Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!usc!zaphod.mps.ohio-state.edu!van-bc!rsoft!mindlink!a464
From: a464@mindlink.UUCP (Bruce Dawson)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Double-Buffering in a window
Message-ID: <885@mindlink.UUCP>
Date: 2 Jan 90 06:01:43 GMT
Organization: MIND LINK! - British Columbia, Canada
Lines: 13


     Screens are hardware entities, consisting of a set of rectangular (as
rectangular as a linear chunk of memory can be) bit planes.  They can be moved
by adjusting pointers into the copper list so as to adjust pointers in the
display chip.

     Windows are software entities.  The illusion of hidden portions of windows
and the ability to move windows around is done completely by the grunt method
of picking up data and moving it, and storing hidden stuff off screen.  So no,
you can't double buffer a window by changing pointers.  Some graphics chips let
you have hardware windows, but not the Amiga's.

.Bruce.