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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.
*/
#ifndef TIMELORD_H
#define TIMELORD_H
#include <utils/Timers.h>
namespace android {
namespace uirenderer {
namespace renderthread {
class RenderThread;
// This class serves as a helper to filter & manage frame times from multiple sources
// ensuring that time flows linearly and smoothly
class TimeLord {
public:
void setFrameInterval(nsecs_t intervalNanos) { mFrameIntervalNanos = intervalNanos; }
nsecs_t frameIntervalNanos() const { return mFrameIntervalNanos; }
// returns true if the vsync is newer, false if it was rejected for staleness
bool vsyncReceived(nsecs_t vsync);
nsecs_t latestVsync() { return mFrameTimeNanos; }
nsecs_t computeFrameTimeMs();
nsecs_t computeFrameTimeNanos();
private:
friend class RenderThread;
TimeLord();
~TimeLord() {}
nsecs_t mFrameIntervalNanos;
nsecs_t mFrameTimeNanos;
};
} /* namespace renderthread */
} /* namespace uirenderer */
} /* namespace android */
#endif /* TIMELORD_H */
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