/**
* 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);
}
