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diff --git a/slideshow/source/engine/transitions/snakewipe.hxx b/slideshow/source/engine/transitions/snakewipe.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_SNAKEWIPE_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_TRANSITIONS_SNAKEWIPE_HXX
+
+#include "parametricpolypolygon.hxx"
+
+
+namespace slideshow::internal {
+
+/// Generates a snake wipe:
+class SnakeWipe : public ParametricPolyPolygon
+{
+public:
+    SnakeWipe( sal_Int32 nElements, bool diagonal, bool flipOnYAxis );
+    virtual ::basegfx::B2DPolyPolygon operator () ( double t ) override;
+
+protected:
+    // topLeftHorizontal:
+    ::basegfx::B2DPolyPolygon calcSnake( double t ) const;
+    // topLeftDiagonal:
+    ::basegfx::B2DPolyPolygon calcHalfDiagonalSnake( double t, bool in ) const;
+
+    const sal_Int32 m_sqrtElements;
+    const double m_elementEdge;
+    const bool m_diagonal;
+    const bool m_flipOnYAxis;
+};
+
+/// Generates a parallel snakes wipe:
+class ParallelSnakesWipe : public SnakeWipe
+{
+public:
+    ParallelSnakesWipe( sal_Int32 nElements,
+                        bool diagonal, bool flipOnYAxis, bool opposite )
+        : SnakeWipe( nElements, diagonal, flipOnYAxis ),
+          m_opposite( opposite )
+        {}
+    virtual ::basegfx::B2DPolyPolygon operator () ( double t ) override;
+private:
+    const bool m_opposite;
+};
+
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_TRANSITIONS_SNAKEWIPE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */