blob: 784068f1d877c9b509a8183916755502880bfbc2 [file] [log] [blame]
John Reck18f16e62014-05-02 16:46:41 -07001/*
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
18namespace android {
19namespace uirenderer {
20namespace renderthread {
21
John Reck1bcacfd2017-11-03 10:12:19 -070022TimeLord::TimeLord() : mFrameIntervalNanos(milliseconds_to_nanoseconds(16)), mFrameTimeNanos(0) {}
John Reck18f16e62014-05-02 16:46:41 -070023
John Recka733f892014-12-19 11:37:21 -080024bool TimeLord::vsyncReceived(nsecs_t vsync) {
John Reck18f16e62014-05-02 16:46:41 -070025 if (vsync > mFrameTimeNanos) {
26 mFrameTimeNanos = vsync;
John Recka733f892014-12-19 11:37:21 -080027 return true;
John Reck18f16e62014-05-02 16:46:41 -070028 }
John Recka733f892014-12-19 11:37:21 -080029 return false;
John Reck18f16e62014-05-02 16:46:41 -070030}
31
John Reckba6adf62015-02-19 14:36:50 -080032nsecs_t TimeLord::computeFrameTimeNanos() {
John Reck18f16e62014-05-02 16:46:41 -070033 // Logic copied from Choreographer.java
Jerome Gaillarde218c692019-06-14 12:58:57 +010034 nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
John Reck18f16e62014-05-02 16:46:41 -070035 nsecs_t jitterNanos = now - mFrameTimeNanos;
36 if (jitterNanos >= mFrameIntervalNanos) {
37 nsecs_t lastFrameOffset = jitterNanos % mFrameIntervalNanos;
38 mFrameTimeNanos = now - lastFrameOffset;
39 }
John Reckba6adf62015-02-19 14:36:50 -080040 return mFrameTimeNanos;
41}
42
John Reck18f16e62014-05-02 16:46:41 -070043} /* namespace renderthread */
44} /* namespace uirenderer */
45} /* namespace android */