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From: russotto@eng.umd.edu (Matthew T. Russotto)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Large Offscreen Drawing - help please
Message-ID: <1990Nov20.180305.6813@eng.umd.edu>
Date: 20 Nov 90 18:03:05 GMT
References: <11722@hubcap.clemson.edu> <27010.2748125d@kuhub.cc.ukans.edu>
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In article <27010.2748125d@kuhub.cc.ukans.edu> mlab2@kuhub.cc.ukans.edu writes:

>I'll second that problem.
>I've noticed that the largest size I've been able to attain is 512x342.  Sound
>familiar?  It's the size of my Plus's screen.
>So, in creating the port, it occurred to me maybe I need to allocate a size
>larger that GrafPort.  So, when I created the port, I added some large number
>to the size.  No go.
>Perhaps the port size needs to be told it's larger.  A call to PortSize was a
>no go as well.
>Clipping rect perhaps?  Expanded that.  No.
>What are we missing?  VisRgn? 

Bingo.

VisRgn is honored for offscreen ports, contrary to IMI, so when you
create a port, after the normal port creation calls:
SetRectRgn(p->visRgn, p->portRect);
--
Matthew T. Russotto	russotto@eng.umd.edu	russotto@wam.umd.edu
     .sig under construction, like the rest of this campus.