Mike Klein | c38cce6 | 2017-12-13 11:01:31 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017 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 "../src/jumper/SkJumper.h" |
| 9 | #include "SkColorSpace_New.h" |
| 10 | #include "SkRasterPipeline.h" |
| 11 | #include "Test.h" |
| 12 | #include <initializer_list> |
| 13 | |
| 14 | DEF_TEST(SkColorSpace_New_TransferFnBasics, r) { |
| 15 | auto gamut = SkMatrix44::I(); |
| 16 | auto blending = SkColorSpace_New::Blending::AsEncoded; |
| 17 | |
| 18 | SkColorSpace_New linearA{SkColorSpace_New::TransferFn::MakeLinear(), gamut, blending}, |
| 19 | linearB{SkColorSpace_New::TransferFn::MakeGamma(1), gamut, blending}, |
| 20 | srgb{SkColorSpace_New::TransferFn::MakeSRGB(), gamut, blending}, |
| 21 | gamma{SkColorSpace_New::TransferFn::MakeGamma(2.2f), gamut, blending}; |
| 22 | |
| 23 | REPORTER_ASSERT(r, linearA.gammaIsLinear()); |
| 24 | REPORTER_ASSERT(r, linearB.gammaIsLinear()); |
| 25 | REPORTER_ASSERT(r, ! srgb.gammaIsLinear()); |
| 26 | REPORTER_ASSERT(r, ! gamma.gammaIsLinear()); |
| 27 | |
| 28 | REPORTER_ASSERT(r, !linearA.gammaCloseToSRGB()); |
| 29 | REPORTER_ASSERT(r, !linearB.gammaCloseToSRGB()); |
| 30 | REPORTER_ASSERT(r, srgb.gammaCloseToSRGB()); |
| 31 | REPORTER_ASSERT(r, ! gamma.gammaCloseToSRGB()); |
| 32 | |
| 33 | REPORTER_ASSERT(r, linearA.transferFn().equals(linearB.transferFn())); |
| 34 | REPORTER_ASSERT(r, !linearA.transferFn().equals( srgb.transferFn())); |
| 35 | REPORTER_ASSERT(r, !linearA.transferFn().equals( gamma.transferFn())); |
| 36 | REPORTER_ASSERT(r, !linearB.transferFn().equals( srgb.transferFn())); |
| 37 | REPORTER_ASSERT(r, !linearB.transferFn().equals( gamma.transferFn())); |
| 38 | REPORTER_ASSERT(r, ! srgb.transferFn().equals( gamma.transferFn())); |
| 39 | } |
| 40 | |
| 41 | DEF_TEST(SkColorSpace_New_TransferFnStages, r) { |
| 42 | // We'll create a little SkRasterPipelineBlitter-like scenario, |
| 43 | // blending the same src color over the same dst color, but with |
| 44 | // three different transfer functions, for simplicity the same for src and dst. |
| 45 | SkColor src = 0x7f7f0000; |
| 46 | |
| 47 | SkColor dsts[3]; |
| 48 | for (SkColor& dst : dsts) { |
| 49 | dst = 0xff007f00; |
| 50 | } |
| 51 | |
| 52 | auto gamut = SkMatrix44::I(); |
| 53 | auto blending = SkColorSpace_New::Blending::Linear; |
| 54 | SkColorSpace_New linear{SkColorSpace_New::TransferFn::MakeLinear(), gamut, blending}, |
| 55 | srgb{SkColorSpace_New::TransferFn::MakeSRGB(), gamut, blending}, |
| 56 | gamma{SkColorSpace_New::TransferFn::MakeGamma(3), gamut, blending}; |
| 57 | SkColor* dst = dsts; |
| 58 | for (const SkColorSpace_New* cs : {&linear, &srgb, &gamma}) { |
| 59 | SkJumper_MemoryCtx src_ctx = { &src, 0 }, |
| 60 | dst_ctx = { dst++, 0 }; |
| 61 | |
| 62 | SkRasterPipeline_<256> p; |
| 63 | |
| 64 | p.append(SkRasterPipeline::load_8888, &src_ctx); |
Mike Klein | f1f1162 | 2017-12-18 14:07:31 -0500 | [diff] [blame] | 65 | cs->transferFn().linearizeSrc(&p); |
Mike Klein | c38cce6 | 2017-12-13 11:01:31 -0500 | [diff] [blame] | 66 | p.append(SkRasterPipeline::premul); |
| 67 | |
| 68 | p.append(SkRasterPipeline::load_8888_dst, &dst_ctx); |
Mike Klein | f1f1162 | 2017-12-18 14:07:31 -0500 | [diff] [blame] | 69 | cs->transferFn().linearizeDst(&p); |
Mike Klein | c38cce6 | 2017-12-13 11:01:31 -0500 | [diff] [blame] | 70 | p.append(SkRasterPipeline::premul_dst); |
| 71 | |
| 72 | p.append(SkRasterPipeline::srcover); |
| 73 | p.append(SkRasterPipeline::unpremul); |
| 74 | cs->transferFn().encodeSrc(&p); |
| 75 | p.append(SkRasterPipeline::store_8888, &dst_ctx); |
| 76 | p.run(0,0,1,1); |
| 77 | } |
| 78 | |
| 79 | // Double check the uninteresting channels: alpha's opaque, no blue. |
| 80 | REPORTER_ASSERT(r, SkColorGetA(dsts[0]) == 0xff && SkColorGetB(dsts[0]) == 0x00); |
| 81 | REPORTER_ASSERT(r, SkColorGetA(dsts[1]) == 0xff && SkColorGetB(dsts[1]) == 0x00); |
| 82 | REPORTER_ASSERT(r, SkColorGetA(dsts[2]) == 0xff && SkColorGetB(dsts[2]) == 0x00); |
| 83 | |
| 84 | // Because we're doing linear blending, a more-exponential transfer function will |
| 85 | // brighten the encoded values more when linearizing. So we expect to see that |
| 86 | // linear is darker than sRGB, and sRGB in turn is darker than gamma 3. |
| 87 | REPORTER_ASSERT(r, SkColorGetR(dsts[0]) < SkColorGetR(dsts[1])); |
| 88 | REPORTER_ASSERT(r, SkColorGetR(dsts[1]) < SkColorGetR(dsts[2])); |
| 89 | |
| 90 | REPORTER_ASSERT(r, SkColorGetG(dsts[0]) < SkColorGetG(dsts[1])); |
| 91 | REPORTER_ASSERT(r, SkColorGetG(dsts[1]) < SkColorGetG(dsts[2])); |
| 92 | |
| 93 | } |