ColorSpaceTest.cpp File Reference

#include "include/codec/SkCodec.h"
#include "include/core/SkColorSpace.h"
#include "include/core/SkData.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkStream.h"
#include "include/core/SkTypes.h"
#include "include/private/base/SkFloatingPoint.h"
#include "include/private/base/SkTemplates.h"
#include "modules/skcms/skcms.h"
#include "src/core/SkColorSpacePriv.h"
#include "tests/Test.h"
#include "tools/Resources.h"
#include <climits>
#include <cstring>
#include <memory>
#include <utility>
#include <png.h>

Go to the source code of this file.

Functions
static bool	almost_equal (float a, float b)
static void	test_space (skiatest::Reporter *r, SkColorSpace *space, const float red[], const float green[], const float blue[], bool expectSRGB=false)
static void	test_path (skiatest::Reporter *r, const char *path, const float red[], const float green[], const float blue[], bool expectSRGB=false)
	DEF_TEST (ColorSpace_sRGB, r)
	DEF_TEST (ColorSpaceParseICCProfiles, r)
static void	test_serialize (skiatest::Reporter *r, const sk_sp< SkColorSpace > &space, bool isNamed)
	DEF_TEST (ColorSpace_Serialize, r)
	DEF_TEST (ColorSpace_Equals, r)
static bool	matrix_almost_equal (const skcms_Matrix3x3 &a, const skcms_Matrix3x3 &b)
static void	check_primaries (skiatest::Reporter *r, const SkColorSpacePrimaries &primaries, const skcms_Matrix3x3 &reference)
	DEF_TEST (ColorSpace_Primaries, r)
	DEF_TEST (ColorSpace_MatrixHash, r)
	DEF_TEST (ColorSpace_IsSRGB, r)
	DEF_TEST (ColorSpace_skcms_IsSRGB, r)
	DEF_TEST (ColorSpace_skcms_sRGB_exact, r)
	DEF_TEST (ColorSpace_classifyUnderflow, r)
	DEF_TEST (ColorSpace_equiv, r)

Variables
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 }

Function Documentation

almost_equal()

static bool almost_equal ( float  a, float  b  )

static

Definition at line 29 of file ColorSpaceTest.cpp.

                                           {
    return SkTAbs(a - b) < 0.001f;
}

check_primaries()

static void check_primaries ( skiatest::Reporter *  r, const SkColorSpacePrimaries &  primaries, const skcms_Matrix3x3 &  reference  )

inlinestatic

Definition at line 219 of file ColorSpaceTest.cpp.

                                                                     {
    skcms_Matrix3x3 toXYZ;
    bool result = primaries.toXYZD50(&toXYZ);
    REPORTER_ASSERT(r, result);
    REPORTER_ASSERT(r, matrix_almost_equal(toXYZ, reference));
}

DEF_TEST() [1/11]

DEF_TEST	(	ColorSpace_classifyUnderflow	,
		r
	)

Definition at line 351 of file ColorSpaceTest.cpp.

                                          {
    // crbug.com/1016183
    skcms_TransferFunction fn;
    fn.a = 1.0f;
    fn.b = 0.0f;
    fn.c = 0.0f;
    fn.d = 0.0f;
    fn.e = 0.0f;
    fn.f = 0.0f;
    fn.g = INT_MIN;
    sk_sp<SkColorSpace> bad = SkColorSpace::MakeRGB(fn, SkNamedGamut::kSRGB);
    REPORTER_ASSERT(r, bad == nullptr);
}

DEF_TEST() [2/11]

DEF_TEST	(	ColorSpace_Equals	,
		r
	)

Definition at line 162 of file ColorSpaceTest.cpp.

                               {
    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");
 
    skcms_TransferFunction fn;
    fn.a = 1.0f;
    fn.b = 0.0f;
    fn.c = 1.0f;
    fn.d = 0.5f;
    fn.e = 0.0f;
    fn.f = 0.0f;
    fn.g = 1.0f;
    skcms_Matrix3x3 toXYZ = {{
        { 1, 0, 0 },
        { 0, 1, 0 },
        { 0, 0, 1 },
    }};
    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()));
}

DEF_TEST() [3/11]

DEF_TEST	(	ColorSpace_equiv	,
		r
	)

Definition at line 365 of file ColorSpaceTest.cpp.

