- xcb_window_t parent_win = scr->root;
-
- /* Check whether the composite extension is available */
- const xcb_query_extension_reply_t *extension_query = NULL;
- xcb_generic_error_t *error = NULL;
- xcb_composite_get_overlay_window_cookie_t cookie;
- xcb_composite_get_overlay_window_reply_t *composite_reply = NULL;
-
- extension_query = xcb_get_extension_data(conn, &xcb_composite_id);
- if (extension_query && extension_query->present) {
- /* When composition is used, we need to use the composite overlay
- * window instead of the normal root window to be able to cover
- * composited windows */
- cookie = xcb_composite_get_overlay_window(conn, scr->root);
- composite_reply = xcb_composite_get_overlay_window_reply(conn, cookie, &error);
-
- if (!error && composite_reply) {
- parent_win = composite_reply->overlay_win;
- }
-
- free(composite_reply);
- free(error);
- }