Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!cbmvax!chrisg
From: chrisg@cbmvax.commodore.com (Chris Green)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: best way to reverse a bitplane?
Message-ID: <21107@cbmvax.commodore.com>
Date: 1 May 91 14:07:35 GMT
References: <1991Apr29.101302.1@atmo2.atmo.arizona.edu>
Reply-To: chrisg@cbmvax.commodore.com (Chris Green)
Organization: Commodore, West Chester, PA
Lines: 16

In article <1991Apr29.101302.1@atmo2.atmo.arizona.edu> leuthold@atmo2.atmo.arizona.edu writes:
>What is the best way to reverse a bitplane?  A brute force method would be 
>to reverse the bytes and then reverse the bits in each byte.  The only way I
>can think of to reverse the bits in each byte is to mask each bit off then
>shift it to its new place and add it to the new byte.  Is there a better way?


	You want a 256 byte table for the bit reversal. A 64K table if you REALLY
need it to be fast.
-- 
*-------------------------------------------*---------------------------*
|Chris Green - Graphics Software Engineer   - chrisg@commodore.COM      f
|                  Commodore-Amiga          - uunet!cbmvax!chrisg       n
|My opinions are my own, and do not         - killyouridolssonicdeath   o
|necessarily represent those of my employer.- itstheendoftheworld       r
*-------------------------------------------*---------------------------d