1 /*
2 * Copyright 2021 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "ColorSpaces.h"
18
19 namespace android {
20 namespace renderengine {
21 namespace skia {
22
23 // please keep in sync with hwui/utils/Color.cpp
toSkColorSpace(ui::Dataspace dataspace)24 sk_sp<SkColorSpace> toSkColorSpace(ui::Dataspace dataspace) {
25 skcms_Matrix3x3 gamut;
26 switch (dataspace & HAL_DATASPACE_STANDARD_MASK) {
27 case HAL_DATASPACE_STANDARD_BT709:
28 gamut = SkNamedGamut::kSRGB;
29 break;
30 case HAL_DATASPACE_STANDARD_BT2020:
31 gamut = SkNamedGamut::kRec2020;
32 break;
33 case HAL_DATASPACE_STANDARD_DCI_P3:
34 gamut = SkNamedGamut::kDisplayP3;
35 break;
36 case HAL_DATASPACE_STANDARD_ADOBE_RGB:
37 gamut = SkNamedGamut::kAdobeRGB;
38 break;
39 case HAL_DATASPACE_STANDARD_BT601_625:
40 case HAL_DATASPACE_STANDARD_BT601_625_UNADJUSTED:
41 case HAL_DATASPACE_STANDARD_BT601_525:
42 case HAL_DATASPACE_STANDARD_BT601_525_UNADJUSTED:
43 case HAL_DATASPACE_STANDARD_BT2020_CONSTANT_LUMINANCE:
44 case HAL_DATASPACE_STANDARD_BT470M:
45 case HAL_DATASPACE_STANDARD_FILM:
46 case HAL_DATASPACE_STANDARD_UNSPECIFIED:
47 default:
48 gamut = SkNamedGamut::kSRGB;
49 break;
50 }
51
52 switch (dataspace & HAL_DATASPACE_TRANSFER_MASK) {
53 case HAL_DATASPACE_TRANSFER_LINEAR:
54 return SkColorSpace::MakeRGB(SkNamedTransferFn::kLinear, gamut);
55 case HAL_DATASPACE_TRANSFER_SRGB:
56 return SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, gamut);
57 case HAL_DATASPACE_TRANSFER_GAMMA2_2:
58 return SkColorSpace::MakeRGB({2.2f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f}, gamut);
59 case HAL_DATASPACE_TRANSFER_GAMMA2_6:
60 return SkColorSpace::MakeRGB({2.6f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f}, gamut);
61 case HAL_DATASPACE_TRANSFER_GAMMA2_8:
62 return SkColorSpace::MakeRGB({2.8f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f}, gamut);
63 case HAL_DATASPACE_TRANSFER_ST2084:
64 return SkColorSpace::MakeRGB(SkNamedTransferFn::kPQ, gamut);
65 case HAL_DATASPACE_TRANSFER_SMPTE_170M:
66 return SkColorSpace::MakeRGB(SkNamedTransferFn::kRec2020, gamut);
67 case HAL_DATASPACE_TRANSFER_HLG:
68 // return HLG transfer but scale by 1/12
69 skcms_TransferFunction hlgFn;
70 if (skcms_TransferFunction_makeScaledHLGish(&hlgFn, 1.f / 12.f, 2.f, 2.f,
71 1.f / 0.17883277f, 0.28466892f,
72 0.55991073f)) {
73 return SkColorSpace::MakeRGB(hlgFn, gamut);
74 } else {
75 return SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, gamut);
76 }
77 case HAL_DATASPACE_TRANSFER_UNSPECIFIED:
78 default:
79 return SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, gamut);
80 }
81 }
82
83 } // namespace skia
84 } // namespace renderengine
85 } // namespace android