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Commit 377c2033 authored by Matthew Bouyack's avatar Matthew Bouyack
Browse files

In SurfaceFlinger, test fence before merging 

If the old fence for a given layer has already expired, we can replace
it with the new fence rather than merging the two.

This saves 300-400us per frame on Android Wear

Change-Id: I5d907c336c7383ae4e2e0f71e42f23749494a359
parent 6db42ac3

libs/gui/ConsumerBase.cpp

+12 −0
Original line number Diff line number Diff line
@@ -314,6 +314,18 @@ status_t ConsumerBase::addReleaseFenceLocked(int slot, 


    if (!mSlots[slot].mFence.get()) {

        mSlots[slot].mFence = fence;

        return OK;

    }



    auto signaled = mSlots[slot].mFence->hasSignaled();



    if (!signaled) {

        CB_LOGE("fence has invalid state");

        return BAD_VALUE;

    }



    if (*signaled) {

        mSlots[slot].mFence = fence;

    } else {

        char fenceName[32] = {};

        snprintf(fenceName, 32, "%.28s:%d", mName.string(), slot);