if (sx - 2 < 0) || (sx + 8 + 2 > (w as isize)) ||
(sy - 2 < 0) || (sy + 8 + 2 > (h as isize)) {
edge_emu(&src, sx - 2, sy - 2, 8 + 2 + 2, 8 + 2 + 2,
if (sx - 2 < 0) || (sx + 8 + 2 > (w as isize)) ||
(sy - 2 < 0) || (sy + 8 + 2 > (h as isize)) {
edge_emu(&src, sx - 2, sy - 2, 8 + 2 + 2, 8 + 2 + 2,