🚀 go-pugleaf

First of all, I don't read this newsgroup so don't flame me if I'm 
dredging up an old topic.

I am having troubles with colormaps.  What I am working on is an
application that will display run-length-encoded files (ala Utah).
We have getX11, but this program uses the default colormap and 
dithering to accomplish the imaging.  I actually want to analyze the
colors in the picture and construct a colormap on the fly.  Constructing
the colormap is not a problem.  I can't figure out how to use it.  I have
tried two things:

i)  cmap=XCreateColormap(display,window,visual,AllocAll);

	Whenever I use AllocAll in this call it does something funky
	to display.  The side effect is that it bombs when it hits
	XNextEvent(display,&e).  Reason?

ii) cmap=XCreateColormap(display,window,visual,AllocNone);

	Now how do I allocate colorcells?  The XStoreColors and
	XInstallColormap calls work fine, but when I try using these
	colors they're private(this makes sense to me, I need to
	acquire some of these cells for my own private use, right?).

	It seems that XAllocColorCells is too complicated for my
	purposes.  What's all the plane_masks crap for?  All I want
	is a given number of cells (say 256) and their pixel numbers
	that I can assign RGB values to in the colormap.  There must
	be an easy way to do this!

By the way, I was reading in the Xlib programming manual by Nye that you
can specify 0 for nplanes and ncolors for the number of cells you want and
it will give you that many cells w/o the bullshit.  It didn`t seem to work
for any value of ncolors (I put it in a loop from 256 down to 0).  This
is on p. 189 of the book in case anyone wants to double check or refute
(I wish you would!) this.

Finally, when I actually do get around to building the virtual colormap
successfully, do I use XInstallColormap or XSetWindowColormap?  In case
you need to know, we are running X11/NeWS and OpenWindows on Sun Sparcs
(Sun4).

Thanks in advance for any assisstance.


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                   ______  ___                       
Darren Anderson     \     \  |    _       anderdla@cs.uoregon.edu
1656 Walnut St.      |     | |   / \                   
Eugene, Ore. 97403   |     | |  /___\      "MTV is like this very
                    /_____/  | /     \      big advertising agency,
                            /______   \     and its only client is 
                           /       \   \    itself."
                                                      
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