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From: aipdc@castle.ed.ac.uk (Paul Crowley)
Newsgroups: comp.windows.x
Subject: Does anyone have any working XGetRGBColormap code?
Message-ID: <9138@castle.ed.ac.uk>
Date: 13 Mar 91 21:05:12 GMT
Organization: Put your analyst on danger money, baby!
Lines: 22

I have code that needs the colourmap set up such that different colours
are on different bitplanes, so when gc.function == GXor, and I plot
something red over something blue, the resulting pixel will be magenta.
I'm also trying to be sociable about it with regards to other programs.

First, on what window should I be calling XGetRGBColourmaps?  I'm using
the root and getting nada.

Secondly, what is it giving me back?  Is it placing a pointer to an
array of XStandardColormaps in whatever the third argument points to,
and mallocing the space for the array?  If so, do I need to free it?

Thirdly, if the property does not exist, how should I go about creating
it?  This seems to me the toughie.  It seems to me I have to search all
the visuals for a suitable one (ie one of PseudoColor or DirectColor)
set up a suitable colormap, and define the property.  This seems like
hassle, and if anyone has done it already, could they contact me?

Thanks,
                                         ____
\/ o\ Paul Crowley aipdc@uk.ac.ed.castle \  /
/\__/ Part straight. Part gay. All queer. \/