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Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!uunet!bu.edu!polygen!bill
From: bill@polygen.uucp (Bill Poitras)
Newsgroups: comp.windows.x,comp.sys.ibm.pc.misc
Subject: Re: PC X servers / backing store
Message-ID: <998@redford.UUCP>
Date: 4 Mar 91 18:26:06 GMT
References: <1991Feb19.152725.24673@ucthpx.uct.ac.za>
Reply-To: bill@redford.UUCP (Bill Poitras(X258))
Organization: Polygen Corporation, Waltham, MA
Lines: 29

In article <1991Feb19.152725.24673@ucthpx.uct.ac.za> fsg@ucthpx.uct.ac.za (Fred S. Goldstein) writes:
>A problem encountered with both products is that if a graphics window
>is overlaid ( e.g. by a menu ), the overlaid portion is not restored.
>The suppliers of Grafit informed me that the X server implementation
>probably did not support backing store  - a requirement for their 
>package ( or for the HP Starbase/X implementation? ).
>
Just for your information, what you just described above is not backing
store but save unders.  Backing store works when anything BUT a menu
which obscures another window is moved so the current window is exposed.

>I have just received a third test package - XVISION - and the documents
>state that it, too, does not support backing store.
>
>Does anyone know of a PC X server product that supports backing store??
Yes.  Try PC-Xview from Spectragraphics/Graphics Software Systems.  The
current version is 2.1.  The EGA/VGA version of the server supports
backing store.  The DGIS version doesn't.  According to GSS, PC-Xview 2.2
will support backing store in its DGIS version.  It it due out sometimes
after the end of March.  GSS can be reached at (503)641-2200.  Let me
know if you have any other questions about this server.  It is the best I
have seen so far.  I have PC-Xsight, PC-Xview, X11/AT, and XVision.


+-----------------+---------------------------+-----------------------------+
| Bill Poitras    | Polygen Corporation       | {princeton mit-eddie        |
|     (bill)      | Waltham, MA USA           |  bu sunne}!polygen!bill     |
|                 | FAX (617)890-8694         | bill@polygen.com            |
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