+static Bool error_handler_hit_p = False;
+
+static int
+ignore_all_errors_ehandler (Display *dpy, XErrorEvent *error)
+{
+ error_handler_hit_p = True;
+ return 0;
+}
+
+
+/* Returns True if the given Drawable is a Window; False if it's a Pixmap.
+ */
+static Bool
+drawable_window_p (Display *dpy, Drawable d)
+{
+ XErrorHandler old_handler;
+ XWindowAttributes xgwa;
+
+ XSync (dpy, False);
+ old_handler = XSetErrorHandler (ignore_all_errors_ehandler);
+ error_handler_hit_p = False;
+ XGetWindowAttributes (dpy, d, &xgwa);
+ XSync (dpy, False);
+ XSetErrorHandler (old_handler);
+ XSync (dpy, False);
+
+ if (!error_handler_hit_p)
+ return True; /* It's a Window. */
+ else
+ return False; /* It's a Pixmap, or an invalid ID. */
+}
+
+