| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UI_ANDROID_ANIMATION_UTILS_H_ |
| #define UI_ANDROID_ANIMATION_UTILS_H_ |
| |
| namespace ui { |
| |
| template <typename T> |
| T Lerp(T a, T b, T t) { |
| return a + (b - a) * t; |
| } |
| |
| template <typename T> |
| T Clamp(T value, T low, T high) { |
| return value < low ? low : (value > high ? high : value); |
| } |
| |
| template <typename T> |
| T Damp(T input, T factor) { |
| T result; |
| if (factor == 1) { |
| result = 1 - (1 - input) * (1 - input); |
| } else { |
| result = 1 - std::pow(1 - input, 2 * factor); |
| } |
| return result; |
| } |
| |
| } // namespace ui |
| |
| #endif // UI_ANDROID_ANIMATION_UTILS_H_ |