| // Copyright 2018 The Fuchsia 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 SRC_GRAPHICS_DISPLAY_TESTING_UTILS_H_ |
| #define SRC_GRAPHICS_DISPLAY_TESTING_UTILS_H_ |
| |
| #include <inttypes.h> |
| |
| static inline uint32_t interpolate(uint32_t max, int32_t cur_frame, int32_t period) { |
| float fraction = ((float)(cur_frame % period)) / ((float)period - 1); |
| fraction = (cur_frame / period) % 2 ? 1.0f - fraction : fraction; |
| return (uint32_t)((float)max * fraction); |
| } |
| |
| #endif // SRC_GRAPHICS_DISPLAY_TESTING_UTILS_H_ |
