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| 1 /* |
| 2 * Copyright 2016 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "Resources.h" |
| 9 #include "SkCodec.h" |
| 10 #include "SkColorPriv.h" |
| 11 #include "SkColorSpace.h" |
| 12 #include "SkColorSpace_Base.h" |
| 13 #include "SkColorSpaceXform.h" |
| 14 #include "Test.h" |
| 15 |
| 16 class ColorSpaceXformTest { |
| 17 public: |
| 18 static SkDefaultXform* CreateDefaultXform(const sk_sp<SkGammas>& srcGamma, |
| 19 const SkMatrix44& srcToDst, const sk_sp<SkGammas>& dstGamma) { |
| 20 return new SkDefaultXform(srcGamma, srcToDst, dstGamma); |
| 21 } |
| 22 }; |
| 23 |
| 24 static void test_xform(skiatest::Reporter* r, const sk_sp<SkGammas>& gammas) { |
| 25 // Arbitrary set of 10 pixels |
| 26 constexpr int width = 10; |
| 27 constexpr uint32_t srcPixels[width] = { |
| 28 0xFFABCDEF, 0xFF146829, 0xFF382759, 0xFF184968, 0xFFDE8271, |
| 29 0xFF32AB52, 0xFF0383BC, 0xFF000000, 0xFFFFFFFF, 0xFFDDEEFF, }; |
| 30 uint32_t dstPixels[width]; |
| 31 |
| 32 // Identity matrix |
| 33 SkMatrix44 srcToDst = SkMatrix44::I(); |
| 34 |
| 35 // Create and perform xform |
| 36 std::unique_ptr<SkColorSpaceXform> xform( |
| 37 ColorSpaceXformTest::CreateDefaultXform(gammas, srcToDst, gammas)); |
| 38 xform->xform_RGBA_8888(dstPixels, srcPixels, width); |
| 39 |
| 40 // Since the matrix is the identity, and the gamma curves match, the pixels |
| 41 // should be unchanged. |
| 42 for (int i = 0; i < width; i++) { |
| 43 // TODO (msarett): |
| 44 // As the implementation changes, we may want to use a tolerance here. |
| 45 REPORTER_ASSERT(r, ((srcPixels[i] >> 0) & 0xFF) == SkGetPackedR32(dstPi
xels[i])); |
| 46 REPORTER_ASSERT(r, ((srcPixels[i] >> 8) & 0xFF) == SkGetPackedG32(dstPi
xels[i])); |
| 47 REPORTER_ASSERT(r, ((srcPixels[i] >> 16) & 0xFF) == SkGetPackedB32(dstPi
xels[i])); |
| 48 REPORTER_ASSERT(r, ((srcPixels[i] >> 24) & 0xFF) == SkGetPackedA32(dstPi
xels[i])); |
| 49 } |
| 50 } |
| 51 |
| 52 DEF_TEST(ColorSpaceXform_TableGamma, r) { |
| 53 // Lookup-table based gamma curves |
| 54 SkGammaCurve red, green, blue; |
| 55 constexpr size_t tableSize = 10; |
| 56 red.fTable = std::unique_ptr<float[]>(new float[tableSize]); |
| 57 green.fTable = std::unique_ptr<float[]>(new float[tableSize]); |
| 58 blue.fTable = std::unique_ptr<float[]>(new float[tableSize]); |
| 59 red.fTableSize = green.fTableSize = blue.fTableSize = 10; |
| 60 red.fTable[0] = green.fTable[0] = blue.fTable[0] = 0.00f; |
| 61 red.fTable[1] = green.fTable[1] = blue.fTable[1] = 0.05f; |
| 62 red.fTable[2] = green.fTable[2] = blue.fTable[2] = 0.10f; |
| 63 red.fTable[3] = green.fTable[3] = blue.fTable[3] = 0.15f; |
| 64 red.fTable[4] = green.fTable[4] = blue.fTable[4] = 0.25f; |
| 65 red.fTable[5] = green.fTable[5] = blue.fTable[5] = 0.35f; |
| 66 red.fTable[6] = green.fTable[6] = blue.fTable[6] = 0.45f; |
| 67 red.fTable[7] = green.fTable[7] = blue.fTable[7] = 0.60f; |
| 68 red.fTable[8] = green.fTable[8] = blue.fTable[8] = 0.75f; |
| 69 red.fTable[9] = green.fTable[9] = blue.fTable[9] = 1.00f; |
| 70 sk_sp<SkGammas> gammas = |
| 71 sk_make_sp<SkGammas>(std::move(red), std::move(green), std::move(blu
e)); |
| 72 test_xform(r, gammas); |
| 73 } |
| 74 |
| 75 DEF_TEST(ColorSpaceXform_ParametricGamma, r) { |
| 76 // Parametric gamma curves |
| 77 SkGammaCurve red, green, blue; |
| 78 |
| 79 // Interval, switch xforms at 0.5f |
| 80 red.fD = green.fD = blue.fD = 0.5f; |
| 81 |
| 82 // First equation, Y = 0.5f * X |
| 83 red.fE = green.fE = blue.fE = 0.5f; |
| 84 |
| 85 // Second equation, Y = ((1.0f * X) + 0.0f) ^ 3.0f + 0.125f |
| 86 // Note that the function is continuous: |
| 87 // 0.5f * 0.5f = ((1.0f * 0.5f) + 0.0f) ^ 3.0f + 0.125f = 0.25f |
| 88 red.fA = green.fA = blue.fA = 1.0f; |
| 89 red.fB = green.fB = blue.fB = 0.0f; |
| 90 red.fC = green.fC = blue.fC = 0.125f; |
| 91 red.fG = green.fG = blue.fG = 3.0f; |
| 92 sk_sp<SkGammas> gammas = sk_make_sp<SkGammas>(std::move(red), std::move(gree
n), std::move(blue)); |
| 93 test_xform(r, gammas); |
| 94 } |
| 95 |
| 96 DEF_TEST(ColorSpaceXform_ExponentialGamma, r) { |
| 97 // Exponential gamma curves |
| 98 SkGammaCurve red, green, blue; |
| 99 red.fValue = green.fValue = blue.fValue = 4.0f; |
| 100 sk_sp<SkGammas> gammas = |
| 101 sk_make_sp<SkGammas>(std::move(red), std::move(green), std::move(blu
e)); |
| 102 test_xform(r, gammas); |
| 103 } |
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