| /* |
| * Copyright (C) 2016 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. |
| */ |
| |
| #ifndef UI_SCALAR_H |
| #define UI_SCALAR_H |
| |
| #include <algorithm> |
| #include <cmath> |
| |
| namespace android { |
| |
| template<typename T> |
| static constexpr T saturate(T v) noexcept { |
| return T(std::min(T(1), std::max(T(0), v))); |
| } |
| |
| template<typename T> |
| static constexpr T clamp(T v, T min, T max) noexcept { |
| return T(std::min(max, std::max(min, v))); |
| } |
| |
| template<typename T> |
| static constexpr T mix(T x, T y, T a) noexcept { |
| return x * (T(1) - a) + y * a; |
| } |
| |
| template<typename T> |
| static constexpr T lerp(T x, T y, T a) noexcept { |
| return mix(x, y, a); |
| } |
| |
| } // namespace std |
| |
| #endif // UI_SCALAR_H |