SkColor SkHSVToColor(U8CPU a, const SkScalar hsv[3]) {
SkASSERT(hsv);
U8CPU s = UnitScalarToByte(hsv[1]);
U8CPU v = UnitScalarToByte(hsv[2]);
if (0 == s) { // shade of gray
return SkColorSetARGB(a, v, v, v);
}
SkFixed hx = (hsv[0] < 0 || hsv[0] >= SkIntToScalar(360)) ? 0 : SkScalarToFixed(hsv[0]/60);
SkFixed f = hx & 0xFFFF;
unsigned v_scale = SkAlpha255To256(v);
unsigned p = SkAlphaMul(255 - s, v_scale);
unsigned q = SkAlphaMul(255 - (s * f >> 16), v_scale);
unsigned t = SkAlphaMul(255 - (s * (SK_Fixed1 - f) >> 16), v_scale);
unsigned r, g, b;
SkASSERT((unsigned)(hx >> 16) < 6);
switch (hx >> 16) {
case 0: r = v; g = t; b = p; break;
case 1: r = q; g = v; b = p; break;
case 2: r = p; g = v; b = t; break;
case 3: r = p; g = q; b = v; break;
case 4: r = t; g = p; b = v; break;
default: r = v; g = p; b = q; break;
}
return SkColorSetARGB(a, r, g, b);
}
ccColor3B CCUtils::hsv2ccc3(ccColorHSV c) {
unsigned char s = UnitScalarToByte(c.s);
unsigned char v = UnitScalarToByte(c.v);
// if s is zero then rgb color is gray
if (0 == s) {
return ccc3(v, v, v);
}
int hx = (c.h < 0 || c.h >= 360.f) ? 0 : (int)((c.h / 60) * (1 << 16));
int f = hx & 0xFFFF;
unsigned char v_scale = v + 1;
unsigned char p = ((255 - s) * v_scale) >> 8;
unsigned char q = ((255 - (s * f >> 16)) * v_scale) >> 8;
unsigned char t = ((255 - (s * ((1 << 16) - f) >> 16)) * v_scale) >> 8;
unsigned char r, g, b;
switch (hx >> 16) {
case 0:
r = v;
g = t;
b = p;
break;
case 1:
r = q;
g = v;
b = p;
break;
case 2:
r = p;
g = v;
b = t;
break;
case 3:
r = p;
g = q;
b = v;
break;
case 4:
r = t;
g = p;
b = v;
break;
default:
r = v;
g = p;
b = q;
break;
}
return ccc3(r, g, b);
}
