-/* xscreensaver, Copyright (c) 1992, 1993, 1994, 1997
+/* xscreensaver, Copyright (c) 1992, 1993, 1994, 1997, 2001
* Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
total kludge. */
extern Bool use_subwindow_mode_p(Screen *screen, Window window);
+/* Whether the given window is:
+ - the real root window;
+ - the virtual root window;
+ - a direct child of the root window;
+ - a direct child of the window manager's decorations.
+ */
+extern Bool top_level_window_p(Screen *screen, Window window);
+
#endif /* __GRABSCREEN_H__ */