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From: keith@expo.lcs.mit.EDU (Keith Packard)
Newsgroups: comp.windows.x
Subject: Re: white and black colors in the X server
Message-ID: <9105311752.AA00413@xenon.lcs.mit.edu>
Date: 31 May 91 17:52:57 GMT
References: <"31-May-91.12:33:33.EDT".*.Nagesh_Pabbisetty.Henr801C@Xerox.com>
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
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> The fact that whitePixel is 0 and blackPixel is 1 has been built into the code
> at several places in the implementation on the X11R4 server.

This is simply untrue.  The DEC QVSS - the first machine to ever run X11 is
a monochrome display with blackPixel 0 and whitePixel 1.

The cfb code does (by default) allocate white pixel before black pixel, which
generally causes white = 0 and black = 1; a trivial modification which assigns
the appropriate values before calling cfbCreateDefColormap makes it possible
to use any pixel values you'd like.