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diff --git a/slideshow/source/inc/transitioninfo.hxx b/slideshow/source/inc/transitioninfo.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_INC_TRANSITIONINFO_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_TRANSITIONINFO_HXX
+
+#include <sal/types.h>
+
+
+namespace slideshow::internal {
+
+struct TransitionInfo
+{
+    // the following two member serve as the search key
+    // for an incoming XTransitionFilter node
+
+    // {
+
+    sal_Int16       mnTransitionType;
+    sal_Int16       mnTransitionSubType;
+
+    // }
+
+
+    /** This enum classifies a transition type
+     */
+    enum TransitionClass
+    {
+        /// Invalid type
+        TRANSITION_INVALID,
+
+        /// Transition expressed by parametric clip polygon
+        TRANSITION_CLIP_POLYPOLYGON,
+
+        /// Transition expressed by hand-crafted function
+        TRANSITION_SPECIAL
+    };
+
+    /// class of effect handling
+    TransitionClass meTransitionClass;
+
+    /// Rotation angle of clip polygon
+    double          mnRotationAngle;
+
+    /// X scaling of clip polygon (negative values mirror)
+    double          mnScaleX;
+
+    /// Y scaling of clip polygon (negative values mirror)
+    double          mnScaleY;
+
+    /** This enum determines the method how to reverse
+        a parametric clip polygon transition.
+
+        A reversed transition runs in the geometrically
+        opposite direction. For a left-to-right bar wipe, the
+        reversed transition is a right-to-left wipe, whereas
+        for an iris transition, the reversed mode will show
+        the target in the outer area (instead of in the inner
+        area, as in normal mode).
+    */
+    enum class ReverseMethod
+    {
+        /** Ignore direction attribute altogether
+            (if it has no sensible meaning for this transition)
+        */
+        Ignore,
+
+        /** Combination of ReverseMethod::InvertSweep and
+            ReverseMethod::SubtractPolygon.
+        */
+        SubtractAndInvert,
+
+        /// Reverse by rotating polygon 180 degrees
+        Rotate180,
+
+        /// Reverse by flipping polygon at the y (!) axis
+        FlipX,
+
+        /// Reverse by flipping polygon at the x (!) axis
+        FlipY
+    };
+
+    /** Indicating the method to use when transition
+        should be 'reversed'.
+
+        @see ReverseMethod
+    */
+    ReverseMethod   meReverseMethod;
+
+    /** When true, transition 'out' effects are realized
+        by inverting the parameter sweep direction (1->0
+        instead of 0->1). Otherwise, 'out' effects are
+        realized by changing inside and outside areas of
+        the parametric poly-polygon.
+    */
+    bool            mbOutInvertsSweep;
+
+    /** when true, scale clip polygon isotropically to
+        target size.  when false, scale is
+        anisotropically.
+    */
+    bool            mbScaleIsotrophically;
+
+
+    /// Compare against type and subtype
+    class Comparator
+    {
+        sal_Int16 mnTransitionType;
+        sal_Int16 mnTransitionSubType;
+    public:
+        Comparator( sal_Int16 nTransitionType,
+                    sal_Int16 nTransitionSubType )
+            : mnTransitionType( nTransitionType ),
+              mnTransitionSubType( nTransitionSubType ) {}
+        bool operator()( const TransitionInfo& rEntry ) const {
+            return rEntry.mnTransitionType == mnTransitionType &&
+                rEntry.mnTransitionSubType == mnTransitionSubType;
+        }
+    };
+};
+
+} // namespace presentation::internal
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_TRANSITIONINFO_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */