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      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()
     23         : mFrameIntervalNanos(0)
     24         , mFrameTimeNanos(0) {
     25 }
     26 
     27 void TimeLord::vsyncReceived(nsecs_t vsync) {
     28     if (vsync > mFrameTimeNanos) {
     29         mFrameTimeNanos = vsync;
     30     }
     31 }
     32 
     33 nsecs_t TimeLord::computeFrameTimeMs() {
     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 */
     47