BOX_C0_SHIFT      670 third_party/libjpeg/jquant2.c   maxc0 = minc0 + ((1 << BOX_C0_SHIFT) - (1 << C0_SHIFT));
BOX_C0_SHIFT      881 third_party/libjpeg/jquant2.c   minc0 = (c0 << BOX_C0_SHIFT) + ((1 << C0_SHIFT) >> 1);