1/*
2 * Copyright (C) 2015 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#ifndef COLOR_H
17#define COLOR_H
18
19#include <math.h>
20#include <system/graphics.h>
21
22#include <SkColor.h>
23#include <SkColorSpace.h>
24
25namespace android {
26namespace uirenderer {
27namespace Color {
28enum Color {
29    Red_500 = 0xFFF44336,
30    Pink_500 = 0xFFE91E63,
31    Purple_500 = 0xFF9C27B0,
32    DeepPurple_500 = 0xFF673AB7,
33    Indigo_500 = 0xFF3F51B5,
34    Blue_500 = 0xFF2196F3,
35    LightBlue_300 = 0xFF4FC3F7,
36    LightBlue_500 = 0xFF03A9F4,
37    Cyan_500 = 0xFF00BCD4,
38    Teal_500 = 0xFF008577,
39    Teal_700 = 0xFF00796B,
40    Green_500 = 0xFF4CAF50,
41    Green_700 = 0xFF388E3C,
42    LightGreen_500 = 0xFF8BC34A,
43    LightGreen_700 = 0xFF689F38,
44    Lime_500 = 0xFFCDDC39,
45    Yellow_500 = 0xFFFFEB3B,
46    Amber_500 = 0xFFFFC107,
47    Orange_500 = 0xFFFF9800,
48    DeepOrange_500 = 0xFFFF5722,
49    Brown_500 = 0xFF795548,
50    Grey_200 = 0xFFEEEEEE,
51    Grey_500 = 0xFF9E9E9E,
52    Grey_700 = 0xFF616161,
53    BlueGrey_500 = 0xFF607D8B,
54    Transparent = 0x00000000,
55    Black = 0xFF000000,
56    White = 0xFFFFFFFF,
57};
58}
59
60static_assert(Color::White == SK_ColorWHITE, "color format has changed");
61static_assert(Color::Black == SK_ColorBLACK, "color format has changed");
62
63// Array of bright (500 intensity) colors for synthetic content
64static const Color::Color BrightColors[] = {
65        Color::Red_500,    Color::Pink_500,  Color::Purple_500,     Color::DeepPurple_500,
66        Color::Indigo_500, Color::Blue_500,  Color::LightBlue_500,  Color::Cyan_500,
67        Color::Teal_500,   Color::Green_500, Color::LightGreen_500, Color::Lime_500,
68        Color::Yellow_500, Color::Amber_500, Color::Orange_500,     Color::DeepOrange_500,
69        Color::Brown_500,  Color::Grey_500,  Color::BlueGrey_500,
70};
71static constexpr int BrightColorsCount = sizeof(BrightColors) / sizeof(Color::Color);
72
73enum class TransferFunctionType : int8_t { None = 0, Full, Limited, Gamma };
74
75// Opto-electronic conversion function for the sRGB color space
76// Takes a linear sRGB value and converts it to a gamma-encoded sRGB value
77static constexpr float OECF_sRGB(float linear) {
78    // IEC 61966-2-1:1999
79    return linear <= 0.0031308f ? linear * 12.92f : (powf(linear, 1.0f / 2.4f) * 1.055f) - 0.055f;
80}
81
82// Opto-electronic conversion function for the sRGB color space
83// Takes a linear sRGB value and converts it to a gamma-encoded sRGB value
84// This function returns the input unmodified if linear blending is not enabled
85static constexpr float OECF(float linear) {
86#ifdef ANDROID_ENABLE_LINEAR_BLENDING
87    return OECF_sRGB(linear);
88#else
89    return linear;
90#endif
91}
92
93// Electro-optical conversion function for the sRGB color space
94// Takes a gamma-encoded sRGB value and converts it to a linear sRGB value
95static constexpr float EOCF_sRGB(float srgb) {
96    // IEC 61966-2-1:1999
97    return srgb <= 0.04045f ? srgb / 12.92f : powf((srgb + 0.055f) / 1.055f, 2.4f);
98}
99
100// Electro-optical conversion function for the sRGB color space
101// Takes a gamma-encoded sRGB value and converts it to a linear sRGB value
102// This function returns the input unmodified if linear blending is not enabled
103static constexpr float EOCF(float srgb) {
104#ifdef ANDROID_ENABLE_LINEAR_BLENDING
105    return EOCF_sRGB(srgb);
106#else
107    return srgb;
108#endif
109}
110
111// Returns whether the specified color space's transfer function can be
112// approximated with the native sRGB transfer function. This method
113// returns true for sRGB, gamma 2.2 and Display P3 for instance
114bool transferFunctionCloseToSRGB(const SkColorSpace* colorSpace);
115
116sk_sp<SkColorSpace> DataSpaceToColorSpace(android_dataspace dataspace);
117} /* namespace uirenderer */
118} /* namespace android */
119
120#endif /* COLOR_H */
121