lib/Image/Operation/Retina.php
public function filename( $src_filename, $src_extension ) {
		$newbase = $src_filename.'@'.$this->factor.'x'; // add @2x, @3x, @1.5x, etc.
		$new_name = $newbase.'.'.$src_extension;
		return $new_name;
	}
public function filename( $src_filename, $src_extension ) {
		$newbase = $src_filename.'@'.$this->factor.'x'; // add @2x, @3x, @1.5x, etc.
		$new_name = $newbase.'.'.$src_extension;
		return $new_name;
	}
public function filename ( $ src_filename , $ src_extension ) { $ newbase = $ src_filename . '@' . $ this -> factor . 'x' ; // add @2x, @3x, @1.5x, etc. $ new_name = $ newbase . '.' . $ src_extension ; return $ new_name ; }
Generates the final filename based on the source's name and extension

@param   string    $src_filename     the basename of the file (ex: my-awesome-pic)
@param   string    $src_extension    the extension (ex: .jpg)
@return  string    the final filename to be used (ex: my-awesome-pic@2x.jpg)
Generates the final filename based on the source s name and extension