This function creates a region from the two specified source regions and places the resulting region in the destination region. The resulting region is dst_rgn = src_rgn1 - src_rgn2.
| Type | Name | Description |
|---|---|---|
| GR_REGION_ID | dst_rgn | The ID of the destination region. |
| GR_REGION_ID | src_rgn1 | The ID of the the first of two source regions. |
| GR_REGION_ID | src_rgn2 | The ID of the second of two source regions. |