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diff --git a/canvas/source/directx/dx_devicehelper.hxx b/canvas/source/directx/dx_devicehelper.hxx
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+++ b/canvas/source/directx/dx_devicehelper.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 <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_bitmap.hxx"
+
+#include <rendering/isurfaceproxymanager.hxx>
+#include <vcl/vclptr.hxx>
+
+class OutputDevice;
+/* Definition of DeviceHelper class */
+
+namespace dxcanvas
+{
+    class DeviceHelper
+    {
+    public:
+        DeviceHelper();
+        ~DeviceHelper();
+
+        /// make noncopyable
+        DeviceHelper(const DeviceHelper&) = delete;
+        const DeviceHelper& operator=(const DeviceHelper&) = delete;
+
+        /** Init the device helper
+
+            @param hdc
+            private or class dc of the output device. is only stored,
+            not release
+
+            @param rDevice
+            Ref back to owning UNO device
+         */
+        void init( HDC hdc, OutputDevice* pOutputDev,
+                   css::rendering::XGraphicDevice& rDevice );
+
+        /// Dispose all internal references
+        void disposing();
+
+        // XWindowGraphicDevice
+        css::geometry::RealSize2D getPhysicalResolution();
+        css::geometry::RealSize2D getPhysicalSize();
+        css::uno::Reference< css::rendering::XLinePolyPolygon2D > createCompatibleLinePolyPolygon(
+            const css::uno::Reference< css::rendering::XGraphicDevice >&                               rDevice,
+            const css::uno::Sequence< css::uno::Sequence< css::geometry::RealPoint2D > >& points );
+        css::uno::Reference< css::rendering::XBezierPolyPolygon2D > createCompatibleBezierPolyPolygon(
+            const css::uno::Reference< css::rendering::XGraphicDevice >&                                       rDevice,
+            const css::uno::Sequence< css::uno::Sequence< css::geometry::RealBezierSegment2D > >& points );
+        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 );
+
+        css::uno::Any isAccelerated() const;
+        css::uno::Any getDeviceHandle() const;
+        css::uno::Any getSurfaceHandle() const;
+        css::uno::Reference<
+            css::rendering::XColorSpace > getColorSpace() const;
+
+        /** called when DumpScreenContent property is enabled on
+            XGraphicDevice, and writes out bitmaps of current screen.
+         */
+        void dumpScreenContent() const {}
+
+    protected:
+        HDC getHDC() const { return mnHDC; }
+        css::rendering::XGraphicDevice* getDevice() const { return mpDevice; }
+
+    private:
+        /** Phyical output device
+
+            Deliberately not a refcounted reference, because of
+            potential circular references for canvas. Needed to
+            create bitmaps
+         */
+        css::rendering::XGraphicDevice*            mpDevice;
+        HDC                                        mnHDC;
+        VclPtr<OutputDevice>                       mpOutDev;
+    };
+
+    typedef ::rtl::Reference< css::rendering::XGraphicDevice > DeviceRef;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */