410             int thr1y, thr2y, off1, off2, thr1, thr2, a1, a2;  in jpegd_setup_pp()  local
416                 thr2 = 219 - thr1;  in jpegd_setup_pp()
420                 tmp2 = ((thr2y - thr1y) * 256) / (thr2 - thr1);  in jpegd_setup_pp()
422                 off2 = ((thr2y - ((tmp1 * thr2) / 256)) * a) / 256;  in jpegd_setup_pp()
427                 a2 = a1 + (256 * (off2 - 1)) / (thr2 - thr1);  in jpegd_setup_pp()
432                 thr2 = 256 - thr1;  in jpegd_setup_pp()
435                 a2 = ((thr2y - thr1y) * 256) / (thr2 - thr1);  in jpegd_setup_pp()
437                 off2 = thr2y - (a1 * thr2) / 256;  in jpegd_setup_pp()
455             if (thr2 > 255)  in jpegd_setup_pp()
456                 thr2 = 255;  in jpegd_setup_pp()
457             else if (thr2 < 0)  in jpegd_setup_pp()
458                 thr2 = 0;  in jpegd_setup_pp()
471             reg->reg31.sw_contrast_thr2 = thr2;  in jpegd_setup_pp()