void InterframeOff(rfbClientPtr cl)
{
  if (cl->compareFB) {
    free(cl->compareFB);
    REGION_UNINIT(pScreen, &cl->ifRegion);
    rfbLog("Interframe comparison disabled\n");
  }
  cl->compareFB = NULL;
  cl->fb = rfbFB.pfbMemory;
}
void InterframeOff(rfbClientPtr cl)
{
  if (cl->compareFB) {
    free(cl->compareFB);
    REGION_UNINIT(pScreen, &cl->ifRegion);
    rfbLog("Interframe comparison disabled\n");
  }
  cl->compareFB = NULL;
  cl->fb = rfbFB.pfbMemory;
}