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diff --git a/slideshow/source/inc/rgbcolor.hxx b/slideshow/source/inc/rgbcolor.hxx
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+++ b/slideshow/source/inc/rgbcolor.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_RGBCOLOR_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_RGBCOLOR_HXX
+
+#include <cppcanvas/color.hxx>
+
+
+/* Definition of RGBColor class */
+
+namespace slideshow::internal
+    {
+        class HSLColor;
+
+        /** RGB color space class.
+         */
+        class RGBColor
+        {
+        public:
+            RGBColor();
+            explicit RGBColor( ::cppcanvas::IntSRGBA nRGBColor );
+            RGBColor( double nRed, double nGreen, double nBlue );
+            explicit RGBColor( const HSLColor& rColor );
+
+            /** Get the RGB red value.
+             */
+            double getRed() const {  return maRGBTriple.mnRed; }
+
+            /** Get the RGB green value.
+             */
+            double getGreen() const {  return maRGBTriple.mnGreen; }
+
+            /** Get the RGB blue value.
+             */
+            double getBlue() const {  return maRGBTriple.mnBlue; }
+
+            /** Create an integer sRGBA color.
+             */
+            ::cppcanvas::IntSRGBA getIntegerColor() const;
+
+            struct RGBTriple
+            {
+                RGBTriple();
+                RGBTriple( double nRed, double nGreen, double nBlue );
+
+                double mnRed;
+                double mnGreen;
+                double mnBlue;
+            };
+
+        private:
+            // default copy/assignment are okay
+            // RGBColor(const RGBColor&);
+            // RGBColor& operator=( const RGBColor& );
+
+            RGBTriple   maRGBTriple;
+        };
+
+        bool operator==( const RGBColor& rLHS, const RGBColor& rRHS );
+        bool operator!=( const RGBColor& rLHS, const RGBColor& rRHS );
+        RGBColor operator+( const RGBColor& rLHS, const RGBColor& rRHS );
+        RGBColor operator*( const RGBColor& rLHS, const RGBColor& rRHS );
+        RGBColor operator*( double nFactor, const RGBColor& rRHS );
+
+
+        /** RGB color linear interpolator.
+
+            @param t
+            As usual, t must be in the [0,1] range
+        */
+        RGBColor interpolate( const RGBColor& rFrom, const RGBColor& rTo, double t );
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_RGBCOLOR_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */