Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!bryan
From: bryan@cs.utexas.edu (Bryan Bayerdorffer @ Wit's End)
Newsgroups: comp.sys.amiga.tech
Subject: Re: swapping bitmaps using the blitter and not using temporary space
Message-ID: <334@mohawk.cs.utexas.edu>
Date: 22 Apr 89 02:49:43 GMT
References: <8904212115.AA19128@hermes.berkeley.edu>
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In article <8904212115.AA19128@hermes.berkeley.edu> dillon@HERMES.BERKELEY.EDU (Matt Dillon) writes:
=-
=-	bitmap's A and B
=-
=-	A = A ^ B
=-	B = B ^ A	(B = B ^ A ^ B = A)
=-	A = A ^ B	(A = A ^ B ^ A = B)
=-
=-					-Matt

	Or (Xor?), for that matter,

	A = A xor B
	B = A xor B
	A = A xor B

Now let's all recite swap() {a = a+b; b = a-b; a = a-b;} for the zillionth time.
:-) :-)

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