[mutter] window-x11: Fizzle out changes to the three different regions

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

commit 203e5335abab1dbac92e9b09921dfb9d2623ae11
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Jun 27 12:17:28 2014 -0400

    window-x11: Fizzle out changes to the three different regions
    
    GTK+ likes to set these, well, _NET_WM_OPAQUE_REGION in particular, to
    the same value. Save some expensive and processing when this happens. We
    should probably make GTK+ smarter.

 src/x11/window-x11.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/src/x11/window-x11.c b/src/x11/window-x11.c
index e8c279f..059cc81 100644
--- a/src/x11/window-x11.c
+++ b/src/x11/window-x11.c
@@ -1685,6 +1685,9 @@ static void
 meta_window_set_opaque_region (MetaWindow     *window,
                                cairo_region_t *region)
 {
+  if (cairo_region_equal (window->opaque_region, region))
+    return;
+
   g_clear_pointer (&window->opaque_region, cairo_region_destroy);
 
   if (region != NULL)
@@ -1770,6 +1773,9 @@ static void
 meta_window_set_input_region (MetaWindow     *window,
                               cairo_region_t *region)
 {
+  if (cairo_region_equal (window->input_region, region))
+    return;
+
   g_clear_pointer (&window->input_region, cairo_region_destroy);
 
   if (region != NULL)
@@ -1876,6 +1882,9 @@ static void
 meta_window_set_shape_region (MetaWindow     *window,
                               cairo_region_t *region)
 {
+  if (cairo_region_equal (window->shape_region, region))
+    return;
+
   g_clear_pointer (&window->shape_region, cairo_region_destroy);
 
   if (region != NULL)