public function setFromData($data, $file_name, $mime_type = false, $fmod_time = false)
 {
     parent::setFromData($data, $file_name, $mime_type, $fmod_time);
     if (is_resource($this->image_rsrc)) {
         imagedestroy($this->image_rsrc);
         $this->createImageResource();
     }
 }