Returns the receiver's fill rule, which will be one of <code>SWT.FILL_EVEN_ODD</code> or <code>SWT.FILL_WINDING</code>.
@return the receiver's fill rule
@exception SWTException <ul> <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> </ul>
@since 3.1
See Implementation
Returns the receiver's fill rule, which will be one of <code>SWT.FILL_EVEN_ODD</code> or <code>SWT.FILL_WINDING</code>.
@return the receiver's fill rule
@exception SWTException <ul> <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> </ul>
@since 3.1