| /* |
| * Copyright (C) 2019 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. |
| */ |
| #pragma once |
| |
| #include <ui/ColorSpace.h> |
| |
| namespace android { |
| |
| namespace { |
| |
| struct Color { |
| uint8_t r; |
| uint8_t g; |
| uint8_t b; |
| uint8_t a; |
| |
| static const Color RED; |
| static const Color GREEN; |
| static const Color BLUE; |
| static const Color WHITE; |
| static const Color BLACK; |
| static const Color TRANSPARENT; |
| }; |
| |
| const Color Color::RED{255, 0, 0, 255}; |
| const Color Color::GREEN{0, 255, 0, 255}; |
| const Color Color::BLUE{0, 0, 255, 255}; |
| const Color Color::WHITE{255, 255, 255, 255}; |
| const Color Color::BLACK{0, 0, 0, 255}; |
| const Color Color::TRANSPARENT{0, 0, 0, 0}; |
| |
| class ColorTransformHelper { |
| public: |
| static void DegammaColorSingle(half& s) { |
| if (s <= 0.03928f) |
| s = s / 12.92f; |
| else |
| s = pow((s + 0.055f) / 1.055f, 2.4f); |
| } |
| |
| static void DegammaColor(half3& color) { |
| DegammaColorSingle(color.r); |
| DegammaColorSingle(color.g); |
| DegammaColorSingle(color.b); |
| } |
| |
| static void GammaColorSingle(half& s) { |
| if (s <= 0.0031308f) { |
| s = s * 12.92f; |
| } else { |
| s = 1.055f * pow(s, (1.0f / 2.4f)) - 0.055f; |
| } |
| } |
| |
| static void GammaColor(half3& color) { |
| GammaColorSingle(color.r); |
| GammaColorSingle(color.g); |
| GammaColorSingle(color.b); |
| } |
| |
| static void applyMatrix(half3& color, const mat3& mat) { |
| half3 ret = half3(0); |
| |
| for (int i = 0; i < 3; i++) { |
| for (int j = 0; j < 3; j++) { |
| ret[i] = ret[i] + color[j] * mat[j][i]; |
| } |
| } |
| color = ret; |
| } |
| }; |
| } // namespace |
| } // namespace android |