Returns the GCData.
<p>
<b>IMPORTANT:</b> This method is <em>not</em> part of the public
API for <code>GC</code>. It is marked public only so that it
can be shared within the packages provided by SWT. It is not
available on all platforms, and should never be called from
application code.
</p>
@return the receiver's GCData
@exception SWTException <ul>
<li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
</ul>
Returns the GCData. <p> <b>IMPORTANT:</b> This method is <em>not</em> part of the public API for <code>GC</code>. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms, and should never be called from application code. </p>
@return the receiver's GCData
@exception SWTException <ul> <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> </ul>
@see GCData
@since 3.2