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/*
* Copyright 2016 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 ANDROID_GUI_OCCUPANCYTRACKER_H
#define ANDROID_GUI_OCCUPANCYTRACKER_H
#include <binder/Parcelable.h>
#include <utils/Timers.h>
#include <deque>
#include <unordered_map>
namespace android {
class String8;
class OccupancyTracker
{
public:
OccupancyTracker()
: mPendingSegment(),
mSegmentHistory(),
mLastOccupancy(0),
mLastOccupancyChangeTime(0) {}
struct Segment : public Parcelable {
Segment()
: totalTime(0),
numFrames(0),
occupancyAverage(0.0f),
usedThirdBuffer(false) {}
Segment(nsecs_t totalTime, size_t numFrames, float occupancyAverage,
bool usedThirdBuffer)
: totalTime(totalTime),
numFrames(numFrames),
occupancyAverage(occupancyAverage),
usedThirdBuffer(usedThirdBuffer) {}
// Parcelable interface
virtual status_t writeToParcel(Parcel* parcel) const override;
virtual status_t readFromParcel(const Parcel* parcel) override;
nsecs_t totalTime;
size_t numFrames;
// Average occupancy of the queue over this segment. (0.0, 1.0) implies
// double-buffered, (1.0, 2.0) implies triple-buffered.
float occupancyAverage;
// Whether a third buffer was used at all during this segment (since a
// segment could read as double-buffered on average, but still require a
// third buffer to avoid jank for some smaller portion)
bool usedThirdBuffer;
};
void registerOccupancyChange(size_t occupancy);
std::vector<Segment> getSegmentHistory(bool forceFlush);
private:
static constexpr size_t MAX_HISTORY_SIZE = 10;
static constexpr nsecs_t NEW_SEGMENT_DELAY = ms2ns(100);
static constexpr size_t LONG_SEGMENT_THRESHOLD = 3;
struct PendingSegment {
void clear() {
totalTime = 0;
numFrames = 0;
mOccupancyTimes.clear();
}
nsecs_t totalTime;
size_t numFrames;
std::unordered_map<size_t, nsecs_t> mOccupancyTimes;
};
void recordPendingSegment();
PendingSegment mPendingSegment;
std::deque<Segment> mSegmentHistory;
size_t mLastOccupancy;
nsecs_t mLastOccupancyChangeTime;
}; // class OccupancyTracker
} // namespace android
#endif