code: public function getCacheName()
  	{
  		$importantPart = $this->getImportantPart();
  
  		$strCacheKey = substr(md5
  		(
  			  '-w' . $this->getTargetWidth()
  			. '-h' . $this->getTargetHeight()
  			. '-o' . $this->getOriginalPath()
  			. '-m' . $this->getResizeMode()
  			. '-z' . $this->getZoomLevel()
  			. '-x' . $importantPart['x']
  			. '-y' . $importantPart['y']
  			. '-i' . $importantPart['width']
  			. '-e' . $importantPart['height']
  			. '-t' . $this->fileObj->mtime
  		), 0, 8);
  
  		return StringUtil::stripRootDir(System::getContainer()->getParameter('contao.image.target_dir')) . '/' . substr($strCacheKey, -1) . '/' . $this->fileObj->filename . '-' . $strCacheKey . '.' . $this->fileObj->extension;
  	}
docs: Get the cache name
  
  @return string The cache name