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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColor.h"
#include "SkColorData.h"
#include "SkFixed.h"
SkPMColor SkPreMultiplyARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
return SkPremultiplyARGBInline(a, r, g, b);
}
SkPMColor SkPreMultiplyColor(SkColor c) {
return SkPremultiplyARGBInline(SkColorGetA(c), SkColorGetR(c),
SkColorGetG(c), SkColorGetB(c));
}
///////////////////////////////////////////////////////////////////////////////
static inline SkScalar ByteToScalar(U8CPU x) {
SkASSERT(x <= 255);
return SkIntToScalar(x) / 255;
}
static inline SkScalar ByteDivToScalar(int numer, U8CPU denom) {
// cast to keep the answer signed
return SkIntToScalar(numer) / (int)denom;
}
void SkRGBToHSV(U8CPU r, U8CPU g, U8CPU b, SkScalar hsv[3]) {
SkASSERT(hsv);
unsigned min = SkMin32(r, SkMin32(g, b));
unsigned max = SkMax32(r, SkMax32(g, b));
unsigned delta = max - min;
SkScalar v = ByteToScalar(max);
SkASSERT(v >= 0 && v <= SK_Scalar1);
if (0 == delta) { // we're a shade of gray
hsv[0] = 0;
hsv[1] = 0;
hsv[2] = v;
return;
}
SkScalar s = ByteDivToScalar(delta, max);
SkASSERT(s >= 0 && s <= SK_Scalar1);
SkScalar h;
if (r == max) {
h = ByteDivToScalar(g - b, delta);
} else if (g == max) {
h = SkIntToScalar(2) + ByteDivToScalar(b - r, delta);
} else { // b == max
h = SkIntToScalar(4) + ByteDivToScalar(r - g, delta);
}
h *= 60;
if (h < 0) {
h += SkIntToScalar(360);
}
SkASSERT(h >= 0 && h < SkIntToScalar(360));
hsv[0] = h;
hsv[1] = s;
hsv[2] = v;
}
SkColor SkHSVToColor(U8CPU a, const SkScalar hsv[3]) {
SkASSERT(hsv);
SkScalar s = SkScalarPin(hsv[1], 0, 1);
SkScalar v = SkScalarPin(hsv[2], 0, 1);
U8CPU v_byte = SkScalarRoundToInt(v * 255);
if (SkScalarNearlyZero(s)) { // shade of gray
return SkColorSetARGB(a, v_byte, v_byte, v_byte);
}
SkScalar hx = (hsv[0] < 0 || hsv[0] >= SkIntToScalar(360)) ? 0 : hsv[0]/60;
SkScalar w = SkScalarFloorToScalar(hx);
SkScalar f = hx - w;
unsigned p = SkScalarRoundToInt((SK_Scalar1 - s) * v * 255);
unsigned q = SkScalarRoundToInt((SK_Scalar1 - (s * f)) * v * 255);
unsigned t = SkScalarRoundToInt((SK_Scalar1 - (s * (SK_Scalar1 - f))) * v * 255);
unsigned r, g, b;
SkASSERT((unsigned)(w) < 6);
switch ((unsigned)(w)) {
case 0: r = v_byte; g = t; b = p; break;
case 1: r = q; g = v_byte; b = p; break;
case 2: r = p; g = v_byte; b = t; break;
case 3: r = p; g = q; b = v_byte; break;
case 4: r = t; g = p; b = v_byte; break;
default: r = v_byte; g = p; b = q; break;
}
return SkColorSetARGB(a, r, g, b);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#include "SkPM4fPriv.h"
#include "SkHalf.h"
SkPM4f SkPM4f::FromPMColor(SkPMColor c) {
return From4f(swizzle_rb_if_bgra(Sk4f_fromL32(c)));
}
SkColor4f SkPM4f::unpremul() const {
float alpha = fVec[A];
if (0 == alpha) {
return { 0, 0, 0, 0 };
} else {
float invAlpha = 1 / alpha;
return { fVec[R] * invAlpha, fVec[G] * invAlpha, fVec[B] * invAlpha, alpha };
}
}
void SkPM4f::toF16(uint16_t half[4]) const {
for (int i = 0; i < 4; ++i) {
half[i] = SkFloatToHalf(fVec[i]);
}
}
uint64_t SkPM4f::toF16() const {
uint64_t value;
this->toF16(reinterpret_cast<uint16_t*>(&value));
return value;
}
SkPM4f SkPM4f::FromF16(const uint16_t half[4]) {
return {{
SkHalfToFloat(half[0]),
SkHalfToFloat(half[1]),
SkHalfToFloat(half[2]),
SkHalfToFloat(half[3])
}};
}
#ifdef SK_DEBUG
void SkPM4f::assertIsUnit() const {
auto c4 = Sk4f::Load(fVec);
SkASSERT((c4 >= Sk4f(0)).allTrue() && (c4 <= Sk4f(1)).allTrue());
}
#endif
///////////////////////////////////////////////////////////////////////////////////////////////////
SkColor4f SkColor4f::FromColor(SkColor bgra) {
SkColor4f rgba;
swizzle_rb(Sk4f_fromS32(bgra)).store(rgba.vec());
return rgba;
}
SkColor SkColor4f::toSkColor() const {
return Sk4f_toS32(swizzle_rb(Sk4f::Load(this->vec())));
}
SkColor4f SkColor4f::Pin(float r, float g, float b, float a) {
SkColor4f c4;
Sk4f::Min(Sk4f::Max(Sk4f(r, g, b, a), Sk4f(0)), Sk4f(1)).store(c4.vec());
return c4;
}
SkPM4f SkColor4f::premul() const {
auto src = Sk4f::Load(this->pin().vec());
float srcAlpha = src[3]; // need the pinned version of our alpha
src = src * Sk4f(srcAlpha, srcAlpha, srcAlpha, 1);
return SkPM4f::From4f(src);
}
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