/**
* Save The Alpha Channel Information For Png Resource
*
* @param Jaguar\Format\Png $png
* @param boolean $flag true to save false to ignore
*
* @return \Jaguar\Format\Png
* @throws \Jaguar\Exception\CanvasException
*/
protected function saveAlpha(Png $png, $flag)
{
if ($flag) {
$png->alphaBlending(false);
if (false == @imagesavealpha($png->getHandler(), $flag)) {
throw new CanvasException(sprintf('Faild Saving The Alpha Channel Information To The Png Canvas "%s"', (string) $this));
}
}
return $this;
}
/**
* {@inheritdoc}
*/
public function isSupported($file)
{
return Png::isPngFile($file);
}
