Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!yale!mintaka!bloom-beacon!CONVEX.COM!salevin%drlc1
From: salevin%drlc1@CONVEX.COM (S. A. Levin[Stewart])
Newsgroups: comp.windows.x
Subject: Plane masks on Sun servers
Message-ID: <9001181859.AA00297@drlc1>
Date: 18 Jan 90 18:59:19 GMT
Sender: root@athena.mit.edu (Wizard A. Root)
Organization: The Internet
Lines: 23


   
I have been working with an application that uses plane masks to
allocate 6 planes for image plus 1 plane for overlay.  (For my
convenience, I use contiguous colormap cells.)  The application
adds and erases the overlay information by enabling only the overlay
mask, writing 1 or 0 as appropriate into that plane, disables the
overlay mask and reenables the image planes.

When pointed at DecStation, VAXStation, or Tektronix Xterminal, the
behavior is correct.

When pointed at a Sun station (3/60, 3/260, SparcStation running 3.4,
3.5 or 4.0 OS) the overlay appears, but does not go away when 0 is
written back into the overlay (or another 1 under Xor).  This occurs
under the MIT X-11.3 server and the OpenWindows/xnews 1.0 server
(with or without FCS, whatever that is).

Has anyone seen the same problems using plane masks?
Does anyone know of a cure?
Will the problem disappear with R4?

Reply to: stew@hanauma.stanford.edu