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diff --git a/canvas/source/vcl/canvasbitmaphelper.hxx b/canvas/source/vcl/canvasbitmaphelper.hxx
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+++ b/canvas/source/vcl/canvasbitmaphelper.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 "canvashelper.hxx"
+
+#include <vcl/bitmapex.hxx>
+
+#include "bitmapbackbuffer.hxx"
+
+
+namespace vclcanvas
+{
+    /** Helper class for basic canvasbitmap functionality. Extends
+        CanvasHelper with some CanvasBitmap specialities, such as alpha
+        support.
+
+        Note that a plain CanvasHelper, although it does support the
+        XBitmap interface, has no provision for alpha channel on VCL
+        (at least no efficient one. If the alpha VDev one day gets
+        part of SAL, we might change that).
+     */
+    class CanvasBitmapHelper : public CanvasHelper
+    {
+    public:
+        CanvasBitmapHelper();
+
+        /** Set a new bitmap on this helper.
+
+            This method late-initializes the bitmap canvas helper,
+            providing it with the necessary device and output
+            objects. The internally stored bitmap representation is
+            updated from the given bitmap, including any size
+            changes. Note that the CanvasHelper does <em>not</em> take
+            ownership of the SpriteCanvas object, nor does it perform
+            any reference counting. Thus, to prevent reference counted
+            objects from deletion, the user of this class is
+            responsible for holding ref-counted references to those
+            objects!
+
+            @param rBitmap
+            Content of this bitmap is used as our new content (our
+            internal size is adapted to the size of the bitmap given)
+
+            @param rDevice
+            Reference device for this canvas bitmap
+
+            @param rOutDevProvider
+            Reference output device. Used to create matching bitmap.
+         */
+        void init( const BitmapEx&                              rBitmap,
+                   css::rendering::XGraphicDevice&              rDevice,
+                   const OutDevProviderSharedPtr&               rOutDevProvider );
+
+
+        // Overridden CanvasHelper functionality
+        // =====================================
+
+        void disposing();
+
+        void clear();
+
+        css::geometry::IntegerSize2D getSize() const;
+
+        css::uno::Reference< css::rendering::XBitmap >
+            getScaledBitmap( const css::geometry::RealSize2D&  newSize,
+                             bool                                           beFast );
+
+        css::uno::Sequence< sal_Int8 >
+            getData( css::rendering::IntegerBitmapLayout&      bitmapLayout,
+                     const css::geometry::IntegerRectangle2D&  rect );
+
+        css::uno::Sequence< sal_Int8 >
+            getPixel( css::rendering::IntegerBitmapLayout& bitmapLayout,
+                      const css::geometry::IntegerPoint2D& pos );
+
+        css::rendering::IntegerBitmapLayout getMemoryLayout() const;
+
+        /// @internal
+        BitmapEx getBitmap() const;
+
+    private:
+
+        BitmapBackBufferSharedPtr   mpBackBuffer;
+        OutDevProviderSharedPtr     mpOutDevReference;
+    };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */