long lbx_img_read_row_header(struct lbx_image *img, unsigned *x, unsigned *y);
long lbx_img_read_row_data(struct lbx_image *img, void *buf);
long lbx_img_read_row_header(struct lbx_image *img, unsigned *x, unsigned *y);
long lbx_img_read_row_data(struct lbx_image *img, void *buf);