J2KREGIONOFINTEREST
typedef enum tagJ2KREGIONOFINTEREST
{
   J2K_USE_LEAD_REGION, // Use the LEAD bitmap region to 
 define
   // the region of interest
   J2K_USE_OPTION_RECT // Use the rectangle specified in 
 the rcROI 
   // member of the FILEJ2KOPTIONS structure to
   // define the region of interest.
} J2KREGIONOFINTEREST, L_FAR* pJ2KREGIONOFINTEREST;
The J2KREGIONOFINTEREST data type is used within the FILEJ2KOPTIONS structure to indicate how to define the region of interest.
Comments
If J2K_USE_LEAD_REGION is used, then any region shape is acceptable. It will be converted internally by the filter to a rectangle.