Koha/C4/Images.pm
Chris Cormack 509d673f10 Bug 7941 : Fix version numbers in modules
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
2012-06-11 17:29:38 +02:00

214 lines
6.1 KiB
Perl

package C4::Images;
# Copyright (C) 2011 C & P Bibliography Services
# Jared Camins-Esakov <jcamins@cpbibliograpy.com>
#
# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with Koha; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
use strict;
use warnings;
use 5.010;
use C4::Context;
use GD;
use vars qw($debug $noimage $VERSION @ISA @EXPORT);
BEGIN {
# set the version for version checking
$VERSION = 3.07.00.049;
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(
&PutImage
&RetrieveImage
&ListImagesForBiblio
&DelImage
);
$debug = $ENV{KOHA_DEBUG} || $ENV{DEBUG} || 0;
$noimage = pack( "H*",
'47494638396101000100800000FFFFFF'
. '00000021F90401000000002C00000000'
. '010001000002024401003B' );
}
=head2 PutImage
PutImage($biblionumber, $srcimage, $replace);
Stores binary image data and thumbnail in database, optionally replacing existing images for the given biblio.
=cut
sub PutImage {
my ( $biblionumber, $srcimage, $replace ) = @_;
return -1 unless defined($srcimage);
if ($replace) {
foreach ( ListImagesForBiblio($biblionumber) ) {
DelImage($_);
}
}
my $dbh = C4::Context->dbh;
my $query =
"INSERT INTO biblioimages (biblionumber, mimetype, imagefile, thumbnail) VALUES (?,?,?,?);";
my $sth = $dbh->prepare($query);
my $mimetype = 'image/png'
; # GD autodetects three basic image formats: PNG, JPEG, XPM; we will convert all to PNG which is lossless...
# Check the pixel size of the image we are about to import...
my $thumbnail = _scale_image( $srcimage, 140, 200 )
; # MAX pixel dims are 140 X 200 for thumbnail...
my $fullsize = _scale_image( $srcimage, 600, 800 )
; # MAX pixel dims are 600 X 800 for full-size image...
$debug and warn "thumbnail is " . length($thumbnail) . " bytes.";
$sth->execute( $biblionumber, $mimetype, $fullsize->png(),
$thumbnail->png() );
my $dberror = $sth->errstr;
warn "Error returned inserting $biblionumber.$mimetype." if $sth->errstr;
undef $thumbnail;
undef $fullsize;
return $dberror;
}
=head2 RetrieveImage
my ($imagedata, $error) = RetrieveImage($imagenumber);
Retrieves the specified image.
=cut
sub RetrieveImage {
my ($imagenumber) = @_;
my $dbh = C4::Context->dbh;
my $query =
'SELECT mimetype, imagefile, thumbnail FROM biblioimages WHERE imagenumber = ?';
my $sth = $dbh->prepare($query);
$sth->execute($imagenumber);
my $imagedata = $sth->fetchrow_hashref;
if ( !$imagedata ) {
$imagedata->{'thumbnail'} = $noimage;
$imagedata->{'imagefile'} = $noimage;
}
if ( $sth->err ) {
warn "Database error!" if $debug;
}
return $imagedata;
}
=head2 ListImagesForBiblio
my (@images) = ListImagesForBiblio($biblionumber);
Gets a list of all images associated with a particular biblio.
=cut
sub ListImagesForBiblio {
my ($biblionumber) = @_;
my @imagenumbers;
my $dbh = C4::Context->dbh;
my $query = 'SELECT imagenumber FROM biblioimages WHERE biblionumber = ?';
my $sth = $dbh->prepare($query);
$sth->execute($biblionumber);
warn "Database error!" if $sth->errstr;
if ( !$sth->errstr && $sth->rows > 0 ) {
while ( my $row = $sth->fetchrow_hashref ) {
push @imagenumbers, $row->{'imagenumber'};
}
return @imagenumbers;
}
else {
return undef;
}
}
=head2 DelImage
my ($dberror) = DelImage($imagenumber);
Removes the image with the supplied imagenumber.
=cut
sub DelImage {
my ($imagenumber) = @_;
warn "Imagenumber passed to DelImage is $imagenumber" if $debug;
my $dbh = C4::Context->dbh;
my $query = "DELETE FROM biblioimages WHERE imagenumber = ?;";
my $sth = $dbh->prepare($query);
$sth->execute($imagenumber);
my $dberror = $sth->errstr;
warn "Database error!" if $sth->errstr;
return $dberror;
}
sub _scale_image {
my ( $image, $maxwidth, $maxheight ) = @_;
my ( $width, $height ) = $image->getBounds();
$debug and warn "image is $width pix X $height pix.";
if ( $width > $maxwidth || $height > $maxheight ) {
# $debug and warn "$filename exceeds the maximum pixel dimensions of $maxwidth X $maxheight. Resizing...";
my $percent_reduce; # Percent we will reduce the image dimensions by...
if ( $width > $maxwidth ) {
$percent_reduce =
sprintf( "%.5f", ( $maxwidth / $width ) )
; # If the width is oversize, scale based on width overage...
}
else {
$percent_reduce =
sprintf( "%.5f", ( $maxheight / $height ) )
; # otherwise scale based on height overage.
}
my $width_reduce = sprintf( "%.0f", ( $width * $percent_reduce ) );
my $height_reduce = sprintf( "%.0f", ( $height * $percent_reduce ) );
$debug
and warn "Reducing image by "
. ( $percent_reduce * 100 )
. "\% or to $width_reduce pix X $height_reduce pix";
my $newimage = GD::Image->new( $width_reduce, $height_reduce, 1 )
; #'1' creates true color image...
$newimage->copyResampled( $image, 0, 0, 0, 0, $width_reduce,
$height_reduce, $width, $height );
return $newimage;
}
else {
return $image;
}
}
=head2 NoImage
C4::Images->NoImage;
Returns the gif to be used when there is no image matching the request, and
its mimetype (image/gif).
=cut
sub NoImage {
return $noimage, 'image/gif';
}
1;