[clutter-gtk] initialization: add support for Mir clutter backend

[Marco Trevisan <marcotrevi src gnome org>]

commit 35aedd7aaa186ded99dde4b0d2f3d0f6c2252c86
Author: Marco Trevisan (Treviño) <marco ubuntu com>
Date:   Fri Feb 20 17:51:15 2015 +0100

    initialization: add support for Mir clutter backend

 clutter-gtk/gtk-clutter-util.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/clutter-gtk/gtk-clutter-util.c b/clutter-gtk/gtk-clutter-util.c
index f66f8a9..f4acfdf 100644
--- a/clutter-gtk/gtk-clutter-util.c
+++ b/clutter-gtk/gtk-clutter-util.c
@@ -39,6 +39,10 @@
 #include <gdk/gdkwayland.h>
 #endif
 
+#if defined(GDK_WINDOWING_MIR)
+#include <gdk/gdkmir.h>
+#endif
+
 /**
  * SECTION:gtk-clutter-util
  * @Title: Utility Functions
@@ -110,6 +114,19 @@ gtk_clutter_init_internal (void)
     }
   else
 #endif
+#if defined(GDK_WINDOWING_MIR) && defined(CLUTTER_WINDOWING_MIR)
+  if (clutter_check_windowing_backend (CLUTTER_WINDOWING_MIR) &&
+      GDK_IS_MIR_DISPLAY (display))
+    {
+      /* let GTK+ be in charge of the event handling */
+      /* This is disabled until Mir does not support sub-surfaces.
+      clutter_mir_disable_event_retrieval ();
+      */
+
+      clutter_mir_set_connection (gdk_mir_display_get_mir_connection (display));
+    }
+  else
+#endif
     g_error ("*** Unsupported backend.");
 
   /* We disable clutter accessibility support in order to not