Path: utzoo!censor!geac!jtsv16!uunet!bloom-beacon!POPEYE.NOSC.MIL!glasgow
From: glasgow@POPEYE.NOSC.MIL (Michael Glasgow)
Newsgroups: comp.windows.x
Subject: Colormaps and Visuals
Message-ID: <8909191908.AA04405@popeye.nosc.mil.sun.com>
Date: 19 Sep 89 19:08:25 GMT
Organization: The Internet
Lines: 45




     I am having a problem with Visuals and Colormaps.

     I am running on a Navy Desktop Computer, which is a Sun 4/110
and a CG6 color board.  I am running the XNews server provided
under Sun OS 4.0.3.

     The problem is that this server defines two visuals:  PseudoColor
and StaticColor.  The default is the StaticColor visual.  So, if I
AllocNamedColors with the DefaultColormap, I get something close, but
not exactly what I wanted.  What I want to do is to Alloc Colors from
the Colormap whose visual is of type PseudoColor.

     I am also using the X Toolkit.  If I weren't, I suppose that I
could simply create a window with the proper visual, and if I accessed
the default colormap of this window, I would be able to allocate my
colors properly.  But in the Toolkit, there is no way to set the visual
for a given widget, at least none that I know of.  

     My question is this, how can I show true colors in a widget, when
the default visual is of type StaticColor?

     Also, is the DefaultColormap apply to a window, or does it apply
to a visual?  I have queried the Visuals and found the proper type,
but do no see how I can get the colormap from the Visual Info.
Maybe this is not possible, but it seems to me like it should be.

     One final note.  Is there a call that returns the number of
un-allocated color cells in a Colormap?  Such as:

   XQueryFreeCells( dpy, cmap, cells, ncells )
        Display  *dpy;
        Colormap cmap;
        XColor   cells[ncells];
        int      *ncells;

     This call would return the number of free cells in a colormap,
as well as a list of all of the free cells.  Is there a way to do
this now?  And if not, will something like this be added in the
future?

Michael Glasgow
glasgow@popeye.nosc.mil