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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "TimeLord.h"
namespace android {
namespace uirenderer {
namespace renderthread {
TimeLord::TimeLord()
: mFrameIntervalNanos(milliseconds_to_nanoseconds(16))
, mFrameTimeNanos(0) {
}
bool TimeLord::vsyncReceived(nsecs_t vsync) {
if (vsync > mFrameTimeNanos) {
mFrameTimeNanos = vsync;
return true;
}
return false;
}
nsecs_t TimeLord::computeFrameTimeNanos() {
// Logic copied from Choreographer.java
nsecs_t now = systemTime(CLOCK_MONOTONIC);
nsecs_t jitterNanos = now - mFrameTimeNanos;
if (jitterNanos >= mFrameIntervalNanos) {
nsecs_t lastFrameOffset = jitterNanos % mFrameIntervalNanos;
mFrameTimeNanos = now - lastFrameOffset;
}
return mFrameTimeNanos;
}
nsecs_t TimeLord::computeFrameTimeMs() {
return nanoseconds_to_milliseconds(computeFrameTimeNanos());
}
} /* namespace renderthread */
} /* namespace uirenderer */
} /* namespace android */
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