/* draw line with alpha corresponding to coarsest level */
const uint8_t a = max(8, (int)rint(UINT_RGBA_A(base) / (0.8 * log2(level))));
const uint32_t c = UINT_RGBA_CHANGE_A(base, a);
/* draw line with alpha corresponding to coarsest level */
const uint8_t a = max(8, (int)rint(UINT_RGBA_A(base) / (0.8 * log2(level))));
const uint32_t c = UINT_RGBA_CHANGE_A(base, a);