Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!dewey.soe.berkeley.edu!oster
From: oster@dewey.soe.berkeley.edu (David Phillip Oster)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Wide offscreen bitmap won't receive draw commands
Message-ID: <30755@ucbvax.BERKELEY.EDU>
Date: 19 Aug 89 08:02:26 GMT
References: <22321@andante.UUCP>
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: oster@dewey.soe.berkeley.edu.UUCP (David Phillip Oster)
Organization: School of Education, UC-Berkeley
Lines: 18

In article <22321@andante.UUCP> bwb@andante.UUCP (Bruce Ballard) writes:
>What am I missing?

If you read QuickDraw in Inside Mac, vol. 1, it will tell you that when
you create a new grafport, the clipRgn gets initialized to wide open, and
the visRgn gets initialized to screenBits.bounds. Big off-screen grafports
should probably do a:
	ClipRect(&thePort->portRect);
	RectRgn(thePort->visRgn, &thePort->portRect);
before drawing on it.
--- David Phillip Oster      7 line signature follows
Keith Sproul, head of microcomputer support at Union Carbide, NJ, complained
about the poorly digitized fellatio on an IBM porno program. "Mac is better
on everything, and this is no execption."  -- "Computer Porn at the Office"
by Reese Erlich, _This_World_, S.F. Chronicle, p.8, Aug 13, 1989

Arpa: oster@dewey.soe.berkeley.edu
Uucp: {uwvax,decvax}!ucbvax!oster%dewey.soe.berkeley.edu