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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: */