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diff --git a/slideshow/source/engine/transitions/clippingfunctor.hxx b/slideshow/source/engine/transitions/clippingfunctor.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_SLIDESHOW_SOURCE_ENGINE_TRANSITIONS_CLIPPINGFUNCTOR_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_TRANSITIONS_CLIPPINGFUNCTOR_HXX
+
+#include <basegfx/vector/b2dsize.hxx>
+#include <basegfx/matrix/b2dhommatrix.hxx>
+#include <transitioninfo.hxx>
+#include "parametricpolypolygon.hxx"
+
+
+namespace slideshow
+{
+    namespace internal
+    {
+        /** Generates the final clipping polygon.
+
+            This class serves as the functor, which generates the
+            final clipping polygon from a given ParametricPolyPolygon
+            and a TransitionInfo.
+
+            The ParametricPolyPolygon can be obtained from the
+            ParametricPolyPolygonFactory, see there.
+
+            The TransitionInfo further parametrizes the polygon
+            generated by the ParametricPolyPolygon, with common
+            modifications such as rotation, flipping, or change of
+            direction. This allows the ParametricPolyPolygonFactory to
+            provide only prototypical shapes, with the ClippingFunctor
+            further customizing the output.
+         */
+        class ClippingFunctor
+        {
+        public:
+            ClippingFunctor(
+                const ParametricPolyPolygonSharedPtr&   rPolygon,
+                const TransitionInfo&                   rTransitionInfo,
+                bool                                    bDirectionForward,
+                bool                                    bModeIn );
+
+            /** Generate clip polygon.
+
+                @param nValue
+                Value to generate the polygon for. Must be in the
+                range [0,1].
+
+                @param rTargetSize
+                Size the clip polygon should cover. This is typically
+                the size of the object the effect is applied on.
+             */
+            ::basegfx::B2DPolyPolygon operator()( double                    nValue,
+                                                  const ::basegfx::B2DSize& rTargetSize );
+
+        private:
+            ParametricPolyPolygonSharedPtr     mpParametricPoly;
+            ::basegfx::B2DHomMatrix            maStaticTransformation;
+            // AW: Not needed
+            // ::basegfx::B2DPolyPolygon          maBackgroundRect;
+            bool                               mbForwardParameterSweep;
+            bool                               mbSubtractPolygon;
+            const bool                         mbScaleIsotrophically;
+            bool                               mbFlip;
+        };
+
+    }
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_TRANSITIONS_CLIPPINGFUNCTOR_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */