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71 lines
2.8 KiB
71 lines
2.8 KiB
4 months ago
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/*
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* Copyright 2018 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "include/core/SkColorSpace.h"
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#include "include/third_party/skcms/skcms.h"
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#include "src/core/SkColorSpaceXformSteps.h"
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#include "tests/Test.h"
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DEF_TEST(SkColorSpaceXformSteps_vs_skcms, r) {
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auto srgb = SkColorSpace::MakeSRGB();
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auto dp3 = SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kDisplayP3);
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skcms_ICCProfile srgb_profile;
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srgb->toProfile(&srgb_profile);
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skcms_ICCProfile dp3_profile;
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dp3->toProfile(&dp3_profile);
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// These colors provide a good spread of interesting test cases.
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SkColor colors[] = {
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0xffff0000, 0x7fff0000, 0x7f7f0000,
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0xff00ff00, 0x7f00ff00, 0x7f007f00,
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};
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for (auto color : colors) {
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auto bgra = skcms_PixelFormat_BGRA_8888,
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f32 = skcms_PixelFormat_RGBA_ffff;
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auto unpremul = skcms_AlphaFormat_Unpremul,
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premul = skcms_AlphaFormat_PremulAsEncoded;
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float via_skcms[4];
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skcms_Transform(&color, bgra, unpremul, &srgb_profile,
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&via_skcms, f32, premul, &dp3_profile,
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1);
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SkColorSpaceXformSteps steps(srgb.get(), kUnpremul_SkAlphaType,
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dp3.get(), kPremul_SkAlphaType);
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float via_steps[4] = {
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SkColorGetR(color) * (1 / 255.0f),
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SkColorGetG(color) * (1 / 255.0f),
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SkColorGetB(color) * (1 / 255.0f),
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SkColorGetA(color) * (1 / 255.0f),
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};
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steps.apply(via_steps);
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REPORTER_ASSERT(r, fabsf(via_skcms[0] - via_steps[0]) <= 0.005f);
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REPORTER_ASSERT(r, fabsf(via_skcms[1] - via_steps[1]) <= 0.005f);
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REPORTER_ASSERT(r, fabsf(via_skcms[2] - via_steps[2]) <= 0.005f);
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REPORTER_ASSERT(r, fabsf(via_skcms[3] - via_steps[3]) <= 0.0f);
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// Now go back using the other method's inverse transform
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float steps_to_skcms[4];
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skcms_Transform(via_steps, f32, premul, &dp3_profile,
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steps_to_skcms, f32, premul, &srgb_profile,
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1);
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float skcms_to_steps[4] = { via_skcms[0], via_skcms[1], via_skcms[2], via_skcms[3] };
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SkColorSpaceXformSteps inv_steps(dp3.get(), kPremul_SkAlphaType,
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srgb.get(), kPremul_SkAlphaType);
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inv_steps.apply(skcms_to_steps);
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REPORTER_ASSERT(r, fabsf(skcms_to_steps[0] - steps_to_skcms[0]) <= 0.005f);
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REPORTER_ASSERT(r, fabsf(skcms_to_steps[1] - steps_to_skcms[1]) <= 0.005f);
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REPORTER_ASSERT(r, fabsf(skcms_to_steps[2] - steps_to_skcms[2]) <= 0.005f);
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REPORTER_ASSERT(r, fabsf(skcms_to_steps[3] - steps_to_skcms[3]) <= 0.0f);
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}
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}
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