Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!sun-barr!decwrl!shelby!polya!lipa
From: lipa@polya.Stanford.EDU (William J. Lipa)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Slightly more elaborate offscreen bitmap prob.
Message-ID: <10852@polya.Stanford.EDU>
Date: 25 Jul 89 07:08:06 GMT
References: <14324@swan.ulowell.edu> <1240@uvm-gen.UUCP>
Sender: William J. Lipa <lipa@Polya.Stanford.EDU>
Reply-To: lipa@Polya.Stanford.EDU (William J. Lipa)
Organization: Stanford University
Lines: 17

Just as a reminder, there is a Sample Code offering from Apple which is an
offscreen bitmap package. This might provide a good example to look at. It's
on sumex-aim.stanford.edu under /info-mac/apple/code and also at apple.com.

I quote:

These routines provide a high-level interface to the QuickDraw and Color Manager
routines which allow the creation and manipulation of off-screen bitmaps and
pixel maps.  They are designed to run on any machine with 128K or later ROMs
(sorry 64K ROM fans).

Note that the design incorporates the idea that you can go along pretending
there is an off-screen buffer, even when one could not be allocated, and the
calls will do nothing.


Bill