/** * Return true if the file is of a type that can't be directly * rendered by typical browsers and needs to be re-rasterized. * * This returns true for everything but the bitmap types * supported by all browsers, i.e. JPEG; GIF and PNG. It will * also return true for any non-image formats. * * @return bool */ function mustRender() { return $this->getHandler() && $this->handler->mustRender($this); }