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From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: Re: Blitter
Message-ID: <8612071926.AA10666@cory.Berkeley.EDU>
Date: Sun, 7-Dec-86 14:26:57 EST
Article-I.D.: cory.8612071926.AA10666
Posted: Sun Dec  7 14:26:57 1986
Date-Received: Sun, 7-Dec-86 21:15:17 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: University of California at Berkeley
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	Are you sure your using just one blit?  Note that one graphics
call does not constitute one blit... It all depends on the number of planes
in your source image.  If your source image has 4 planes, then that one
graphics call is going to do at least 4 blits.  Additionaly, each blit
pass may have more than one source ... in fact, up to three.

	For instance, if you are blitting a 4 plane source image to a
destination through a mask, each of the 4 blitter passes will have 2 sources
and one destination (you can only have one destination).

	It all boils down to how many colors you want in your source image.
If it's only one color, you can define it in only one plane.  If its 2 to 4
colors, it takes two planes.  This has nothing to do with the number of planes
on the screen (assuming there are enough).

	As an ending note: Sometimes you can forget the mask by putting
the background in one plane and the animation on another.

					-Matt