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diff --git a/canvas/source/vcl/outdevprovider.hxx b/canvas/source/vcl/outdevprovider.hxx
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+++ b/canvas/source/vcl/outdevprovider.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <memory>
+
+class OutputDevice;
+
+namespace vclcanvas
+{
+    /* Definition of OutDevProvider interface */
+
+    /** Implementers of this interface provide the CanvasHelper
+        with its OutputDevice.
+
+        This additional level of indirection was necessary, as the
+        OutputDevice is not an interface. There had to be a mechanism
+        to detect the moment when an OutputDevice is rendered to
+        (e.g. for the BitmapBackBuffer).
+     */
+    class OutDevProvider
+    {
+    public:
+        virtual ~OutDevProvider() {}
+
+        virtual OutputDevice&       getOutDev() = 0;
+        virtual const OutputDevice& getOutDev() const = 0;
+    };
+
+    typedef std::shared_ptr< OutDevProvider > OutDevProviderSharedPtr;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */