1 | ###########################################################################
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2 | #
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3 | # ImagePlugin.pm -- simple text plugin
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 1999 New Zealand Digital Library Project
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9 | #
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10 | # This program is free software; you can redistribute it and/or modify
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11 | # it under the terms of the GNU General Public License as published by
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12 | # the Free Software Foundation; either version 2 of the License, or
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13 | # (at your option) any later version.
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14 | #
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15 | # This program is distributed in the hope that it will be useful,
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16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | # GNU General Public License for more details.
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19 | #
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20 | # You should have received a copy of the GNU General Public License
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21 | # along with this program; if not, write to the Free Software
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22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | #
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24 | ###########################################################################
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25 |
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26 | package ImagePlugin;
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27 |
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28 | use BasePlugin;
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29 | use ImageConverter;
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30 |
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31 | use strict;
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32 | no strict 'refs'; # allow filehandles to be variables and viceversa
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33 |
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34 | sub BEGIN {
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35 | @ImagePlugin::ISA = ('BasePlugin', 'ImageConverter');
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36 | }
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37 |
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38 | my $arguments =
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39 | [ { 'name' => "process_exp",
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40 | 'desc' => "{BasePlugin.process_exp}",
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41 | 'type' => "regexp",
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42 | 'deft' => &get_default_process_exp(),
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43 | 'reqd' => "no" },
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44 | ];
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45 |
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46 | my $options = { 'name' => "ImagePlugin",
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47 | 'desc' => "{ImagePlugin.desc}",
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48 | 'abstract' => "no",
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49 | 'inherits' => "yes",
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50 | 'args' => $arguments };
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51 |
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52 |
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53 |
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54 | sub new {
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55 | my ($class) = shift (@_);
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56 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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57 | push(@$pluginlist, $class);
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58 |
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59 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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60 | push(@{$hashArgOptLists->{"OptList"}},$options);
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61 |
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62 | new ImageConverter($pluginlist, $inputargs, $hashArgOptLists);
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63 | my $self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);
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64 |
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65 | return bless $self, $class;
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66 | }
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67 |
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68 | sub init {
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69 | my $self = shift (@_);
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70 | my ($verbosity, $outhandle, $failhandle) = @_;
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71 |
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72 | $self->SUPER::init(@_);
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73 | $self->ImageConverter::init();
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74 | }
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75 |
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76 | sub get_default_process_exp {
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77 | my $self = shift (@_);
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78 |
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79 | return q^(?i)(\.jpe?g|\.gif|\.png|\.bmp|\.xbm|\.tif?f)$^;
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80 | }
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81 |
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82 | # this makes no sense for images
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83 | sub block_cover_image
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84 | {
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85 | my $self =shift (@_);
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86 | my ($filename) = @_;
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87 |
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88 | return;
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89 | }
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90 |
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91 | # do plugin specific processing of doc_obj
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92 | sub process {
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93 | my $self = shift (@_);
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94 | # options??
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95 | my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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96 |
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97 | my $outhandle = $self->{'outhandle'};
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98 | my ($filename_full_path, $filename_no_path) = $self->get_full_filenames($base_dir, $file);
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99 | if ($self->check_imagemagick()) {
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100 | $self->generate_images($filename_full_path, $filename_no_path, $doc_obj, $doc_obj->get_top_section()); # should we check the return value?
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101 | } else {
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102 | # do some basic stuff
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103 | # associate the image, fileformat, mimetype, srclink, srcicon
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104 | # do this if image magick not installed. but also if generate hasn't worked?? what about images too small?
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105 | }
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106 | #we have no text - adds dummy text and NoText metadata
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107 | $self->add_dummy_text($doc_obj, $doc_obj->get_top_section());
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108 |
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109 | return 1;
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110 |
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111 | }
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112 |
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113 | sub clean_up_after_doc_obj_processing {
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114 | my $self = shift(@_);
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115 |
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116 | $self->ImageConverter::clean_up_temporary_files();
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117 | }
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118 |
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119 | 1;
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120 |
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121 |
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122 |
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123 |
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124 |
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125 |
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126 |
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127 |
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128 |
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129 |
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130 |
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