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From: jg@jumbo.dec.com (Jim Gettys)
Newsgroups: comp.windows.x
Subject: Re: Widget tracking
Message-ID: <943@jumbo.dec.com>
Date: Tue, 22-Sep-87 19:58:26 EDT
Article-I.D.: jumbo.943
Posted: Tue Sep 22 19:58:26 1987
Date-Received: Fri, 25-Sep-87 00:45:42 EDT
References: <870922-063108-11818@Xerox> <20907@ucbvax.BERKELEY.EDU>
Reply-To: jg@jumbo.UUCP (Jim Gettys)
Organization: DEC Systems Research Center, Palo Alto
Lines: 11

Note that the V11 X library comes with a set of region code; your
application can use it for computing if a mouse hit is in a region
or for computing regions for later graphics output.

GC's on V11 also support region clipping; you can restrict output
to an arbitrary region on the screen.  These regions can be computed
by your application, and set into a GC, or can be generated by graphics
operations to a single plane pixmap (bitmap) and set into the GC.
Once set, all graphics operations using that GC will be clipped to
the region.
				-, 
g1