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 | |
| 22 | TimeLord::TimeLord() |
John Reck | 2615de9 | 2014-10-21 10:09:36 -0700 | [diff] [blame] | 23 | : mFrameIntervalNanos(milliseconds_to_nanoseconds(16)) |
John Reck | 18f16e6 | 2014-05-02 16:46:41 -0700 | [diff] [blame] | 24 | , mFrameTimeNanos(0) { |
| 25 | } |
| 26 | |
| 27 | void TimeLord::vsyncReceived(nsecs_t vsync) { |
| 28 | if (vsync > mFrameTimeNanos) { |
| 29 | mFrameTimeNanos = vsync; |
| 30 | } |
| 31 | } |
| 32 | |
John Reck | 119907c | 2014-08-14 09:02:01 -0700 | [diff] [blame] | 33 | nsecs_t TimeLord::computeFrameTimeMs() { |
John Reck | 18f16e6 | 2014-05-02 16:46:41 -0700 | [diff] [blame] | 34 | // Logic copied from Choreographer.java |
| 35 | nsecs_t now = systemTime(CLOCK_MONOTONIC); |
| 36 | nsecs_t jitterNanos = now - mFrameTimeNanos; |
| 37 | if (jitterNanos >= mFrameIntervalNanos) { |
| 38 | nsecs_t lastFrameOffset = jitterNanos % mFrameIntervalNanos; |
| 39 | mFrameTimeNanos = now - lastFrameOffset; |
| 40 | } |
| 41 | return nanoseconds_to_milliseconds(mFrameTimeNanos); |
| 42 | } |
| 43 | |
| 44 | } /* namespace renderthread */ |
| 45 | } /* namespace uirenderer */ |
| 46 | } /* namespace android */ |