class HT_Face_Pattern {
    public:
        enum Enum {
            Stipple00 = 0,
                       Stipple01, Stipple02, Stipple03, Stipple04, Stipple05, Stipple06, Stipple07, Stipple08, Stipple09,
            Stipple10, Stipple11, Stipple12, Stipple13, Stipple14, Stipple15, Stipple16, Stipple17, Stipple18, Stipple19,
            Stipple20, Stipple21, Stipple22, Stipple23, Stipple24, Stipple25, Stipple26, Stipple27, Stipple28, Stipple29,
            Stipple30, Stipple31, Stipple32, Stipple33, Stipple34, Stipple35, Stipple36, Stipple37, Stipple38, Stipple39,
            Stipple40, Stipple41, Stipple42, Stipple43, Stipple44, Stipple45, Stipple46, Stipple47, Stipple48, Stipple49,
            Stipple50, Stipple51, Stipple52, Stipple53, Stipple54, Stipple55, Stipple56, Stipple57, Stipple58, Stipple59,
            Stipple60, Stipple61, Stipple62, Stipple63, Stipple64,
            Solid = Stipple64,
 
            Checkerboard,
            Crosshatch,
            Diamonds,
            Horizontal_Bars,
            Slant_Left,
            Slant_Right,
            Square_Dots,
            Vertical_Bars,
 
            User_Defined,
 
            Count,
            Undefined = -1
        };
    ENUM_CLASS_FUNCTIONS (HT_Face_Pattern)
};

For a further description, see the section, "Face Patterns" in chapter 2, "Heidi Architecture."