let dst: &mut [u8] = data.as_mut_slice();
if check_pos(x >> 1, y >> 1, cw, ch, fw, fh, dx, dy, 0, 1, 0, 1) {
let sstride = prev_frame.get_stride(comp);
let dst: &mut [u8] = data.as_mut_slice();
if check_pos(x >> 1, y >> 1, cw, ch, fw, fh, dx, dy, 0, 1, 0, 1) {
let sstride = prev_frame.get_stride(comp);