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/SkAlphaType.h"
9 #include "include/core/SkColor.h"
10 #include "include/core/SkColorSpace.h"
11 #include "include/core/SkRefCnt.h"
12 #include "modules/skcms/skcms.h"
13 #include "src/core/SkColorSpaceXformSteps.h"
14 #include "tests/Test.h"
15
16 #include <cmath>
17
DEF_TEST(SkColorSpaceXformSteps_vs_skcms,r)18 DEF_TEST(SkColorSpaceXformSteps_vs_skcms, r) {
19 auto srgb = SkColorSpace::MakeSRGB();
20 auto dp3 = SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kDisplayP3);
21
22 skcms_ICCProfile srgb_profile;
23 srgb->toProfile(&srgb_profile);
24 skcms_ICCProfile dp3_profile;
25 dp3->toProfile(&dp3_profile);
26
27 // These colors provide a good spread of interesting test cases.
28 SkColor colors[] = {
29 0xffff0000, 0x7fff0000, 0x7f7f0000,
30 0xff00ff00, 0x7f00ff00, 0x7f007f00,
31 };
32
33 for (auto color : colors) {
34 auto bgra = skcms_PixelFormat_BGRA_8888,
35 f32 = skcms_PixelFormat_RGBA_ffff;
36 auto unpremul = skcms_AlphaFormat_Unpremul,
37 premul = skcms_AlphaFormat_PremulAsEncoded;
38
39 float via_skcms[4];
40 skcms_Transform(&color, bgra, unpremul, &srgb_profile,
41 &via_skcms, f32, premul, &dp3_profile,
42 1);
43
44 SkColorSpaceXformSteps steps(srgb.get(), kUnpremul_SkAlphaType,
45 dp3.get(), kPremul_SkAlphaType);
46 float via_steps[4] = {
47 SkColorGetR(color) * (1 / 255.0f),
48 SkColorGetG(color) * (1 / 255.0f),
49 SkColorGetB(color) * (1 / 255.0f),
50 SkColorGetA(color) * (1 / 255.0f),
51 };
52 steps.apply(via_steps);
53
54 REPORTER_ASSERT(r, fabsf(via_skcms[0] - via_steps[0]) <= 0.005f);
55 REPORTER_ASSERT(r, fabsf(via_skcms[1] - via_steps[1]) <= 0.005f);
56 REPORTER_ASSERT(r, fabsf(via_skcms[2] - via_steps[2]) <= 0.005f);
57 REPORTER_ASSERT(r, fabsf(via_skcms[3] - via_steps[3]) <= 0.0f);
58
59 // Now go back using the other method's inverse transform
60 float steps_to_skcms[4];
61 skcms_Transform(via_steps, f32, premul, &dp3_profile,
62 steps_to_skcms, f32, premul, &srgb_profile,
63 1);
64
65 float skcms_to_steps[4] = { via_skcms[0], via_skcms[1], via_skcms[2], via_skcms[3] };
66 SkColorSpaceXformSteps inv_steps(dp3.get(), kPremul_SkAlphaType,
67 srgb.get(), kPremul_SkAlphaType);
68 inv_steps.apply(skcms_to_steps);
69
70 REPORTER_ASSERT(r, fabsf(skcms_to_steps[0] - steps_to_skcms[0]) <= 0.005f);
71 REPORTER_ASSERT(r, fabsf(skcms_to_steps[1] - steps_to_skcms[1]) <= 0.005f);
72 REPORTER_ASSERT(r, fabsf(skcms_to_steps[2] - steps_to_skcms[2]) <= 0.005f);
73 REPORTER_ASSERT(r, fabsf(skcms_to_steps[3] - steps_to_skcms[3]) <= 0.0f);
74 }
75 }
76