| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <algorithm> |
| #include <cmath> |
| #include <tuple> |
| |
| #include "testing/gtest/include/gtest/gtest.h" |
| #include "ui/gfx/color_space.h" |
| #include "ui/gfx/skia_color_space_util.h" |
| |
| namespace gfx { |
| namespace { |
| |
| // Returns the L-infty difference of u and v. |
| float Diff(const skia::Vector4& u, const skia::Vector4& v) { |
| float result = 0; |
| for (size_t i = 0; i < 4; ++i) |
| result = std::max(result, std::abs(u.fData[i] - v.fData[i])); |
| return result; |
| } |
| |
| TEST(ColorSpace, RGBToYUV) { |
| const float kEpsilon = 1.0e-3f; |
| const size_t kNumTestRGBs = 3; |
| skia::Vector4 test_rgbs[kNumTestRGBs] = { |
| skia::Vector4(1.f, 0.f, 0.f, 1.f), |
| skia::Vector4(0.f, 1.f, 0.f, 1.f), |
| skia::Vector4(0.f, 0.f, 1.f, 1.f), |
| }; |
| |
| const size_t kNumColorSpaces = 4; |
| gfx::ColorSpace color_spaces[kNumColorSpaces] = { |
| gfx::ColorSpace::CreateREC601(), |
| gfx::ColorSpace::CreateREC709(), |
| gfx::ColorSpace::CreateJpeg(), |
| gfx::ColorSpace::CreateXYZD50(), |
| }; |
| |
| skia::Vector4 expected_yuvs[kNumColorSpaces][kNumTestRGBs] = { |
| // REC601 |
| { |
| skia::Vector4(0.3195f, 0.3518f, 0.9392f, 1.0000f), |
| skia::Vector4(0.5669f, 0.2090f, 0.1322f, 1.0000f), |
| skia::Vector4(0.1607f, 0.9392f, 0.4286f, 1.0000f), |
| }, |
| // REC709 |
| { |
| skia::Vector4(0.2453f, 0.3994f, 0.9392f, 1.0000f), |
| skia::Vector4(0.6770f, 0.1614f, 0.1011f, 1.0000f), |
| skia::Vector4(0.1248f, 0.9392f, 0.4597f, 1.0000f), |
| }, |
| // Jpeg |
| { |
| skia::Vector4(0.2990f, 0.3313f, 1.0000f, 1.0000f), |
| skia::Vector4(0.5870f, 0.1687f, 0.0813f, 1.0000f), |
| skia::Vector4(0.1140f, 1.0000f, 0.4187f, 1.0000f), |
| }, |
| // XYZD50 |
| { |
| skia::Vector4(1.0000f, 0.0000f, 0.0000f, 1.0000f), |
| skia::Vector4(0.0000f, 1.0000f, 0.0000f, 1.0000f), |
| skia::Vector4(0.0000f, 0.0000f, 1.0000f, 1.0000f), |
| }, |
| }; |
| |
| for (size_t i = 0; i < kNumColorSpaces; ++i) { |
| skia::Matrix44 transfer; |
| color_spaces[i].GetTransferMatrix(/*bit_depth=*/8, &transfer); |
| |
| skia::Matrix44 range_adjust; |
| color_spaces[i].GetRangeAdjustMatrix(/*bit_depth=*/8, &range_adjust); |
| |
| skia::Matrix44 range_adjust_inv; |
| range_adjust.invert(&range_adjust_inv); |
| |
| for (size_t j = 0; j < kNumTestRGBs; ++j) { |
| skia::Vector4 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; |
| skia::Vector4 test_yuvs[kNumTestYUVs] = { |
| skia::Vector4(1.f, 1.f, 1.f, 1.f), |
| skia::Vector4(0.f, 0.f, 0.f, 1.f), |
| }; |
| |
| const size_t kNumBitDepths = 3; |
| int bit_depths[kNumBitDepths] = {8, 10, 12}; |
| |
| const size_t kNumColorSpaces = 3; |
| ColorSpace color_spaces[kNumColorSpaces] = { |
| ColorSpace::CreateREC601(), |
| ColorSpace::CreateJpeg(), |
| ColorSpace(ColorSpace::PrimaryID::INVALID, |
| ColorSpace::TransferID::INVALID, ColorSpace::MatrixID::YCOCG, |
| ColorSpace::RangeID::LIMITED), |
| }; |
| |
| skia::Vector4 expected_yuvs[kNumColorSpaces][kNumBitDepths][kNumTestYUVs] = { |
| // REC601 |
| { |
| // 8bpc |
| { |
| skia::Vector4(235.f / 255.f, 239.5f / 255.f, 239.5f / 255.f, |
| 1.0000f), |
| skia::Vector4(16.f / 255.f, 15.5f / 255.f, 15.5f / 255.f, |
| 1.0000f), |
| }, |
| // 10bpc |
| { |
| skia::Vector4(940.f / 1023.f, 959.5f / 1023.f, 959.5f / 1023.f, |
| 1.0000f), |
| skia::Vector4(64.f / 1023.f, 63.5f / 1023.f, 63.5f / 1023.f, |
| 1.0000f), |
| }, |
| // 12bpc |
| { |
| skia::Vector4(3760.f / 4095.f, 3839.5f / 4095.f, 3839.5f / 4095.f, |
| 1.0000f), |
| skia::Vector4(256.f / 4095.f, 255.5f / 4095.f, 255.5f / 4095.f, |
| 1.0000f), |
| }, |
| }, |
| // Jpeg |
| { |
| // 8bpc |
| { |
| skia::Vector4(1.0000f, 1.0000f, 1.0000f, 1.0000f), |
| skia::Vector4(0.0000f, 0.0000f, 0.0000f, 1.0000f), |
| }, |
| // 10bpc |
| { |
| skia::Vector4(1.0000f, 1.0000f, 1.0000f, 1.0000f), |
| skia::Vector4(0.0000f, 0.0000f, 0.0000f, 1.0000f), |
| }, |
| // 12bpc |
| { |
| skia::Vector4(1.0000f, 1.0000f, 1.0000f, 1.0000f), |
| skia::Vector4(0.0000f, 0.0000f, 0.0000f, 1.0000f), |
| }, |
| }, |
| // YCoCg |
| { |
| // 8bpc |
| { |
| skia::Vector4(235.f / 255.f, 235.f / 255.f, 235.f / 255.f, |
| 1.0000f), |
| skia::Vector4(16.f / 255.f, 16.f / 255.f, 16.f / 255.f, 1.0000f), |
| }, |
| // 10bpc |
| { |
| skia::Vector4(940.f / 1023.f, 940.f / 1023.f, 940.f / 1023.f, |
| 1.0000f), |
| skia::Vector4(64.f / 1023.f, 64.f / 1023.f, 64.f / 1023.f, |
| 1.0000f), |
| }, |
| // 12bpc |
| { |
| skia::Vector4(3760.f / 4095.f, 3760.f / 4095.f, 3760.f / 4095.f, |
| 1.0000f), |
| skia::Vector4(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) { |
| skia::Matrix44 range_adjust; |
| color_spaces[i].GetRangeAdjustMatrix(bit_depths[j], &range_adjust); |
| |
| skia::Matrix44 range_adjust_inv; |
| range_adjust.invert(&range_adjust_inv); |
| |
| for (size_t k = 0; k < kNumTestYUVs; ++k) { |
| skia::Vector4 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::CreateSCRGBLinear(); |
| 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) { |
| const size_t kNumTests = 5; |
| 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}; |
| |
| ColorSpace color_spaces[kNumTests] = { |
| ColorSpace(ColorSpace::PrimaryID::BT709, |
| ColorSpace::TransferID::IEC61966_2_1), |
| ColorSpace(ColorSpace::PrimaryID::ADOBE_RGB, |
| ColorSpace::TransferID::IEC61966_2_1), |
| ColorSpace(ColorSpace::PrimaryID::SMPTEST432_1, |
| ColorSpace::TransferID::LINEAR), |
| ColorSpace(ColorSpace::PrimaryID::BT2020, |
| ColorSpace::TransferID::IEC61966_2_1), |
| ColorSpace::CreateCustom(primary_matrix, transfer_fn), |
| }; |
| sk_sp<SkColorSpace> sk_color_spaces[kNumTests] = { |
| 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), |
| }; |
| |
| // Test that converting from ColorSpace to SkColorSpace is producing an |
| // equivalent representation. |
| for (size_t i = 0; i < kNumTests; ++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 < kNumTests; ++i) { |
| const ColorSpace from_sk_color_space(*sk_color_spaces[i]); |
| 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, PQToSkColorSpace) { |
| ColorSpace color_space; |
| ColorSpace roundtrip_color_space; |
| float roundtrip_sdr_white_level; |
| const float kEpsilon = 1.e-5f; |
| |
| // We expect that when a white point is specified, the conversion from |
| // ColorSpace -> SkColorSpace -> ColorSpace be the identity. Because of |
| // rounding error, this will not quite be the case. |
| color_space = ColorSpace::CreateHDR10(50.f); |
| roundtrip_color_space = ColorSpace(*color_space.ToSkColorSpace()); |
| EXPECT_TRUE( |
| roundtrip_color_space.GetSDRWhiteLevel(&roundtrip_sdr_white_level)); |
| EXPECT_NEAR(50.f, roundtrip_sdr_white_level, kEpsilon); |
| EXPECT_EQ(ColorSpace::TransferID::SMPTEST2084, |
| roundtrip_color_space.GetTransferID()); |
| |
| // When no white level is specified, we should get an SkColorSpace that |
| // specifies the default white level. Of note is that in the roundtrip, the |
| // value of kDefaultSDRWhiteLevel gets baked in. |
| color_space = ColorSpace::CreateHDR10(); |
| roundtrip_color_space = ColorSpace(*color_space.ToSkColorSpace()); |
| EXPECT_TRUE( |
| roundtrip_color_space.GetSDRWhiteLevel(&roundtrip_sdr_white_level)); |
| EXPECT_NEAR(ColorSpace::kDefaultSDRWhiteLevel, roundtrip_sdr_white_level, |
| kEpsilon); |
| } |
| |
| TEST(ColorSpace, HLGToSkColorSpace) { |
| ColorSpace color_space; |
| ColorSpace roundtrip_color_space; |
| float roundtrip_sdr_white_level; |
| const float kEpsilon = 1.0e-3f; |
| |
| // We expect that when a white point is specified, the conversion from |
| // ColorSpace -> SkColorSpace -> ColorSpace be the identity. Because of |
| // rounding error, this will not quite be the case. |
| constexpr float kSDRWhiteLevel = 50.0f; |
| color_space = ColorSpace::CreateHLG().GetWithSDRWhiteLevel(kSDRWhiteLevel); |
| roundtrip_color_space = ColorSpace(*color_space.ToSkColorSpace()); |
| EXPECT_TRUE( |
| roundtrip_color_space.GetSDRWhiteLevel(&roundtrip_sdr_white_level)); |
| EXPECT_FLOAT_EQ(kSDRWhiteLevel, roundtrip_sdr_white_level); |
| EXPECT_EQ(ColorSpace::TransferID::ARIB_STD_B67, |
| roundtrip_color_space.GetTransferID()); |
| |
| // When no white level is specified, we should get an SkColorSpace that |
| // specifies the default white level. Of note is that in the roundtrip, the |
| // value of kDefaultSDRWhiteLevel gets baked in. |
| color_space = ColorSpace::CreateHLG(); |
| roundtrip_color_space = ColorSpace(*color_space.ToSkColorSpace()); |
| EXPECT_TRUE( |
| roundtrip_color_space.GetSDRWhiteLevel(&roundtrip_sdr_white_level)); |
| EXPECT_NEAR(ColorSpace::kDefaultSDRWhiteLevel, roundtrip_sdr_white_level, |
| 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::IEC61966_2_1, |
| 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::SMPTEST2084, |
