gdk: add slots for all GdkWindowObject signals

Also add padding for future extension.

gdk/gdkwindow.c

@@ -428,7 +428,7 @@ gdk_window_class_init (GdkWindowObjectClass *klass)
     g_signal_new (g_intern_static_string ("pick-embedded-child"),
 		  G_OBJECT_CLASS_TYPE (object_class),
 		  G_SIGNAL_RUN_LAST,
-		  0,
+                  G_STRUCT_OFFSET (GdkWindowObjectClass, pick_embedded_child),
 		  accumulate_get_window, NULL,
 		  _gdk_marshal_OBJECT__DOUBLE_DOUBLE,
 		  GDK_TYPE_WINDOW,
@@ -455,7 +455,7 @@ gdk_window_class_init (GdkWindowObjectClass *klass)
     g_signal_new (g_intern_static_string ("to-embedder"),
 		  G_OBJECT_CLASS_TYPE (object_class),
 		  G_SIGNAL_RUN_LAST,
-		  0,
+                  G_STRUCT_OFFSET (GdkWindowObjectClass, to_embedder),
 		  NULL, NULL,
 		  _gdk_marshal_VOID__DOUBLE_DOUBLE_POINTER_POINTER,
 		  G_TYPE_NONE,
@@ -484,7 +484,7 @@ gdk_window_class_init (GdkWindowObjectClass *klass)
     g_signal_new (g_intern_static_string ("from-embedder"),
 		  G_OBJECT_CLASS_TYPE (object_class),
 		  G_SIGNAL_RUN_LAST,
-		  0,
+                  G_STRUCT_OFFSET (GdkWindowObjectClass, from_embedder),
 		  NULL, NULL,
 		  _gdk_marshal_VOID__DOUBLE_DOUBLE_POINTER_POINTER,
 		  G_TYPE_NONE,

gdk/gdkwindow.h

@@ -490,9 +490,34 @@ struct _GdkWindowObjectClass
 {
   GdkDrawableClass parent_class;
 
-  cairo_surface_t * (* create_surface) (GdkWindow *window,
-                                        gint       width,
-                                        gint       height);
+  GdkWindow       * (* pick_embedded_child) (GdkWindow *window,
+                                             gdouble    x,
+                                             gdouble    y);
+
+  /*  the following 3 signals will only be emitted by offscreen windows */
+  void              (* to_embedder)         (GdkWindow *window,
+                                             gdouble    offscreen_x,
+                                             gdouble    offscreen_y,
+                                             gdouble   *embedder_x,
+                                             gdouble   *embedder_y);
+  void              (* from_embedder)       (GdkWindow *window,
+                                             gdouble    embedder_x,
+                                             gdouble    embedder_y,
+                                             gdouble   *offscreen_x,
+                                             gdouble   *offscreen_y);
+  cairo_surface_t * (* create_surface)      (GdkWindow *window,
+                                             gint       width,
+                                             gint       height);
+
+  /* Padding for future expansion */
+  void (*_gdk_reserved1) (void);
+  void (*_gdk_reserved2) (void);
+  void (*_gdk_reserved3) (void);
+  void (*_gdk_reserved4) (void);
+  void (*_gdk_reserved5) (void);
+  void (*_gdk_reserved6) (void);
+  void (*_gdk_reserved7) (void);
+  void (*_gdk_reserved8) (void);
 };
 
 /* Windows