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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "skia/ext/skcolorspace_primaries.h"
#include <iomanip>
#include <sstream>
#include "third_party/skia/include/core/SkColorSpace.h"
bool operator==(const SkColorSpacePrimaries& a,
const SkColorSpacePrimaries& b) {
return a.fRX == b.fRX && a.fRY == b.fRY && a.fGX == b.fGX && a.fGY == b.fGY &&
a.fBX == b.fBX && a.fBY == b.fBY && a.fWX == b.fWX && a.fWY == b.fWY;
}
bool operator!=(const SkColorSpacePrimaries& a,
const SkColorSpacePrimaries& b) {
return !(a == b);
}
namespace skia {
std::string SkColorSpacePrimariesToString(
const SkColorSpacePrimaries& primaries) {
if (primaries == SkNamedPrimariesExt::kInvalid) {
return "invalid";
}
std::stringstream ss;
ss << std::fixed << std::setprecision(4);
ss << "{";
if (primaries == SkNamedPrimariesExt::kSRGB) {
ss << "name:'srgb', ";
} else if (primaries == SkNamedPrimariesExt::kP3) {
ss << "name:'p3', ";
} else if (primaries == SkNamedPrimaries::kRec2020) {
ss << "name:'rec2020', ";
}
ss << "r:[" << primaries.fRX << ", " << primaries.fRY << "], ";
ss << "g:[" << primaries.fGX << ", " << primaries.fGY << "], ";
ss << "b:[" << primaries.fBX << ", " << primaries.fBY << "], ";
ss << "w:[" << primaries.fWX << ", " << primaries.fWY << "]";
ss << "}";
return ss.str();
}
SkColorSpacePrimaries GetD65PrimariesFromToXYZD50Matrix(
const skcms_Matrix3x3& m_d50) {
constexpr float kD65_X = 0.3127f;
constexpr float kD65_Y = 0.3290f;
skcms_Matrix3x3 adapt_d65_to_d50;
skcms_AdaptToXYZD50(kD65_X, kD65_Y, &adapt_d65_to_d50);
skcms_Matrix3x3 adapt_d50_to_d65;
skcms_Matrix3x3_invert(&adapt_d65_to_d50, &adapt_d50_to_d65);
const skcms_Matrix3x3 m = skcms_Matrix3x3_concat(&adapt_d50_to_d65, &m_d50);
const float sum_R = m.vals[0][0] + m.vals[1][0] + m.vals[2][0];
const float sum_G = m.vals[0][1] + m.vals[1][1] + m.vals[2][1];
const float sum_B = m.vals[0][2] + m.vals[1][2] + m.vals[2][2];
SkColorSpacePrimaries primaries;
primaries.fRX = m.vals[0][0] / sum_R;
primaries.fRY = m.vals[1][0] / sum_R;
primaries.fGX = m.vals[0][1] / sum_G;
primaries.fGY = m.vals[1][1] / sum_G;
primaries.fBX = m.vals[0][2] / sum_B;
primaries.fBY = m.vals[1][2] / sum_B;
primaries.fWX = kD65_X;
primaries.fWY = kD65_Y;
return primaries;
}
} // namespace skia
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