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Diffstat (limited to 'tests/ColorSpaceXformTest.cpp')
-rw-r--r-- | tests/ColorSpaceXformTest.cpp | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/tests/ColorSpaceXformTest.cpp b/tests/ColorSpaceXformTest.cpp new file mode 100644 index 0000000000..220509b9f6 --- /dev/null +++ b/tests/ColorSpaceXformTest.cpp @@ -0,0 +1,103 @@ +/* + * 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 SkDefaultXform* CreateDefaultXform(const sk_sp<SkGammas>& srcGamma, + const SkMatrix44& srcToDst, const sk_sp<SkGammas>& dstGamma) { + return new SkDefaultXform(srcGamma, srcToDst, dstGamma); + } +}; + +static void test_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, 0xFF000000, 0xFFFFFFFF, 0xFFDDEEFF, }; + uint32_t dstPixels[width]; + + // Identity matrix + SkMatrix44 srcToDst = SkMatrix44::I(); + + // Create and perform xform + std::unique_ptr<SkColorSpaceXform> xform( + ColorSpaceXformTest::CreateDefaultXform(gammas, srcToDst, gammas)); + xform->xform_RGBA_8888(dstPixels, srcPixels, width); + + // Since the matrix is the identity, and the gamma curves match, the pixels + // should be unchanged. + for (int i = 0; i < width; i++) { + // TODO (msarett): + // As the implementation changes, we may want to use a tolerance here. + REPORTER_ASSERT(r, ((srcPixels[i] >> 0) & 0xFF) == SkGetPackedR32(dstPixels[i])); + REPORTER_ASSERT(r, ((srcPixels[i] >> 8) & 0xFF) == SkGetPackedG32(dstPixels[i])); + REPORTER_ASSERT(r, ((srcPixels[i] >> 16) & 0xFF) == SkGetPackedB32(dstPixels[i])); + REPORTER_ASSERT(r, ((srcPixels[i] >> 24) & 0xFF) == SkGetPackedA32(dstPixels[i])); + } +} + +DEF_TEST(ColorSpaceXform_TableGamma, r) { + // Lookup-table based gamma curves + SkGammaCurve red, green, blue; + constexpr size_t tableSize = 10; + red.fTable = std::unique_ptr<float[]>(new float[tableSize]); + green.fTable = std::unique_ptr<float[]>(new float[tableSize]); + blue.fTable = std::unique_ptr<float[]>(new float[tableSize]); + red.fTableSize = green.fTableSize = blue.fTableSize = 10; + red.fTable[0] = green.fTable[0] = blue.fTable[0] = 0.00f; + red.fTable[1] = green.fTable[1] = blue.fTable[1] = 0.05f; + red.fTable[2] = green.fTable[2] = blue.fTable[2] = 0.10f; + red.fTable[3] = green.fTable[3] = blue.fTable[3] = 0.15f; + red.fTable[4] = green.fTable[4] = blue.fTable[4] = 0.25f; + red.fTable[5] = green.fTable[5] = blue.fTable[5] = 0.35f; + red.fTable[6] = green.fTable[6] = blue.fTable[6] = 0.45f; + red.fTable[7] = green.fTable[7] = blue.fTable[7] = 0.60f; + red.fTable[8] = green.fTable[8] = blue.fTable[8] = 0.75f; + red.fTable[9] = green.fTable[9] = blue.fTable[9] = 1.00f; + sk_sp<SkGammas> gammas = + sk_make_sp<SkGammas>(std::move(red), std::move(green), std::move(blue)); + test_xform(r, gammas); +} + +DEF_TEST(ColorSpaceXform_ParametricGamma, r) { + // Parametric gamma curves + SkGammaCurve red, green, blue; + + // Interval, switch xforms at 0.5f + red.fD = green.fD = blue.fD = 0.5f; + + // First equation, Y = 0.5f * X + red.fE = green.fE = blue.fE = 0.5f; + + // Second equation, Y = ((1.0f * X) + 0.0f) ^ 3.0f + 0.125f + // Note that the function is continuous: + // 0.5f * 0.5f = ((1.0f * 0.5f) + 0.0f) ^ 3.0f + 0.125f = 0.25f + red.fA = green.fA = blue.fA = 1.0f; + red.fB = green.fB = blue.fB = 0.0f; + red.fC = green.fC = blue.fC = 0.125f; + red.fG = green.fG = blue.fG = 3.0f; + sk_sp<SkGammas> gammas = sk_make_sp<SkGammas>(std::move(red), std::move(green), std::move(blue)); + test_xform(r, gammas); +} + +DEF_TEST(ColorSpaceXform_ExponentialGamma, r) { + // Exponential gamma curves + SkGammaCurve red, green, blue; + red.fValue = green.fValue = blue.fValue = 4.0f; + sk_sp<SkGammas> gammas = + sk_make_sp<SkGammas>(std::move(red), std::move(green), std::move(blue)); + test_xform(r, gammas); +} |