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diff --git a/slideshow/source/inc/hslcolor.hxx b/slideshow/source/inc/hslcolor.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_HSLCOLOR_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_HSLCOLOR_HXX
+
+
+/* Definition of HSLColor class */
+
+namespace slideshow
+{
+    namespace internal
+    {
+        class RGBColor;
+
+        /** HSL color space class.
+         */
+        class HSLColor
+        {
+        public:
+            HSLColor();
+            HSLColor( double nHue, double nSaturation, double nLuminance );
+            explicit HSLColor( const RGBColor& rColor );
+
+            /** Hue of the color.
+
+                @return hue, is in the range [0,360]
+             */
+            double getHue() const {  return maHSLTriple.mnHue; }
+
+            /** Saturation of the color.
+
+                @return saturation, is in the range [0,1]
+             */
+            double getSaturation() const {  return maHSLTriple.mnSaturation; }
+
+            /** Luminance of the color.
+
+                @return luminance, is in the range [0,1]
+             */
+            double getLuminance() const {  return maHSLTriple.mnLuminance; }
+
+            struct HSLTriple
+            {
+                HSLTriple();
+                HSLTriple( double nHue, double nSaturation, double nLuminance );
+
+                double mnHue;
+                double mnSaturation;
+                double mnLuminance;
+            };
+
+        private:
+            // default copy/assignment are okay
+            // HSLColor(const HSLColor&);
+            // HSLColor& operator=( const HSLColor& );
+
+            HSLTriple   maHSLTriple;
+
+        };
+
+        bool operator==( const HSLColor& rLHS, const HSLColor& rRHS );
+        bool operator!=( const HSLColor& rLHS, const HSLColor& rRHS );
+        HSLColor operator+( const HSLColor& rLHS, const HSLColor& rRHS );
+        HSLColor operator*( double nFactor, const HSLColor& rRHS );
+
+        /** HSL color linear interpolator.
+
+            @param t
+            As usual, t must be in the [0,1] range
+
+            @param bCCW
+            When true, hue interpolation happens counter-clockwise
+        */
+        HSLColor interpolate( const HSLColor& rFrom, const HSLColor& rTo, double t, bool bCCW );
+    }
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_HSLCOLOR_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */