NAME
    XorRectRegion -- Perform 2d XOR operation of rectangle
                     with region, leaving result in region

SYNOPSIS
    status = XorRectRegion(region,rectangle)
    d0                     a0      a1

    BOOL XorRectRegion( struct region *, struct rectangle * );

FUNCTION
    Add portions of rectangle to region if they are not in
    the region.
    Remove portions of rectangle from region if they are
    in the region.

INPUTS
    region - pointer to region structure
    rectangle - pointer to rectangle structure

RESULTS
    status - return TRUE if successful operation
             return FALSE if ran out of memory

BUGS

SEE ALSO
    orregionregion() andregionregion() graphics/regions.h