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From: ekberg@asl.dl.nec.COM (Tom Ekberg)
Newsgroups: comp.windows.x
Subject: Re: overlay function in X
Message-ID: <9102191541.AA24623@asl.dl.nec.com>
Date: 19 Feb 91 15:41:09 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 11


 > In case there's anyone out there who cares, something I would really like in
 > X is an overlay function of the sort
 > 
 > 	pixel_out = (pixel_1 == 0? pixel_2:pixel_1);

Try XCopyPlane.  I think it does exactly what you want.  If the bit in the
bitmap is 0 then it draws the background color; if it is one then it draws the
foreground color.

  -- tom, ekberg@aslss02.asl.dl.nec.com (x3503)