[mutter] window: Add a simple meta_window_get_toplevel_xwindow utility

[Jasper St. Pierre <jstpierre src gnome org>]

commit 3e179c07bc7b5aacda99931fefa08caac3a4a0a2
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Dec 6 00:57:11 2013 -0500

    window: Add a simple meta_window_get_toplevel_xwindow utility
    
    To replace all the places where we do:
    
      window->frame ? window->frame->xwindow : window->xwindow
    
    or similar...

 src/compositor/meta-window-actor.c |   17 ++---------------
 src/core/core.c                    |    3 +--
 src/core/display.c                 |    2 +-
 src/core/keybindings.c             |    4 ++--
 src/core/window-private.h          |    2 ++
 src/core/window.c                  |    6 ++++++
 6 files changed, 14 insertions(+), 20 deletions(-)
---
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index 7df162a..87867b9 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -305,11 +305,9 @@ window_decorated_notify (MetaWindow *mw,
 {
   MetaWindowActor        *self     = META_WINDOW_ACTOR (data);
   MetaWindowActorPrivate *priv     = self->priv;
-  MetaFrame              *frame    = meta_window_get_frame (mw);
   MetaScreen             *screen   = priv->screen;
   MetaDisplay            *display  = meta_screen_get_display (screen);
   Display                *xdisplay = meta_display_get_xdisplay (display);
-  Window                  new_xwindow;
 
   /*
    * Basically, we have to reconstruct the the internals of this object
@@ -317,11 +315,6 @@ window_decorated_notify (MetaWindow *mw,
    */
   priv->redecorating = TRUE;
 
-  if (frame)
-    new_xwindow = meta_frame_get_xwindow (frame);
-  else
-    new_xwindow = meta_window_get_xwindow (mw);
-
   meta_window_actor_detach (self);
 
   /*
@@ -336,7 +329,7 @@ window_decorated_notify (MetaWindow *mw,
       priv->damage = None;
     }
 
-  priv->xwindow = new_xwindow;
+  priv->xwindow = meta_window_get_toplevel_xwindow (priv->window);
 
   /*
    * Recreate the contents.
@@ -1615,16 +1608,10 @@ meta_window_actor_new (MetaWindow *window)
   MetaCompScreen         *info = meta_screen_get_compositor_data (screen);
   MetaWindowActor        *self;
   MetaWindowActorPrivate *priv;
-  MetaFrame             *frame;
   Window                 top_window;
   ClutterActor           *window_group;
 
-  frame = meta_window_get_frame (window);
-  if (frame)
-    top_window = meta_frame_get_xwindow (frame);
-  else
-    top_window = meta_window_get_xwindow (window);
-
+  top_window = meta_window_get_toplevel_xwindow (window);
   meta_verbose ("add window: Meta %p, xwin 0x%x\n", window, (guint)top_window);
 
   self = g_object_new (META_TYPE_WINDOW_ACTOR,
diff --git a/src/core/core.c b/src/core/core.c
index 1808f4e..45f9330 100644
--- a/src/core/core.c
+++ b/src/core/core.c
@@ -280,8 +280,7 @@ meta_core_lower_beneath_grab_window (Display *xdisplay,
     return;
 
   changes.stack_mode = Below;
-  changes.sibling = grab_window->frame ? grab_window->frame->xwindow
-                                       : grab_window->xwindow;
+  changes.sibling = meta_window_get_toplevel_xwindow (grab_window);
 
   meta_stack_tracker_record_lower_below (screen->stack_tracker,
                                          xwindow,
diff --git a/src/core/display.c b/src/core/display.c
index c098da5..c9ffb47 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -4008,7 +4008,7 @@ meta_display_begin_grab_op (MetaDisplay *display,
    *   key grab on the RootWindow.
    */
   if (grab_window)
-    grab_xwindow = grab_window->frame ? grab_window->frame->xwindow : grab_window->xwindow;
+    grab_xwindow = meta_window_get_toplevel_xwindow (grab_window);
   else
     grab_xwindow = screen->xroot;
 
diff --git a/src/core/keybindings.c b/src/core/keybindings.c
index 35de8d5..7918a7c 100644
--- a/src/core/keybindings.c
+++ b/src/core/keybindings.c
@@ -1277,7 +1277,7 @@ meta_window_grab_keys (MetaWindow  *window)
     }
 
   meta_window_change_keygrabs (window,
-                               window->frame ? window->frame->xwindow : window->xwindow,
+                               meta_window_get_toplevel_xwindow (window),
                                TRUE);
 
   window->keys_grabbed = TRUE;
@@ -1580,7 +1580,7 @@ meta_window_grab_all_keys (MetaWindow  *window,
               window->desc);
   meta_window_focus (window, timestamp);
 
-  grabwindow = window->frame ? window->frame->xwindow : window->xwindow;
+  grabwindow = meta_window_get_toplevel_xwindow (window);
 
   meta_topic (META_DEBUG_KEYBINDINGS,
               "Grabbing all keys on window %s\n", window->desc);
diff --git a/src/core/window-private.h b/src/core/window-private.h
index 4553d5f..cd29d98 100644
--- a/src/core/window-private.h
+++ b/src/core/window-private.h
@@ -696,4 +696,6 @@ void meta_window_set_shape_region         (MetaWindow     *window,
                                            cairo_region_t *region);
 void meta_window_update_shape_region_x11  (MetaWindow *window);
 
+Window meta_window_get_toplevel_xwindow (MetaWindow *window);
+
 #endif
diff --git a/src/core/window.c b/src/core/window.c
index b9f4455..005336f 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -11438,3 +11438,9 @@ meta_window_can_close (MetaWindow *window)
 {
   return window->has_close_func;
 }
+
+Window
+meta_window_get_toplevel_xwindow (MetaWindow *window)
+{
+  return window->frame ? window->frame->xwindow : window->xwindow;
+}