for (i = 0; i < cblk->x1 - cblk->x0; i++) {
int tmp=t1_data[j][i];
if (tmp>>1==0) tilec->data[x + i + (y + j) * (tilec->x1 - tilec->x0)] = 0;
for (i = 0; i < cblk->x1 - cblk->x0; i++) {
int tmp=t1_data[j][i];
if (tmp>>1==0) tilec->data[x + i + (y + j) * (tilec->x1 - tilec->x0)] = 0;