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 #include <gui/DisplayEventReceiver.h>
18 #include <utils/Log.h>
19 #include <utils/Looper.h>
20 
21 namespace android {
22 
23 class DisplayEventDispatcher : public LooperCallback {
24 public:
25     explicit DisplayEventDispatcher(const sp<Looper>& looper,
26             ISurfaceComposer::VsyncSource vsyncSource = ISurfaceComposer::eVsyncSourceApp,
27             ISurfaceComposer::ConfigChanged configChanged = ISurfaceComposer::eConfigChangedSuppress);
28 
29     status_t initialize();
30     void dispose();
31     status_t scheduleVsync();
32 
33 protected:
34     virtual ~DisplayEventDispatcher() = default;
35 
36 private:
37     sp<Looper> mLooper;
38     DisplayEventReceiver mReceiver;
39     bool mWaitingForVsync;
40 
41     virtual void dispatchVsync(nsecs_t timestamp, PhysicalDisplayId displayId, uint32_t count) = 0;
42     virtual void dispatchHotplug(nsecs_t timestamp, PhysicalDisplayId displayId,
43                                  bool connected) = 0;
44     virtual void dispatchConfigChanged(nsecs_t timestamp, PhysicalDisplayId displayId,
45                                        int32_t configId) = 0;
46 
47     virtual int handleEvent(int receiveFd, int events, void* data);
48     bool processPendingEvents(nsecs_t* outTimestamp, PhysicalDisplayId* outDisplayId,
49                               uint32_t* outCount);
50 };
51 }
52