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From: rws@EXPO.LCS.MIT.EDU (Bob Scheifler)
Newsgroups: comp.windows.x
Subject: Re: XImage
Message-ID: <8910271829.AA08183@expire.lcs.mit.edu>
Date: 27 Oct 89 18:29:25 GMT
References: <3048@marble.sw.mcc.com>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
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    To invert an XImage, I can think of creating a pixmap of same size and
    depth, copying the image (with XPutImage and GXcopyInverted) into the 
    pixmap, and retrieving the image back from the pixmap (XGetImage).

That's a possible way, but probably not the fastest (although it depends
a lot on the size of the image, and the relative performance of the client,
the server, and the network connection).  You can simply use XGetPixel and
XPutPixel and do it all on the client side.  The GetPixel/PutPixel code is
rather slow in R3, but this will be fixed in R4.