| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/core/SkColorSpacePriv.h" |
| #include "src/core/SkColorSpaceXformSteps.h" |
| #include "tests/Test.h" |
| |
| DEF_TEST(SkColorSpaceXformSteps, r) { |
| auto srgb = SkColorSpace::MakeSRGB(), |
| adobe = SkColorSpace::MakeRGB(SkNamedTransferFn::k2Dot2, SkNamedGamut::kAdobeRGB), |
| srgb22 = SkColorSpace::MakeRGB(SkNamedTransferFn::k2Dot2, SkNamedGamut::kSRGB), |
| srgb1 = srgb ->makeLinearGamma(), |
| adobe1 = adobe->makeLinearGamma(); |
| |
| auto premul = kPremul_SkAlphaType, |
| opaque = kOpaque_SkAlphaType, |
| unpremul = kUnpremul_SkAlphaType; |
| |
| struct { |
| sk_sp<SkColorSpace> src, dst; |
| SkAlphaType srcAT, dstAT; |
| |
| bool unpremul; |
| bool linearize; |
| bool gamut_transform; |
| bool encode; |
| bool premul; |
| |
| } tests[] = { |
| // The general case is converting between two color spaces with different gamuts |
| // and different transfer functions. There's no optimization possible here. |
| { adobe, srgb, premul, premul, |
| true, // src is encoded as f(s)*a,a, so we unpremul to f(s),a before linearizing. |
| true, // linearize to s,a |
| true, // transform s to dst gamut, s' |
| true, // encode with dst transfer function, g(s'), a |
| true, // premul to g(s')*a, a |
| }, |
| // All the same going the other direction. |
| { srgb, adobe, premul, premul, true,true,true,true,true }, |
| |
| // If the src alpha type is unpremul, we'll not need that initial unpremul step. |
| { adobe, srgb, unpremul, premul, false,true,true,true,true }, |
| { srgb, adobe, unpremul, premul, false,true,true,true,true }, |
| |
| // If opaque, we need neither the initial unpremul, nor the premul later. |
| { adobe, srgb, opaque, premul, false,true,true,true,false }, |
| { srgb, adobe, opaque, premul, false,true,true,true,false }, |
| |
| |
| // Now let's go between sRGB and sRGB with a 2.2 gamma, the gamut staying the same. |
| { srgb, srgb22, premul, premul, |
| true, // we need to linearize, so we need to unpremul |
| true, // we need to encode to 2.2 gamma, so we need to get linear |
| false, // no need to change gamut |
| true, // linear -> gamma 2.2 |
| true, // premul going into the blend |
| }, |
| // Same sort of logic in the other direction. |
| { srgb22, srgb, premul, premul, true,true,false,true,true }, |
| |
| // As in the general case, when we change the alpha type unpremul and premul steps drop out. |
| { srgb, srgb22, unpremul, premul, false,true,false,true,true }, |
| { srgb22, srgb, unpremul, premul, false,true,false,true,true }, |
| { srgb, srgb22, opaque, premul, false,true,false,true,false }, |
| { srgb22, srgb, opaque, premul, false,true,false,true,false }, |
| |
| // Let's look at the special case of completely matching color spaces. |
| // We should be ready to go into the blend without any fuss. |
| { srgb, srgb, premul, premul, false,false,false,false,false }, |
| { srgb, srgb, unpremul, premul, false,false,false,false,true }, |
| { srgb, srgb, opaque, premul, false,false,false,false,false }, |
| |
| // We can drop out the linearize step when the source is already linear. |
| { srgb1, adobe, premul, premul, true,false,true,true,true }, |
| { srgb1, srgb, premul, premul, true,false,false,true,true }, |
| // And we can drop the encode step when the destination is linear. |
| { adobe, srgb1, premul, premul, true,true,true,false,true }, |
| { srgb, srgb1, premul, premul, true,true,false,false,true }, |
| |
| // Here's an interesting case where only gamut transform is needed. |
| { adobe1, srgb1, premul, premul, false,false,true,false,false }, |
| { adobe1, srgb1, opaque, premul, false,false,true,false,false }, |
| { adobe1, srgb1, unpremul, premul, false,false,true,false, true }, |
| |
| // Just finishing up with something to produce each other possible output. |
| // Nothing terribly interesting in these eight. |
