事件循环框架

src/backend/x11/internal.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <xcb/xcb.h>
+
+#include "core/backend.h" /* IWYU pragma: keep */
+
+struct backend_t {
+  xcb_connection_t *conn;
+  xcb_screen_t *screen;
+  int screenp;
+  bool have_xfixes;
+};