Merge "Surface: Ensure synchronisation of copyBlt"

#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>

        if (canCopyBack) {

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

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

            if (!copyback.isEmpty())

            if (!copyback.isEmpty()) {

                if (fenceFd >= 0) {

                    sync_wait(fenceFd, -1);

                    close(fenceFd);

                    fenceFd = -1;

                }

                copyBlt(backBuffer, frontBuffer, copyback);

            }

        } else {

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

            // region to make sure they redraw the whole buffer