/**
  * 需要的话就verride 
  * @param FileInfo $fileinfo
  * @param array $destSize
  */
 public function getDestName(FileInfo $fileinfo, array $destSize)
 {
     $info = pathinfo($fileinfo->getPath());
     if ($info['dirname'] && $info['dirname'] != '.') {
         $filename = sprintf('%s%s%s', $info['dirname'], DIRECTORY_SEPARATOR, $info['filename']);
     } else {
         $filename = $info['filename'];
     }
     return sprintf('%s_%dx%d.%s', $filename, $destSize[0], $destSize[1], $info['extension']);
 }