blk_to_2d_position
fd_position = blk_to_2d_position;
fd_position = blk_to_2d_position;
bool blk_to_2d_position(uint32_t, uint32_t *, int *);
blk_to_2d_position(i, &pos, &cnt);
if (!blk_to_2d_position(block, &pos, &cnt)) {