BOX_C0_SHIFT      956 libgd/gd_topal.c   maxc0 = minc0 + ((1 << BOX_C0_SHIFT) - (1 << C0_SHIFT));
BOX_C0_SHIFT     1237 libgd/gd_topal.c   minc0 = (c0 << BOX_C0_SHIFT) + ((1 << C0_SHIFT) >> 1);