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diff --git a/canvas/source/cairo/cairo_devicehelper.hxx b/canvas/source/cairo/cairo_devicehelper.hxx
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+++ b/canvas/source/cairo/cairo_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/rendering/XGraphicDevice.hpp>
+
+#include <vcl/outdev.hxx>
+
+#include "cairo_surfaceprovider.hxx"
+
+/* Definition of DeviceHelper class */
+
+namespace cairocanvas
+{
+    class DeviceHelper
+    {
+    public:
+        /// make noncopyable
+        DeviceHelper(const DeviceHelper&) = delete;
+        const DeviceHelper& operator=(const DeviceHelper&) = delete;
+
+        DeviceHelper();
+
+        /** init helper
+
+            @param rCanvas
+            Owning canvas.
+
+            @param rRefDevice
+            Reference output device. Needed for resolution
+            calculations etc.
+         */
+        void init( SurfaceProvider& rSurfaceProvider,
+                   OutputDevice&    rRefDevice );
+
+        /// 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 > const & getColorSpace() const;
+
+        /** called when DumpScreenContent property is enabled on
+            XGraphicDevice, and writes out bitmaps of current screen.
+         */
+        void dumpScreenContent() const;
+
+        OutputDevice* getOutputDevice() const { return mpRefDevice; }
+        const ::cairo::SurfaceSharedPtr& getSurface() const { return mpSurface; }
+        ::cairo::SurfaceSharedPtr createSurface( const ::basegfx::B2ISize& rSize, int aContent );
+        ::cairo::SurfaceSharedPtr createSurface( BitmapSystemData const & rData, const Size& rSize );
+
+    protected:
+        /** init helper
+
+            @param rCanvas
+            Owning canvas.
+
+            @param rRefDevice
+            Reference output device. Needed for resolution
+            calculations etc.
+         */
+        void implInit( SurfaceProvider& rSurfaceProvider,
+                       OutputDevice&    rRefDevice );
+        void setSize( const ::basegfx::B2ISize& rSize );
+
+    private:
+        /** Surface provider
+
+            Deliberately not a refcounted reference, because of
+            potential circular references for canvas. Provides us with
+            our output surface and associated functionality.
+         */
+        SurfaceProvider*          mpSurfaceProvider;
+
+        VclPtr<OutputDevice>      mpRefDevice;
+        ::cairo::SurfaceSharedPtr mpSurface;
+    };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */