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From: battle@alphard.cs.utk.edu (David Battle)
Newsgroups: comp.windows.x
Subject: Bug in DECStation 3100 X server
Summary: XGetImage on pixmaps with certain image sizes MODIFIES the PIXMAP!
Message-ID: <1499@utkcs2.cs.utk.edu>
Date: 13 Dec 89 21:57:52 GMT
Sender: news@utkcs2.cs.utk.edu
Reply-To: battle@alphard.cs.utk.edu (David Battle)
Organization: CS Dept -- University of TN, Knoxville
Lines: 11

There appears to be a bug in DEC's X server for the DECStation 3100.  Try
an XGetImage from a pixmap with the image's width and height equal to 33.

At least under some circumstances this can cause garbage to be *written* into
the *pixmap*.  Changing the GetImage size from 33 to 32 will "fix" the problem.

I don't know if this bug exists on other servers.  I haven't observed this
problem with windows, but that doesn't mean it doesn't exist there also.

					-David L. Battle
					battle@battle.esd.ornl.gov