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89 lines
2.9 KiB
89 lines
2.9 KiB
4 months ago
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/*
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* Copyright 2019 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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#pragma once
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#include <utils/Timers.h>
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#include "Fps.h"
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#include "VSyncDispatch.h"
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namespace android::scheduler {
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/*
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* VSyncTracker is an interface for providing estimates on future Vsync signal times based on
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* historical vsync timing data.
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*/
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class VSyncTracker {
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public:
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virtual ~VSyncTracker();
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/*
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* Adds a known timestamp from a vsync timing source (HWVsync signal, present fence)
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* to the model.
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*
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* \param [in] timestamp The timestamp when the vsync signal was.
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* \return True if the timestamp was consistent with the internal model,
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* False otherwise
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*/
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virtual bool addVsyncTimestamp(nsecs_t timestamp) = 0;
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/*
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* Access the next anticipated vsync time such that the anticipated time >= timePoint.
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* This will always give the best accurate at the time of calling; multiple
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* calls with the same timePoint might give differing values if the internal model
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* is updated.
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*
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* \param [in] timePoint The point in time after which to estimate a vsync event.
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* \return A prediction of the timestamp of a vsync event.
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*/
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virtual nsecs_t nextAnticipatedVSyncTimeFrom(nsecs_t timePoint) const = 0;
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/*
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* The current period of the vsync signal.
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*
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* \return The current period of the vsync signal
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*/
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virtual nsecs_t currentPeriod() const = 0;
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/*
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* Inform the tracker that the period is changing and the tracker needs to recalibrate itself.
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*
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* \param [in] period The period that the system is changing into.
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*/
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virtual void setPeriod(nsecs_t period) = 0;
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/* Inform the tracker that the samples it has are not accurate for prediction. */
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virtual void resetModel() = 0;
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virtual bool needsMoreSamples() const = 0;
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/*
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* Checks if a vsync timestamp is in phase for a frame rate
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*
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* \param [in] timePoint A vsync timestamp
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* \param [in] frameRate The frame rate to check for
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*/
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virtual bool isVSyncInPhase(nsecs_t timePoint, Fps frameRate) const = 0;
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virtual void dump(std::string& result) const = 0;
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protected:
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VSyncTracker(VSyncTracker const&) = delete;
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VSyncTracker& operator=(VSyncTracker const&) = delete;
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VSyncTracker() = default;
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};
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} // namespace android::scheduler
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