                              {
    skcms_TransferFunction tf = SkNamedTransferFn::kSRGB;
    skcms_Matrix3x3     gamut = SkNamedGamut::kSRGB;
 
    // Previously a NaN anywhere in the tf or gamut would trip up Equals(),
    // making us think we'd hit a hash collision where we hadn't.
    gamut.vals[1][1] = SK_FloatNaN;
 
    // There's a quick pointer comparison in SkColorSpace::Equals() we want to get past.
    sk_sp<SkColorSpace> x = SkColorSpace::MakeRGB(tf, gamut),
                        y = SkColorSpace::MakeRGB(tf, gamut);
    REPORTER_ASSERT(r, x && y);
    REPORTER_ASSERT(r, x.get() != y.get());
 
    // Most important to test in debug mode that we don't SkASSERT().
    REPORTER_ASSERT(r, SkColorSpace::Equals(x.get(), y.get()));
}

DEF_TEST() [4/11]

DEF_TEST	(	ColorSpace_IsSRGB	,
		r
	)

Definition at line 322 of file ColorSpaceTest.cpp.

                               {
    sk_sp<SkColorSpace> srgb0 = SkColorSpace::MakeSRGB();
 
    skcms_TransferFunction fn;
    fn.a = 1.0f;
    fn.b = 0.0f;
    fn.c = 0.0f;
    fn.d = 0.0f;
    fn.e = 0.0f;
    fn.f = 0.0f;
    fn.g = 2.2f;
    sk_sp<SkColorSpace> twoDotTwo = SkColorSpace::MakeRGB(fn, SkNamedGamut::kSRGB);
 
    REPORTER_ASSERT(r, srgb0->isSRGB());
    REPORTER_ASSERT(r, !twoDotTwo->isSRGB());
}

DEF_TEST() [5/11]

DEF_TEST	(	ColorSpace_MatrixHash	,
		r
	)

Definition at line 305 of file ColorSpaceTest.cpp.

                                   {
    sk_sp<SkColorSpace> srgb = SkColorSpace::MakeSRGB();
 
    skcms_TransferFunction fn;
    fn.a = 1.0f;
    fn.b = 0.0f;
    fn.c = 0.0f;
    fn.d = 0.0f;
    fn.e = 0.0f;
    fn.f = 0.0f;
    fn.g = 3.0f;
 
    sk_sp<SkColorSpace> strange = SkColorSpace::MakeRGB(fn, SkNamedGamut::kSRGB);
 
    REPORTER_ASSERT(r, srgb->toXYZD50Hash() == strange->toXYZD50Hash());
}

DEF_TEST() [6/11]

DEF_TEST	(	ColorSpace_Primaries	,
		r
	)

Definition at line 227 of file ColorSpaceTest.cpp.

                                  {
    // sRGB primaries (D65)
    skcms_Matrix3x3 srgbToXYZ;
    bool result = skcms_PrimariesToXYZD50(
        0.64f, 0.33f,
        0.30f, 0.60f,
        0.15f, 0.06f,
        0.3127f, 0.3290f,
        &srgbToXYZ);
    REPORTER_ASSERT(r, result);
 
    sk_sp<SkColorSpace> space = SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, 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;
    skcms_Matrix3x3 proToXYZ = {{
        { 0.7976749f, 0.1351917f, 0.0313534f },
        { 0.2880402f, 0.7118741f, 0.0000857f },
        { 0.0000000f, 0.0000000f, 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;
    skcms_Matrix3x3 ntscToXYZ = {{
        {  0.6343706f, 0.1852204f, 0.1446290f },
        {  0.3109496f, 0.5915984f, 0.0974520f },
        { -0.0011817f, 0.0555518f, 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(SkNamedTransferFn::kSRGB, SkNamedGamut::kDisplayP3);
    skcms_Matrix3x3 reference;
    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(SkNamedTransferFn::kSRGB, SkNamedGamut::kRec2020);
    SkAssertResult(space->toXYZD50(&reference));
    check_primaries(r, rec2020, reference);
}

DEF_TEST() [7/11]

DEF_TEST	(	ColorSpace_Serialize	,
		r
	)

Definition at line 128 of file ColorSpaceTest.cpp.

                                  {
    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");
 
    skcms_TransferFunction fn;
    fn.a = 1.0f;
    fn.b = 0.0f;
    fn.c = 1.0f;
    fn.d = 0.5f;
    fn.e = 0.0f;
    fn.f = 0.0f;
    fn.g = 1.0f;
    skcms_Matrix3x3 toXYZ = {{
        { 1, 0, 0 },
        { 0, 1, 0 },
        { 0, 0, 1 },
    }};
    test_serialize(r, SkColorSpace::MakeRGB(fn, toXYZ), false);
}

DEF_TEST() [8/11]

DEF_TEST	(	ColorSpace_skcms_IsSRGB	,
		r
	)

Definition at line 339 of file ColorSpaceTest.cpp.

                                     {
    sk_sp<SkColorSpace> srgb = SkColorSpace::Make(*skcms_sRGB_profile());
    REPORTER_ASSERT(r, srgb->isSRGB());
}

DEF_TEST() [9/11]

DEF_TEST	(	ColorSpace_skcms_sRGB_exact	,
		r
	)

Definition at line 344 of file ColorSpaceTest.cpp.

