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diff --git a/cppcanvas/source/wrapper/implcanvas.hxx b/cppcanvas/source/wrapper/implcanvas.hxx
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+++ b/cppcanvas/source/wrapper/implcanvas.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/uno/Reference.hxx>
+#include <com/sun/star/rendering/ViewState.hpp>
+#include <cppcanvas/canvas.hxx>
+
+#include <optional>
+#include <basegfx/polygon/b2dpolypolygon.hxx>
+
+
+namespace basegfx
+{
+    class B2DHomMatrix;
+    class B2DPolyPolygon;
+}
+
+namespace com::sun::star::rendering
+{
+    class  XCanvas;
+}
+
+
+/* Definition of ImplCanvas */
+
+namespace cppcanvas::internal
+{
+
+        class ImplCanvas : public virtual Canvas
+        {
+        public:
+            explicit ImplCanvas( css::uno::Reference< css::rendering::XCanvas > xCanvas );
+            virtual ~ImplCanvas() override;
+
+            ImplCanvas(ImplCanvas const &) = default;
+            ImplCanvas(ImplCanvas &&) = default;
+            ImplCanvas & operator =(ImplCanvas const &) = delete; // due to const mxCanvas
+            ImplCanvas & operator =(ImplCanvas &&) = delete; // due to const mxCanvas
+
+            virtual void                             setTransformation( const ::basegfx::B2DHomMatrix& rMatrix ) override;
+            virtual ::basegfx::B2DHomMatrix          getTransformation() const override;
+
+            virtual void                             setClip( const ::basegfx::B2DPolyPolygon& rClipPoly ) override;
+            virtual void                             setClip() override;
+            virtual ::basegfx::B2DPolyPolygon const* getClip() const override;
+
+            virtual CanvasSharedPtr                  clone() const override;
+
+            virtual void                             clear() const override;
+
+            virtual css::uno::Reference<
+                css::rendering::XCanvas >            getUNOCanvas() const override;
+
+            virtual css::rendering::ViewState        getViewState() const override;
+
+        private:
+            mutable css::rendering::ViewState                    maViewState;
+            std::optional<basegfx::B2DPolyPolygon>             maClipPolyPolygon;
+            const css::uno::Reference< css::rendering::XCanvas > mxCanvas;
+        };
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */