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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 "SkColorSpaceXformSteps.h"
#include "SkArenaAlloc.h"
#include "SkPM4f.h"
#include "SkRasterPipeline.h"
#include "SkSRGB.h"
#include "../jumper/SkJumper.h"
// This file is mostly helper routines for doing color space management.
// It probably wants a new name, and they likely don't need to be inline.
//
// There are two generations of routines in here, the old ones that assumed linear blending,
// and the new ones assuming as-encoded blending. We're trying to move to the new as-encoded
// ones and will hopefully eventually remove all the linear routines.
//
// We'll start with the new as-encoded routines first,
// and shove all the old broken routines towards the bottom.
static inline Sk4f Sk4f_fromL32(uint32_t px) {
return SkNx_cast<float>(Sk4b::Load(&px)) * (1/255.0f);
}
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 SkPM4f premul_in_dst_colorspace(SkColor4f color4f,
SkColorSpace* srcCS, SkColorSpace* dstCS) {
// We treat untagged sources as sRGB.
if (!srcCS) { srcCS = SkColorSpace::MakeSRGB().get(); }
// If dstCS is null, no color space transformation is needed (and apply() will just premul).
if (!dstCS) { dstCS = srcCS; }
// TODO: In the very common case of srcCS being sRGB,
// can we precompute an sRGB -> dstCS SkColorSpaceXformSteps for each device and use it here?
SkColorSpaceXformSteps(srcCS, kUnpremul_SkAlphaType, dstCS)
.apply(color4f.vec());
return {{color4f.fR, color4f.fG, color4f.fB, color4f.fA}};
}
static inline SkPM4f premul_in_dst_colorspace(SkColor color, SkColorSpace* dstCS) {
// SkColors are always sRGB.
return premul_in_dst_colorspace(SkColor4f::FromColor(color),
SkColorSpace::MakeSRGB().get(), dstCS);
}
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
// Functions below this line are probably totally broken as far as color space management goes.
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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);
}
#endif
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