msarett | dc27a64 | 2016-06-06 12:02:31 -0700 | [diff] [blame^] | 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(dstPixels[i])); |
| 46 | REPORTER_ASSERT(r, ((srcPixels[i] >> 8) & 0xFF) == SkGetPackedG32(dstPixels[i])); |
| 47 | REPORTER_ASSERT(r, ((srcPixels[i] >> 16) & 0xFF) == SkGetPackedB32(dstPixels[i])); |
| 48 | REPORTER_ASSERT(r, ((srcPixels[i] >> 24) & 0xFF) == SkGetPackedA32(dstPixels[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(blue)); |
| 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(green), 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(blue)); |
| 102 | test_xform(r, gammas); |
| 103 | } |