| /* |
| * 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 "SkColorPriv.h" |
| #include "SkColorSpace.h" |
| #include "SkColorSpace_Base.h" |
| #include "SkColorSpaceXform.h" |
| #include "Test.h" |
| |
| class ColorSpaceXformTest { |
| public: |
| static std::unique_ptr<SkColorSpaceXform> CreateIdentityXform(const sk_sp<SkGammas>& gammas) { |
| // Logically we can pass any matrix here. For simplicty, pass I(), i.e. D50 XYZ gamut. |
| sk_sp<SkColorSpace> space(new SkColorSpace_Base( |
| nullptr, SkColorSpace::kNonStandard_GammaNamed, gammas, SkMatrix::I(), nullptr)); |
| return SkColorSpaceXform::New(space, space); |
| } |
| }; |
| |
| static bool almost_equal(int x, int y) { |
| return SkTAbs(x - y) <= 1; |
| } |
| |
| static void test_identity_xform(skiatest::Reporter* r, const sk_sp<SkGammas>& gammas) { |
| // Arbitrary set of 10 pixels |
| constexpr int width = 10; |
| constexpr uint32_t srcPixels[width] = { |
| 0xFFABCDEF, 0xFF146829, 0xFF382759, 0xFF184968, 0xFFDE8271, |
| 0xFF32AB52, 0xFF0383BC, 0xFF000102, 0xFFFFFFFF, 0xFFDDEEFF, }; |
| uint32_t dstPixels[width]; |
| |
| // Create and perform an identity xform. |
| std::unique_ptr<SkColorSpaceXform> xform = ColorSpaceXformTest::CreateIdentityXform(gammas); |
| xform->apply(dstPixels, srcPixels, width, kRGBA_8888_SkColorType, kOpaque_SkAlphaType); |
| |
| // Since the src->dst matrix is the identity, and the gamma curves match, |
| // the pixels should be unchanged. |
| for (int i = 0; i < width; i++) { |
| REPORTER_ASSERT(r, almost_equal(((srcPixels[i] >> 0) & 0xFF), |
| ((dstPixels[i] >> 0) & 0xFF))); |
| REPORTER_ASSERT(r, almost_equal(((srcPixels[i] >> 8) & 0xFF), |
| ((dstPixels[i] >> 8) & 0xFF))); |
| REPORTER_ASSERT(r, almost_equal(((srcPixels[i] >> 16) & 0xFF), |
| ((dstPixels[i] >> 16) & 0xFF))); |
| REPORTER_ASSERT(r, almost_equal(((srcPixels[i] >> 24) & 0xFF), |
| ((dstPixels[i] >> 24) & 0xFF))); |
| } |
| } |
| |
| DEF_TEST(ColorSpaceXform_TableGamma, r) { |
| // Lookup-table based gamma curves |
| constexpr size_t tableSize = 10; |
| void* memory = sk_malloc_throw(sizeof(SkGammas) + sizeof(float) * tableSize); |
| sk_sp<SkGammas> gammas = sk_sp<SkGammas>(new (memory) SkGammas()); |
| gammas->fRedType = gammas->fGreenType = gammas->fBlueType = SkGammas::Type::kTable_Type; |
| gammas->fRedData.fTable.fSize = gammas->fGreenData.fTable.fSize = |
| gammas->fBlueData.fTable.fSize = tableSize; |
| gammas->fRedData.fTable.fOffset = gammas->fGreenData.fTable.fOffset = |
| gammas->fBlueData.fTable.fOffset = 0; |
| float* table = SkTAddOffset<float>(memory, sizeof(SkGammas)); |
| |
| table[0] = 0.00f; |
| table[1] = 0.05f; |
| table[2] = 0.10f; |
| table[3] = 0.15f; |
| table[4] = 0.25f; |
| table[5] = 0.35f; |
| table[6] = 0.45f; |
| table[7] = 0.60f; |
| table[8] = 0.75f; |
| table[9] = 1.00f; |
| test_identity_xform(r, gammas); |
| } |
| |
| DEF_TEST(ColorSpaceXform_ParametricGamma, r) { |
| // Parametric gamma curves |
| void* memory = sk_malloc_throw(sizeof(SkGammas) + sizeof(SkGammas::Params)); |
| sk_sp<SkGammas> gammas = sk_sp<SkGammas>(new (memory) SkGammas()); |
| gammas->fRedType = gammas->fGreenType = gammas->fBlueType = SkGammas::Type::kParam_Type; |
| gammas->fRedData.fParamOffset = gammas->fGreenData.fParamOffset = |
| gammas->fBlueData.fParamOffset = 0; |
| SkGammas::Params* params = SkTAddOffset<SkGammas::Params>(memory, sizeof(SkGammas)); |
| |
| // Interval, switch xforms at 0.0031308f |
| params->fD = 0.04045f; |
| |
| // First equation: |
| params->fE = 1.0f / 12.92f; |
| params->fF = 0.0f; |
| |
| // Second equation: |
| // Note that the function is continuous (it's actually sRGB). |
| params->fA = 1.0f / 1.055f; |
| params->fB = 0.055f / 1.055f; |
| params->fC = 0.0f; |
| params->fG = 2.4f; |
| test_identity_xform(r, gammas); |
| } |
| |
| DEF_TEST(ColorSpaceXform_ExponentialGamma, r) { |
| // Exponential gamma curves |
| sk_sp<SkGammas> gammas = sk_sp<SkGammas>(new SkGammas()); |
| gammas->fRedType = gammas->fGreenType = gammas->fBlueType = SkGammas::Type::kValue_Type; |
| gammas->fRedData.fValue = gammas->fGreenData.fValue = gammas->fBlueData.fValue = 1.4f; |
| test_identity_xform(r, gammas); |
| } |
| |
| DEF_TEST(ColorSpaceXform_NonMatchingGamma, r) { |
| constexpr size_t tableSize = 10; |
| void* memory = sk_malloc_throw(sizeof(SkGammas) + sizeof(float) * tableSize + |
| sizeof(SkGammas::Params)); |
| sk_sp<SkGammas> gammas = sk_sp<SkGammas>(new (memory) SkGammas()); |
| |
| float* table = SkTAddOffset<float>(memory, sizeof(SkGammas)); |
| table[0] = 0.00f; |
| table[1] = 0.15f; |
| table[2] = 0.20f; |
| table[3] = 0.25f; |
| table[4] = 0.35f; |
| table[5] = 0.45f; |
| table[6] = 0.55f; |
| table[7] = 0.70f; |
| table[8] = 0.85f; |
| table[9] = 1.00f; |
| |
| SkGammas::Params* params = SkTAddOffset<SkGammas::Params>(memory, sizeof(SkGammas) + |
| sizeof(float) * tableSize); |
| params->fA = 1.0f / 1.055f; |
| params->fB = 0.055f / 1.055f; |
| params->fC = 0.0f; |
| params->fD = 0.04045f; |
| params->fE = 1.0f / 12.92f; |
| params->fF = 0.0f; |
| params->fG = 2.4f; |
| |
| gammas->fRedType = SkGammas::Type::kValue_Type; |
| gammas->fRedData.fValue = 1.2f; |
| |
| gammas->fGreenType = SkGammas::Type::kTable_Type; |
| gammas->fGreenData.fTable.fSize = tableSize; |
| gammas->fGreenData.fTable.fOffset = 0; |
| |
| gammas->fBlueType = SkGammas::Type::kParam_Type; |
| gammas->fBlueData.fParamOffset = sizeof(float) * tableSize; |
| |
| test_identity_xform(r, gammas); |
| } |