1 /*
2 * Copyright 2018 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 "include/core/SkColorSpace.h"
9 #include "include/third_party/skcms/skcms.h"
10 #include "src/core/SkColorSpaceXformSteps.h"
11 #include "tests/Test.h"
12
DEF_TEST(SkColorSpaceXformSteps_vs_skcms,r)13 DEF_TEST(SkColorSpaceXformSteps_vs_skcms, r) {
14 auto srgb = SkColorSpace::MakeSRGB();
15 auto dp3 = SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kDisplayP3);
16
17 skcms_ICCProfile srgb_profile;
18 srgb->toProfile(&srgb_profile);
19 skcms_ICCProfile dp3_profile;
20 dp3->toProfile(&dp3_profile);
21
22 // These colors provide a good spread of interesting test cases.
23 SkColor colors[] = {
24 0xffff0000, 0x7fff0000, 0x7f7f0000,
25 0xff00ff00, 0x7f00ff00, 0x7f007f00,
26 };
27
28 for (auto color : colors) {
29 auto bgra = skcms_PixelFormat_BGRA_8888,
30 f32 = skcms_PixelFormat_RGBA_ffff;
31 auto unpremul = skcms_AlphaFormat_Unpremul,
32 premul = skcms_AlphaFormat_PremulAsEncoded;
33
34 float via_skcms[4];
35 skcms_Transform(&color, bgra, unpremul, &srgb_profile,
36 &via_skcms, f32, premul, &dp3_profile,
37 1);
38
39 SkColorSpaceXformSteps steps(srgb.get(), kUnpremul_SkAlphaType,
40 dp3.get(), kPremul_SkAlphaType);
41 float via_steps[4] = {
42 SkColorGetR(color) * (1 / 255.0f),
43 SkColorGetG(color) * (1 / 255.0f),
44 SkColorGetB(color) * (1 / 255.0f),
45 SkColorGetA(color) * (1 / 255.0f),
46 };
47 steps.apply(via_steps);
48
49 REPORTER_ASSERT(r, fabsf(via_skcms[0] - via_steps[0]) <= 0.005f);
50 REPORTER_ASSERT(r, fabsf(via_skcms[1] - via_steps[1]) <= 0.005f);
51 REPORTER_ASSERT(r, fabsf(via_skcms[2] - via_steps[2]) <= 0.005f);
52 REPORTER_ASSERT(r, fabsf(via_skcms[3] - via_steps[3]) <= 0.0f);
53
54 // Now go back using the other method's inverse transform
55 float steps_to_skcms[4];
56 skcms_Transform(via_steps, f32, premul, &dp3_profile,
57 steps_to_skcms, f32, premul, &srgb_profile,
58 1);
59
60 float skcms_to_steps[4] = { via_skcms[0], via_skcms[1], via_skcms[2], via_skcms[3] };
61 SkColorSpaceXformSteps inv_steps(dp3.get(), kPremul_SkAlphaType,
62 srgb.get(), kPremul_SkAlphaType);
63 inv_steps.apply(skcms_to_steps);
64
65 REPORTER_ASSERT(r, fabsf(skcms_to_steps[0] - steps_to_skcms[0]) <= 0.005f);
66 REPORTER_ASSERT(r, fabsf(skcms_to_steps[1] - steps_to_skcms[1]) <= 0.005f);
67 REPORTER_ASSERT(r, fabsf(skcms_to_steps[2] - steps_to_skcms[2]) <= 0.005f);
68 REPORTER_ASSERT(r, fabsf(skcms_to_steps[3] - steps_to_skcms[3]) <= 0.0f);
69 }
70 }
71