dix: add per-screen close notify hook

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

dix/dix_priv.h

@@ -289,4 +289,16 @@ int dixScreenRaiseWindowDestroy(WindowPtr pWin);
  */
 void dixScreenRaiseWindowPosition(WindowPtr pWin, uint32_t x, uint32_t y);
 
+/*
+ * @brief call screen's close hooks
+ * @see dixScreenHookClose
+ * @param pScreen the screen being closed
+ *
+ * Call the pluggable screen close hooks that extensions might have registered on
+ * the screen, and finally call ScreenRec's CloseScreen proc.
+ *
+ * Should only be called by DIX itself.
+ */
+void dixScreenRaiseClose(ScreenPtr pScreen);
+
 #endif /* _XSERVER_DIX_PRIV_H */

dix/screen_hooks.c

@@ -42,6 +42,7 @@
 
 DECLARE_HOOK_LIST(WindowDestroy, _notify_window_destroy)
 DECLARE_HOOK_LIST(WindowPosition, _notify_window_position)
+DECLARE_HOOK_LIST(Close, _notify_screen_close)
 
 int dixScreenRaiseWindowDestroy(WindowPtr pWin)
 {
@@ -72,3 +73,17 @@ void dixScreenRaiseWindowPosition(WindowPtr pWin, uint32_t x, uint32_t y)
     if (pScreen->PositionWindow)
         (*pScreen->PositionWindow) (pWin, x, y);
 }
+
+void dixScreenRaiseClose(ScreenPtr pScreen)
+{
+    if (!pScreen)
+        return;
+
+    ARRAY_FOR_EACH(pScreen->_notify_screen_close, walk) {
+        if (walk.ptr->func)
+            walk.ptr->func(pScreen, walk.ptr->arg);
+    }
+
+    if (pScreen->CloseScreen)
+        (*pScreen->CloseScreen) (pScreen);
+}

include/dix_screen_hooks.h

@@ -108,4 +108,36 @@ _X_EXPORT void dixScreenUnhookWindowPosition(ScreenPtr pScreen,
                                              XorgWindowPositionProcPtr func,
                                              void *arg);
 
+/* prototype of screen close notification handler */
+typedef void (*XorgScreenCloseProcPtr)(ScreenPtr pScreen, void *arg);
+
+/**
+ * @brief register a screen close notify hook on the given screen
+ *
+ * @param pScreen pointer to the screen to register the notify hook into
+ * @param func pointer to the hook function
+ * @param arg opaque pointer passed to the hook
+ *
+ * When registration fails, the server aborts.
+ *
+ **/
+_X_EXPORT void dixScreenHookClose(ScreenPtr pScreen,
+                                  XorgScreenCloseProcPtr func,
+                                  void *arg);
+
+/**
+ * @brief unregister a screen close notify hook on the given screen
+ *
+ * @param pScreen pointer to the screen to unregister the hook from
+ * @param func pointer to the hook function
+ * @param arg opaque pointer passed to the destructor
+ *
+ * @see dixScreenHookClose
+ *
+ * Unregister a screen close notify hook registered via @ref dixScreenHookClose
+ **/
+_X_EXPORT void dixScreenUnhookClose(ScreenPtr pScreen,
+                                    XorgScreenCloseProcPtr func,
+                                    void *arg);
+
 #endif /* DIX_SCREEN_HOOKS_H */

include/scrnintstr.h

@@ -573,6 +573,10 @@ typedef struct _Screen {
        should NOT be touched outside of DIX core */
     _SCREEN_HOOK_TYPE(_notify_window_position, XorgWindowPositionProcPtr, 4);
 
+    /* additional screen close notify hooks (replaces wrapping CloseScreen)
+       should NOT be touched outside of DIX core */
+    _SCREEN_HOOK_TYPE(_notify_screen_close, XorgScreenCloseProcPtr, 8);
+
     /* Pixmap procedures */
 
     CreatePixmapProcPtr CreatePixmap;

include/xorg-server.h.meson.in

@@ -213,5 +213,6 @@
 /* announce server API features */
 #define XORG_API_DIX_SCREEN_HOOK_WINDOW_DESTROY 1
 #define XORG_API_DIX_SCREEN_HOOK_WINDOW_POSITION 1
+#define XORG_API_DIX_SCREEN_HOOK_CLOSE 1
 
 #endif /* _XORG_SERVER_H_ */