BOX_C1_SHIFT      958 ext/gd/libgd/gd_topal.c   maxc1 = minc1 + ((1 << BOX_C1_SHIFT) - (1 << C1_SHIFT));
BOX_C1_SHIFT     1238 ext/gd/libgd/gd_topal.c   minc1 = (c1 << BOX_C1_SHIFT) + ((1 << C1_SHIFT) >> 1);