/**
* Constructor for the cache entry.
*
* @param FileCache $cache The cache object.
* @param string $destination The file to create.
* @param array $userdata An array with the path of the original image and the options to use
* to create the thumbnail.
* @throws Exception
*/
public function get_construct(FileCache $cache, $destination, $userdata)
{
list($path, $options) = $userdata;
$callback = null;
if ($options['background'] != 'transparent') {
self::$background = self::decode_background($options['background']);
$callback = __CLASS__ . '::fill_callback';
}
$image = Image::load($path, $info);
if (!$image) {
throw new Exception('Unable to load image from file %path', array('%path' => $path));
}
#
# resize image
#
$w = $options['width'];
$h = $options['height'];
list($ow, $oh) = $info;
$method = $options['method'];
if ($options['no-upscale']) {
if ($method == Image::RESIZE_SURFACE) {
if ($w * $h > $ow * $oh) {
$w = $ow;
$h = $oh;
}
} else {
if ($w > $ow) {
$w = $ow;
}
if ($h > $oh) {
$h = $ow;
}
}
}
$image = Image::resize($image, $w, $h, $method, $callback);
if (!$image) {
throw new Exception('Unable to resize image for file %path with options: !options', array('%path' => $path, '!options' => $options));
}
#
# apply filters
#
$filter = $options['filter'];
if ($filter) {
$this->apply_filter($image, $filter);
}
#
# apply the overlay
#
if ($options['overlay']) {
$overlay_file = \ICanBoogie\DOCUMENT_ROOT . $options['overlay'];
list($o_w, $o_h) = getimagesize($overlay_file);
$overlay_source = imagecreatefrompng($overlay_file);
imagecopyresampled($image, $overlay_source, 0, 0, 0, 0, $w, $h, $o_w, $o_h);
}
#
# interlace
#
if (!$options['no-interlace']) {
imageinterlace($image, true);
}
#
# choose export format
#
$format = $options['format'];
static $functions = array('gif' => 'imagegif', 'jpeg' => 'imagejpeg', 'png' => 'imagepng');
$function = $functions[$format];
$args = array($image, $destination);
if ($format == 'jpeg') {
#
# add quality option for the 'jpeg' format
#
$args[] = $options['quality'];
} else {
if ($format == 'png' && !$callback) {
#
# If there is no background callback defined, the image is defined as transparent in
# order to obtain a transparent thumbnail when the resulting image is centered.
#
imagealphablending($image, false);
imagesavealpha($image, true);
}
}
$rc = call_user_func_array($function, $args);
imagedestroy($image);
if (!$rc) {
throw new Exception('Unable to save thumbnail');
}
return $destination;
}
