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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 "SkColorData.h"
#include "SkColorSpace.h"
#include "SkArenaAlloc.h"
#include "SkPM4f.h"
#include "SkRasterPipeline.h"
#include "SkSRGB.h"
#include "../jumper/SkJumper.h"
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;
}
static inline void append_gamut_transform(SkRasterPipeline* p,
SkArenaAlloc* alloc,
SkColorSpace* src,
SkColorSpace* dst,
SkAlphaType srcAT) {
if (src == dst || !dst || !src) {
return;
}
const SkMatrix44 *fromSrc = src-> toXYZD50(),
*toDst = dst->fromXYZD50();
if (!fromSrc || !toDst) {
SkDEBUGFAIL("We can't handle non-XYZ color spaces in append_gamut_transform().");
return;
}
// Slightly more sophisticated version of if (src == dst)
if (src->toXYZD50Hash() == dst->toXYZD50Hash()) {
return;
}
// Convert from 4x4 to (column-major) 3x4.
SkMatrix44 m44(*toDst, *fromSrc);
float* ptr = alloc->makeArrayDefault<float>(12);
*ptr++ = m44.get(0,0); *ptr++ = m44.get(1,0); *ptr++ = m44.get(2,0);
*ptr++ = m44.get(0,1); *ptr++ = m44.get(1,1); *ptr++ = m44.get(2,1);
*ptr++ = m44.get(0,2); *ptr++ = m44.get(1,2); *ptr++ = m44.get(2,2);
*ptr++ = m44.get(0,3); *ptr++ = m44.get(1,3); *ptr++ = m44.get(2,3);
p->append(SkRasterPipeline::matrix_3x4, ptr-12);
}
static inline SkColor4f to_colorspace(const SkColor4f& c, SkColorSpace* src, SkColorSpace* dst) {
SkColor4f color4f = c;
if (src && dst && !SkColorSpace::Equals(src, dst)) {
SkJumper_MemoryCtx color4f_ptr = { &color4f, 0 };
SkSTArenaAlloc<256> alloc;
SkRasterPipeline p(&alloc);
p.append_constant_color(&alloc, color4f);
append_gamut_transform(&p, &alloc, src, dst, kUnpremul_SkAlphaType);
p.append(SkRasterPipeline::store_f32, &color4f_ptr);
p.run(0,0,1,1);
}
return color4f;
}
static inline SkColor4f SkColor4f_from_SkColor(SkColor color, SkColorSpace* dst) {
SkColor4f color4f;
if (dst) {
// sRGB gamma, sRGB gamut.
color4f = to_colorspace(SkColor4f::FromColor(color),
SkColorSpace::MakeSRGB().get(), dst);
} else {
// Linear gamma, dst gamut.
swizzle_rb(SkNx_cast<float>(Sk4b::Load(&color)) * (1/255.0f)).store(&color4f);
}
return color4f;
}
static inline SkPM4f SkPM4f_from_SkColor(SkColor color, SkColorSpace* dst) {
return SkColor4f_from_SkColor(color, dst).premul();
}
#endif
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