Tune layout of struct _SharedSurfaceHeader; Change interface of GetWindowSharedSurfaceFD()

include/gdi.h

@@ -1905,11 +1905,10 @@ MG_EXPORT BOOL GUIAPI LockSharedSurfaceIfDirty (HSURF surf,
 
 /**
  * \fn BOOL GUIAPI UnlockSharedSurface (HSURF surf, BOOL clear_dirty)
- * \brief Unocks the shared surface and clears the dirty information.
+ * \brief Unlocks the shared surface and clears the dirty information.
  *
- * This function compares the dirty age of the shared surface with the value
- * containing in \a dirty_age, and lock the shared surface if it has
- * a larger dirty age value.
+ * This function unlocks the shared surface \a surf, and clears its dirty
+ * information if \a clear_dirty is TRUE.
  *
  * \param surf The handle to the shared surface.
  * \param clear_dirty A boolean value indicates whether to clear the dirty

include/window.h

@@ -7238,7 +7238,8 @@ MG_EXPORT BOOL GUIAPI SetMainWindowGestureFlags (HWND hWnd, DWORD dwFlags);
 #ifdef _MGSCHEMA_COMPOSITING
 
 /**
- * \fn int GUIAPI GetWindowSharedSurfaceFD (HWND hwnd)
+ * \fn int GUIAPI GetWindowSharedSurfaceFD (HWND hwnd, size_t *map_size,
+ *      DWORD *flags)
  * \brief Gets the file descriptor of the surface buffer for a window or
  * the main window it locates.
  *
@@ -7258,7 +7259,8 @@ MG_EXPORT BOOL GUIAPI SetMainWindowGestureFlags (HWND hWnd, DWORD dwFlags);
  *
  * Since 5.0.13
  */
-MG_EXPORT int GUIAPI GetWindowSharedSurfaceFD (HWND hWnd);
+MG_EXPORT int GUIAPI GetWindowSharedSurfaceFD (HWND hWnd, size_t *map_size,
+        DWORD *flags);
 
 /**
  * \fn BOOL GUIAPI SetMainWindowCompositing (HWND hWnd,