Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!bloom-beacon!EXPO.LCS.MIT.EDU!converse
From: converse@EXPO.LCS.MIT.EDU (Donna Converse)
Newsgroups: comp.windows.x
Subject: Re: Determining color/black-white
Message-ID: <8906231951.AA10339@expo.lcs.mit.edu>
Date: 23 Jun 89 19:51:08 GMT
References: <8906231926.AA12265@apple-gunkies.ai.mit.edu>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: X Consortium, MIT Laboratory for Computer Science
Lines: 19


> What is the best method of determining if a screen supports color or
> not?  

Use XGetVisualInfo() to determine which visuals are available on 
the screen, then select a visual appropriate to your application.
Also, check the colormap size fields of the visual types.

Remember, a screen can have multiple visuals, and the default
visual of a screen with color capability is not necessarily
a visual with color capability.

See section 10.8 of Scheifler, Gettys & Newman.
See also "Visualizing X11 Clients", by David Lemke and David
Rosenthal, published in the Usenix Winter 89 conference proceedings.


Donna Converse
converse@expo.lcs.mit.edu