Identifies transparency modes.
Values:
| IG_DSPL_TRANSPARENCY_NONE | Transparency is disabled. |
| IG_DSPL_TRANSPARENCY_COLOR | Transparency color is enabled. Pixels which color is equal to the Transparency Color value are displayed transparent when drawing the image. |
| IG_DSPL_TRANSPARENCY_MASK | Transparency Mask is enabled and the Transparency Mask image is used to specify transparent pixels. |
| IG_DSPL_TRANSPMASK_STRETCH_TO_IMAGE | If this flag is set, the transparency Mask image is resized and oriented along with the image being displayed. This flag is only used when the transparency mask is enabled. |
| IG_DSPL_TRANSPMASK_LOCATE_TO_IMAGE | If this flag is set, the transparency mask location is calculated relatively to the Image Rectangle. The mask is oriented along with the image. This flag is only used when the transparency mask is enabled. |
| IG_DSPL_TRANSPMASK_LOCATE_TO_CLIPRECT | If this flag is set, the transparency mask location is calculated relatively to the Clipping Rectangle. This flag is only used when the transparency mask is enabled. |
| IG_DSPL_TRANSPMASK_LOCATE_ABSOLUTE | If this flag is set, the transparency mask left-top corner is located according to the MaskLocation option. This flag is only used when the transparency mask is enabled. |
| IG_DSPL_TRANSPMASK_LOCATE_MODE | Bit mask for mask location modes. |