rem: g_return_val_if_fail (gtx->priv->xine != NULL, 0);
context: gtk_xine_is_fullscreen (GtkXine *gtx){	g_return_val_if_fail (gtx != NULL, 0);	g_return_val_if_fail (GTK_IS_XINE (gtx), 0);	g_return_val_if_fail (gtx->priv->xine != NULL, 0);	return gtx->priv->fullscreen_mode;}