| { srgb, srgb1, opaque, premul, false, true,false,false,false }, |
| { srgb, srgb1, unpremul, premul, false, true,false,false, true }, |
| { srgb, adobe1, opaque, premul, false, true, true,false,false }, |
| { srgb, adobe1, unpremul, premul, false, true, true,false, true }, |
| { srgb1, srgb, opaque, premul, false,false,false, true,false }, |
| { srgb1, srgb, unpremul, premul, false,false,false, true, true }, |
| { srgb1, adobe, opaque, premul, false,false, true, true,false }, |
| { srgb1, adobe, unpremul, premul, false,false, true, true, true }, |
| |
| // Now test non-premul outputs. |
| { srgb , srgb , premul, unpremul, true,false,false,false,false }, |
| { srgb , srgb1 , premul, unpremul, true, true,false,false,false }, |
| { srgb1, adobe1, premul, unpremul, true,false, true,false,false }, |
| { srgb , adobe1, premul, unpremul, true, true, true,false,false }, |
| { srgb1, srgb , premul, unpremul, true,false,false, true,false }, |
| { srgb , srgb22, premul, unpremul, true, true,false, true,false }, |
| { srgb1, adobe , premul, unpremul, true,false, true, true,false }, |
| { srgb , adobe , premul, unpremul, true, true, true, true,false }, |
| |
| // Opaque outputs are treated as the same alpha type as the source input. |
| // TODO: we'd really like to have a good way of explaining why we think this is useful. |
| { srgb , srgb , premul, opaque, false,false,false,false,false }, |
| { srgb , srgb1 , premul, opaque, true, true,false,false, true }, |
| { srgb1, adobe1, premul, opaque, false,false, true,false,false }, |
| { srgb , adobe1, premul, opaque, true, true, true,false, true }, |
| { srgb1, srgb , premul, opaque, true,false,false, true, true }, |
| { srgb , srgb22, premul, opaque, true, true,false, true, true }, |
| { srgb1, adobe , premul, opaque, true,false, true, true, true }, |
| { srgb , adobe , premul, opaque, true, true, true, true, true }, |
| |
| { srgb , srgb , unpremul, opaque, false,false,false,false,false }, |
| { srgb , srgb1 , unpremul, opaque, false, true,false,false,false }, |
| { srgb1, adobe1, unpremul, opaque, false,false, true,false,false }, |
| { srgb , adobe1, unpremul, opaque, false, true, true,false,false }, |
| { srgb1, srgb , unpremul, opaque, false,false,false, true,false }, |
| { srgb , srgb22, unpremul, opaque, false, true,false, true,false }, |
| { srgb1, adobe , unpremul, opaque, false,false, true, true,false }, |
| { srgb , adobe , unpremul, opaque, false, true, true, true,false }, |
| }; |
| |
| uint32_t tested = 0x00000000; |
| for (auto t : tests) { |
| SkColorSpaceXformSteps steps{t.src.get(), t.srcAT, |
| t.dst.get(), t.dstAT}; |
| REPORTER_ASSERT(r, steps.flags.unpremul == t.unpremul); |
| REPORTER_ASSERT(r, steps.flags.linearize == t.linearize); |
| REPORTER_ASSERT(r, steps.flags.gamut_transform == t.gamut_transform); |
| REPORTER_ASSERT(r, steps.flags.encode == t.encode); |
| REPORTER_ASSERT(r, steps.flags.premul == t.premul); |
| |
| uint32_t bits = (uint32_t)t.unpremul << 0 |
| | (uint32_t)t.linearize << 1 |
| | (uint32_t)t.gamut_transform << 2 |
| | (uint32_t)t.encode << 3 |
| | (uint32_t)t.premul << 4; |
| tested |= (1<<bits); |
| } |
| |
| // We'll check our test cases cover all 2^5 == 32 possible outputs. |
| for (uint32_t t = 0; t < 32; t++) { |
| if (tested & (1<<t)) { |
| continue; |
| } |
| |
| // There are a couple impossible outputs, so consider those bits tested. |
| // |
| // Unpremul then premul should be optimized away to a noop, so 0b10001 isn't possible. |
| // A gamut transform in the middle is fine too, so 0b10101 isn't possible either. |
| if (t == 0b10001 || t == 0b10101) { |
| continue; |
| } |
| |
| ERRORF(r, "{ xxx, yyy, at, %s,%s,%s,%s,%s }, not covered", |
| (t& 1) ? " true" : "false", |
| (t& 2) ? " true" : "false", |
| (t& 4) ? " true" : "false", |
| (t& 8) ? " true" : "false", |
| (t&16) ? " true" : "false"); |
| } |
| } |
