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From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: Re: where is SetDrPt ?  Why SetA/BPen() are not macros.
Message-ID: <8709160238.AA27229@cory.Berkeley.EDU>
Date: Tue, 15-Sep-87 22:38:01 EDT
Article-I.D.: cory.8709160238.AA27229
Posted: Tue Sep 15 22:38:01 1987
Date-Received: Fri, 18-Sep-87 04:22:58 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
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>	And now a question to the wizards at C-A (this means you, Dale!):
>Whyzzit that SetDrPt(), SetOPen() et al are macros, but SetAPen() and
>SetBPen() are real library calls?  Further, when I tried turning SetAPen()
>into a macro many moons ago as an experiment, things broke left and right.
>What exactly does SetAPen() do that prevents its existence as a macro?

	SetAPen() recalculates the blitter minterms.... kinda hard to do in
a macro.  (I think, but am not sure, that these minterms are the 
RPORT->minterms array).

	Now I have a question....  I can use the RP_User field in the 
rastport structure for whatever I want, right?  When I'm simulating a
rastport, is it ok to leave the Layer field NULL? (assume I don't care about
clipping).  Finally, does the Mask field effect minterm generation? E.G.
Should I do a SetAPen() after I change the Mask field?

				-Matt