Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wasatch!cs.utexas.edu!uunet!sco!jamesm
From: jamesm@sco.COM (James M. Moore)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Help with LSC 3.0 CopyBits
Message-ID: <2852@viscous.sco.COM>
Date: 3 May 89 20:47:04 GMT
References: <7731@zodiac.UUCP> <741@rocksanne.UUCP>
Reply-To: jamesm@sco.COM (James M. Moore)
Organization: The Santa Cruz Operation, Inc.
Lines: 18

In article <741@rocksanne.UUCP> rainero@prism.UUCP (Emil Rainero) writes:
>I also recall reading that CopyBits wants at most 32K of data. (might want
>to read the IM V.1 section on CopyBits.

Actually, it says that the Quickdraw convention is to not use more
than 3k of stack space.  I presume that's to avoid possible stack
overflows.  My question:  how does one find out what the bottom of the
stack should be?  Seems like you could just check A7 against that
number, and if there's room go ahead and copy more than 3k.  I've been
copying the entire screen in one pass, and haven't noticed any
problems (about 18k per copybits call).


-- 
** James Moore **
** Internet:  jamesm@sco.com **
** uucp:  {decvax!microsoft | uunet | ucbvax!ucscc | amd}!sco!jamesm **
** Nil clu no suim ar bith ag SCO ceard a bhfuil me ag scriobh anois. **