[gtk+] examples: Port example to use cairo region API

[Benjamin Otte <otte src gnome org>]

commit 6c5dffd1a39133753b865880f1674e6b82d480d2
Author: Benjamin Otte <otte redhat com>
Date:   Mon Jun 28 16:19:30 2010 +0200

    examples: Port example to use cairo region API
    
    https://bugzilla.gnome.org/show_bug.cgi?id=613284

 examples/gdk/composited-window-example.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/examples/gdk/composited-window-example.c b/examples/gdk/composited-window-example.c
index b28f712..dbb49ec 100644
--- a/examples/gdk/composited-window-example.c
+++ b/examples/gdk/composited-window-example.c
@@ -45,7 +45,7 @@ static gboolean
 window_expose_event (GtkWidget      *widget,
 		     GdkEventExpose *event)
 {
-  GdkRegion *region;
+  cairo_region_t *region;
   GtkWidget *child;
   cairo_t *cr;
 
@@ -61,10 +61,11 @@ window_expose_event (GtkWidget      *widget,
 			       child->allocation.y);
 
   /* draw no more than our expose event intersects our child */
-  region = gdk_region_rectangle (&child->allocation);
-  gdk_region_intersect (region, event->region);
+  region = cairo_region_create_rectangle (&child->allocation);
+  cairo_region_intersect (region, region, event->region);
   gdk_cairo_region (cr, region);
   cairo_clip (cr);
+  cairo_region_destroy (region);
 
   /* composite, with a 50% opacity */
   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);