Info::isSupported

public function isSupported()
{
	static $knownTypes = null;

	if($knownTypes === null)
	{
		$knownTypes = [
			Image::FORMAT_PNG => 1,
			Image::FORMAT_JPEG => 1,
			Image::FORMAT_GIF => 1,
			Image::FORMAT_BMP => 1,
		];
		if(function_exists("imagecreatefromwebp"))
		{
			$knownTypes[Image::FORMAT_WEBP] = 1;
		}
	}

	return isset($knownTypes[$this->getFormat()]);
}