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diff --git a/canvas/inc/rendering/isurfaceproxymanager.hxx b/canvas/inc/rendering/isurfaceproxymanager.hxx
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+++ b/canvas/inc/rendering/isurfaceproxymanager.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 <canvas/canvastoolsdllapi.h>
+#include <memory>
+
+namespace canvas
+{
+    struct ISurfaceProxy;
+    struct IColorBuffer;
+    struct IRenderModule;
+
+    /** Manager interface, which handles surface proxy objects.
+
+        Typically, each canvas instantiation has one
+        SurfaceProxyManager object, to handle their surfaces. Surfaces
+        itself are opaque objects, which encapsulate a framebuffer to
+        render upon, plus an optional (possibly accelerated) texture.
+     */
+    struct ISurfaceProxyManager
+    {
+        virtual ~ISurfaceProxyManager() {}
+
+        /** Create a surface proxy for a color buffer.
+
+            The whole idea is build around the concept that you create
+            some arbitrary buffer which contains the image data and
+            tell the texture manager about it.  From there on you can
+            draw into this image using any kind of graphics api you
+            want.  In the technical sense we allocate some space in
+            local videomemory or AGP memory which will be filled on
+            demand, which means if there exists any rendering
+            operation that needs to read from this memory location.
+            This method creates a logical hardware surface object
+            which uses the given color buffer as the image source.
+            Internally this texture may even be distributed to several
+            real hardware surfaces.
+        */
+        virtual std::shared_ptr< ISurfaceProxy > createSurfaceProxy(
+            const std::shared_ptr<IColorBuffer>& pBuffer ) const = 0;
+    };
+
+    /** Create a surface proxy for the given render module.
+     */
+    CANVASTOOLS_DLLPUBLIC std::shared_ptr<ISurfaceProxyManager> createSurfaceProxyManager( const std::shared_ptr<IRenderModule>& rRenderModule );
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */