Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!hplabs!hpfcso!stroyan
From: stroyan@hpfcso.HP.COM (Mike Stroyan)
Newsgroups: comp.windows.x
Subject: Re: No expose after map if backing store?
Message-ID: <7320012@hpfcso.HP.COM>
Date: 17 Jan 91 17:08:13 GMT
References: <1658@rrzbu.UUCP>
Organization: Hewlett-Packard, Fort Collins, CO, USA
Lines: 15

>    As anybody knows, before drawing to a window just mapped one has to wait
>    for an exposure event. Fine.
>
>    But why does the program below hang on R4 servers with backing store
>    and runs fine on servers without?
>
>    Do I really have to ask the server if it will maintain backing store
>    before doing the XNextEvent() or is it a bug in the server?

I suggest that rather than just asking for ExposureMask you also ask for
StructureNotifyMask and proceed after a MapNotify event.  Asking for
ExposureMask is still a good idea since the server may generate
exposures instead of offering backing store.

Mike Stroyan, mike_stroyan@fc.hp.com