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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/354829279): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "ui/gfx/color_space.h"
#include <algorithm>
#include <array>
#include <cmath>
#include <tuple>
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/skia_color_space_util.h"
namespace gfx {
namespace {
// Returns the L-infty difference of u and v.
float Diff(const SkV4& u, const SkV4& v) {
return std::max({std::abs(u.x - v.x), std::abs(u.y - v.y),
std::abs(u.z - v.z), std::abs(u.w - v.w)});
}
TEST(ColorSpace, RGBToYUV) {
const float kEpsilon = 1.0e-3f;
const size_t kNumTestRGBs = 3;
std::array<SkV4, kNumTestRGBs> test_rgbs = {{
{1.f, 0.f, 0.f, 1.f},
{0.f, 1.f, 0.f, 1.f},
{0.f, 0.f, 1.f, 1.f},
}};
const size_t kNumColorSpaces = 4;
std::array<gfx::ColorSpace, kNumColorSpaces> color_spaces = {
gfx::ColorSpace::CreateREC601(),
gfx::ColorSpace::CreateREC709(),
gfx::ColorSpace::CreateJpeg(),
gfx::ColorSpace::CreateXYZD50(),
};
SkV4 expected_yuvs[kNumColorSpaces][kNumTestRGBs] = {
// REC601
{
{0.3195f, 0.3518f, 0.9392f, 1.0000f},
{0.5669f, 0.2090f, 0.1322f, 1.0000f},
{0.1607f, 0.9392f, 0.4286f, 1.0000f},
},
// REC709
{
{0.2453f, 0.3994f, 0.9392f, 1.0000f},
{0.6770f, 0.1614f, 0.1011f, 1.0000f},
{0.1248f, 0.9392f, 0.4597f, 1.0000f},
},
// Jpeg
{
{0.2990f, 0.3313f, 1.0000f, 1.0000f},
{0.5870f, 0.1687f, 0.0813f, 1.0000f},
{0.1140f, 1.0000f, 0.4187f, 1.0000f},
},
// XYZD50
{
{1.0000f, 0.0000f, 0.0000f, 1.0000f},
{0.0000f, 1.0000f, 0.0000f, 1.0000f},
{0.0000f, 0.0000f, 1.0000f, 1.0000f},
},
};
for (size_t i = 0; i < kNumColorSpaces; ++i) {
SkM44 transfer = color_spaces[i].GetTransferMatrix(/*bit_depth=*/8);
SkM44 range_adjust = color_spaces[i].GetRangeAdjustMatrix(/*bit_depth=*/8);
SkM44 range_adjust_inv;
EXPECT_TRUE(range_adjust.invert(&range_adjust_inv));
for (size_t j = 0; j < kNumTestRGBs; ++j) {
SkV4 yuv = range_adjust_inv * transfer * test_rgbs[j];
EXPECT_LT(Diff(yuv, expected_yuvs[i][j]), kEpsilon);
}
}
}
TEST(ColorSpace, RangeAdjust) {
const float kEpsilon = 1.0e-3f;
const size_t kNumTestYUVs = 2;
std::array<SkV4, kNumTestYUVs> test_yuvs = {{
{1.f, 1.f, 1.f, 1.f},
{0.f, 0.f, 0.f, 1.f},
}};
const size_t kNumBitDepths = 3;
std::array<int, kNumBitDepths> bit_depths = {8, 10, 12};
const size_t kNumColorSpaces = 3;
std::array<ColorSpace, kNumColorSpaces> color_spaces = {
ColorSpace::CreateREC601(),
ColorSpace::CreateJpeg(),
ColorSpace(ColorSpace::PrimaryID::INVALID,
ColorSpace::TransferID::INVALID, ColorSpace::MatrixID::YCOCG,
ColorSpace::RangeID::LIMITED),
};
SkV4 expected_yuvs[kNumColorSpaces][kNumBitDepths][kNumTestYUVs] = {
// REC601
{
// 8bpc
{
{235.f / 255.f, 239.5f / 255.f, 239.5f / 255.f, 1.0000f},
{16.f / 255.f, 15.5f / 255.f, 15.5f / 255.f, 1.0000f},
},
// 10bpc
{
{940.f / 1023.f, 959.5f / 1023.f, 959.5f / 1023.f, 1.0000f},
{64.f / 1023.f, 63.5f / 1023.f, 63.5f / 1023.f, 1.0000f},
},
// 12bpc
{
