fprintf(stderr,"rrb is %p %d %dx%d\n", rrb, offset, rrb->base.Width, rrb->base.Height);
cbpitch = (rrb->pitch / rrb->cpp);
if (rrb->cpp == 4)
fprintf(stderr,"rrb is %p %d %dx%d\n", rrb, offset, rrb->base.Width, rrb->base.Height);
cbpitch = (rrb->pitch / rrb->cpp);
if (rrb->cpp == 4)