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From: grunwald@foobar.colorado.edu (Dirk Grunwald)
Newsgroups: comp.windows.x
Subject: Re: ghostscript2.0 (was Re: fix to font cacheing in ralpage postscript viewer)
Message-ID: <26285@boulder.Colorado.EDU>
Date: 14 Sep 90 19:05:42 GMT
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	<JUHA.90Sep13152309@octopus.tds.kth.se> <26192@boulder.Colorado.EDU>
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In-reply-to: moraes@cs.toronto.edu's message of 14 Sep 90 06:08:12 GMT


One thing that gs2.0 X previewer does do it paint to both a pixmap and
the display.  That's kind of redundant, but prompts the question
(which will show my X ignorance):

How does one making ones own backing pixmap that works like backingstore?

E.g., I can specify a backing pixmap for a window, but if portions of
that window are obscured, the backing pixmap isn't painted properly.
Likewise, I can paint into a pixmap and update the window with the
pixmap.  This then requires hueristics to determine how often to
update the window.

I've been wondering how to specify this for some time. I ran into this
in 'texx' eons ago.