{3760.f / 4095.f, 3839.5f / 4095.f, 3839.5f / 4095.f, 1.0000f},
{256.f / 4095.f, 255.5f / 4095.f, 255.5f / 4095.f, 1.0000f},
},
},
// Jpeg
{
// 8bpc
{
{1.0000f, 1.0000f, 1.0000f, 1.0000f},
{0.0000f, 0.0000f, 0.0000f, 1.0000f},
},
// 10bpc
{
{1.0000f, 1.0000f, 1.0000f, 1.0000f},
{0.0000f, 0.0000f, 0.0000f, 1.0000f},
},
// 12bpc
{
{1.0000f, 1.0000f, 1.0000f, 1.0000f},
{0.0000f, 0.0000f, 0.0000f, 1.0000f},
},
},
// YCoCg
{
// 8bpc
{
{235.f / 255.f, 235.f / 255.f, 235.f / 255.f, 1.0000f},
{16.f / 255.f, 16.f / 255.f, 16.f / 255.f, 1.0000f},
},
// 10bpc
{
{940.f / 1023.f, 940.f / 1023.f, 940.f / 1023.f, 1.0000f},
{64.f / 1023.f, 64.f / 1023.f, 64.f / 1023.f, 1.0000f},
},
// 12bpc
{
{3760.f / 4095.f, 3760.f / 4095.f, 3760.f / 4095.f, 1.0000f},
{256.f / 4095.f, 256.f / 4095.f, 256.f / 4095.f, 1.0000f},
},
},
};
for (size_t i = 0; i < kNumColorSpaces; ++i) {
for (size_t j = 0; j < kNumBitDepths; ++j) {
SkM44 range_adjust = color_spaces[i].GetRangeAdjustMatrix(bit_depths[j]);
SkM44 range_adjust_inv;
EXPECT_TRUE(range_adjust.invert(&range_adjust_inv));
for (size_t k = 0; k < kNumTestYUVs; ++k) {
SkV4 yuv = range_adjust_inv * test_yuvs[k];
EXPECT_LT(Diff(yuv, expected_yuvs[i][j][k]), kEpsilon);
}
}
}
}
TEST(ColorSpace, Blending) {
ColorSpace display_color_space;
// A linear transfer function being used for HDR should be blended using an
// sRGB-like transfer function.
display_color_space = ColorSpace::CreateSRGBLinear();
EXPECT_FALSE(display_color_space.IsSuitableForBlending());
// If not used for HDR, a linear transfer function should be left unchanged.
display_color_space = ColorSpace::CreateXYZD50();
EXPECT_TRUE(display_color_space.IsSuitableForBlending());
}
TEST(ColorSpace, ConversionToAndFromSkColorSpace) {
skcms_Matrix3x3 primary_matrix = {{
{0.205276f, 0.625671f, 0.060867f},
{0.149185f, 0.063217f, 0.744553f},
{0.609741f, 0.311111f, 0.019470f},
}};
skcms_TransferFunction transfer_fn = {2.1f, 1.f, 0.f, 0.f, 0.f, 0.f, 0.f};
auto color_spaces = std::to_array<ColorSpace>({
ColorSpace(ColorSpace::PrimaryID::BT709, ColorSpace::TransferID::SRGB),
ColorSpace(ColorSpace::PrimaryID::ADOBE_RGB,
ColorSpace::TransferID::SRGB),
ColorSpace(ColorSpace::PrimaryID::P3, ColorSpace::TransferID::LINEAR),
ColorSpace(ColorSpace::PrimaryID::BT2020, ColorSpace::TransferID::SRGB),
ColorSpace::CreateCustom(primary_matrix, transfer_fn),
// HDR
ColorSpace::CreateSRGBLinear(),
});
auto sk_color_spaces = std::to_array<sk_sp<SkColorSpace>>({
SkColorSpace::MakeSRGB(),
SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kAdobeRGB),
SkColorSpace::MakeRGB(SkNamedTransferFn::kLinear,
SkNamedGamut::kDisplayP3),
SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kRec2020),
SkColorSpace::MakeRGB(transfer_fn, primary_matrix),
// HDR
SkColorSpace::MakeSRGBLinear(),
});
static_assert(std::size(color_spaces) == std::size(sk_color_spaces), "");
// Test that converting from ColorSpace to SkColorSpace is producing an
// equivalent representation.
