Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!gem.mps.ohio-state.edu!ginosko!uunet!mcsun!inria!irisa!boissier
From: boissier@irisa.irisa.fr (franck boissiere,externes )
Newsgroups: comp.sys.mac.programmer
Subject: Re: Usefulness of off-screen ports (was: turning on a pixel)
Message-ID: <1403@irisa.irisa.fr>
Date: 25 Aug 89 14:55:39 GMT
References: <1357@speedy.mcnc.org>
Sender: news@irisa.irisa.fr
Lines: 17

From article <1357@speedy.mcnc.org>, by kk@mcnc.org (Krzysztof Kozminski):
> One more thing it may do is to speed up the screen refresh times.  From
> my experiments, drawing rectangles and line segments into a bitmap that
> has rectangular clipRgn and visRgn is ~30% faster than doing the same
> drawing into a bitmap with either of these regions composed of two
> abutting rectangles (as you're likely to have if your window has its
> corner overlapped by another window).
>a
Does  anyone know how  clipping is handled for non rectangular clipRgn?
Is it divied into  a collection of rectangles?

Franck
 
Franck BOISSIERE                        boissier@irisa.irisa.fr
Prototyping Lab Manager                 boissier@ccettix.UUCP
C.C.E.T.T.   B.P. 59                    boissier%irisa.irisa.fr@uunet.uu.net
35512 CESSON SEVIGNE CEDEX  FRANCE