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Commit 8816376a authored by Alec Mouri's avatar Alec Mouri Committed by Gerrit Code Review
Browse files

Merge "Dispatch vsync when receiving vsync timeout to handle vsync loss."

parents 074b68f4 fc690e2a

libs/gui/DisplayEventDispatcher.cpp

+17 −1
Original line number Diff line number Diff line
@@ -33,10 +33,13 @@ namespace android { 
// using just a few large reads.

static const size_t EVENT_BUFFER_SIZE = 100;



static constexpr nsecs_t WAITING_FOR_VSYNC_TIMEOUT = ms2ns(300);



DisplayEventDispatcher::DisplayEventDispatcher(

        const sp<Looper>& looper, ISurfaceComposer::VsyncSource vsyncSource,

        ISurfaceComposer::EventRegistrationFlags eventRegistration)

      : mLooper(looper), mReceiver(vsyncSource, eventRegistration), mWaitingForVsync(false) {

      : mLooper(looper), mReceiver(vsyncSource, eventRegistration), mWaitingForVsync(false),

        mLastVsyncCount(0), mLastScheduleVsyncTime(0) {

    ALOGV("dispatcher %p ~ Initializing display event dispatcher.", this);

}
@@ -86,6 +89,7 @@ status_t DisplayEventDispatcher::scheduleVsync() { 
        }



        mWaitingForVsync = true;

        mLastScheduleVsyncTime = systemTime(SYSTEM_TIME_MONOTONIC);

    }

    return OK;

}
@@ -124,9 +128,21 @@ int DisplayEventDispatcher::handleEvent(int, int events, void*) { 
              this, ns2ms(vsyncTimestamp), to_string(vsyncDisplayId).c_str(), vsyncCount,

              vsyncEventData.id);

        mWaitingForVsync = false;

        mLastVsyncCount = vsyncCount;

        dispatchVsync(vsyncTimestamp, vsyncDisplayId, vsyncCount, vsyncEventData);

    }



    if (mWaitingForVsync) {

        const nsecs_t currentTime = systemTime(SYSTEM_TIME_MONOTONIC);

        const nsecs_t vsyncScheduleDelay = currentTime - mLastScheduleVsyncTime;

        if (vsyncScheduleDelay > WAITING_FOR_VSYNC_TIMEOUT) {

            ALOGW("Vsync time out! vsyncScheduleDelay=%" PRId64 "ms", ns2ms(vsyncScheduleDelay));

            mWaitingForVsync = false;

            dispatchVsync(currentTime, vsyncDisplayId /* displayId is not used */,

                          ++mLastVsyncCount, vsyncEventData /* empty data */);

        }

    }



    return 1; // keep the callback

}

libs/gui/include/gui/DisplayEventDispatcher.h

+2 −0
Original line number Diff line number Diff line
@@ -56,6 +56,8 @@ private: 
    sp<Looper> mLooper;

    DisplayEventReceiver mReceiver;

    bool mWaitingForVsync;

    uint32_t mLastVsyncCount;

    nsecs_t mLastScheduleVsyncTime;



    std::vector<FrameRateOverride> mFrameRateOverrides;