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- /*
- * 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 "include/core/SkColorSpace.h"
- #include "include/third_party/skcms/skcms.h"
- #include "src/core/SkColorSpaceXformSteps.h"
- #include "tests/Test.h"
- DEF_TEST(SkColorSpaceXformSteps_vs_skcms, r) {
- auto srgb = SkColorSpace::MakeSRGB();
- auto dp3 = SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kDCIP3);
- skcms_ICCProfile srgb_profile;
- srgb->toProfile(&srgb_profile);
- skcms_ICCProfile dp3_profile;
- dp3->toProfile(&dp3_profile);
- // These colors provide a good spread of interesting test cases.
- SkColor colors[] = {
- 0xffff0000, 0x7fff0000, 0x7f7f0000,
- 0xff00ff00, 0x7f00ff00, 0x7f007f00,
- };
- for (auto color : colors) {
- auto bgra = skcms_PixelFormat_BGRA_8888,
- f32 = skcms_PixelFormat_RGBA_ffff;
- auto unpremul = skcms_AlphaFormat_Unpremul,
- premul = skcms_AlphaFormat_PremulAsEncoded;
- float via_skcms[4];
- skcms_Transform(&color, bgra, unpremul, &srgb_profile,
- &via_skcms, f32, premul, &dp3_profile,
- 1);
- SkColorSpaceXformSteps steps(srgb.get(), kUnpremul_SkAlphaType,
- dp3.get(), kPremul_SkAlphaType);
- float via_steps[4] = {
- SkColorGetR(color) * (1 / 255.0f),
- SkColorGetG(color) * (1 / 255.0f),
- SkColorGetB(color) * (1 / 255.0f),
- SkColorGetA(color) * (1 / 255.0f),
- };
- steps.apply(via_steps);
- REPORTER_ASSERT(r, fabsf(via_skcms[0] - via_steps[0]) <= 0.005f);
- REPORTER_ASSERT(r, fabsf(via_skcms[1] - via_steps[1]) <= 0.005f);
- REPORTER_ASSERT(r, fabsf(via_skcms[2] - via_steps[2]) <= 0.005f);
- REPORTER_ASSERT(r, fabsf(via_skcms[3] - via_steps[3]) <= 0.0f);
- // Now go back using the other method's inverse transform
- float steps_to_skcms[4];
- skcms_Transform(via_steps, f32, premul, &dp3_profile,
- steps_to_skcms, f32, premul, &srgb_profile,
- 1);
- float skcms_to_steps[4] = { via_skcms[0], via_skcms[1], via_skcms[2], via_skcms[3] };
- SkColorSpaceXformSteps inv_steps(dp3.get(), kPremul_SkAlphaType,
- srgb.get(), kPremul_SkAlphaType);
- inv_steps.apply(skcms_to_steps);
- REPORTER_ASSERT(r, fabsf(skcms_to_steps[0] - steps_to_skcms[0]) <= 0.005f);
- REPORTER_ASSERT(r, fabsf(skcms_to_steps[1] - steps_to_skcms[1]) <= 0.005f);
- REPORTER_ASSERT(r, fabsf(skcms_to_steps[2] - steps_to_skcms[2]) <= 0.005f);
- REPORTER_ASSERT(r, fabsf(skcms_to_steps[3] - steps_to_skcms[3]) <= 0.0f);
- }
- }
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