/**
* Create image resource
*
* @param string $format
* @return resource
*
* @throws Exception
*/
protected function _imageCreate($format)
{
if (Helper::isJpeg($format)) {
$result = imagecreatefromjpeg($this->_filename);
} elseif (Helper::isPng($format)) {
$result = imagecreatefrompng($this->_filename);
} elseif (Helper::isGif($format)) {
$result = imagecreatefromgif($this->_filename);
} else {
throw new Exception('Invalid image: ' . $this->_filename);
// @codeCoverageIgnore
}
return $result;
}