for (size_t i = 0; i < std::size(color_spaces); ++i) {
EXPECT_TRUE(SkColorSpace::Equals(color_spaces[i].ToSkColorSpace().get(),
sk_color_spaces[i].get()))
<< " on iteration i = " << i;
}
// Invariant test: Test that converting a SkColorSpace to a ColorSpace is
// producing an equivalent representation; and then converting the converted
// ColorSpace back to SkColorSpace is also producing an equivalent
// representation.
for (size_t i = 0; i < std::size(color_spaces); ++i) {
const ColorSpace from_sk_color_space(*sk_color_spaces[i],
color_spaces[i].IsHDR());
EXPECT_EQ(color_spaces[i], from_sk_color_space);
EXPECT_TRUE(SkColorSpace::Equals(
sk_color_spaces[i].get(), from_sk_color_space.ToSkColorSpace().get()));
}
}
TEST(ColorSpace, PQAndHLGToSkColorSpace) {
const float kEpsilon = 1.0e-2f;
const auto hlg = ColorSpace::CreateHLG();
const auto pq = ColorSpace::CreateHDR10();
// For each test case, `pq_signal` maps to `pq_nits`.
constexpr size_t kNumCases = 3;
std::array<float, kNumCases> pq_signal = {
0.508078421517399f,
0.5806888810416109f,
0.6765848107833876,
};
std::array<float, kNumCases> pq_nits = {
100,
203,
500,
};
const float kPQSignalFor203Nits = pq_signal[1];
const float kHLGSignalFor203Nits = 0.75f;
for (size_t i = 0; i < kNumCases; ++i) {
const float sdr_white_level = pq_nits[i];
sk_sp<SkColorSpace> sk_hlg = hlg.ToSkColorSpace(sdr_white_level);
sk_sp<SkColorSpace> sk_pq = pq.ToSkColorSpace(sdr_white_level);
// The PQ signal that maps to `sdr_white_level` nits should map to 1.
skcms_TransferFunction pq_fn = {0};
sk_pq->transferFn(&pq_fn);
EXPECT_NEAR(1.f, skcms_TransferFunction_eval(&pq_fn, pq_signal[i]),
kEpsilon);
// The HLG signal value of 0.75 should always map to the same value that
// the PQ signal for 203 nits maps to.
