213       png_uint_16 base = png_sRGB_base[ibase >> 7], trybase = base, ob=base;  in main()  local
219          png_sRGB_base[ibase >> 7] = trybase;  in main()
240             ++trybase; /* First test */  in main()
245             if (trybase > base)  in main()
247                base = trybase;  in main()
248                ++trybase;  in main()
250             else if (trybase < base)  in main()
252                base = trybase;  in main()
253                --trybase;  in main()
275             if (trybase > base)  in main()
276                trybase = base-1;  in main()
277             else if (trybase < base)  in main()
279                trybase = base;  in main()