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 <utils/Errors.h> 27 #include <utils/threads.h> 28 #include <utils/SortedVector.h> 29 30 #include "DisplayHardware/DisplayHardware.h" 31 32 // --------------------------------------------------------------------------- 33 34 namespace android { 35 36 // --------------------------------------------------------------------------- 37 38 class SurfaceFlinger; 39 40 // --------------------------------------------------------------------------- 41 42 class EventThread : public Thread, public DisplayHardware::VSyncHandler { 43 class Connection : public BnDisplayEventConnection { 44 public: 45 Connection(const sp<EventThread>& eventThread); 46 status_t postEvent(const DisplayEventReceiver::Event& event); 47 48 // count >= 1 : continuous event. count is the vsync rate 49 // count == 0 : one-shot event that has not fired 50 // count ==-1 : one-shot event that fired this round / disabled 51 // count ==-2 : one-shot event that fired the round before 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 status_t unregisterDisplayEventConnection(const wp<Connection>& connection); 71 72 void setVsyncRate(uint32_t count, const sp<Connection>& connection); 73 void requestNextVsync(const sp<Connection>& connection); 74 75 // called before the screen is turned off from main thread 76 void onScreenReleased(); 77 78 // called after the screen is turned on from main thread 79 void onScreenAcquired(); 80 81 void dump(String8& result, char* buffer, size_t SIZE) const; 82 83 private: 84 virtual bool threadLoop(); 85 virtual status_t readyToRun(); 86 virtual void onFirstRef(); 87 virtual void onVSyncReceived(int, nsecs_t timestamp); 88 89 void removeDisplayEventConnection(const wp<Connection>& connection); 90 void enableVSyncLocked(); 91 void disableVSyncLocked(); 92 93 // constants 94 sp<SurfaceFlinger> mFlinger; 95 DisplayHardware& mHw; 96 97 mutable Mutex mLock; 98 mutable Condition mCondition; 99 100 // protected by mLock 101 SortedVector< wp<Connection> > mDisplayEventConnections; 102 nsecs_t mLastVSyncTimestamp; 103 nsecs_t mVSyncTimestamp; 104 bool mUseSoftwareVSync; 105 106 // main thread only 107 size_t mDeliveredEvents; 108 109 // for debugging 110 bool mDebugVsyncEnabled; 111 }; 112 113 // --------------------------------------------------------------------------- 114 115 }; // namespace android 116 117 // --------------------------------------------------------------------------- 118 119 #endif /* ANDROID_SURFACE_FLINGER_EVENT_THREAD_H */ 120
