Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!apple!AppleLink.Apple.Com!Greg
From: Greg@AppleLink.Apple.Com (Greggy)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Slightly more elaborate offscreen bitmap prob.
Message-ID: <3101@internal.Apple.COM>
Date: 25 Jul 89 23:33:11 GMT
Sender: usenet@Apple.COM
Organization: Apple Computer, Inc.
Lines: 26
References:<14324@swan.ulowell.edu> <1240@uvm-gen.UUCP>

In article <1240@uvm-gen.UUCP> chaffee@uvm-gen.UUCP (Alex D. 
Chaffee,,,6581273) writes:
> If I remember right, Inside Mac (I, p.149) is wrong; the default ClipRgn 
is
> set to the screen.  Try putting a ClipRect(&meterRect) in your creation 
code.
> For good measure, also do RectRgn(...->visRgn, &meterRect).

Well, you don't remember right.  Inside Mac is correct, the clipRgn is set 
to a very large area.  It's the visRgn that is set to the screen (as 
stated in the OpenPort description on Vol. I, p. 163-4).  You only need to 
change the visRgn for things to behave properly.  A side note, however: 
set the clip down too, so picture recording and playback don't exhibit 
unexpected behavior.  Having a wide open clip rgn often results in 
overflow during scaling on playback.  The result is an empty clip rgn and 
nothing gets drawn!  (see. TechNote #59)

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  + Greg Marriott               +                    AppleLink: Greg +
  + Just Some Guy               +                                    +
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  + (408)974-busy                                                    +
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