skcms_TransferFunction hlg_fn = {0};
sk_hlg->transferFn(&hlg_fn);
EXPECT_NEAR(skcms_TransferFunction_eval(&pq_fn, kPQSignalFor203Nits),
skcms_TransferFunction_eval(&hlg_fn, kHLGSignalFor203Nits),
kEpsilon);
}
}
TEST(ColorSpace, MixedInvalid) {
ColorSpace color_space;
color_space = color_space.GetWithMatrixAndRange(ColorSpace::MatrixID::INVALID,
ColorSpace::RangeID::INVALID);
EXPECT_TRUE(!color_space.IsValid());
color_space = color_space.GetWithMatrixAndRange(
ColorSpace::MatrixID::SMPTE170M, ColorSpace::RangeID::LIMITED);
EXPECT_TRUE(!color_space.IsValid());
}
TEST(ColorSpace, MixedSRGBWithRec601) {
const ColorSpace expected_color_space =
ColorSpace(ColorSpace::PrimaryID::BT709, ColorSpace::TransferID::SRGB,
ColorSpace::MatrixID::SMPTE170M, ColorSpace::RangeID::LIMITED);
ColorSpace color_space = ColorSpace::CreateSRGB();
color_space = color_space.GetWithMatrixAndRange(
ColorSpace::MatrixID::SMPTE170M, ColorSpace::RangeID::LIMITED);
EXPECT_TRUE(expected_color_space.IsValid());
EXPECT_EQ(color_space, expected_color_space);
}
TEST(ColorSpace, MixedHDR10WithRec709) {
const ColorSpace expected_color_space =
ColorSpace(ColorSpace::PrimaryID::BT2020, ColorSpace::TransferID::PQ,
ColorSpace::MatrixID::BT709, ColorSpace::RangeID::LIMITED);
ColorSpace color_space = ColorSpace::CreateHDR10();
color_space = color_space.GetWithMatrixAndRange(ColorSpace::MatrixID::BT709,
ColorSpace::RangeID::LIMITED);
EXPECT_TRUE(expected_color_space.IsValid());
EXPECT_EQ(color_space, expected_color_space);
}
TEST(ColorSpace, GetsPrimariesTransferMatrixAndRange) {
ColorSpace color_space(
ColorSpace::PrimaryID::BT709, ColorSpace::TransferID::BT709,
ColorSpace::MatrixID::BT709, ColorSpace::RangeID::LIMITED);
EXPECT_EQ(color_space.GetPrimaryID(), ColorSpace::PrimaryID::BT709);
EXPECT_EQ(color_space.GetTransferID(), ColorSpace::TransferID::BT709);
EXPECT_EQ(color_space.GetMatrixID(), ColorSpace::MatrixID::BT709);
EXPECT_EQ(color_space.GetRangeID(), ColorSpace::RangeID::LIMITED);
}
TEST(ColorSpace, ExpectationsMatchSRGB) {
ColorSpace::PrimaryID primary_ids[] = {
ColorSpace::PrimaryID::BT709,
ColorSpace::PrimaryID::BT470M,
ColorSpace::PrimaryID::BT470BG,
ColorSpace::PrimaryID::SMPTE170M,
ColorSpace::PrimaryID::SMPTE240M,
ColorSpace::PrimaryID::FILM,
ColorSpace::PrimaryID::BT2020,
ColorSpace::PrimaryID::SMPTEST428_1,
ColorSpace::PrimaryID::SMPTEST431_2,
ColorSpace::PrimaryID::P3,
ColorSpace::PrimaryID::XYZ_D50,
ColorSpace::PrimaryID::ADOBE_RGB,
ColorSpace::PrimaryID::APPLE_GENERIC_RGB,
ColorSpace::PrimaryID::WIDE_GAMUT_COLOR_SPIN,
};
// Create a custom color space with the sRGB primary matrix.
ColorSpace srgb = ColorSpace::CreateSRGB();
skcms_Matrix3x3 to_XYZD50;
srgb.GetPrimaryMatrix(&to_XYZD50);
ColorSpace custom_srgb =
ColorSpace::CreateCustom(to_XYZD50, ColorSpace::TransferID::SRGB);
for (auto id : primary_ids) {
ColorSpace color_space(id, ColorSpace::TransferID::SRGB);
// The precomputed results for Contains(sRGB) should match the calculation
// performed on a custom color space with sRGB primaries.
EXPECT_EQ(color_space.Contains(srgb), color_space.Contains(custom_srgb));
}
}
TEST(ColorSpaceUtil, SkcmsMatrixConvert) {
skcms_Matrix3x3 in_m33 = SkNamedGamut::kSRGB;
SkM44 m44 = SkM44FromSkcmsMatrix3x3(in_m33);
skcms_Matrix3x3 out_m33 = SkcmsMatrix3x3FromSkM44(m44);
EXPECT_EQ(memcmp(&in_m33, &out_m33, sizeof(in_m33)), 0);
}
} // namespace
} // namespace gfx
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