1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "Color.h"
#include <utils/Log.h>
#include <ui/ColorSpace.h>
#include <algorithm>
#include <cmath>
namespace android {
namespace uirenderer {
android::PixelFormat ColorTypeToPixelFormat(SkColorType colorType) {
switch (colorType) {
case kRGBA_8888_SkColorType:
return PIXEL_FORMAT_RGBA_8888;
case kRGBA_F16_SkColorType:
return PIXEL_FORMAT_RGBA_FP16;
case kRGB_565_SkColorType:
return PIXEL_FORMAT_RGB_565;
case kRGB_888x_SkColorType:
return PIXEL_FORMAT_RGBX_8888;
case kRGBA_1010102_SkColorType:
return PIXEL_FORMAT_RGBA_1010102;
case kARGB_4444_SkColorType:
return PIXEL_FORMAT_RGBA_4444;
default:
ALOGV("Unsupported colorType: %d, return RGBA_8888 by default", (int)colorType);
return PIXEL_FORMAT_RGBA_8888;
}
}
SkColorType PixelFormatToColorType(android::PixelFormat format) {
switch (format) {
case PIXEL_FORMAT_RGBX_8888: return kRGB_888x_SkColorType;
case PIXEL_FORMAT_RGBA_8888: return kRGBA_8888_SkColorType;
case PIXEL_FORMAT_RGBA_FP16: return kRGBA_F16_SkColorType;
case PIXEL_FORMAT_RGB_565: return kRGB_565_SkColorType;
case PIXEL_FORMAT_RGBA_1010102: return kRGBA_1010102_SkColorType;
case PIXEL_FORMAT_RGBA_4444: return kARGB_4444_SkColorType;
default:
ALOGV("Unsupported PixelFormat: %d, return kUnknown_SkColorType by default", format);
return kUnknown_SkColorType;
}
}
sk_sp<SkColorSpace> DataSpaceToColorSpace(android_dataspace dataspace) {
if (dataspace == HAL_DATASPACE_UNKNOWN) {
return SkColorSpace::MakeSRGB();
}
skcms_Matrix3x3 gamut;
switch (dataspace & HAL_DATASPACE_STANDARD_MASK) {
case HAL_DATASPACE_STANDARD_BT709:
gamut = SkNamedGamut::kSRGB;
break;
case HAL_DATASPACE_STANDARD_BT2020:
gamut = SkNamedGamut::kRec2020;
break;
case HAL_DATASPACE_STANDARD_DCI_P3:
gamut = SkNamedGamut::kDCIP3;
break;
case HAL_DATASPACE_STANDARD_ADOBE_RGB:
gamut = SkNamedGamut::kAdobeRGB;
break;
case HAL_DATASPACE_STANDARD_UNSPECIFIED:
return nullptr;
case HAL_DATASPACE_STANDARD_BT601_625:
case HAL_DATASPACE_STANDARD_BT601_625_UNADJUSTED:
case HAL_DATASPACE_STANDARD_BT601_525:
case HAL_DATASPACE_STANDARD_BT601_525_UNADJUSTED:
case HAL_DATASPACE_STANDARD_BT2020_CONSTANT_LUMINANCE:
case HAL_DATASPACE_STANDARD_BT470M:
case HAL_DATASPACE_STANDARD_FILM:
default:
ALOGV("Unsupported Gamut: %d", dataspace);
return nullptr;
}
switch (dataspace & HAL_DATASPACE_TRANSFER_MASK) {
case HAL_DATASPACE_TRANSFER_LINEAR:
return SkColorSpace::MakeRGB(SkNamedTransferFn::kLinear, gamut);
case HAL_DATASPACE_TRANSFER_SRGB:
return SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, gamut);
case HAL_DATASPACE_TRANSFER_GAMMA2_2:
return SkColorSpace::MakeRGB({2.2f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f}, gamut);
case HAL_DATASPACE_TRANSFER_GAMMA2_6:
return SkColorSpace::MakeRGB({2.6f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f}, gamut);
case HAL_DATASPACE_TRANSFER_GAMMA2_8:
return SkColorSpace::MakeRGB({2.8f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f}, gamut);
case HAL_DATASPACE_TRANSFER_UNSPECIFIED:
