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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 "include/core/SkColor.h"
#include "include/core/SkColorPriv.h"
#include "include/private/SkColorData.h"
#include "include/private/base/SkTPin.h"
#include "src/base/SkVx.h"
#include "src/core/SkSwizzlePriv.h"
#include <algorithm>
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 = std::min(r, std::min(g, b));
unsigned max = std::max(r, std::max(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 = SkTPin(hsv[1], 0.0f, 1.0f);
SkScalar v = SkTPin(hsv[2], 0.0f, 1.0f);
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);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
template <>
SkColor4f SkColor4f::FromColor(SkColor bgra) {
SkColor4f rgba;
swizzle_rb(Sk4f_fromL32(bgra)).store(rgba.vec());
return rgba;
}
template <>
SkColor SkColor4f::toSkColor() const {
return Sk4f_toL32(swizzle_rb(skvx::float4::Load(this->vec())));
}
template <>
uint32_t SkColor4f::toBytes_RGBA() const {
return Sk4f_toL32(skvx::float4::Load(this->vec()));
}
template <>
SkColor4f SkColor4f::FromBytes_RGBA(uint32_t c) {
SkColor4f color;
Sk4f_fromL32(c).store(&color);
return color;
}
template <>
SkPMColor4f SkPMColor4f::FromPMColor(SkPMColor c) {
SkPMColor4f color;
swizzle_rb_if_bgra(Sk4f_fromL32(c)).store(&color);
return color;
}
template <>
uint32_t SkPMColor4f::toBytes_RGBA() const {
return Sk4f_toL32(skvx::float4::Load(this->vec()));
}
template <>
SkPMColor4f SkPMColor4f::FromBytes_RGBA(uint32_t c) {
SkPMColor4f color;
Sk4f_fromL32(c).store(&color);
return color;
}