CakePHP: Displaying images that are outside the public accessible directory (webroot) using Media Views

//This goes into the controller
    /**
     * @param $filename A filename without the path. EG: default-guy.jpg
     */
    public function downloadimage($filename) {
        $file_parts = pathinfo($filename);
        $this->viewClass = 'Media';
        $params = array(
            'id'        => $filename,
            'name'      => $file_parts['basename'],
            'download'  => false,
            'extension' => $file_parts['extension'],
            'path'      =>Configure::read('App.uploads_temp'). DS
        );
        $this->set($params);
    }

    http://yourapp.com/entries/downloadimage/sample-image.jpg