Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!mcsun!sunic!tut!utu.fi!sutela
From: sutela@utu.fi (Kari Sutela)
Newsgroups: comp.sys.amiga.tech
Subject: Clipping? Questions and recommendations.
Message-ID: <1990Mar3.110330.6134@utu.fi>
Date: 3 Mar 90 11:03:30 GMT
Organization: University of Turku, Finland
Lines: 19

Basically, I'd like to see your opinions on the best method for performing
clipping. I understand Intuition windows perform clipping automatically. Is
this true regardless of the window type (SIMPLEREFRESH etc.)?

I guess, the simplest method would be using a GZZ-window, but the manuals
say something about performance disadvantages. Anyway, for this application,
I'd like to provide zooming, so I must be able handle some kind of refreshing
and resizing. So, a SIMPLEREFRESH window would do just as well. But I don't
want to perform software clipping, and I don't know how to define a clipping
region (I don't want to draw all over the window borders). I have read the
old Libraries&Devices (the new one isn't available in Finland, yet) but,
to be honest, I didn't quite understand the part about clipping regions.

Should I just take the easy way out and use GZZ-windows or do they really
cause a significant performance decrease? Any help (a small example) on
clipping regions would also be nice.

- Kari Sutela	sutela@polaris.utu.fi OR sutela@kontu.utu.fi OR
		sutela@tucos.utu.fi