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1 /*
2  * Copyright (C) 2015 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 #ifndef ANDROID_EVENT_WORKER_H_
18 #define ANDROID_EVENT_WORKER_H_
19 
20 #include "drmdevice.h"
21 #include "worker.h"
22 
23 #include <stdint.h>
24 #include <map>
25 
26 #include <hardware/hardware.h>
27 #include <hardware/hwcomposer.h>
28 
29 namespace android {
30 
31 class VsyncCallback {
32  public:
~VsyncCallback()33   virtual ~VsyncCallback() {
34   }
35   virtual void Callback(int display, int64_t timestamp) = 0;
36 };
37 
38 class VSyncWorker : public Worker {
39  public:
40   VSyncWorker();
41   ~VSyncWorker() override;
42 
43   int Init(DrmDevice *drm, int display);
44   void RegisterCallback(std::shared_ptr<VsyncCallback> callback);
45 
46   void VSyncControl(bool enabled);
47 
48  protected:
49   void Routine() override;
50 
51  private:
52   int64_t GetPhasedVSync(int64_t frame_ns, int64_t current);
53   int SyntheticWaitVBlank(int64_t *timestamp);
54 
55   DrmDevice *drm_;
56 
57   // shared_ptr since we need to use this outside of the thread lock (to
58   // actually call the hook) and we don't want the memory freed until we're
59   // done
60   std::shared_ptr<VsyncCallback> callback_ = NULL;
61 
62   int display_;
63   std::atomic_bool enabled_;
64   int64_t last_timestamp_;
65 };
66 }  // namespace android
67 
68 #endif
69