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diff --git a/slideshow/source/engine/transitions/transitiontools.hxx b/slideshow/source/engine/transitions/transitiontools.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_TRANSITIONTOOLS_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_TRANSITIONS_TRANSITIONTOOLS_HXX
+
+#include <basegfx/polygon/b2dpolygon.hxx>
+#include <basegfx/polygon/b2dpolypolygon.hxx>
+
+namespace slideshow::internal
+{
+/// Create a unit rect.
+::basegfx::B2DPolygon createUnitRect();
+
+/// Flips on X-axis:
+::basegfx::B2DPolyPolygon flipOnXAxis(::basegfx::B2DPolyPolygon const& polypoly);
+
+/// Flips on Y-axis:
+::basegfx::B2DPolyPolygon flipOnYAxis(::basegfx::B2DPolyPolygon const& polypoly);
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_TRANSITIONS_TRANSITIONTOOLS_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */