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