for (xindex = 1; xindex < width; xindex++) {
Rc = Rb;
Rb = GETJSAMPLE(prev_row[xindex]);
Ra = (diff_buf[xindex] + PREDICTOR6) & 0xFFFF;
for (xindex = 1; xindex < width; xindex++) {
Rc = Rb;
Rb = GETJSAMPLE(prev_row[xindex]);
Ra = (diff_buf[xindex] + PREDICTOR6) & 0xFFFF;