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diff --git a/canvas/source/directx/dx_spritedevicehelper.hxx b/canvas/source/directx/dx_spritedevicehelper.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 .
+ */
+
+#ifndef INCLUDED_CANVAS_SOURCE_DIRECTX_DX_SPRITEDEVICEHELPER_HXX
+#define INCLUDED_CANVAS_SOURCE_DIRECTX_DX_SPRITEDEVICEHELPER_HXX
+
+#include <com/sun/star/awt/Rectangle.hpp>
+#include <com/sun/star/rendering/XGraphicDevice.hpp>
+#include <com/sun/star/rendering/XBufferController.hpp>
+
+#include "dx_rendermodule.hxx"
+#include "dx_surfacebitmap.hxx"
+#include "dx_devicehelper.hxx"
+
+#include <rendering/isurfaceproxymanager.hxx>
+
+
+namespace dxcanvas
+{
+    class SpriteCanvas;
+
+    class SpriteDeviceHelper : public DeviceHelper
+    {
+    public:
+        SpriteDeviceHelper();
+
+        void init( vcl::Window&                             rWindow,
+                   SpriteCanvas&                            rSpriteCanvas,
+                   const css::awt::Rectangle&               rRect,
+                   bool                                     bFullscreen );
+
+        /// Dispose all internal references
+        void disposing();
+
+        // partial override XWindowGraphicDevice
+        css::uno::Reference< css::rendering::XBitmap > createCompatibleBitmap(
+            const css::uno::Reference< css::rendering::XGraphicDevice >&  rDevice,
+            const css::geometry::IntegerSize2D&                                        size );
+        css::uno::Reference< css::rendering::XVolatileBitmap > createVolatileBitmap(
+            const css::uno::Reference< css::rendering::XGraphicDevice >&  rDevice,
+            const css::geometry::IntegerSize2D&                                        size );
+        css::uno::Reference< css::rendering::XBitmap > createCompatibleAlphaBitmap(
+            const css::uno::Reference< css::rendering::XGraphicDevice >&  rDevice,
+            const css::geometry::IntegerSize2D&                                        size );
+        css::uno::Reference< css::rendering::XVolatileBitmap > createVolatileAlphaBitmap(
+            const css::uno::Reference< css::rendering::XGraphicDevice >&  rDevice,
+            const css::geometry::IntegerSize2D&                                        size );
+
+        void        destroyBuffers(  );
+        bool showBuffer( bool bIsVisible, bool bUpdateAll );
+        bool switchBuffer( bool bIsVisible, bool bUpdateAll );
+
+        const IDXRenderModuleSharedPtr& getRenderModule() const { return mpRenderModule; }
+        const DXSurfaceBitmapSharedPtr& getBackBuffer() const { return mpBackBuffer; }
+        const std::shared_ptr<canvas::ISurfaceProxyManager> &getSurfaceProxy() const { return mpSurfaceProxyManager; }
+
+        css::uno::Any isAccelerated() const;
+
+        void notifySizeUpdate( const css::awt::Rectangle& rBounds );
+
+        /** called when DumpScreenContent property is enabled on
+            XGraphicDevice, and writes out bitmaps of current screen.
+         */
+        void dumpScreenContent() const;
+
+    private:
+        void resizeBackBuffer( const ::basegfx::B2ISize& rNewSize );
+        HWND getHwnd() const;
+
+        /// Pointer to sprite canvas (owner of this helper), needed to create bitmaps
+        SpriteCanvas*                           mpSpriteCanvas;
+
+        DXSurfaceBitmapSharedPtr                mpBackBuffer;
+
+        /// Instance passing out HW textures
+        std::shared_ptr<canvas::ISurfaceProxyManager> mpSurfaceProxyManager;
+
+        /// Our encapsulation interface to DirectX
+        IDXRenderModuleSharedPtr                mpRenderModule;
+    };
+}
+
+#endif // INCLUDED_CANVAS_SOURCE_DIRECTX_DX_SPRITEDEVICEHELPER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */