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      1 /*
      2  * Copyright (C) 2011 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_SURFACE_FLINGER_EVENT_THREAD_H
     18 #define ANDROID_SURFACE_FLINGER_EVENT_THREAD_H
     19 
     20 #include <stdint.h>
     21 #include <sys/types.h>
     22 
     23 #include <gui/DisplayEventReceiver.h>
     24 #include <gui/IDisplayEventConnection.h>
     25 
     26 #include <hardware/hwcomposer_defs.h>
     27 
     28 #include <utils/Errors.h>
     29 #include <utils/threads.h>
     30 #include <utils/SortedVector.h>
     31 
     32 #include "DisplayHardware/PowerHAL.h"
     33 
     34 // ---------------------------------------------------------------------------
     35 namespace android {
     36 // ---------------------------------------------------------------------------
     37 
     38 class SurfaceFlinger;
     39 class String8;
     40 
     41 // ---------------------------------------------------------------------------
     42 
     43 class EventThread : public Thread {
     44     class Connection : public BnDisplayEventConnection {
     45     public:
     46         Connection(const sp<EventThread>& eventThread);
     47         status_t postEvent(const DisplayEventReceiver::Event& event);
     48 
     49         // count >= 1 : continuous event. count is the vsync rate
     50         // count == 0 : one-shot event that has not fired
     51         // count ==-1 : one-shot event that fired this round / disabled
     52         int32_t count;
     53 
     54     private:
     55         virtual ~Connection();
     56         virtual void onFirstRef();
     57         virtual sp<BitTube> getDataChannel() const;
     58         virtual void setVsyncRate(uint32_t count);
     59         virtual void requestNextVsync();    // asynchronous
     60         sp<EventThread> const mEventThread;
     61         sp<BitTube> const mChannel;
     62     };
     63 
     64 public:
     65 
     66     EventThread(const sp<SurfaceFlinger>& flinger);
     67 
     68     sp<Connection> createEventConnection() const;
     69     status_t registerDisplayEventConnection(const sp<Connection>& connection);
     70 
     71     void setVsyncRate(uint32_t count, const sp<Connection>& connection);
     72     void requestNextVsync(const sp<Connection>& connection);
     73 
     74     // called before the screen is turned off from main thread
     75     void onScreenReleased();
     76 
     77     // called after the screen is turned on from main thread
     78     void onScreenAcquired();
     79 
     80     // called when receiving a vsync event
     81     void onVSyncReceived(int type, nsecs_t timestamp);
     82     void onHotplugReceived(int type, bool connected);
     83 
     84     Vector< sp<EventThread::Connection> > waitForEvent(
     85             DisplayEventReceiver::Event* event);
     86 
     87     void dump(String8& result, char* buffer, size_t SIZE) const;
     88 
     89 private:
     90     virtual bool        threadLoop();
     91     virtual void        onFirstRef();
     92 
     93     void removeDisplayEventConnection(const wp<Connection>& connection);
     94     void enableVSyncLocked();
     95     void disableVSyncLocked();
     96 
     97     // constants
     98     sp<SurfaceFlinger> mFlinger;
     99     PowerHAL mPowerHAL;
    100 
    101     mutable Mutex mLock;
    102     mutable Condition mCondition;
    103 
    104     // protected by mLock
    105     SortedVector< wp<Connection> > mDisplayEventConnections;
    106     Vector< DisplayEventReceiver::Event > mPendingEvents;
    107     DisplayEventReceiver::Event mVSyncEvent[HWC_DISPLAY_TYPES_SUPPORTED];
    108     bool mUseSoftwareVSync;
    109 
    110     // for debugging
    111     bool mDebugVsyncEnabled;
    112 };
    113 
    114 // ---------------------------------------------------------------------------
    115 
    116 }; // namespace android
    117 
    118 // ---------------------------------------------------------------------------
    119 
    120 #endif /* ANDROID_SURFACE_FLINGER_EVENT_THREAD_H */
    121