Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!kuhub.cc.ukans.edu!2fmlcalls
From: 2fmlcalls@kuhub.cc.ukans.edu
Newsgroups: comp.sys.mac.programmer
Subject: Faster than CopyBits?
Message-ID: <1991Mar26.184550.29306@kuhub.cc.ukans.edu>
Date: 26 Mar 91 18:45:50 CST
Organization: University of Kansas Academic Computing Services
Lines: 22

What is the quickest way to blast bits to the screen?

I'm aware of CopyBits long and shortcomings and I thought (know) there must be
a better way.
First, is drawing into a bitmap as opposed to an offscreen port quicker?
If you know that the size of the source and dest (and they are the same size
and have a width on a word boundary) and you also know that the dest needs no
clipping (will appear entirely on the screen) - is there not a faster method
than CopyBits?  Assume as well that srcCopy is the only transfer mode you need.

I've considered BlockMove from ptr to ptr grabbing the appropriate number of
bytes.  Anyone have experience doing this?

I've dreamed about page-flipping as well, but is it possible to do it on all
models of the Mac?  It seems as though you should be able to just maintain two
screen-sized windows (a and b) and just bounce a pointer back and forth for
screenmemory's address.  Why isn't this possible?

Sorry, to bother everyone with this probably-age-old-question.  I would be
indebted to any help.

john calhoun