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diff --git a/include/cppcanvas/canvas.hxx b/include/cppcanvas/canvas.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_CPPCANVAS_CANVAS_HXX
+#define INCLUDED_CPPCANVAS_CANVAS_HXX
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <memory>
+
+namespace basegfx
+{
+    class B2DHomMatrix;
+    class B2DPolyPolygon;
+}
+
+namespace com::sun::star::rendering
+{
+    class  XCanvas;
+    struct ViewState;
+}
+
+
+/* Definition of BitmapCanvas */
+
+namespace cppcanvas
+{
+    class PolyPolygon;
+    class Canvas;
+
+    // forward declaration, since tools::PolyPolygon also references Canvas
+    typedef std::shared_ptr< PolyPolygon > PolyPolygonSharedPtr;
+
+    // forward declaration, since cloneCanvas() also references Canvas
+    typedef std::shared_ptr< Canvas > CanvasSharedPtr;
+
+    /** Canvas interface
+     */
+    class Canvas
+    {
+    public:
+        /** Extra pixel used when canvas anti-aliases.
+
+            Enlarge the bounding box of drawing primitives by this
+            amount in both dimensions, and on both sides of the
+            bounds, to account for extra pixel touched outside the
+            actual primitive bounding box, when the canvas
+            performs anti-aliasing.
+         */
+        static constexpr auto ANTIALIASING_EXTRA_SIZE=2;
+
+        Canvas() = default;
+        Canvas(Canvas const &) = default;
+        Canvas(Canvas &&) = default;
+        Canvas & operator =(Canvas const &) = default;
+#if !(defined __GNUC__ && !defined __clang__ && __GNUC__ == 8) // bogus -Werror=virtual-move-assign
+        Canvas & operator =(Canvas &&) = default;
+#endif
+
+        virtual ~Canvas() {}
+
+        virtual void                             setTransformation( const ::basegfx::B2DHomMatrix& rMatrix ) = 0;
+        virtual ::basegfx::B2DHomMatrix          getTransformation() const = 0;
+
+        virtual void                             setClip( const ::basegfx::B2DPolyPolygon& rClipPoly ) = 0;
+        virtual void                             setClip() = 0;
+
+        /** Get current clip
+
+            @return NULL, if no clip is set, otherwise the current clip poly-polygon
+         */
+        virtual ::basegfx::B2DPolyPolygon const* getClip() const = 0;
+
+        virtual CanvasSharedPtr                  clone() const = 0;
+        virtual void                             clear() const = 0;
+
+        // this should be considered private. if RTTI gets enabled
+        // someday, remove that to a separate interface
+        virtual css::uno::Reference<
+            css::rendering::XCanvas >           getUNOCanvas() const = 0;
+        virtual css::rendering::ViewState       getViewState() const = 0;
+    };
+
+}
+
+#endif // INCLUDED_CPPCANVAS_CANVAS_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */