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skia2/tests/ColorSpaceTest.cpp
Mike Klein 273b74a858 fix two 1-bit mismatches in sRGB transfer functions 
The Skia and skcms 'a' and 'b' terms disagree in the low bit.
'd' was exactly the same, but I've rewritten Skia's to match anyway.

Guarded by SK_LEGACY_SRGB_TRANSFER_FUNCTION.  *grumble*

Bug: skia:8278

Change-Id: Ie799f155cbe9c6a1fbe9043c827b8f79d04e1d96
Reviewed-on: https://skia-review.googlesource.com/150130
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2018-08-29 17:49:20 +00:00

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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 "Resources.h"
#include "SkCodec.h"
#include "SkColorSpace.h"
#include "SkColorSpacePriv.h"
#include "SkColorSpace_XYZ.h"
#include "SkData.h"
#include "SkImageInfo.h"
#include "SkMatrix44.h"
#include "SkRefCnt.h"
#include "SkStream.h"
#include "SkTypes.h"
#include "Test.h"
#include "png.h"
#include "../third_party/skcms/skcms.h"
#include <memory>
#include <utility>
static bool almost_equal(float a, float b) {
return SkTAbs(a - b) < 0.001f;
}
static void test_space(skiatest::Reporter* r, SkColorSpace* space,
const float red[], const float green[], const float blue[],
const SkGammaNamed expectedGamma) {
REPORTER_ASSERT(r, nullptr != space);
REPORTER_ASSERT(r, expectedGamma == space->gammaNamed());
const SkMatrix44& mat = *space->toXYZD50();
const float src[] = {
1, 0, 0, 1,
0, 1, 0, 1,
0, 0, 1, 1,
};
const float* ref[3] = { red, green, blue };
float dst[4];
for (int i = 0; i < 3; ++i) {
mat.mapScalars(&src[i*4], dst);
REPORTER_ASSERT(r, almost_equal(ref[i][0], dst[0]));
REPORTER_ASSERT(r, almost_equal(ref[i][1], dst[1]));
REPORTER_ASSERT(r, almost_equal(ref[i][2], dst[2]));
}
}
static void test_path(skiatest::Reporter* r, const char* path,
const float red[], const float green[], const float blue[],
const SkGammaNamed expectedGamma) {
std::unique_ptr<SkStream> stream(GetResourceAsStream(path));
REPORTER_ASSERT(r, nullptr != stream);
if (!stream) {
return;
}
std::unique_ptr<SkCodec> codec(SkCodec::MakeFromStream(std::move(stream)));
REPORTER_ASSERT(r, nullptr != codec);
if (!codec) {
return;
}
SkColorSpace* colorSpace = codec->getInfo().colorSpace();
test_space(r, colorSpace, red, green, blue, expectedGamma);
}
static constexpr float g_sRGB_XYZ[]{
0.4358f, 0.3853f, 0.1430f, // Rx, Gx, Bx
0.2224f, 0.7170f, 0.0606f, // Ry, Gy, Gz
0.0139f, 0.0971f, 0.7139f, // Rz, Gz, Bz
};
static constexpr float g_sRGB_R[]{ 0.4358f, 0.2224f, 0.0139f };
static constexpr float g_sRGB_G[]{ 0.3853f, 0.7170f, 0.0971f };
static constexpr float g_sRGB_B[]{ 0.1430f, 0.0606f, 0.7139f };
DEF_TEST(ColorSpace_sRGB, r) {
test_space(r, sk_srgb_singleton(),
g_sRGB_R, g_sRGB_G, g_sRGB_B, kSRGB_SkGammaNamed);
}
DEF_TEST(ColorSpaceParseICCProfiles, r) {
#if (PNG_LIBPNG_VER_MAJOR > 1) || (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR >= 6)
test_path(r, "images/color_wheel_with_profile.png", g_sRGB_R, g_sRGB_G, g_sRGB_B,
kSRGB_SkGammaNamed);
#endif
const float red[] = { 0.385117f, 0.716904f, 0.0970612f };
const float green[] = { 0.143051f, 0.0606079f, 0.713913f };
const float blue[] = { 0.436035f, 0.222488f, 0.013916f };
test_path(r, "images/icc-v2-gbr.jpg", red, green, blue, k2Dot2Curve_SkGammaNamed);
test_path(r, "images/webp-color-profile-crash.webp",
red, green, blue, kNonStandard_SkGammaNamed);
test_path(r, "images/webp-color-profile-lossless.webp",
red, green, blue, kNonStandard_SkGammaNamed);
test_path(r, "images/webp-color-profile-lossy.webp",
red, green, blue, kNonStandard_SkGammaNamed);
test_path(r, "images/webp-color-profile-lossy-alpha.webp",
red, green, blue, kNonStandard_SkGammaNamed);
}
DEF_TEST(ColorSpaceSRGBCompare, r) {
// Create an sRGB color space by name
sk_sp<SkColorSpace> namedColorSpace = SkColorSpace::MakeSRGB();
// Create an sRGB color space by value
SkMatrix44 srgbToxyzD50(SkMatrix44::kUninitialized_Constructor);
srgbToxyzD50.set3x3RowMajorf(g_sRGB_XYZ);
sk_sp<SkColorSpace> rgbColorSpace =
SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma, srgbToxyzD50);
REPORTER_ASSERT(r, rgbColorSpace == namedColorSpace);
SkColorSpaceTransferFn srgbFn;
srgbFn.fA = (1.0f / 1.055f);
srgbFn.fB = (0.055f / 1.055f);
srgbFn.fC = (1.0f / 12.92f);
srgbFn.fD = 0.04045f;
srgbFn.fE = 0.0f;
srgbFn.fF = 0.0f;
srgbFn.fG = 2.4f;
sk_sp<SkColorSpace> rgbColorSpace2 = SkColorSpace::MakeRGB(srgbFn, srgbToxyzD50);
REPORTER_ASSERT(r, rgbColorSpace2 == namedColorSpace);
// Change a single value from the sRGB matrix
srgbToxyzD50.set(2, 2, 0.5f);
sk_sp<SkColorSpace> strangeColorSpace =
SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma, srgbToxyzD50);
REPORTER_ASSERT(r, strangeColorSpace != namedColorSpace);
}
DEF_TEST(ColorSpaceSRGBLinearCompare, r) {
// Create the linear sRGB color space by name
sk_sp<SkColorSpace> namedColorSpace = SkColorSpace::MakeSRGBLinear();
// Create the linear sRGB color space via the sRGB color space's makeLinearGamma()
auto srgb = SkColorSpace::MakeSRGB();
auto srgbXYZ = static_cast<SkColorSpace_XYZ*>(srgb.get());
sk_sp<SkColorSpace> viaSrgbColorSpace = srgbXYZ->makeLinearGamma();
REPORTER_ASSERT(r, namedColorSpace == viaSrgbColorSpace);
// Create a linear sRGB color space by value
SkMatrix44 srgbToxyzD50(SkMatrix44::kUninitialized_Constructor);
srgbToxyzD50.set3x3RowMajorf(g_sRGB_XYZ);
sk_sp<SkColorSpace> rgbColorSpace =
SkColorSpace::MakeRGB(SkColorSpace::kLinear_RenderTargetGamma, srgbToxyzD50);
REPORTER_ASSERT(r, rgbColorSpace == namedColorSpace);
SkColorSpaceTransferFn linearExpFn;
linearExpFn.fA = 1.0f;
linearExpFn.fB = 0.0f;
linearExpFn.fC = 0.0f;
linearExpFn.fD = 0.0f;
linearExpFn.fE = 0.0f;
linearExpFn.fF = 0.0f;
linearExpFn.fG = 1.0f;
sk_sp<SkColorSpace> rgbColorSpace2 = SkColorSpace::MakeRGB(linearExpFn, srgbToxyzD50);
REPORTER_ASSERT(r, rgbColorSpace2 == namedColorSpace);
SkColorSpaceTransferFn linearFn;
linearFn.fA = 0.0f;
linearFn.fB = 0.0f;
linearFn.fC = 1.0f;
linearFn.fD = 1.0f;
linearFn.fE = 0.0f;
linearFn.fF = 0.0f;
linearFn.fG = 0.0f;
sk_sp<SkColorSpace> rgbColorSpace3 = SkColorSpace::MakeRGB(linearFn, srgbToxyzD50);
REPORTER_ASSERT(r, rgbColorSpace3 == namedColorSpace);
// Change a single value from the sRGB matrix
srgbToxyzD50.set(2, 2, 0.5f);
sk_sp<SkColorSpace> strangeColorSpace =
SkColorSpace::MakeRGB(SkColorSpace::kLinear_RenderTargetGamma, srgbToxyzD50);
REPORTER_ASSERT(r, strangeColorSpace != namedColorSpace);
}
static void test_serialize(skiatest::Reporter* r, sk_sp<SkColorSpace> space, bool isNamed) {
sk_sp<SkData> data1 = space->serialize();
size_t bytes = space->writeToMemory(nullptr);
sk_sp<SkData> data2 = SkData::MakeUninitialized(bytes);
space->writeToMemory(data2->writable_data());
sk_sp<SkColorSpace> newSpace1 = SkColorSpace::Deserialize(data1->data(), data1->size());
sk_sp<SkColorSpace> newSpace2 = SkColorSpace::Deserialize(data2->data(), data2->size());
if (isNamed) {
REPORTER_ASSERT(r, space.get() == newSpace1.get());
REPORTER_ASSERT(r, space.get() == newSpace2.get());
} else {
REPORTER_ASSERT(r, SkColorSpace::Equals(space.get(), newSpace1.get()));
REPORTER_ASSERT(r, SkColorSpace::Equals(space.get(), newSpace2.get()));
}
}
DEF_TEST(ColorSpace_Serialize, r) {
test_serialize(r, SkColorSpace::MakeSRGB(), true);
test_serialize(r, SkColorSpace::MakeSRGBLinear(), true);
auto test = [&](const char* path) {
sk_sp<SkData> data = GetResourceAsData(path);
skcms_ICCProfile profile;
REPORTER_ASSERT(r, skcms_Parse(data->data(), data->size(), &profile));
sk_sp<SkColorSpace> space = SkColorSpace::Make(profile);
REPORTER_ASSERT(r, space);
test_serialize(r, space, false);
};
test("icc_profiles/HP_ZR30w.icc");
test("icc_profiles/HP_Z32x.icc");
SkColorSpaceTransferFn fn;
fn.fA = 1.0f;
fn.fB = 0.0f;
fn.fC = 1.0f;
fn.fD = 0.5f;
fn.fE = 0.0f;
fn.fF = 0.0f;
fn.fG = 1.0f;
SkMatrix44 toXYZ(SkMatrix44::kIdentity_Constructor);
test_serialize(r, SkColorSpace::MakeRGB(fn, toXYZ), false);
}
DEF_TEST(ColorSpace_Equals, r) {
sk_sp<SkColorSpace> srgb = SkColorSpace::MakeSRGB();
auto parse = [&](const char* path) {
sk_sp<SkData> data = GetResourceAsData(path);
skcms_ICCProfile profile;
REPORTER_ASSERT(r, skcms_Parse(data->data(), data->size(), &profile));
sk_sp<SkColorSpace> space = SkColorSpace::Make(profile);
REPORTER_ASSERT(r, space);
return space;
};
sk_sp<SkColorSpace> z30 = parse("icc_profiles/HP_ZR30w.icc");
sk_sp<SkColorSpace> z32 = parse("icc_profiles/HP_Z32x.icc");
SkColorSpaceTransferFn fn;
fn.fA = 1.0f;
fn.fB = 0.0f;
fn.fC = 1.0f;
fn.fD = 0.5f;
fn.fE = 0.0f;
fn.fF = 0.0f;
fn.fG = 1.0f;
SkMatrix44 toXYZ(SkMatrix44::kIdentity_Constructor);
sk_sp<SkColorSpace> rgb4 = SkColorSpace::MakeRGB(fn, toXYZ);
REPORTER_ASSERT(r, SkColorSpace::Equals(nullptr, nullptr));
REPORTER_ASSERT(r, SkColorSpace::Equals(srgb.get(), srgb.get()));
REPORTER_ASSERT(r, SkColorSpace::Equals(z30.get(), z30.get()));
REPORTER_ASSERT(r, SkColorSpace::Equals(z32.get(), z32.get()));
REPORTER_ASSERT(r, SkColorSpace::Equals(rgb4.get(), rgb4.get()));
REPORTER_ASSERT(r, !SkColorSpace::Equals(nullptr, srgb.get()));
REPORTER_ASSERT(r, !SkColorSpace::Equals(srgb.get(), nullptr));
REPORTER_ASSERT(r, !SkColorSpace::Equals(z30.get(), srgb.get()));
REPORTER_ASSERT(r, !SkColorSpace::Equals(z32.get(), z30.get()));
REPORTER_ASSERT(r, !SkColorSpace::Equals(z30.get(), rgb4.get()));
REPORTER_ASSERT(r, !SkColorSpace::Equals(srgb.get(), rgb4.get()));
}
static inline bool matrix_almost_equal(const SkMatrix44& a, const SkMatrix44& b) {
return almost_equal(a.get(0, 0), b.get(0, 0)) &&
almost_equal(a.get(0, 1), b.get(0, 1)) &&
almost_equal(a.get(0, 2), b.get(0, 2)) &&
almost_equal(a.get(0, 3), b.get(0, 3)) &&
almost_equal(a.get(1, 0), b.get(1, 0)) &&
almost_equal(a.get(1, 1), b.get(1, 1)) &&
almost_equal(a.get(1, 2), b.get(1, 2)) &&
almost_equal(a.get(1, 3), b.get(1, 3)) &&
almost_equal(a.get(2, 0), b.get(2, 0)) &&
almost_equal(a.get(2, 1), b.get(2, 1)) &&
almost_equal(a.get(2, 2), b.get(2, 2)) &&
almost_equal(a.get(2, 3), b.get(2, 3)) &&
almost_equal(a.get(3, 0), b.get(3, 0)) &&
almost_equal(a.get(3, 1), b.get(3, 1)) &&
almost_equal(a.get(3, 2), b.get(3, 2)) &&
almost_equal(a.get(3, 3), b.get(3, 3));
}
static inline void check_primaries(skiatest::Reporter* r, const SkColorSpacePrimaries& primaries,
const SkMatrix44& reference) {
SkMatrix44 toXYZ(SkMatrix44::kUninitialized_Constructor);
bool result = primaries.toXYZD50(&toXYZ);
REPORTER_ASSERT(r, result);
REPORTER_ASSERT(r, matrix_almost_equal(toXYZ, reference));
}
DEF_TEST(ColorSpace_Primaries, r) {
// sRGB primaries (D65)
SkColorSpacePrimaries srgb;
srgb.fRX = 0.64f;
srgb.fRY = 0.33f;
srgb.fGX = 0.30f;
srgb.fGY = 0.60f;
srgb.fBX = 0.15f;
srgb.fBY = 0.06f;
srgb.fWX = 0.3127f;
srgb.fWY = 0.3290f;
SkMatrix44 srgbToXYZ(SkMatrix44::kUninitialized_Constructor);
bool result = srgb.toXYZD50(&srgbToXYZ);
REPORTER_ASSERT(r, result);
sk_sp<SkColorSpace> space = SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma,
srgbToXYZ);
REPORTER_ASSERT(r, SkColorSpace::MakeSRGB() == space);
// ProPhoto (D50)
SkColorSpacePrimaries proPhoto;
proPhoto.fRX = 0.7347f;
proPhoto.fRY = 0.2653f;
proPhoto.fGX = 0.1596f;
proPhoto.fGY = 0.8404f;
proPhoto.fBX = 0.0366f;
proPhoto.fBY = 0.0001f;
proPhoto.fWX = 0.34567f;
