Path: utzoo!attcan!uunet!mcvax!guido
From: guido@cwi.nl (Guido van Rossum)
Newsgroups: comp.windows.x
Subject: save-under bug?
Message-ID: <8116@boring.cwi.nl>
Date: 16 May 89 15:24:34 GMT
Sender: news@cwi.nl
Reply-To: guido@cwi.nl (Guido van Rossum)
Organization: The Royal Society for Prevention of Cruelty to Amoebae
Lines: 23

I have an application (a hacked version of the stdwin bitmap editor)
which can create a huge window (an expanded view of the bitmap, where
each bit is blown up to size NxN) which is a subwindow of a much smaller
window (the viewport).  I am not using backing store, but I have
pull-down menus with save-unders.  When the bitmap window is very large
(although only a small size of it is visible, due to the clipping to the
parent), there is a noticeable delay when I open a menu (up to half a
minute).  This makes me think that the save-under code somehow saves the
entire window (even that part which is invisible!), rather than only the
part below the menu.  Could this be:

	- a server bug?
	- required by the protocol?
	- a figment of my imagination?
	- fixed in R4?
	- all of the above?

Oh yeah, this is X11R3 (MIT server and library) with few patches on a
VS2000 running Ultrix 2.2.  The application uses only Xlib, not Xt.
--
Guido van Rossum, Centre for Mathematics and Computer Science (CWI), Amsterdam
guido@cwi.nl or mcvax!guido or guido%cwi.nl@uunet.uu.net
"Repo man has all night, every night."