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diff --git a/slideshow/source/engine/activities/accumulation.hxx b/slideshow/source/engine/activities/accumulation.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_ACTIVITIES_ACCUMULATION_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_ACCUMULATION_HXX
+
+#include <sal/types.h>
+#include <rtl/ustring.hxx>
+
+
+namespace slideshow::internal
+    {
+        /** Generic accumulation.
+
+            This template handles value accumulation across repeated
+            effect runs: returned is the end value times the repeat
+            count, plus the current value.
+
+            @param rEndValue
+            End value of the simple animation.
+
+            @param nRepeatCount
+            Number of completed repeats (i.e. 0 during the first
+            effect run)
+
+            @param rCurrValue
+            Current animation value
+         */
+        template< typename ValueType > ValueType accumulate( const ValueType&   rEndValue,
+                                                             sal_uInt32         nRepeatCount,
+                                                             const ValueType&   rCurrValue )
+        {
+            return nRepeatCount*rEndValue + rCurrValue;
+        }
+
+        /// Specialization for non-addable enums/constant values
+        template<> sal_Int16 accumulate< sal_Int16 >( const sal_Int16&,
+                                                      sal_uInt32,
+                                                      const sal_Int16&  rCurrValue )
+        {
+            // always return rCurrValue, it's forbidden to add enums/constant values...
+            return rCurrValue;
+        }
+
+        /// Specialization for non-addable strings
+        template<> OUString accumulate< OUString >( const OUString&,
+                                                                  sal_uInt32,
+                                                                  const OUString&    rCurrValue )
+        {
+            // always return rCurrValue, it's impossible to add strings...
+            return rCurrValue;
+        }
+
+        /// Specialization for non-addable bools
+        template<> bool accumulate< bool >( const bool&,
+                                            sal_uInt32,
+                                            const bool&     bCurrValue )
+        {
+            // always return bCurrValue, SMIL spec requires to ignore
+            // cumulative behaviour for bools.
+            return bCurrValue;
+        }
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_ACCUMULATION_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */