Path: utzoo!mnetor!uunet!husc6!rutgers!ames!ucbcad!ucbvax!BU-CS.BU.EDU!bzs
From: bzs@BU-CS.BU.EDU (Barry Shein)
Newsgroups: comp.windows.x
Subject: Damage repair event on root window?
Message-ID: <8712202121.AA16639@bu-cs.bu.edu>
Date: 20 Dec 87 21:21:12 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 33


System: Sun3/160, SunOS 3.4, X11R1 patches thru the 30s somewhere

Problem:

	I am trying to do an XGetImage() of the area under a window,
	strategy was: Unmap, XGetImage of root corresponding to area,
	re-map.

	It's unpredictable whether I get a still-damaged area or not.

	So: Try various events on the root-window, no luck, can get them
	but none seem to indicate that damage repair has completed.

	Then: Try napping for a short period (1/10 second), that works
	fine but obviously the wrong way to go.

Questions:

	Is the approach crocked (unmapping then XGetImage of root)?

	Better way? A way to delay the XGetImage till damage repair
	is complete? Or am I being bitten by a bug of some sort (that
	is, if you think it *should* have worked otherwise just tell
	me, bugs I can deal with, conceptual problems are a whole 'nother
	can-o-worms.)

		-Barry Shein, Boston University

P.S. If you must know I was just playing with various calls in
preparation for a larger project. This program acts as a magnifying
glass on the bits under the window. Just cute mostly, but I do need
the underlying operations later.