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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_SURFACE_FLINGER_EVENT_THREAD_H
#define ANDROID_SURFACE_FLINGER_EVENT_THREAD_H
#include <stdint.h>
#include <sys/types.h>
#include <gui/DisplayEventReceiver.h>
#include <gui/IDisplayEventConnection.h>
#include <utils/Errors.h>
#include <utils/threads.h>
#include <utils/SortedVector.h>
#include "DisplayHardware/DisplayHardware.h"
// ---------------------------------------------------------------------------
namespace android {
// ---------------------------------------------------------------------------
class SurfaceFlinger;
// ---------------------------------------------------------------------------
class EventThread : public Thread, public DisplayHardware::VSyncHandler {
class Connection : public BnDisplayEventConnection {
public:
Connection(const sp<EventThread>& eventThread);
status_t postEvent(const DisplayEventReceiver::Event& event);
// count >= 1 : continuous event. count is the vsync rate
// count == 0 : one-shot event that has not fired
// count ==-1 : one-shot event that fired this round / disabled
// count ==-2 : one-shot event that fired the round before
int32_t count;
private:
virtual ~Connection();
virtual void onFirstRef();
virtual sp<BitTube> getDataChannel() const;
virtual void setVsyncRate(uint32_t count);
virtual void requestNextVsync(); // asynchronous
sp<EventThread> const mEventThread;
sp<BitTube> const mChannel;
};
public:
EventThread(const sp<SurfaceFlinger>& flinger);
sp<Connection> createEventConnection() const;
status_t registerDisplayEventConnection(const sp<Connection>& connection);
status_t unregisterDisplayEventConnection(const wp<Connection>& connection);
void setVsyncRate(uint32_t count, const sp<Connection>& connection);
void requestNextVsync(const sp<Connection>& connection);
// called before the screen is turned off from main thread
void onScreenReleased();
// called after the screen is turned on from main thread
void onScreenAcquired();
void dump(String8& result, char* buffer, size_t SIZE) const;
private:
virtual bool threadLoop();
virtual status_t readyToRun();
virtual void onFirstRef();
virtual void onVSyncReceived(int, nsecs_t timestamp);
void removeDisplayEventConnection(const wp<Connection>& connection);
void enableVSyncLocked();
void disableVSyncLocked();
// constants
sp<SurfaceFlinger> mFlinger;
DisplayHardware& mHw;
mutable Mutex mLock;
mutable Condition mCondition;
// protected by mLock
SortedVector< wp<Connection> > mDisplayEventConnections;
nsecs_t mLastVSyncTimestamp;
nsecs_t mVSyncTimestamp;
bool mUseSoftwareVSync;
// main thread only
size_t mDeliveredEvents;
// for debugging
bool mDebugVsyncEnabled;
};
// ---------------------------------------------------------------------------
}; // namespace android
// ---------------------------------------------------------------------------
#endif /* ANDROID_SURFACE_FLINGER_EVENT_THREAD_H */
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