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diff --git a/offapi/com/sun/star/presentation/XTransition.idl b/offapi/com/sun/star/presentation/XTransition.idl
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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 __com_sun_star_presentation_XTransition_idl__
+#define __com_sun_star_presentation_XTransition_idl__
+
+#include <com/sun/star/uno/XInterface.idl>
+
+module com {  module sun {  module star {
+
+module rendering { interface XBitmap; };
+
+module presentation {
+
+interface XSlideShowView;
+
+/** Transition interface to render custom transitions over time.<p>
+
+    @since OOo 2.4
+ */
+interface XTransition : ::com::sun::star::uno::XInterface
+{
+    /** Update transition on screen to given time state.<p>
+
+        @param t
+        Time on the transition timeline to display. Must be in the
+        [0,1] range.
+     */
+    void update( [in] double t );
+
+    void viewChanged( [in] XSlideShowView                        view,
+              [in] com::sun::star::rendering::XBitmap    leavingBitmap,
+              [in] com::sun::star::rendering::XBitmap    enteringBitmap );
+};
+
+}; }; }; };
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */