Koha/CoverImage.pm

   1 package Koha::CoverImage;
   2
   3 # This file is part of Koha.
   4 #
   5 # Koha is free software; you can redistribute it and/or modify it
   6 # under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # Koha is distributed in the hope that it will be useful, but
  11 # WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with Koha; if not, see <http://www.gnu.org/licenses>.
  17
  18 use Modern::Perl;
  19
  20 use Carp;
  21 use GD;
  22
  23 use Koha::Database;
  24
  25 use base qw(Koha::Object);
  26
  27 =head1 NAME
  28
  29 Koha::CoverImage - Koha CoverImage Object class
  30
  31 =head1 API
  32
  33 =head2 Class methods
  34
  35 =head3 new
  36
  37 my $cover_image = Koha::CoverImage->new(
  38     {
  39         biblionumber => $biblionumber,
  40         itemnumber   => $itemnumber,
  41         src_image    => $image,
  42         mimetype     => $mimetype,
  43     }
  44 );
  45
  46 biblionumber and/or itemnumber must be passed, otherwise the image will not be
  47 linked to anything.
  48
  49 src_image must contain the GD image, the fullsize and thumbnail images will be generated
  50 and stored in the database.
  51
  52 =cut
  53
  54 sub new {
  55     my ( $class, $params ) = @_;
  56
  57     my $src_image = delete $params->{src_image};
  58
  59     if ( $src_image ) {
  60           ; # GD autodetects three basic image formats: PNG, JPEG, XPM; we will convert all to PNG which is lossless...
  61
  62         # Check the pixel size of the image we are about to import...
  63         my $thumbnail = $class->_scale_image( $src_image, 140, 200 )
  64           ;    # MAX pixel dims are 140 X 200 for thumbnail...
  65         my $fullsize = $class->_scale_image( $src_image, 600, 800 )
  66           ;    # MAX pixel dims are 600 X 800 for full-size image...
  67
  68         $params->{mimetype} = 'image/png';
  69         $params->{imagefile} = $fullsize->png();
  70         $params->{thumbnail} = $thumbnail->png();
  71     }
  72
  73     return $class->SUPER::new($params);
  74 }
  75
  76 sub _scale_image {
  77     my ( $self, $image, $maxwidth, $maxheight ) = @_;
  78     my ( $width, $height ) = $image->getBounds();
  79     if ( $width > $maxwidth || $height > $maxheight ) {
  80
  81         my $percent_reduce;  # Percent we will reduce the image dimensions by...
  82         if ( $width > $maxwidth ) {
  83             $percent_reduce =
  84               sprintf( "%.5f", ( $maxwidth / $width ) )
  85               ;    # If the width is oversize, scale based on width overage...
  86         }
  87         else {
  88             $percent_reduce =
  89               sprintf( "%.5f", ( $maxheight / $height ) )
  90               ;    # otherwise scale based on height overage.
  91         }
  92         my $width_reduce  = sprintf( "%.0f", ( $width * $percent_reduce ) );
  93         my $height_reduce = sprintf( "%.0f", ( $height * $percent_reduce ) );
  94         my $newimage = GD::Image->new( $width_reduce, $height_reduce, 1 )
  95           ;        #'1' creates true color image...
  96         $newimage->copyResampled( $image, 0, 0, 0, 0, $width_reduce,
  97             $height_reduce, $width, $height );
  98         return $newimage;
  99     }
 100     else {
 101         return $image;
 102     }
 103 }
 104
 105
 106 =head2 Internal methods
 107
 108 =head3 _type
 109
 110 =cut
 111
 112 sub _type {
 113     return 'CoverImage';
 114 }
 115
 116 1;