| 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, PQWhiteLevel) { |
| constexpr float kCustomWhiteLevel = 200.f; |
| |
| ColorSpace color_space = ColorSpace::CreateHDR10(kCustomWhiteLevel); |
| EXPECT_EQ(color_space.GetTransferID(), ColorSpace::TransferID::SMPTEST2084); |
| float sdr_white_level; |
| EXPECT_TRUE(color_space.GetSDRWhiteLevel(&sdr_white_level)); |
| EXPECT_EQ(sdr_white_level, kCustomWhiteLevel); |
| |
| color_space = ColorSpace::CreateHDR10(); |
| EXPECT_EQ(color_space.GetTransferID(), ColorSpace::TransferID::SMPTEST2084); |
| EXPECT_TRUE(color_space.GetSDRWhiteLevel(&sdr_white_level)); |
| EXPECT_EQ(sdr_white_level, ColorSpace::kDefaultSDRWhiteLevel); |
| |
| color_space = color_space.GetWithSDRWhiteLevel(kCustomWhiteLevel); |
| EXPECT_EQ(color_space.GetTransferID(), ColorSpace::TransferID::SMPTEST2084); |
| EXPECT_TRUE(color_space.GetSDRWhiteLevel(&sdr_white_level)); |
| EXPECT_EQ(sdr_white_level, kCustomWhiteLevel); |
| |
| constexpr float kCustomWhiteLevel2 = kCustomWhiteLevel * 2; |
| color_space = color_space.GetWithSDRWhiteLevel(kCustomWhiteLevel2); |
| EXPECT_EQ(color_space.GetTransferID(), ColorSpace::TransferID::SMPTEST2084); |
| EXPECT_TRUE(color_space.GetSDRWhiteLevel(&sdr_white_level)); |
| EXPECT_EQ(sdr_white_level, kCustomWhiteLevel2); |
| } |
| |
| TEST(ColorSpace, LinearHDRWhiteLevel) { |
| constexpr float kCustomWhiteLevel = 200.f; |
| constexpr float kCustomSlope = |
| ColorSpace::kDefaultScrgbLinearSdrWhiteLevel / kCustomWhiteLevel; |
| |
| ColorSpace color_space = ColorSpace::CreateSCRGBLinear(kCustomWhiteLevel); |
| skcms_TransferFunction fn; |
| EXPECT_EQ(color_space.GetTransferID(), ColorSpace::TransferID::CUSTOM_HDR); |
| EXPECT_TRUE(color_space.GetTransferFunction(&fn)); |
| EXPECT_EQ(std::make_tuple(fn.g, fn.a, fn.b, fn.c, fn.d, fn.e, fn.f), |
| std::make_tuple(1.f, kCustomSlope, 0.f, 0.f, 0.f, 0.f, 0.f)); |
| |
| color_space = ColorSpace::CreateSCRGBLinear(); |
| EXPECT_EQ(color_space.GetTransferID(), ColorSpace::TransferID::LINEAR_HDR); |
| EXPECT_TRUE(color_space.GetTransferFunction(&fn)); |
| EXPECT_EQ(std::make_tuple(fn.g, fn.a, fn.b, fn.c, fn.d, fn.e, fn.f), |
| std::make_tuple(1.f, 1.f, 0.f, 0.f, 0.f, 0.f, 0.f)); |
| |
| color_space = color_space.GetWithSDRWhiteLevel(kCustomWhiteLevel); |
| EXPECT_EQ(color_space.GetTransferID(), ColorSpace::TransferID::CUSTOM_HDR); |
| EXPECT_TRUE(color_space.GetTransferFunction(&fn)); |
| EXPECT_EQ(std::make_tuple(fn.g, fn.a, fn.b, fn.c, fn.d, fn.e, fn.f), |
| std::make_tuple(1.f, kCustomSlope, 0.f, 0.f, 0.f, 0.f, 0.f)); |
| } |
| |
| 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::SMPTEST432_1, |
| 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::IEC61966_2_1); |
| |
| for (auto id : primary_ids) { |
| ColorSpace color_space(id, ColorSpace::TransferID::IEC61966_2_1); |
| // 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)); |
| } |
| } |
| |
| } // namespace |
| } // namespace gfx |
