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diff --git a/slideshow/source/engine/activities/discreteactivitybase.hxx b/slideshow/source/engine/activities/discreteactivitybase.hxx
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef INCLUDED_SLIDESHOW_DISCRETEACTIVITYBASE_HXX
+#define INCLUDED_SLIDESHOW_DISCRETEACTIVITYBASE_HXX
+
+#include "activitybase.hxx"
+#include "wakeupevent.hxx"
+
+#include <vector>
+
+
+namespace slideshow
+{
+    namespace internal
+    {
+        /** Specialization of ActivityBase for discrete time activities.
+
+            A discrete time activity is one where time proceeds in
+            discrete steps, i.e. at given time instants.
+        */
+        class DiscreteActivityBase : public ActivityBase
+        {
+        public:
+            DiscreteActivityBase( const ActivityParameters& rParms );
+
+            /** Hook for derived classes.
+
+                This method is called for each discrete time
+                instant, with nFrame denoting the frame number
+                (starting with 0)
+
+                @param nFrame
+                Current frame number.
+
+                @param nRepeatCount
+                Number of full repeats already performed
+            */
+            virtual void perform( sal_uInt32 nFrame, sal_uInt32 nRepeatCount ) const = 0;
+            virtual void dispose();
+            virtual bool perform();
+
+        protected:
+            virtual void startAnimation();
+
+            sal_uInt32 calcFrameIndex( sal_uInt32       nCurrCalls,
+                                       ::std::size_t    nVectorSize ) const;
+
+            sal_uInt32 calcRepeatCount( sal_uInt32      nCurrCalls,
+                                        ::std::size_t   nVectorSize ) const;
+
+            ::std::size_t getNumberOfKeyTimes() const { return maDiscreteTimes.size(); }
+
+        private:
+            WakeupEventSharedPtr            mpWakeupEvent;
+            const ::std::vector< double >   maDiscreteTimes;
+            const double                    mnSimpleDuration;
+            sal_uInt32                      mnCurrPerformCalls;
+        };
+    }
+}
+
+#endif /* INCLUDED_SLIDESHOW_DISCRETEACTIVITYBASE_HXX */