namespace lyx {
+/**
+ * \class Color
+ *
+ * A class holding a definition of a certain color.
+ *
+ * A color can be one of the following kinds:
+ *
+ * - a single color, then mergeColor = Color_ignore
+ * - a merged color, i.e. the average of the base and merge colors.
+ */
+
+class Color
+{
+public:
+ ///
+ Color(ColorCode base_color = Color_none);
+
+ /// comparison operators.
+ //@{
+ bool operator==(Color const & color) const;
+ bool operator!=(Color const & color) const;
+ bool operator<(Color const & color) const;
+ bool operator<=(Color const & color) const;
+ //@}
+
+ /// the base color
+ ColorCode baseColor;
+ /// The color that is merged with the base color. Set
+ /// mergeColor to Color_ignore if no merging is wanted.
+ ColorCode mergeColor;
+};
+
+std::ostream & operator<<(std::ostream & os, Color color);
+
+
/**
* \class ColorSet
*