proPhoto.fWY = 0.35850f;
SkMatrix44 proToXYZ(SkMatrix44::kUninitialized_Constructor);
proToXYZ.set3x3(0.7976749f, 0.2880402f, 0.0000000f,
0.1351917f, 0.7118741f, 0.0000000f,
0.0313534f, 0.0000857f, 0.8252100f);
check_primaries(r, proPhoto, proToXYZ);
// NTSC (C)
SkColorSpacePrimaries ntsc;
ntsc.fRX = 0.67f;
ntsc.fRY = 0.33f;
ntsc.fGX = 0.21f;
ntsc.fGY = 0.71f;
ntsc.fBX = 0.14f;
ntsc.fBY = 0.08f;
ntsc.fWX = 0.31006f;
ntsc.fWY = 0.31616f;
SkMatrix44 ntscToXYZ(SkMatrix44::kUninitialized_Constructor);
ntscToXYZ.set3x3(0.6343706f, 0.3109496f, -0.0011817f,
0.1852204f, 0.5915984f, 0.0555518f,
0.1446290f, 0.0974520f, 0.7708399f);
check_primaries(r, ntsc, ntscToXYZ);
// DCI P3 (D65)
SkColorSpacePrimaries p3;
p3.fRX = 0.680f;
p3.fRY = 0.320f;
p3.fGX = 0.265f;
p3.fGY = 0.690f;
p3.fBX = 0.150f;
p3.fBY = 0.060f;
p3.fWX = 0.3127f;
p3.fWY = 0.3290f;
space = SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma,
SkColorSpace::kDCIP3_D65_Gamut);
SkMatrix44 reference(SkMatrix44::kUninitialized_Constructor);
SkAssertResult(space->toXYZD50(&reference));
check_primaries(r, p3, reference);
// Rec 2020 (D65)
SkColorSpacePrimaries rec2020;
rec2020.fRX = 0.708f;
rec2020.fRY = 0.292f;
rec2020.fGX = 0.170f;
rec2020.fGY = 0.797f;
rec2020.fBX = 0.131f;
rec2020.fBY = 0.046f;
rec2020.fWX = 0.3127f;
rec2020.fWY = 0.3290f;
space = SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma,
SkColorSpace::kRec2020_Gamut);
SkAssertResult(space->toXYZD50(&reference));
check_primaries(r, rec2020, reference);
}
DEF_TEST(ColorSpace_MatrixHash, r) {
sk_sp<SkColorSpace> srgb = SkColorSpace::MakeSRGB();
SkColorSpaceTransferFn fn;
fn.fA = 1.0f;
fn.fB = 0.0f;
fn.fC = 0.0f;
fn.fD = 0.0f;
fn.fE = 0.0f;
fn.fF = 0.0f;
fn.fG = 3.0f;
SkMatrix44 srgbMat(SkMatrix44::kUninitialized_Constructor);
srgbMat.set3x3RowMajorf(gSRGB_toXYZD50);
sk_sp<SkColorSpace> strange = SkColorSpace::MakeRGB(fn, srgbMat);
REPORTER_ASSERT(r, *srgb->toXYZD50() == *strange->toXYZD50());
REPORTER_ASSERT(r, srgb->toXYZD50Hash() == strange->toXYZD50Hash());
}
DEF_TEST(ColorSpace_IsSRGB, r) {
sk_sp<SkColorSpace> srgb0 = SkColorSpace::MakeSRGB();
SkColorSpaceTransferFn fn;
fn.fA = 1.0f;
fn.fB = 0.0f;
fn.fC = 0.0f;
fn.fD = 0.0f;
fn.fE = 0.0f;
fn.fF = 0.0f;
fn.fG = 2.2f;
sk_sp<SkColorSpace> twoDotTwo = SkColorSpace::MakeRGB(fn, SkColorSpace::kSRGB_Gamut);
REPORTER_ASSERT(r, srgb0->isSRGB());
REPORTER_ASSERT(r, !twoDotTwo->isSRGB());
}
DEF_TEST(ColorSpace_skcms_IsSRGB, r) {
sk_sp<SkColorSpace> srgb = SkColorSpace::Make(*skcms_sRGB_profile());
REPORTER_ASSERT(r, srgb->isSRGB());
}
DEF_TEST(ColorSpace_skcms_sRGB_exact, r) {
skcms_ICCProfile profile;
sk_srgb_singleton()->toProfile(&profile);
REPORTER_ASSERT(r, 0 == memcmp(&profile, skcms_sRGB_profile(), sizeof(skcms_ICCProfile)));
}
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