[gtk+] gdkwindow: Remove an extra region copy

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

commit 47d6677e92bb364b6a58fad624d89ebb4a0fc6dd
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sat Jun 21 10:33:40 2014 -0400

    gdkwindow: Remove an extra region copy
    
    This code is only called with the current paint region as its argument.
    Instead of having to copy it and do a no-op intersect against itself,
    just use the current paint directly.

 gdk/gdkwindow.c |   13 +++----------
 1 files changed, 3 insertions(+), 10 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index dd21713..a0da4c4 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -2773,7 +2773,7 @@ gdk_window_begin_paint_region (GdkWindow       *window,
     }
 
   if (!cairo_region_is_empty (window->current_paint.region))
-    gdk_window_clear_backing_region (window, window->current_paint.region);
+    gdk_window_clear_backing_region (window);
 }
 
 /**
@@ -2942,10 +2942,8 @@ gdk_window_get_visible_region (GdkWindow *window)
 }
 
 static void
-gdk_window_clear_backing_region (GdkWindow *window,
-                                cairo_region_t *region)
+gdk_window_clear_backing_region (GdkWindow *window)
 {
-  cairo_region_t *clip;
   GdkWindow *bg_window;
   cairo_pattern_t *pattern = NULL;
   int x_offset = 0, y_offset = 0;
@@ -2975,15 +2973,10 @@ gdk_window_clear_backing_region (GdkWindow *window,
   else
     cairo_set_source_rgb (cr, 0, 0, 0);
 
-  clip = cairo_region_copy (window->current_paint.region);
-  cairo_region_intersect (clip, region);
-
-  gdk_cairo_region (cr, clip);
+  gdk_cairo_region (cr, window->current_paint.region);
   cairo_fill (cr);
 
   cairo_destroy (cr);
-
-  cairo_region_destroy (clip);
 }
 
 /* This returns either the current working surface on the paint stack