Supported barcode rotations. 
Enumerations for all supported barcode rotations (counter-clockwise) 
- Enumerator: 
- 
| deg0 | =0: No rotation  |  | deg90 | =1: 90° rotated counter-clockwise  |  | deg180 | =2: 180° rotated counter-clockwise (bottom-up)  |  | deg270 | =3: 270° rotated counter-clockwise  |