Blit
fOutput->Blit(0, fY, fColumns, fScrollBottom - fY, 0, fY + 1);
fOutput->Blit(0, fScrollTop + 1, fColumns, fY - fScrollTop, 0, fScrollTop);
void Blit(int32 srcx, int32 srcy, int32 width, int32 height, int32 destx, int32 desty);