result = $self->convert($original_file, $screenviewtype, "-geometry $screenviewsize" . "x$screenviewsize", "SCREEN");
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| 280 | my ($screenviewfilename) = ($result =~ /=>(.*\.$screenviewtype)/);
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| 281 |
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| 282 |
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| 283 | #add the screenview as an associated file ...
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| 284 | if (-e "$screenviewfilename") {
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| 285 | $doc_obj->associate_file("$screenviewfilename", $filehead."_screen.$screenviewtype", "image/$screenviewtype",$section);
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| 286 | $doc_obj->add_metadata ($section, "ScreenType", $screenviewtype);
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| 287 | $doc_obj->add_utf8_metadata ($section, "Screen", $filehead."_screen.$screenviewtype");
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| 288 |
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| 289 | $doc_obj->add_metadata ($section, "screenicon", "<img src=\"_httpprefix_/collect/[collection]/index/assoc/$assocfilemeta/[Screen]\" width=[ScreenWidth] height=[ScreenHeight]>");
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| 290 |
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| 291 | # get screenview dimensions, size and type
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| 292 | if ($result =~ m/[0-9]+x[0-9]+=>([0-9]+)x([0-9]+)/) {
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| 293 | $doc_obj->add_metadata ($section, "ScreenWidth", $1);
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| 294 | $doc_obj->add_metadata ($section, "ScreenHeight", $2);
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| 295 | } elsif ($result =~ m/([0-9]+)x([0-9]+)/) {
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| 296 | #if the image hasn't changed size, the previous regex doesn't match
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| 297 | $doc_obj->add_metadata ($section, "ScreenWidth", $1);
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| 298 | $doc_obj->add_metadata ($section, "ScreenHeight", $2);
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| 299 | }
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| 300 | } else {
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| 301 | my $outhandle = $self->{'outhandle'};
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| 302 | print $outhandle "Couldn't find screenview file $screenviewfilename\n";
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| 303 |
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| 304 | }
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| 305 |
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| 306 | }
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| 307 |
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| 308 |
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| 309 |
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| 310 | sub convert {
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| 311 | my $self = shift(@_);
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| 312 | my $source_file_path = shift(@_);
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| 313 | my $target_file_type = shift(@_);
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| 314 | my $convert_options = shift(@_) || "";
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| 315 | my $convert_type = shift(@_) || "";
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| 316 |
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| 317 | my $outhandle = $self->{'outhandle'};
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| 318 | my $verbosity = $self->{'verbosity'};
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| 319 |
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| 320 | # Determine the full name and path of the output file
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| 321 | my $filehead = &util::get_tmp_filename();
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| 322 | my $target_file_path = $filehead . "." . $target_file_type;
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| 323 | push(@{$self->{'tmp_file_paths'}}, $target_file_path);
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| 324 |
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| 325 | # Generate and run the convert command
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| 326 | my $convert_command = "convert -interlace plane -verbose $convert_options \"$source_file_path\" \"$target_file_path\"";
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| 327 | print $outhandle "$convert_type $convert_command\n" if ($verbosity > 2);
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| 328 | my $result = `$convert_command 2>&1`;
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| 329 | print $outhandle "$convert_type RESULT = $result\n" if ($verbosity > 2);
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| 330 |
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| 331 | return $result;
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| 332 | }
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| 333 |
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| 334 |
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| 335 | # Discover the characteristics of an image file with the ImageMagick
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| 336 | # "identify" command.
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| 337 |
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| 338 | sub identify {
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| 339 | my ($image, $outhandle, $verbosity) = @_;
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| 340 |
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| 341 | # Use the ImageMagick "identify" command to get the file specs
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| 342 | my $command = "identify \"$image\" 2>&1";
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| 343 | print $outhandle "$command\n" if ($verbosity > 2);
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| 344 | my $result = '';
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| 345 | $result = `$command`;
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| 346 | print $outhandle "$result\n" if ($verbosity > 3);
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| 347 |
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| 348 | # Read the type, width, and height
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| 349 | my $type = 'unknown';
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| 350 | my $width = 'unknown';
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| 351 | my $height = 'unknown';
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| 352 |
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| 353 | my $image_safe = quotemeta $image;
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| 354 | if ($result =~ /^$image_safe (\w+) (\d+)x(\d+)/) {
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| 355 | $type = $1;
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| 356 | $width = $2;
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| 357 | $height = $3;
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| 358 | }
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| 359 |
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| 360 | # Read the size
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| 361 | my $size = "unknown";
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| 362 | if ($result =~ m/^.* ([0-9]+)b/) {
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| 363 | $size = $1;
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| 364 | }
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| 365 | elsif ($result =~ m/^.* ([0-9]+)(\.([0-9]+))?kb?/) {
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| 366 | $size = 1024 * $1;
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| 367 | if (defined($2)) {
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| 368 | $size = $size + (1024 * $2);
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| 369 | # Truncate size (it isn't going to be very accurate anyway)
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| 370 | $size = int($size);
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| 371 | }
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| 372 | }
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| 373 | elsif ($result =~ m/^.* (([0-9]+)(\.([0-9]+))?e\+([0-9]+))(kb|b)?/) {
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| 374 | # Deals with file sizes on Linux of type "3.4e+02kb" where e+02 is 1*10^2.
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| 375 | # 3.4e+02 therefore evaluates to 3.4 x 1 x 10^2 = 340kb.
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| 376 | # Programming languages including Perl know how that 3.4e+02 is a number,
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| 377 | # so we don't need to do any calculations.
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| 378 | $size = $1*1; # turn the string into a number by multiplying it by 1
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| 379 | #if we did $size = $1; $size would be merely the string "3.4e+02"
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| 380 | $size = int($size); # truncate size
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| 381 | }
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| 382 | print $outhandle "file: $image:\t $type, $width, $height, $size\n"
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| 383 | if ($verbosity > 2);
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| 384 |
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| 385 | # Return the specs
|
|---|
| 386 | return ($type, $width, $height, $size);
|
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| 387 | }
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| 388 |
|
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| 389 | sub clean_up_temporary_files {
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| 390 | my $self = shift(@_);
|
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| 391 |
|
|---|
| 392 | foreach my $tmp_file_path (@{$self->{'tmp_file_paths'}}) {
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| 393 | if (-e $tmp_file_path) {
|
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| 394 | &util::rm($tmp_file_path);
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|---|
| 395 | }
|
|---|
| 396 | }
|
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| 397 |
|
|---|
| 398 | }
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| 399 |
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| 400 | 1;
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