SYNTAX
GC XtGetGC(Widget w, XtGCMask value_mask, XGCValues * values);
void XtReleaseGC(Widget w, GC gc);
 
DESCRIPTION
 The  
XtGetGC function returns a sharable, read-only GC. The parameters to this function are the same as those for  
XCreateGC except that a widget is passed instead of a display.  
XtGetGC shares only GCs in which all values in the GC returned by  
XCreateGC are the same. In particular, it does not use the value_mask provided to determine which fields of the GC a widget considers relevant. The value_mask is used only to tell the server which fields should be filled in with widget data and which it should fill in with default values. For further information about value_mask and values, see  
XCreateGC in the  
Xlib - C Language X Interface.
The  XtReleaseGC function deallocate the specified shared GC.