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From: ali@polya.Stanford.EDU (Ali T. Ozer)
Newsgroups: comp.sys.amiga,comp.sys.amiga.tech
Subject: Re: MINTERM_SWAP?
Keywords: MINTERM graphics how
Message-ID: <5470@polya.Stanford.EDU>
Date: 4 Dec 88 18:00:40 GMT
References: <1576@nmtsun.nmt.edu> <5469@polya.Stanford.EDU>
Reply-To: aozer@NeXT.com
Organization: Stanford University
Lines: 13

I just wrote:
>In article <1576@nmtsun.nmt.edu> William Norris writes:
>>Is there a simple way to swap two bitmaps without a third temporary bitmap?
>Yes, but you need to do multiple blits. ...

Let me point out that on a 4-bitplane, 640x400 screen, swapping the
whole screen using the three-XOR BltBitMap method takes a small but
visible fraction of a second. For my purposes, it doesn't matter;
it might in some real-time game or something. Actually, the visual
effect is kind of neat as the bitmaps are XORed in and out in front 
of your eyes --- some sort of metamorphosis.

Ali Ozer