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 #pragma once
17 
18 #include <mutex>
19 #include <string>
20 
21 #include "DispSync.h"
22 #include "EventThread.h"
23 
24 namespace android {
25 
26 class DispSyncSource final : public VSyncSource, private DispSync::Callback {
27 public:
28     DispSyncSource(DispSync* dispSync, nsecs_t phaseOffset, nsecs_t offsetThresholdForNextVsync,
29                    bool traceVsync, const char* name);
30 
31     ~DispSyncSource() override = default;
32 
33     // The following methods are implementation of VSyncSource.
34     void setVSyncEnabled(bool enable) override;
35     void setCallback(VSyncSource::Callback* callback) override;
36     void setPhaseOffset(nsecs_t phaseOffset) override;
37 
38 private:
39     // The following method is the implementation of the DispSync::Callback.
40     virtual void onDispSyncEvent(nsecs_t when);
41 
42     void tracePhaseOffset() REQUIRES(mVsyncMutex);
43 
44     const char* const mName;
45     int mValue = 0;
46 
47     const bool mTraceVsync;
48     const std::string mVsyncOnLabel;
49     const std::string mVsyncEventLabel;
50     const std::string mVsyncOffsetLabel;
51     const std::string mVsyncNegativeOffsetLabel;
52     nsecs_t mLastCallbackTime GUARDED_BY(mVsyncMutex) = 0;
53 
54     DispSync* mDispSync;
55 
56     std::mutex mCallbackMutex;
57     VSyncSource::Callback* mCallback GUARDED_BY(mCallbackMutex) = nullptr;
58 
59     std::mutex mVsyncMutex;
60     nsecs_t mPhaseOffset GUARDED_BY(mVsyncMutex);
61     const nsecs_t mOffsetThresholdForNextVsync;
62     bool mEnabled GUARDED_BY(mVsyncMutex) = false;
63 };
64 
65 } // namespace android
66