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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 "../third_party/skcms/skcms.h"
#include "SkColorSpace.h"
#include "SkColorSpaceXformSteps.h"
#include "Test.h"
DEF_TEST(SkColorSpaceXformSteps_vs_skcms, r) {
auto srgb = SkColorSpace::MakeSRGB();
auto dp3 = SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma,
SkColorSpace::kDCIP3_D65_Gamut);
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());
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());
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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