995     ubyte *head, *tail, t0, t1, t2;  in prepImageForBacksideDuplex()  local
998         for (head = imagePtr, tail = imagePtr + numBytes - 1; tail > head;) {  in prepImageForBacksideDuplex()
1003             *head = *(tail - 2);  in prepImageForBacksideDuplex()
1004             *(head + 1) = *(tail - 1);  in prepImageForBacksideDuplex()
1005             *(head + 2) = *(tail - 0);  in prepImageForBacksideDuplex()
1006             *tail = t2;  in prepImageForBacksideDuplex()
1007             *(tail - 1) = t1;  in prepImageForBacksideDuplex()
1008             *(tail - 2) = t0;  in prepImageForBacksideDuplex()
1011             tail -= 3;  in prepImageForBacksideDuplex()
1014         for (head = imagePtr, tail = imagePtr + numBytes; tail > head;) {  in prepImageForBacksideDuplex()
1016             *head = *tail;  in prepImageForBacksideDuplex()
1017             *tail = t0;  in prepImageForBacksideDuplex()
1019             tail--;  in prepImageForBacksideDuplex()