1 /* 2 * Copyright 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <array> 20 #include <cinttypes> 21 #include <cstdint> 22 #include <numeric> 23 #include <string> 24 #include <unordered_map> 25 26 #include <utils/Timers.h> 27 28 #include "LayerInfo.h" 29 #include "SchedulerUtils.h" 30 31 namespace android { 32 namespace scheduler { 33 34 /* 35 * This class represents information about layers that are considered current. We keep an 36 * unordered map between layer name and LayerInfo. 37 */ 38 class LayerHistory { 39 public: 40 // Handle for each layer we keep track of. 41 class LayerHandle { 42 public: 43 LayerHandle(LayerHistory& lh, int64_t id) : mId(id), mLayerHistory(lh) {} 44 ~LayerHandle() { mLayerHistory.destroyLayer(mId); } 45 46 const int64_t mId; 47 48 private: 49 LayerHistory& mLayerHistory; 50 }; 51 52 LayerHistory(); 53 ~LayerHistory(); 54 55 // When the layer is first created, register it. 56 std::unique_ptr<LayerHandle> createLayer(const std::string name, float maxRefreshRate); 57 58 // Method for inserting layers and their requested present time into the unordered map. 59 void insert(const std::unique_ptr<LayerHandle>& layerHandle, nsecs_t presentTime, bool isHdr); 60 // Method for setting layer visibility 61 void setVisibility(const std::unique_ptr<LayerHandle>& layerHandle, bool visible); 62 63 // Returns the desired refresh rate, which is a max refresh rate of all the current 64 // layers. See go/content-fps-detection-in-scheduler for more information. 65 std::pair<float, bool> getDesiredRefreshRateAndHDR(); 66 67 // Removes the handle and the object from the map. 68 void destroyLayer(const int64_t id); 69 70 private: 71 // Removes the layers that have been idle for a given amount of time from mLayerInfos. 72 void removeIrrelevantLayers() REQUIRES(mLock); 73 74 // Information about currently active layers. 75 std::mutex mLock; 76 std::unordered_map<int64_t, std::shared_ptr<LayerInfo>> mActiveLayerInfos GUARDED_BY(mLock); 77 std::unordered_map<int64_t, std::shared_ptr<LayerInfo>> mInactiveLayerInfos GUARDED_BY(mLock); 78 79 // Each layer has it's own ID. This variable keeps track of the count. 80 static std::atomic<int64_t> sNextId; 81 82 // Flag whether to log layer FPS in systrace 83 bool mTraceEnabled = false; 84 }; 85 86 } // namespace scheduler 87 } // namespace android
