391             int thr1y, thr2y, off1, off2, thr1, thr2, a1, a2;  in jpegd_setup_pp()  local
397                 thr2 = 219 - thr1;  in jpegd_setup_pp()
401                 tmp2 = ((thr2y - thr1y) * 256) / (thr2 - thr1);  in jpegd_setup_pp()
403                 off2 = ((thr2y - ((tmp1 * thr2) / 256)) * a) / 256;  in jpegd_setup_pp()
408                 a2 = a1 + (256 * (off2 - 1)) / (thr2 - thr1);  in jpegd_setup_pp()
413                 thr2 = 256 - thr1;  in jpegd_setup_pp()
416                 a2 = ((thr2y - thr1y) * 256) / (thr2 - thr1);  in jpegd_setup_pp()
418                 off2 = thr2y - (a1 * thr2) / 256;  in jpegd_setup_pp()
436             if (thr2 > 255)  in jpegd_setup_pp()
437                 thr2 = 255;  in jpegd_setup_pp()
438             else if (thr2 < 0)  in jpegd_setup_pp()
439                 thr2 = 0;  in jpegd_setup_pp()
452             post->reg69.sw_contrast_thr2 = thr2;  in jpegd_setup_pp()