From 768fdd8d3852e67555a585da28b6404a97853cbd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alberts=20Muktup=C4=81vels?= <alberts.muktupavels@gmail.com>
Date: Tue, 21 Jul 2015 03:40:32 +0200
Subject: compositor: fix possible crash closing/destroying window

---
 src/compositor/compositor-private.h |  3 +++
 src/compositor/compositor-xrender.c | 34 +++++++++++++++++++++++++---------
 src/compositor/compositor.c         |  4 ++++
 3 files changed, 32 insertions(+), 9 deletions(-)

diff --git a/src/compositor/compositor-private.h b/src/compositor/compositor-private.h
index 93f3e05b..61e7ffb0 100644
--- a/src/compositor/compositor-private.h
+++ b/src/compositor/compositor-private.h
@@ -50,6 +50,9 @@ struct _MetaCompositor
                              MetaScreen     *screen,
                              MetaWindow     *window);
 
+  void (*free_window) (MetaCompositor *compositor,
+                       MetaWindow     *window);
+
   void (*maximize_window)   (MetaCompositor *compositor,
                              MetaWindow     *window);
   void (*unmaximize_window) (MetaCompositor *compositor,
diff --git a/src/compositor/compositor-xrender.c b/src/compositor/compositor-xrender.c
index 623d6ce8..c1218ebc 100644
--- a/src/compositor/compositor-xrender.c
+++ b/src/compositor/compositor-xrender.c
@@ -2681,23 +2681,38 @@ xrender_end_move (MetaCompositor *compositor,
 #ifdef HAVE_COMPOSITE_EXTENSIONS
 #endif
 }
+#endif /* 0 */
 
 static void
 xrender_free_window (MetaCompositor *compositor,
                      MetaWindow     *window)
 {
 #ifdef HAVE_COMPOSITE_EXTENSIONS
-  /* FIXME: When an undecorated window is hidden this is called,
-     but the window does not get readded if it is subsequentally shown again
-     See http://bugzilla.gnome.org/show_bug.cgi?id=504876
-
-     I don't *think* theres any need for this call anyway, leaving it out
-     does not seem to cause any side effects so far, but I should check with
-     someone who understands more. */
-  /* destroy_win (compositor->display, window->xwindow, FALSE); */
+  MetaCompositorXRender *xrc;
+  MetaFrame *frame;
+  Window xwindow;
+
+  xrc = (MetaCompositorXRender *) compositor;
+  frame = meta_window_get_frame (window);
+  xwindow = None;
+
+  if (frame)
+    {
+      xwindow = meta_frame_get_xwindow (frame);
+    }
+  else
+    {
+      /* FIXME: When an undecorated window is hidden this is called, but the
+       * window does not get readded if it is subsequentally shown again. See:
+       * http://bugzilla.gnome.org/show_bug.cgi?id=504876
+       */
+      /* xwindow = meta_window_get_xwindow (window); */
+    }
+
+  if (xwindow != None)
+    destroy_win (xrc->display, xwindow, FALSE);
 #endif
 }
-#endif /* 0 */
 
 static void
 xrender_process_event (MetaCompositor *compositor,
@@ -2979,6 +2994,7 @@ static MetaCompositor comp_info = {
   xrender_process_event,
   xrender_get_window_pixmap,
   xrender_set_active_window,
+  xrender_free_window,
   xrender_maximize_window,
   xrender_unmaximize_window,
 };
diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index d23fe3f7..f7a28261 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -156,6 +156,10 @@ void meta_compositor_end_move (MetaCompositor *compositor,
 void meta_compositor_free_window (MetaCompositor *compositor,
                                   MetaWindow     *window)
 {
+#ifdef HAVE_COMPOSITE_EXTENSIONS
+  if (compositor && compositor->free_window)
+    compositor->free_window (compositor, window);
+#endif
 }
 
 void
-- 
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