From 203e5335abab1dbac92e9b09921dfb9d2623ae11 Mon Sep 17 00:00:00 2001
From: "Jasper St. Pierre" <jstpierre@mecheye.net>
Date: Fri, 27 Jun 2014 12:17:28 -0400
Subject: [PATCH] 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 file changed, 9 insertions(+)

diff --git a/src/x11/window-x11.c b/src/x11/window-x11.c
index e8c279f6d..059cc8163 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)