Path: utzoo!attcan!uunet!husc6!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU (Bob Scheifler)
Newsgroups: comp.windows.x
Subject: Re: CLX and inverting pixels
Message-ID: <8901052004.AA06362@EXPIRE.LCS.MIT.EDU>
Date: 5 Jan 89 20:04:08 GMT
References: <34700004@zaphod>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 7

CLX is currently kinda hard to understand (due to lack of documentation)
unless you are already familiar with X via some other path (the protocol
spec or the Xlib manual).  You need to look at the gcontext-function;
setting it to boole-c2 and going normal graphics (e.g. a fill rectangle)
will cause inversion.  For more complex examples (cast in the context
of C), check out the color tutorial in R3 in doc/tutorials/color.tbl.ms,
also found as Chapter 7 in the O'Reilly Xlib book Volume 1.