https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=33674
Bug ID: 33674
Summary: Landscape cover images are resized ignoring if
image/book cover width > height
Change sponsored?: ---
Product: Koha
Version: 21.11
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P5 - low
Component: Cataloging
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected]
The code fragments below (/Koha/CoverImage.pm) need to determine if the width
is greater than the height before resizing and creating the thumbnails and
'fullsize' image version. Otherwise wide books are always resized as if they
were tall books. As a result the thumbnails and fullsize images of wide books
are always scaled smaller than their 'portrait' counterparts.
Needless to say these hardcoded values should be part of system preferences.
They were set before the days of 4K monitors. I think that might be an open
item.
sub new {
my ( $class, $params ) = @_;
my $src_image = delete $params->{src_image};
if ( $src_image ) {
; # 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 = $class->_scale_image( $src_image, 140, 200 )
; # MAX pixel dims are 140 X 200 for thumbnail...
my $fullsize = $class->_scale_image( $src_image, 600, 800 )
; # MAX pixel dims are 600 X 800 for full-size image...
$params->{mimetype} = 'image/png';
$params->{imagefile} = $fullsize->png();
$params->{thumbnail} = $thumbnail->png();
}
return $class->SUPER::new($params);
}
sub _scale_image {
my ( $self, $image, $maxwidth, $maxheight ) = @_;
my ( $width, $height ) = $image->getBounds();
if ( $width > $maxwidth || $height > $maxheight ) {
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 ) );
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;
}
}
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