Path: utzoo!attcan!uunet!mcsun!unido!mpirbn!p554mve
From: p554mve@mpirbn.UUCP (Michael van Elst)
Newsgroups: comp.sys.amiga
Subject: Re: Amiga mentality
Message-ID: <893@mpirbn.UUCP>
Date: 11 Apr 90 19:51:05 GMT
References: <16296@snow-white.udel.EDU> <11059@bsu-cs.bsu.edu> <6647@wehi.dn.mu.oz> <3452@newton.physics.purdue.edu>
Reply-To: p554mve@mpirbn.UUCP (Michael van Elst)
Organization: Max-Planck-Institut fuer Radioastronomie, Bonn
Lines: 17

In article <3452@newton.physics.purdue.edu> sho@maxwell.physics.purdue.edu.UUCP (Sho Kuwamoto) writes:
>When windows are obscured on the Amiga, does the OS keep around a
>bitmap of the covered area, or is the program responsible for
>remembering what was there?  The mac uses the latter technique which
>saves on memory, but loses on speed.

Now, with the Amiga OS (ala, Intuition). You have both options.
You can say, the OS should save the bitmap. Or you can say, the application
should redraw the window.
You can notice this with the workbench windows. They are much slower than
shell windows since the workbench process has to redraw each icon.
Or better, the workbench process is slow when refreshing these :-)
An optimized refresh routine could be nearly as fast.

-- 
Michael van Elst
p554mve@mpirbn.mpifr-bonn.mpg.de