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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 SkPM4fPriv_DEFINED
#define SkPM4fPriv_DEFINED
#include "SkColorPriv.h"
#include "SkPM4f.h"
#include "SkSRGB.h"
static inline Sk4f set_alpha(const Sk4f& px, float alpha) {
return { px[0], px[1], px[2], alpha };
}
static inline float get_alpha(const Sk4f& px) {
return px[3];
}
static inline Sk4f Sk4f_fromL32(uint32_t px) {
return SkNx_cast<float>(Sk4b::Load(&px)) * (1/255.0f);
}
static inline Sk4f Sk4f_fromS32(uint32_t px) {
return { sk_linear_from_srgb[(px >> 0) & 0xff],
sk_linear_from_srgb[(px >> 8) & 0xff],
sk_linear_from_srgb[(px >> 16) & 0xff],
(1/255.0f) * (px >> 24) };
}
static inline uint32_t Sk4f_toL32(const Sk4f& px) {
uint32_t l32;
SkNx_cast<uint8_t>(Sk4f_round(px * 255.0f)).store(&l32);
return l32;
}
static inline uint32_t Sk4f_toS32(const Sk4f& px) {
Sk4i rgb = sk_linear_to_srgb(px),
srgb = { rgb[0], rgb[1], rgb[2], (int)(255.0f * px[3] + 0.5f) };
uint32_t s32;
SkNx_cast<uint8_t>(srgb).store(&s32);
return s32;
}
// SkColor handling:
// SkColor has an ordering of (b, g, r, a) if cast to an Sk4f, so the code swizzles r and b to
// produce the needed (r, g, b, a) ordering.
static inline Sk4f Sk4f_from_SkColor(SkColor color) {
return swizzle_rb(Sk4f_fromS32(color));
}
static inline void assert_unit(float x) {
SkASSERT(0 <= x && x <= 1);
}
static inline float exact_srgb_to_linear(float srgb) {
assert_unit(srgb);
float linear;
if (srgb <= 0.04045) {
linear = srgb / 12.92f;
} else {
linear = powf((srgb + 0.055f) / 1.055f, 2.4f);
}
assert_unit(linear);
return linear;
}
#endif
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