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From: lsr@apple.UUCP (Larry Rosenstein)
Newsgroups: comp.sys.mac
Subject: Re: How do you create an offscreen bitmap > screen.bounds
Message-ID: <1591@apple.UUCP>
Date: Mon, 24-Aug-87 12:53:44 EDT
Article-I.D.: apple.1591
Posted: Mon Aug 24 12:53:44 1987
Date-Received: Tue, 25-Aug-87 05:50:22 EDT
References: <11505@decwrl.DEC.COM>
Reply-To: lsr@apple.UUCP (Larry Rosenstein)
Organization: Advanced Technology Group, Apple Computer
Lines: 22

In article <11505@decwrl.DEC.COM> cassidy@memory.dec.com (SHR1-3/O11..DTN 237-3413) writes:
>Can anyone tell me how to draw into an offscreen bit map that is larger
>than screen.bounds?  The default VisRgn is screen.bounds, and DrawPicture
>clips to this region.  Any way to change the VisRgn legally?  Thanks.

If the port is off screen, then there is no reason why you can't change the
visRgn yourself.  Do something like: RectRgn(port.visRgn, port.PortRect);  

You should not do this for ports that are on the screen (eg, windows), since
maintaining the visRgn is the responsibility of the Window Manager.  For
offscreen bitmaps, you have to assume this responsibility, since the Window
Manager won't help you.

-- 
Larry Rosenstein

Object Specialist
Apple Computer

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