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diff --git a/slideshow/source/inc/hslcolor.hxx b/slideshow/source/inc/hslcolor.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_HSLCOLOR_HXX
+#define INCLUDED_SLIDESHOW_HSLCOLOR_HXX
+
+#include <cppcanvas/color.hxx>
+
+
+/* Definition of HSLColor class */
+
+namespace slideshow
+{
+    namespace internal
+    {
+        class RGBColor;
+
+        /** HSL color space class.
+         */
+        class HSLColor
+        {
+        public:
+            HSLColor();
+            explicit HSLColor( ::cppcanvas::Color::IntSRGBA nRGBColor );
+            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;
+
+            /** Saturation of the color.
+
+                @return saturation, is in the range [0,1]
+             */
+            double getSaturation() const;
+
+            /** Luminance of the color.
+
+                @return luminance, is in the range [0,1]
+             */
+            double getLuminance() const;
+
+            /** Get the RGB red value.
+             */
+            double getRed() const;
+
+            /** Get the RGB green value.
+             */
+            double getGreen() const;
+
+            /** Get the RGB blue value.
+             */
+            double getBlue() const;
+
+            /** Create an RGB color object.
+             */
+            RGBColor getRGBColor() const;
+
+            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;
+
+            /// Pre-calculated value, needed for conversion back to RGB
+            double      mnMagicValue;
+        };
+
+        HSLColor 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=true );
+    }
+}
+
+#endif /* INCLUDED_SLIDESHOW_HSLCOLOR_HXX */