gboolean composite_window_has_alpha(Visual *vis);
XID composite_get_window_picture(Window win, Visual *vis);
Pixmap composite_get_window_pixmap(Window win);
gboolean composite_window_has_alpha(Visual *vis);
XID composite_get_window_picture(Window win, Visual *vis);
Pixmap composite_get_window_pixmap(Window win);