John Reck | 18f16e6 | 2014-05-02 16:46:41 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 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 | #include "TimeLord.h" |
| 17 | |
| 18 | namespace android { |
| 19 | namespace uirenderer { |
| 20 | namespace renderthread { |
| 21 | |
John Reck | 1bcacfd | 2017-11-03 10:12:19 -0700 | [diff] [blame] | 22 | TimeLord::TimeLord() : mFrameIntervalNanos(milliseconds_to_nanoseconds(16)), mFrameTimeNanos(0) {} |
John Reck | 18f16e6 | 2014-05-02 16:46:41 -0700 | [diff] [blame] | 23 | |
John Reck | a733f89 | 2014-12-19 11:37:21 -0800 | [diff] [blame] | 24 | bool TimeLord::vsyncReceived(nsecs_t vsync) { |
John Reck | 18f16e6 | 2014-05-02 16:46:41 -0700 | [diff] [blame] | 25 | if (vsync > mFrameTimeNanos) { |
| 26 | mFrameTimeNanos = vsync; |
John Reck | a733f89 | 2014-12-19 11:37:21 -0800 | [diff] [blame] | 27 | return true; |
John Reck | 18f16e6 | 2014-05-02 16:46:41 -0700 | [diff] [blame] | 28 | } |
John Reck | a733f89 | 2014-12-19 11:37:21 -0800 | [diff] [blame] | 29 | return false; |
John Reck | 18f16e6 | 2014-05-02 16:46:41 -0700 | [diff] [blame] | 30 | } |
| 31 | |
John Reck | ba6adf6 | 2015-02-19 14:36:50 -0800 | [diff] [blame] | 32 | nsecs_t TimeLord::computeFrameTimeNanos() { |
John Reck | 18f16e6 | 2014-05-02 16:46:41 -0700 | [diff] [blame] | 33 | // Logic copied from Choreographer.java |
Jerome Gaillard | e218c69 | 2019-06-14 12:58:57 +0100 | [diff] [blame] | 34 | nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC); |
John Reck | 18f16e6 | 2014-05-02 16:46:41 -0700 | [diff] [blame] | 35 | nsecs_t jitterNanos = now - mFrameTimeNanos; |
| 36 | if (jitterNanos >= mFrameIntervalNanos) { |
| 37 | nsecs_t lastFrameOffset = jitterNanos % mFrameIntervalNanos; |
| 38 | mFrameTimeNanos = now - lastFrameOffset; |
| 39 | } |
John Reck | ba6adf6 | 2015-02-19 14:36:50 -0800 | [diff] [blame] | 40 | return mFrameTimeNanos; |
| 41 | } |
| 42 | |
John Reck | 18f16e6 | 2014-05-02 16:46:41 -0700 | [diff] [blame] | 43 | } /* namespace renderthread */ |
| 44 | } /* namespace uirenderer */ |
| 45 | } /* namespace android */ |