diff -r 000000000000 -r 6474c204b198 gfx/2d/Helpers.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/2d/Helpers.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZILLA_GFX_2D_HELPERS_H_
+#define MOZILLA_GFX_2D_HELPERS_H_
+
+#include "2D.h"
+
+namespace mozilla {
+namespace gfx {
+
+class AutoSaveTransform
+{
+ public:
+  AutoSaveTransform(DrawTarget *aTarget)
+   : mDrawTarget(aTarget),
+     mOldTransform(aTarget->GetTransform())
+  {
+  }
+  ~AutoSaveTransform()
+  {
+    mDrawTarget->SetTransform(mOldTransform);
+  }
+
+ private:
+  RefPtr<DrawTarget> mDrawTarget;
+  Matrix mOldTransform;
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif // MOZILLA_GFX_2D_HELPERS_H_