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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.
*/
#include "SkPM4f.h"
#include "SkColorPriv.h"
#include "SkNx.h"
static inline float get_alpha(const Sk4f& f4) {
return f4.kth<SkPM4f::A>();
}
static inline Sk4f set_alpha(const Sk4f& f4, float alpha) {
static_assert(3 == SkPM4f::A, "");
return Sk4f(f4.kth<0>(), f4.kth<1>(), f4.kth<2>(), alpha);
}
static inline uint32_t to_4b(const Sk4f& f4) {
uint32_t b4;
SkNx_cast<uint8_t>(f4).store((uint8_t*)&b4);
return b4;
}
static inline Sk4f to_4f(uint32_t b4) {
return SkNx_cast<float>(Sk4b::Load((const uint8_t*)&b4));
}
static inline Sk4f srgb_to_linear(const Sk4f& s4) {
return set_alpha(s4 * s4, get_alpha(s4));
}
static inline Sk4f linear_to_srgb(const Sk4f& l4) {
return set_alpha(l4.sqrt(), get_alpha(l4));
}
///////////////////////////////////////////////////////////////////////////////////////////////////
static inline Sk4f Sk4f_fromL32(uint32_t src) {
return to_4f(src) * Sk4f(1.0f/255);
}
static inline Sk4f Sk4f_fromS32(uint32_t src) {
return srgb_to_linear(to_4f(src) * Sk4f(1.0f/255));
}
static inline uint32_t Sk4f_toL32(const Sk4f& x4) {
return to_4b(x4 * Sk4f(255) + Sk4f(0.5f));
}
static inline uint32_t Sk4f_toS32(const Sk4f& x4) {
return to_4b(linear_to_srgb(x4) * Sk4f(255) + Sk4f(0.5f));
}
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