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Re: gamegrid.el and some games

From: Oliver Scholz
Subject: Re: gamegrid.el and some games
Date: Fri, 20 Sep 2002 02:26:37 +0200
User-agent: Gnus/5.090008 (Oort Gnus v0.08) Emacs/21.3.50 (i686-pc-linux-gnu)

Richard Stallman <address@hidden> writes:

[black-and-white displays]

> It is possible that no such displays have been built in recent years.
> gamegrid.el should do SOME kind of Right Thing on those displays, but
> pretending they cannot draw images might be good enough.

I see.

> Converting XPM to PPM seems useful, because with this, we can arrange
> that Emacs can always display XPM format.  That makes the API specs
> simpler.  It would be nice if Emacs always used this conversion method
> when you try to display an XPM and the support is not built in.

O.K. I am working on it. 

> But why do you prefix this with "if not"?  I know very very little
> about these graphics formats, so it isn't obvious to me why this
> method would depend on being able to display more than just black and
> white.  Can you explain?

I know nothing about graphical black&white displays. I assume -- but
this is just a wild guess -- that on such a display _every_ coloured
pixel appears as black. I fear that this could lead to the end that
you have to play tetris or snake with black squares on a black
background, which makes it unnecessarily difficult.

So I agree that it's best and safest to use simple ascii-chars on
displays for which

(and (display-images-p) 
     (not (or (display-color-p)

is t.

    -- Oliver

Oliver Scholz               Jour du Travail de l'Année 210 de la Révolution
Taunusstr. 25               Liberté, Egalité, Fraternité!
60329 Frankfurt a. M.       http://www.jungdemokratenhessen.de
Tel. (069) 97 40 99 42      http://www.jdjl.org

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