501ff9acfe
Fixes: 29072773 By using computeFrameTime AnimationContext would potentially end up modifying the latest vsync if a very-slow frame was received from the UI thread. This could potentially desync animations that were RT & UI thread 'synchronized', but more significantly it would confuse the swap chain which tries to only draw one frame per vsync causing unneccessary frame drops. Change-Id: Ibd2ec3157ce32fee1eec8d56837c45a35e622895
54 lines
1.5 KiB
C++
54 lines
1.5 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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#ifndef TIMELORD_H
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#define TIMELORD_H
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#include <utils/Timers.h>
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namespace android {
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namespace uirenderer {
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namespace renderthread {
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class RenderThread;
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// This class serves as a helper to filter & manage frame times from multiple sources
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// ensuring that time flows linearly and smoothly
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class TimeLord {
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public:
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void setFrameInterval(nsecs_t intervalNanos) { mFrameIntervalNanos = intervalNanos; }
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nsecs_t frameIntervalNanos() const { return mFrameIntervalNanos; }
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// returns true if the vsync is newer, false if it was rejected for staleness
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bool vsyncReceived(nsecs_t vsync);
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nsecs_t latestVsync() { return mFrameTimeNanos; }
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nsecs_t computeFrameTimeNanos();
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private:
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friend class RenderThread;
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TimeLord();
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~TimeLord() {}
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nsecs_t mFrameIntervalNanos;
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nsecs_t 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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#endif /* TIMELORD_H */
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