1 /*
2  * Copyright (c) 2023 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef RS_REALTIME_REFRESH_RATE_MANAGER_H
17 #define RS_REALTIME_REFRESH_RATE_MANAGER_H
18 
19 #include <atomic>
20 #include <chrono>
21 #include <condition_variable>
22 #include <mutex>
23 #include <thread>
24 
25 namespace OHOS::Rosen {
26 class RSRealtimeRefreshRateManager {
27 public:
28     static RSRealtimeRefreshRateManager& Instance();
29 
GetShowRefreshRateEnabled()30     bool GetShowRefreshRateEnabled() const
31     {
32         return enableState_;
33     }
34     void SetShowRefreshRateEnabled(bool enable);
GetRealtimeRefreshRate()35     uint32_t GetRealtimeRefreshRate() const
36     {
37         return currRealtimeRefreshRate_;
38     }
39 private:
40     friend class RSHardwareThread;
41     RSRealtimeRefreshRateManager() = default;
42     ~RSRealtimeRefreshRateManager() = default;
43 
CountRealtimeFrame()44     inline void CountRealtimeFrame()
45     {
46         if (enableState_) {
47             realtimeFrameCount_++;
48         }
49     }
50 
51     std::atomic<bool> enableState_ = false;
52     uint32_t currRealtimeRefreshRate_ = 1;
53     std::atomic<uint32_t> realtimeFrameCount_ = 0;
54 
55     static constexpr uint8_t IDLE_FPS_THRESHOLD_ = 8;
56     static constexpr auto NS_PER_S_ =
57         std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::seconds(1)).count();
58     static constexpr auto NS_FPS_SHOW_INTERVAL_ =
59         std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::milliseconds(250));
60 
61     std::mutex threadMutex_;
62     std::condition_variable threadCondVar_;
63     std::thread updateFpsThread_;
64 };
65 } // namespace OHOS::Rosen
66 #endif // RS_REALTIME_REFRESH_RATE_MANAGER_H
67