- * @x: address of #gint to put x coordinate
- * @y: address of #gint to put y coordinate
- * @width: address of #gint to put width
- * @height: address of #gint to put height
+ * @x: (out) (optional): address of #gint to put x coordinate
+ * @y: (out) (optional): address of #gint to put y coordinate
+ * @width: (out) (optional): address of #gint to put width
+ * @height: (out) (optional): address of #gint to put height