                                         {
    skcms_ICCProfile profile;
    sk_srgb_singleton()->toProfile(&profile);
 
    REPORTER_ASSERT(r, 0 == memcmp(&profile, skcms_sRGB_profile(), sizeof(skcms_ICCProfile)));
}

DEF_TEST() [10/11]

DEF_TEST	(	ColorSpace_sRGB	,
		r
	)

Definition at line 73 of file ColorSpaceTest.cpp.

                             {
    test_space(r, sk_srgb_singleton(), g_sRGB_R, g_sRGB_G, g_sRGB_B, true);
 
}

DEF_TEST() [11/11]

DEF_TEST	(	ColorSpaceParseICCProfiles	,
		r
	)

Definition at line 78 of file ColorSpaceTest.cpp.

                                        {
 
#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, true);
#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);
 
    test_path(r, "images/webp-color-profile-crash.webp",
            red, green, blue);
    test_path(r, "images/webp-color-profile-lossless.webp",
            red, green, blue);
    test_path(r, "images/webp-color-profile-lossy.webp",
            red, green, blue);
    test_path(r, "images/webp-color-profile-lossy-alpha.webp",
            red, green, blue);
}

matrix_almost_equal()

static bool matrix_almost_equal ( const skcms_Matrix3x3 &  a, const skcms_Matrix3x3 &  b  )

inlinestatic

Definition at line 208 of file ColorSpaceTest.cpp.

                                                                                           {
    for (int r = 0; r < 3; ++r) {
        for (int c = 0; c < 3; ++c) {
            if (!almost_equal(a.vals[r][c], b.vals[r][c])) {
                return false;
            }
        }
    }
    return true;
}

test_path()

static void test_path ( skiatest::Reporter *  r, const char *  path, const float  red[], const float  green[], const float  blue[], bool  expectSRGB = false  )

static

Definition at line 50 of file ColorSpaceTest.cpp.

                                               {
    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;
    }
 
    auto colorSpace = codec->getInfo().refColorSpace();
    test_space(r, colorSpace.get(), red, green, blue, expectSRGB);
}

test_serialize()

static void test_serialize ( skiatest::Reporter *  r, const sk_sp< SkColorSpace > &  space, bool  isNamed  )

static

Definition at line 99 of file ColorSpaceTest.cpp.

                                                                                                {
    sk_sp<SkData> data1 = space->serialize();
 
    size_t bytes = space->writeToMemory(nullptr);
    sk_sp<SkData> data2 = SkData::MakeUninitialized(bytes);
    space->writeToMemory(data2->writable_data());
 
    // Handy for creating some seed data for fuzzing
#if defined(SK_DUMP_TO_DISK)
    static int counter = 0;
    SkFILEWStream outFile(SkStringPrintf("/tmp/colorspace_%d.icc", counter).c_str());
    counter += 1;
    REPORTER_ASSERT(r, outFile.write(data2->data(), data2->size()));
    outFile.flush();
    outFile.fsync();
#endif
 
    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()));
    }
}

test_space()

static void test_space ( skiatest::Reporter *  r, SkColorSpace *  space, const float  red[], const float  green[], const float  blue[], bool  expectSRGB = false  )

static

Definition at line 33 of file ColorSpaceTest.cpp.

                                                {
 
    REPORTER_ASSERT(r, nullptr != space);
    REPORTER_ASSERT(r, expectSRGB == space->gammaCloseToSRGB());
 
    skcms_Matrix3x3 mat;
    space->toXYZD50(&mat);
    const float* ref[3] = { red, green, blue };
    for (int i = 0; i < 3; ++i) {
        REPORTER_ASSERT(r, almost_equal(ref[i][0], mat.vals[0][i]));
        REPORTER_ASSERT(r, almost_equal(ref[i][1], mat.vals[1][i]));
        REPORTER_ASSERT(r, almost_equal(ref[i][2], mat.vals[2][i]));
    }
}

Variable Documentation

g_sRGB_B

constexpr float g_sRGB_B[] { 0.1430f, 0.0606f, 0.7139f }

staticconstexpr

Definition at line 71 of file ColorSpaceTest.cpp.

g_sRGB_G

constexpr float g_sRGB_G[] { 0.3853f, 0.7170f, 0.0971f }

staticconstexpr

Definition at line 70 of file ColorSpaceTest.cpp.

g_sRGB_R

constexpr float g_sRGB_R[] { 0.4358f, 0.2224f, 0.0139f }

staticconstexpr

Definition at line 69 of file ColorSpaceTest.cpp.