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diff --git a/slideshow/source/engine/shapes/intrinsicanimationactivity.hxx b/slideshow/source/engine/shapes/intrinsicanimationactivity.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_SHAPES_INTRINSICANIMATIONACTIVITY_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_SHAPES_INTRINSICANIMATIONACTIVITY_HXX
+
+#include <wakeupevent.hxx>
+#include <activity.hxx>
+#include <slideshowcontext.hxx>
+#include "drawshape.hxx"
+
+/* Definition of IntrinsicAnimationActivity class */
+
+namespace slideshow::internal
+    {
+        /** Create an IntrinsicAnimationActivity.
+
+            This is an Activity interface implementation for intrinsic
+            shape animations. Intrinsic shape animations are
+            animations directly within a shape, e.g. drawing layer
+            animations, or GIF animations.
+
+            @param rContext
+            Common slideshow objects
+
+            @param rDrawShape
+            Shape to control the intrinsic animation for
+
+            @param rWakeupEvent
+            Externally generated wakeup event, to set this
+            activity to sleep during inter-frame intervals. Must
+            come from the outside, since wakeup event and this
+            object have mutual references to each other.
+
+            @param rTimeouts
+            Vector of timeout values, to wait before the next
+            frame is shown.
+        */
+        ActivitySharedPtr createIntrinsicAnimationActivity(
+            const SlideShowContext&         rContext,
+            const DrawShapeSharedPtr&       rDrawShape,
+            const WakeupEventSharedPtr&     rWakeupEvent,
+            ::std::vector<double>&&         rTimeouts,
+            sal_uInt32                      nNumLoops);
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_SHAPES_INTRINSICANIMATIONACTIVITY_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */