ROY RUDDLE (saprar++at++thor.cf.ac.uk)
Wed, 20 Mar 1996 12:54:48 +0000 (GMT)
I'm playing around with 2 viewport configurations, both displayed on a
single 1280x1024 monitor:
a) 1 viewport (1280x1024), or
b) 2 viewports, 1024x1024 and 256x256. The small viewport is situated at
the right hand side of the screen, which means that the two viewports DO
NOT overlap.
When displayed (a) is OK, but (b) occasionally has flashes in a band near
the top of the large viewport.
However, if I change the large viewport in (b) to be 1280x1024 then the
flashes go away (the small viewport is now SUPERIMPOSED on top of the
large viewport).
In my original version of (b), some parts of the channel are not covered
by a viewport (the top RHS and the bottom RHS). This appears to be
causing the problem.
... so the question is: is this a bug in Performer?, or am I doing
something illegal (in which case is there a workaround which doean't
involve creating a 'background' viewport)?
cheers
roy
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