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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPM4f_DEFINED
#define SkPM4f_DEFINED
#include "SkColorPriv.h"
#include "SkNx.h"
static inline Sk4f swizzle_rb(const Sk4f& x) {
return SkNx_shuffle<2, 1, 0, 3>(x);
}
static inline Sk4f swizzle_rb_if_bgra(const Sk4f& x) {
#ifdef SK_PMCOLOR_IS_BGRA
return swizzle_rb(x);
#else
return x;
#endif
}
/*
* The float values are 0...1 premultiplied in RGBA order (regardless of SkPMColor order)
*/
struct SkPM4f {
enum {
R, G, B, A,
};
float fVec[4];
float r() const { return fVec[R]; }
float g() const { return fVec[G]; }
float b() const { return fVec[B]; }
float a() const { return fVec[A]; }
static SkPM4f FromPremulRGBA(float r, float g, float b, float a) {
SkPM4f p;
p.fVec[R] = r;
p.fVec[G] = g;
p.fVec[B] = b;
p.fVec[A] = a;
return p;
}
static SkPM4f From4f(const Sk4f& x) {
SkPM4f pm;
x.store(pm.fVec);
return pm;
}
static SkPM4f FromF16(const uint16_t[4]);
static SkPM4f FromPMColor(SkPMColor);
Sk4f to4f() const { return Sk4f::Load(fVec); }
Sk4f to4f_rgba() const { return this->to4f(); }
Sk4f to4f_bgra() const { return swizzle_rb(this->to4f()); }
Sk4f to4f_pmorder() const { return swizzle_rb_if_bgra(this->to4f()); }
SkPMColor toPMColor() const {
Sk4f value = swizzle_rb_if_bgra(this->to4f());
SkPMColor result;
SkNx_cast<uint8_t>(value * Sk4f(255) + Sk4f(0.5f)).store(&result);
return result;
}
void toF16(uint16_t[4]) const;
uint64_t toF16() const; // 4 float16 values packed into uint64_t
SkColor4f unpremul() const;
#ifdef SK_DEBUG
void assertIsUnit() const;
#else
void assertIsUnit() const {}
#endif
};
#endif
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