protected function getImageArray($tag, $block, array $attr_template = null)
 {
     switch ($tag) {
         case ImageExtObject::TAG_IMAGEEXT:
         case ImageExtObject::TAG_IMAGE:
             $image = new ImageExtImage($this->imageExt);
             $image->parse($tag, $block, $attr_template);
             $image->parseFileAttributes();
             return $image->toArray();
             break;
     }
     return null;
 }