Path: utzoo!attcan!uunet!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU (Bob Scheifler)
Newsgroups: comp.windows.x
Subject: Re: Colormaps (was ...and Visuals)
Message-ID: <8909221230.AA22089@expire.lcs.mit.edu>
Date: 22 Sep 89 12:30:12 GMT
References: <3853@helios.ee.lbl.gov>
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Organization: The Internet
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    Sorry, XAllocColorPlanes will allocate contiguous PLANES, not cells.

Correct, as does XAllocColorCells.  If you want to contiguous entries,
you can round up to a power of 2^N, and use XAllocColorCells with
npixels = 1 and nplanes = N and contig = True, you can treat the resulting
values as "contiguous", subject to shift and an add (take the numbers 0
through 2^N-1, shift them up to the planemask, then add the base pixel).
If you didn't want a power of 2, you can free the extras.  This is not
optimal, but it can be done.