Merge "Surface: Use async lock/unlock in copyBlt" am: b73de86f am: e29dda82

#include <android/native_window.h>

// We would eliminate the non-conforming zero-length array, but we can't since

// this is effectively included from the Linux kernel

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Wzero-length-array"

#include <sync/sync.h>

#pragma clang diagnostic pop

#include <binder/Parcel.h>

#include <utils/Log.h>

static status_t copyBlt(

        const sp<GraphicBuffer>& dst,

        const sp<GraphicBuffer>& src,

        const Region& reg)

        const Region& reg,

        int *dstFenceFd)

{

    // src and dst with, height and format must be identical. no verification

    // is done here.

    ALOGE_IF(err, "error locking src buffer %s", strerror(-err));

    uint8_t* dst_bits = NULL;

    err = dst->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, reg.bounds(),

            reinterpret_cast<void**>(&dst_bits));

    err = dst->lockAsync(GRALLOC_USAGE_SW_WRITE_OFTEN, reg.bounds(),

            reinterpret_cast<void**>(&dst_bits), *dstFenceFd);

    ALOGE_IF(err, "error locking dst buffer %s", strerror(-err));

    *dstFenceFd = -1;

    Region::const_iterator head(reg.begin());

    Region::const_iterator tail(reg.end());

        src->unlock();

    if (dst_bits)

        dst->unlock();

        dst->unlockAsync(dstFenceFd);

    return err;

}

            // copy the area that is invalid and not repainted this round

            const Region copyback(mDirtyRegion.subtract(newDirtyRegion));

            if (!copyback.isEmpty()) {

                if (fenceFd >= 0) {

                    sync_wait(fenceFd, -1);

                    close(fenceFd);

                    fenceFd = -1;

                }

                copyBlt(backBuffer, frontBuffer, copyback);

                copyBlt(backBuffer, frontBuffer, copyback, &fenceFd);

            }

        } else {

            // if we can't copy-back anything, modify the user's dirty