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116 lines
3.2 KiB
116 lines
3.2 KiB
package Koha::CoverImage;
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# This file is part of Koha.
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#
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# Koha is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# Koha is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Koha; if not, see <http://www.gnu.org/licenses>.
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use Modern::Perl;
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use Carp;
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use GD;
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use Koha::Database;
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use base qw(Koha::Object);
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=head1 NAME
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Koha::CoverImage - Koha CoverImage Object class
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=head1 API
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=head2 Class methods
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=head3 new
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my $cover_image = Koha::CoverImage->new(
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{
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biblionumber => $biblionumber,
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itemnumber => $itemnumber,
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src_image => $image,
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mimetype => $mimetype,
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}
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);
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biblionumber and/or itemnumber must be passed, otherwise the image will not be
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linked to anything.
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src_image must contain the GD image, the fullsize and thumbnail images will be generated
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and stored in the database.
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=cut
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sub new {
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my ( $class, $params ) = @_;
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my $src_image = delete $params->{src_image};
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if ( $src_image ) {
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; # GD autodetects three basic image formats: PNG, JPEG, XPM; we will convert all to PNG which is lossless...
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# Check the pixel size of the image we are about to import...
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my $thumbnail = $class->_scale_image( $src_image, 140, 200 )
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; # MAX pixel dims are 140 X 200 for thumbnail...
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my $fullsize = $class->_scale_image( $src_image, 600, 800 )
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; # MAX pixel dims are 600 X 800 for full-size image...
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$params->{mimetype} = 'image/png';
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$params->{imagefile} = $fullsize->png();
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$params->{thumbnail} = $thumbnail->png();
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}
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return $class->SUPER::new($params);
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}
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sub _scale_image {
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my ( $self, $image, $maxwidth, $maxheight ) = @_;
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my ( $width, $height ) = $image->getBounds();
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if ( $width > $maxwidth || $height > $maxheight ) {
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my $percent_reduce; # Percent we will reduce the image dimensions by...
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if ( $width > $maxwidth ) {
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$percent_reduce =
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sprintf( "%.5f", ( $maxwidth / $width ) )
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; # If the width is oversize, scale based on width overage...
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}
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else {
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$percent_reduce =
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sprintf( "%.5f", ( $maxheight / $height ) )
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; # otherwise scale based on height overage.
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}
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my $width_reduce = sprintf( "%.0f", ( $width * $percent_reduce ) );
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my $height_reduce = sprintf( "%.0f", ( $height * $percent_reduce ) );
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my $newimage = GD::Image->new( $width_reduce, $height_reduce, 1 )
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; #'1' creates true color image...
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$newimage->copyResampled( $image, 0, 0, 0, 0, $width_reduce,
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$height_reduce, $width, $height );
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return $newimage;
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}
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else {
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return $image;
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}
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}
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=head2 Internal methods
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=head3 _type
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=cut
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sub _type {
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return 'CoverImage';
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}
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1;
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