/*
 * STRUCT: SE_HLS_DATA
 *
 *   Used for Hue Lightness Saturation color model's data
 *
 *   hue -- angle in degrees about the vertical axis of the HLS double
 *          hexcone, with red placed at 0 for consistency with HSV. Valid
 *          range from 0.0 to 360.0, unless saturation is zero, in which case
 *          hue is undefined.
 *
 *   lightness -- from 0.0 to 1.0 (0 percent to 100 percent)
 *
 *   saturation -- from 0.0 to 1.0
 *
 *   HLS SUPPORT NOTE:  Support for the HLS (Hue Lightness Saturation)
 *     color model is provided as a convenience, but it is provided in
 *     separate functions, the SE_RGBtoHLS() and SE_HLStoRGB() functions.
 *     Thus, the SE_HLS_DATA structure is not included in the general
 *     SE_COLOR_DATA structure.
 */