This enumeration restricts barcode searching to certain orientations, or prioritizes one orientation over the other.
Values:
| IG_TW_BD_HORZ | Horizontal mode. |
| IG_TW_BD_HORZVERT | Horizontal/Vertical mode. |
| IG_TW_BD_VERT | Vertical mode. |
| IG_TW_BD_VERTHORZ | Vertical/Horizontal mode. |