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From: toddpw@tybalt.caltech.edu (Todd P. Whitesel)
Newsgroups: comp.sys.apple2
Subject: Re: offscreen grafports in Orca/Pascal
Message-ID: <1990Aug10.154457.17376@laguna.ccsf.caltech.edu>
Date: 10 Aug 90 15:44:57 GMT
References: <3980@rex.cs.tulane.edu> <43826@apple.Apple.COM>
Sender: news@laguna.ccsf.caltech.edu
Organization: California Institute of Technology
Lines: 15

dlyons@Apple.COM (David A. Lyons) writes:

>In summary, you need to allocate memory for the off-screen pixel map,
>open a new grafport by calling OpenPort on a 170-byte chunk of memory,
>and use SetLocInfo to set up the locInfo record of your grafport to
>refer to your pixel map.

WHOA... is that 170 GUARANTEED or is there a better way to do it that doesn't
require us to hard-code how big the grafport record should be?

I loath hardwiring constants into my program and I prefer to avoid it whenever
possible.

Todd Whitesel
toddpw @ tybalt.caltech.edu