compositor: export actor_is_untransformed function

actor_is_untransformed is a function meta-window-group uses to determine
if an actor is relatively pixel aligned and not contorted. It then
returns the coordinates of the actor.

In a subsequent commit will need the function in a different file, so
this commit separates it out.

https://bugzilla.gnome.org/show_bug.cgi?id=682427

src/compositor/clutter-utils.h

@@ -0,0 +1,36 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/*
+ * Utilities for use with Clutter
+ *
+ * Copyright 2010 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef __META_CLUTTER_UTILS_H__
+#define __META_CLUTTER_UTILS_H__
+
+#include <clutter/clutter.h>
+gboolean meta_actor_vertices_are_untransformed (ClutterVertex *verts,
+                                                float          widthf,
+                                                float          heightf,
+                                                int           *x_origin,
+                                                int           *y_origin);
+gboolean meta_actor_is_untransformed (ClutterActor *actor,
+                                      int          *x_origin,
+                                      int          *y_origin);
+
+#endif /* __META_CLUTTER_UTILS_H__ */