Path: utzoo!attcan!uunet!lll-winken!ncis.llnl.gov!helios.ee.lbl.gov!ux1.lbl.gov!beard
From: beard@ux1.lbl.gov (Patrick C Beard)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Text Drawing at speeds greater than 1200baud
Message-ID: <1728@helios.ee.lbl.gov>
Date: 20 Jan 89 20:08:30 GMT
References: <2243@uokmax.UUCP> <27572@ucbvax.BERKELEY.EDU> <24307@apple.Apple.COM>
Sender: usenet@helios.ee.lbl.gov
Reply-To: beard@ux1.lbl.gov (Patrick C Beard)
Organization: Lawrence Berkeley Laboratory, Berkeley
Lines: 17

In article <24307@apple.Apple.COM> parent@Apple.COM (Sean Parent) writes:
>In article <27572@ucbvax.BERKELEY.EDU>, oster@dewey.soe.berkeley.edu (David Phillip Oster) writes:
>> (o) if and only if the destination is a 1-bit deep pixmap, completely
>> visible, the front window, and un-obscured by other windows, than do the
>> following ultra-fast code. Otherwise, use the DrawText solution you've
>> already been told about.
>
>There is no way to tell for sure that there are not any windows in front of
>your window. The system owns the screen.

Not true.  It is very easy.  Just look at the visRgn of the window in
question.  Clip your optimized drawing directly to the screen to this and
you won't get in trouble.  I know, I've done it.  It is dirty pool, but
it does work.

Patrick Beard
Berkeley Systems, Berkeley CA