Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!bloom-beacon!EXPO.LCS.MIT.EDU!keith
From: keith@EXPO.LCS.MIT.EDU
Newsgroups: comp.windows.x
Subject: Re: Using backing store from Xt?
Message-ID: <8907141746.AA10295@xenon.lcs.mit.edu>
Date: 14 Jul 89 17:46:48 GMT
References: <8907141443.AA13412@LYRE.MIT.EDU>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
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> The deal is that each widget class which believes that backing store
> might be useful for it has to add the resource.  (How would you like
> your swap space filled up with backing store for Shells, Boxes, Forms,
> and Viewports?).

The MIT sample server only creates off-screen bitmaps for windows which
are drawn to; Shells, Boxes, Forms and Viewports are never drawn to and
will not get a pixmap.  It isn't free, but it's not as expensive as you
make it out to be.  We frequently use the -wm option to the server which
adds WhenMapped backing store to every window on the screen.

Keith Packard
MIT X Consortium