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Article #24218

Re: visual classes

#24218
From: Joshua Osborne
Date: Fri, 28 Jun 1991 20:25
39 lines
2374 bytes
In article <26521@beta.gov> aob@beta.gov (Alexander O. Brown) writes:
>How common are systems that only support TrueColor or StaticColor?

I imagine DirectColor is going to be more common, we have gooten good
at 8bit color, but "Visulation" (sorry 'bout the poor spelling) needs
more colors to work well.  I know you can have a >8bit PsudoColor, but
deep displays are normally DirectColor (or TrueColor).

TrueColor is only really going to be on 24bit deep displays (other displays
offen emulate them); how common do you think they will be?

I don't see any reason why StaticColor (only) systems would become more common.
They are rare now.

>Also, DirectColor is supposed to support PseudoColor.  How
>would I change the visual from Direct to Pseudo?

You don't, and it can't allways "support" it.  (i.e. if your DirectColor
was 6bit/4bit/4bit (I think the RS/6000 has a display like this) then you
only get 16 writable cells, you can't support a PsudoColor with more then
16 cells without a lot of tricks.

>                                                  Or is there
>always a Pseudo visual avaiable if the default is Direct?

This is not true.  And even if it was currently true, it doesn't mean it will
stay that way.

>                                                          Or
>do I simply just "simulate" Pseudo with code?

It isn't simple, but if you need writeable colorcells and you need to run on
all color systems, you will need to "simulate" writeable cells.
-- 
           stripes@eng.umd.edu          "Security for Unix is like
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Technical Details
Message-ID: <1991Jun28.202530.15560@eng.umd.edu>
Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!ccu.umanitoba.ca!herald.usask.ca!alberta!brazeau.ucs.ualberta.ca!unixg.ubc.ca!ubc-cs!uw-beaver!cornell!rochester!udel!haven.umd.edu!mimsy!mojo.eng.umd.edu!stripes
References: <26521@beta.gov>

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From: stripes@eng.umd.edu (Joshua Osborne)
Newsgroups: comp.windows.x
Subject: Re: visual classes
Keywords: TrueColor, StaticColor
Message-ID: <1991Jun28.202530.15560@eng.umd.edu>
Date: 28 Jun 91 20:25:30 GMT
References: <26521@beta.gov>
Organization: College of Engineering, Maryversity of Uniland, College Park
Lines: 39