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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 "SkColorSpace_XYZ.h"
#include "SkColorSpacePriv.h"
#include "SkColorSpaceXform_Base.h"
#include "SkOpts.h"
SkColorSpace_XYZ::SkColorSpace_XYZ(SkGammaNamed gammaNamed, const SkMatrix44& toXYZD50)
: fProfileData(nullptr)
, fGammaNamed(gammaNamed)
, fGammas(nullptr)
, fToXYZD50(toXYZD50)
, fToXYZD50Hash(SkOpts::hash_fn(toXYZD50.values(), 16 * sizeof(SkMScalar), 0))
, fFromXYZD50(SkMatrix44::kUninitialized_Constructor)
{}
SkColorSpace_XYZ::SkColorSpace_XYZ(SkGammaNamed gammaNamed, sk_sp<SkGammas> gammas,
const SkMatrix44& toXYZD50, sk_sp<SkData> profileData)
: fProfileData(std::move(profileData))
, fGammaNamed(gammaNamed)
, fGammas(std::move(gammas))
, fToXYZD50(toXYZD50)
, fToXYZD50Hash(SkOpts::hash_fn(toXYZD50.values(), 16 * sizeof(SkMScalar), 0))
, fFromXYZD50(SkMatrix44::kUninitialized_Constructor) {
SkASSERT(!fGammas || 3 == fGammas->channels());
if (fGammas) {
for (int i = 0; i < fGammas->channels(); ++i) {
if (SkGammas::Type::kTable_Type == fGammas->type(i)) {
SkASSERT(fGammas->data(i).fTable.fSize >= 2);
}
}
}
}
const SkMatrix44* SkColorSpace_XYZ::onFromXYZD50() const {
fFromXYZOnce([this] {
if (!fToXYZD50.invert(&fFromXYZD50)) {
// If a client gives us a dst gamut with a transform that we can't invert, we will
// simply give them back a transform to sRGB gamut.
SkMatrix44 srgbToxyzD50(SkMatrix44::kUninitialized_Constructor);
srgbToxyzD50.set3x3RowMajorf(gSRGB_toXYZD50);
srgbToxyzD50.invert(&fFromXYZD50);
}
});
return &fFromXYZD50;
}
bool SkColorSpace_XYZ::onGammaCloseToSRGB() const {
return kSRGB_SkGammaNamed == fGammaNamed || k2Dot2Curve_SkGammaNamed == fGammaNamed;
}
bool SkColorSpace_XYZ::onGammaIsLinear() const {
return kLinear_SkGammaNamed == fGammaNamed;
}
bool SkColorSpace_XYZ::onIsNumericalTransferFn(SkColorSpaceTransferFn* coeffs) const {
if (named_to_parametric(coeffs, fGammaNamed)) {
return true;
}
SkASSERT(fGammas);
if (!fGammas->allChannelsSame()) {
return false;
}
if (fGammas->isValue(0)) {
value_to_parametric(coeffs, fGammas->data(0).fValue);
return true;
}
if (fGammas->isParametric(0)) {
*coeffs = fGammas->params(0);
return true;
}
return false;
}
sk_sp<SkColorSpace> SkColorSpace_XYZ::makeLinearGamma() const {
if (this->gammaIsLinear()) {
return sk_ref_sp(const_cast<SkColorSpace_XYZ*>(this));
}
return SkColorSpace::MakeRGB(kLinear_SkGammaNamed, fToXYZD50);
}
sk_sp<SkColorSpace> SkColorSpace_XYZ::makeSRGBGamma() const {
if (this->gammaCloseToSRGB()) {
return sk_ref_sp(const_cast<SkColorSpace_XYZ*>(this));
}
return SkColorSpace::MakeRGB(kSRGB_SkGammaNamed, fToXYZD50);
}
sk_sp<SkColorSpace> SkColorSpace_XYZ::makeColorSpin() const {
SkMatrix44 spin(SkMatrix44::kUninitialized_Constructor);
spin.set3x3(0, 1, 0, 0, 0, 1, 1, 0, 0);
spin.postConcat(fToXYZD50);
(void)spin.getType(); // Pre-cache spin matrix type to avoid races in future getType() calls.
return sk_sp<SkColorSpace>(new SkColorSpace_XYZ(fGammaNamed, fGammas, spin, fProfileData));
}
void SkColorSpace_XYZ::toDstGammaTables(const uint8_t* tables[3], sk_sp<SkData>* storage,
int numTables) const {
fToDstGammaOnce([this, numTables] {
const bool gammasAreMatching = numTables <= 1;
fDstStorage =
SkData::MakeUninitialized(numTables * SkColorSpaceXform_Base::kDstGammaTableSize);
SkColorSpaceXform_Base::BuildDstGammaTables(fToDstGammaTables,
(uint8_t*) fDstStorage->writable_data(), this,
gammasAreMatching);
});
*storage = fDstStorage;
tables[0] = fToDstGammaTables[0];
tables[1] = fToDstGammaTables[1];
tables[2] = fToDstGammaTables[2];
}
sk_sp<SkColorSpace> SkColorSpace_XYZ::makeNonlinearBlending() const {
if (this->nonlinearBlending()) {
return sk_ref_sp(const_cast<SkColorSpace_XYZ*>(this));
}
auto cs = sk_make_sp<SkColorSpace_XYZ>(fGammaNamed, fGammas, fToXYZD50, fProfileData);
cs->fNonlinearBlending = true;
return cs;
}
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