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<?php
/*
* FooGallery Retina Support class
*/
if ( !class_exists( 'FooGallery_Retina' ) ) {
class FooGallery_Retina {
function __construct() {
add_filter('foogallery_attachment_html_image_attributes', array($this, 'add_retina_attributes'), 10, 3);
}
/**
* @param array $attr
* @param array $args
* @param FooGalleryAttachment $attachment
* @return mixed
*/
function add_retina_attributes($attr, $args, $attachment) {
global $current_foogallery;
if ( $current_foogallery && $current_foogallery->gallery_template ) {
//first check if the gallery has saved Retina settings
if ( isset($current_foogallery->retina) && is_array( $current_foogallery->retina ) ) {
$srcset = array();
//get the original thumb dimensions
$original_thumb_width = array_key_exists( 'width', $args ) ? intval( $args['width'] ) : 0;
$original_thumb_height = array_key_exists( 'height', $args ) ? intval( $args['height'] ) : 0;
//get the original full size image dimensions
$original_width = $attachment->width;
$original_height = $attachment->height;
//if we do not have a width, we need to calculate one
if ( 0 === $original_thumb_width ) {
//find closest ratio multiple to image size
if( $original_width > $original_height ) {
//landscape
$ratio = $original_width / $original_height;
$original_thumb_width = intval( $original_thumb_height * $ratio );
}else{
//portrait
$ratio = $original_height / $original_width;
$original_thumb_width = intval( $original_thumb_height / $ratio );
}
}
foreach ( foogallery_retina_options() as $pixel_density ) {
$pixel_density_supported = array_key_exists( $pixel_density, $current_foogallery->retina ) ? ('true' === $current_foogallery->retina[$pixel_density]) : false;
if ( $pixel_density_supported ) {
$pixel_density_int = intval( str_replace( 'x', '', $pixel_density ) );
//apply scaling to the width and height attributes
$retina_width = $original_thumb_width * $pixel_density_int;
$retina_height = $original_thumb_height * $pixel_density_int;
//if the new dimensions are smaller than the full size image dimensions then allow the retina thumb
if ( $retina_width < $original_width &&
$retina_height < $original_height ) {
$args['width'] = $retina_width;
$args['height'] = $retina_height;
//build up the retina attributes
$srcset[] = $attachment->html_img_src( $args ) . ' ' . $retina_width . 'w';
}
}
}
if ( count( $srcset ) ) {
$attr['srcset'] = implode( ',', $srcset );
}
}
}
return $attr;
}
}
}