return nullptr;
case HAL_DATASPACE_TRANSFER_SMPTE_170M:
case HAL_DATASPACE_TRANSFER_ST2084:
case HAL_DATASPACE_TRANSFER_HLG:
default:
ALOGV("Unsupported Gamma: %d", dataspace);
return nullptr;
}
}
template<typename T>
static constexpr T clamp(T x, T min, T max) {
return x < min ? min : x > max ? max : x;
}
//static const float2 ILLUMINANT_D50_XY = {0.34567f, 0.35850f};
static const float3 ILLUMINANT_D50_XYZ = {0.964212f, 1.0f, 0.825188f};
static const mat3 BRADFORD = mat3{
float3{ 0.8951f, -0.7502f, 0.0389f},
float3{ 0.2664f, 1.7135f, -0.0685f},
float3{-0.1614f, 0.0367f, 1.0296f}
};
static mat3 adaptation(const mat3& matrix, const float3& srcWhitePoint, const float3& dstWhitePoint) {
float3 srcLMS = matrix * srcWhitePoint;
float3 dstLMS = matrix * dstWhitePoint;
return inverse(matrix) * mat3{dstLMS / srcLMS} * matrix;
}
namespace LabColorSpace {
static constexpr float A = 216.0f / 24389.0f;
static constexpr float B = 841.0f / 108.0f;
static constexpr float C = 4.0f / 29.0f;
static constexpr float D = 6.0f / 29.0f;
float3 toXyz(const Lab& lab) {
float3 v { lab.L, lab.a, lab.b };
v[0] = clamp(v[0], 0.0f, 100.0f);
v[1] = clamp(v[1], -128.0f, 128.0f);
v[2] = clamp(v[2], -128.0f, 128.0f);
float fy = (v[0] + 16.0f) / 116.0f;
float fx = fy + (v[1] * 0.002f);
float fz = fy - (v[2] * 0.005f);
float X = fx > D ? fx * fx * fx : (1.0f / B) * (fx - C);
float Y = fy > D ? fy * fy * fy : (1.0f / B) * (fy - C);
float Z = fz > D ? fz * fz * fz : (1.0f / B) * (fz - C);
v[0] = X * ILLUMINANT_D50_XYZ[0];
v[1] = Y * ILLUMINANT_D50_XYZ[1];
v[2] = Z * ILLUMINANT_D50_XYZ[2];
return v;
}
Lab fromXyz(const float3& v) {
float X = v[0] / ILLUMINANT_D50_XYZ[0];
float Y = v[1] / ILLUMINANT_D50_XYZ[1];
float Z = v[2] / ILLUMINANT_D50_XYZ[2];
float fx = X > A ? pow(X, 1.0f / 3.0f) : B * X + C;
float fy = Y > A ? pow(Y, 1.0f / 3.0f) : B * Y + C;
float fz = Z > A ? pow(Z, 1.0f / 3.0f) : B * Z + C;
float L = 116.0f * fy - 16.0f;
float a = 500.0f * (fx - fy);
float b = 200.0f * (fy - fz);
return Lab {
clamp(L, 0.0f, 100.0f),
clamp(a, -128.0f, 128.0f),
clamp(b, -128.0f, 128.0f)
};
}
};
Lab sRGBToLab(SkColor color) {
auto colorSpace = ColorSpace::sRGB();
float3 rgb;
rgb.r = SkColorGetR(color) / 255.0f;
rgb.g = SkColorGetG(color) / 255.0f;
rgb.b = SkColorGetB(color) / 255.0f;
float3 xyz = colorSpace.rgbToXYZ(rgb);
float3 srcXYZ = ColorSpace::XYZ(float3{colorSpace.getWhitePoint(), 1});
xyz = adaptation(BRADFORD, srcXYZ, ILLUMINANT_D50_XYZ) * xyz;
return LabColorSpace::fromXyz(xyz);
}
SkColor LabToSRGB(const Lab& lab, SkAlpha alpha) {
auto colorSpace = ColorSpace::sRGB();
float3 xyz = LabColorSpace::toXyz(lab);
float3 dstXYZ = ColorSpace::XYZ(float3{colorSpace.getWhitePoint(), 1});
xyz = adaptation(BRADFORD, ILLUMINANT_D50_XYZ, dstXYZ) * xyz;
float3 rgb = colorSpace.xyzToRGB(xyz);
return SkColorSetARGB(alpha,
static_cast<uint8_t>(rgb.r * 255),
static_cast<uint8_t>(rgb.g * 255),
static_cast<uint8_t>(rgb.b * 255));
}
} // namespace uirenderer
} // namespace android
|
