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From: gropp-bill@CS.Yale.EDU (Bill Gropp)
Newsgroups: comp.windows.x
Subject: Colormaps
Message-ID: <5932@cs.yale.edu>
Date: 17 Nov 89 18:45:44 GMT
Article-I.D.: cs.5932
Sender: news@cs.yale.edu
Reply-To: gropp-bill@CS.Yale.EDU (Bill Gropp)
Organization: Yale University Computer Science Dept, New Haven CT  06520-2158
Lines: 24

What is the best way to do the following:

    I have an application that wants to have its own colormap for a window;
    the colors in this window should be dynamic and defineable by the 
    application.  The number of colors needed may be small relative to
    the number of colors available on the server (for example, 8 colors
    on an 8 plane system). 

    When my colormap is installed by the window manager, I'd like the
    least damage done to other applications.  In particular, I'd like
    to maintain "WhitePixel" and "BlackPixel" as meaning "white" and
    "black", even if it means adding additional colors to my colormap.

    Currently, I create a colormap and use XAllocColor to set entries
    in it.  Under uwm and twm on a Sun, when my window's colormap is 
    installed, other windows that are in black and white only are unchanged.
    On a dec3100 using dxwm, black stays black but white becomes red.  
    I understand that when one colormap is installed, other windows will
    be displayed in false color (black and red in this case).  What
    I want to know is what is the Mechanism for preserving as much of 
    the "default" colormap as possible.

Thanks in advance.
Bill Gropp