HWB_to_RGB (HWBType HWB, RGBType * RGB)
{

	/*
	 * H is given on [0, 6] or UNDEFINED. W and B are given on [0, 1].
	 * RGB are each returned on [0, 1].
	 */

	float h = HWB.H, w = HWB.W, b = HWB.B, v, n, f;
	int i;

	v = 1 - b;
	if (h == HWB_UNDEFINED)
		RETURN_RGB (v, v, v);
	i = floor (h);
	f = h - i;
	if (i & 1)
		f = 1 - f;			/* if i is odd */
	n = w + f * (v - w);		/* linear interpolation between w and v */
	switch (i) {
	case 6:
	case 0:
		RETURN_RGB (v, n, w);
	case 1:
		RETURN_RGB (n, v, w);
	case 2:
		RETURN_RGB (w, v, n);
	case 3:
		RETURN_RGB (w, n, v);
	case 4:
		RETURN_RGB (n, w, v);
	case 5:
		RETURN_RGB (v, w, n);
	}

	return RGB;

}
Unknown