Path: utzoo!censor!geac!torsqnt!lethe!yunexus!ists!helios.physics.utoronto.ca!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!rpi!masscomp!peora!tarpit!osceola.cs.ucf.edu!ssd
From: ssd@engr.ucf.edu (Steven S. Dick)
Newsgroups: comp.windows.x
Subject: What is visible?
Summary: asking the server about exposure
Message-ID: <1991Jan24.140821.19001@osceola.cs.ucf.edu>
Date: 24 Jan 91 14:08:21 GMT
Sender: news@osceola.cs.ucf.edu (Network News)
Organization: engineering, University of Central Florida, Orlando
Lines: 13

I have an application for which drawing the window is computationally
expensive, so I'd like to be able to draw the smallest amount
possible--in other words, only the visible portions.

Currently, the program triggers off of expose events, and draws each part
as it is exposed.  Unfortunately, the program must periodically redraw
the window from scratch.  When this becomes necessary, I have to guess
what portions of the window are visible.

Is there a way to ask the server what parts of the window are visible?

	Steve
ssd@engr.ucf.edu