[gtk+] Make gdk_drawable_get_visible/clip_region handle the !viewable case

[Alexander Larsson <alexl src gnome org>]

commit 36861cf6088442bfe438be6b48a1b19c85c61a01
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Jul 20 22:30:48 2009 +0200

    Make gdk_drawable_get_visible/clip_region handle the !viewable case
    
    We can't access ->clip_region for these cases as its not yet calculated.

 gdk/gdkwindow.c |   21 ++++++++++++---------
 1 files changed, 12 insertions(+), 9 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index a3718bb..9ceb5d1 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -3494,12 +3494,23 @@ gdk_window_get_composite_drawable (GdkDrawable *drawable,
 }
 
 static GdkRegion*
+gdk_window_get_visible_region (GdkDrawable *drawable)
+{
+  GdkWindowObject *private = (GdkWindowObject*) drawable;
+
+  if (private->viewable)
+    return gdk_region_copy (private->clip_region);
+  else
+    return gdk_region_new ();
+}
+
+static GdkRegion*
 gdk_window_get_clip_region (GdkDrawable *drawable)
 {
   GdkWindowObject *private = (GdkWindowObject *)drawable;
   GdkRegion *result;
 
-  result = gdk_region_copy (private->clip_region);
+  result = gdk_window_get_visible_region (drawable);
 
   if (private->paint_stack)
     {
@@ -3522,14 +3533,6 @@ gdk_window_get_clip_region (GdkDrawable *drawable)
   return result;
 }
 
-static GdkRegion*
-gdk_window_get_visible_region (GdkDrawable *drawable)
-{
-  GdkWindowObject *private = (GdkWindowObject*) drawable;
-
-  return gdk_region_copy (private->clip_region);
-}
-
 static void
 gdk_window_draw_drawable (GdkDrawable *drawable,
 			  GdkGC       *gc,