uint8_t* p = _image->data()[i];
uint8_t* q = yuv->data()[i];
for (int j = 0; j < yuv->lines (i); ++j) {
memcpy (p + half_line_size, q + half_line_size, half_line_size);
uint8_t* p = _image->data()[i];
uint8_t* q = yuv->data()[i];
for (int j = 0; j < yuv->lines (i); ++j) {
memcpy (p + half_line_size, q + half_line_size, half_line_size);