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/*
* Copyright 2018 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.
*/
#pragma once
#include <array>
#include <cinttypes>
#include <cstdint>
#include <numeric>
#include <string>
#include <unordered_map>
#include <utils/Timers.h>
#include "LayerInfo.h"
#include "SchedulerUtils.h"
namespace android {
namespace scheduler {
/*
* This class represents information about layers that are considered current. We keep an
* unordered map between layer name and LayerInfo.
*/
class LayerHistory {
public:
// Handle for each layer we keep track of.
class LayerHandle {
public:
LayerHandle(LayerHistory& lh, int64_t id) : mId(id), mLayerHistory(lh) {}
~LayerHandle() { mLayerHistory.destroyLayer(mId); }
const int64_t mId;
private:
LayerHistory& mLayerHistory;
};
LayerHistory();
~LayerHistory();
// When the layer is first created, register it.
std::unique_ptr<LayerHandle> createLayer(const std::string name, float minRefreshRate,
float maxRefreshRate);
// Method for inserting layers and their requested present time into the unordered map.
void insert(const std::unique_ptr<LayerHandle>& layerHandle, nsecs_t presentTime, bool isHdr);
// Method for setting layer visibility
void setVisibility(const std::unique_ptr<LayerHandle>& layerHandle, bool visible);
// Returns the desired refresh rate, which is a max refresh rate of all the current
// layers. See go/content-fps-detection-in-scheduler for more information.
std::pair<float, bool> getDesiredRefreshRateAndHDR();
// Clears all layer history.
void clearHistory();
// Removes the handle and the object from the map.
void destroyLayer(const int64_t id);
private:
// Removes the layers that have been idle for a given amount of time from mLayerInfos.
void removeIrrelevantLayers() REQUIRES(mLock);
// Information about currently active layers.
std::mutex mLock;
std::unordered_map<int64_t, std::shared_ptr<LayerInfo>> mActiveLayerInfos GUARDED_BY(mLock);
std::unordered_map<int64_t, std::shared_ptr<LayerInfo>> mInactiveLayerInfos GUARDED_BY(mLock);
// Each layer has it's own ID. This variable keeps track of the count.
static std::atomic<int64_t> sNextId;
// Flag whether to log layer FPS in systrace
bool mTraceEnabled = false;
};
} // namespace scheduler
} // namespace android
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