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From: rokicki@rocky.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: BltMaskBitMapRastPort
Message-ID: <493@rocky.STANFORD.EDU>
Date: Sat, 15-Aug-87 16:01:57 EDT
Article-I.D.: rocky.493
Posted: Sat Aug 15 16:01:57 1987
Date-Received: Sun, 16-Aug-87 09:46:44 EDT
References: <1702@amiga.amiga.UUCP> <6978@steinmetz.steinmetz.UUCP> <1692@cadovax.UUCP>
Reply-To: rokicki@rocky.UUCP (Tomas Rokicki)
Organization: Stanford University Computer Science Department
Lines: 18

$ BTW, while we're talking about blitter routines, has anyone written
$ or seen the source to a complete general purpose arbitrary rectangle
$ blit routine?

Well, BlitLab on fish disk 84 has a description of how one would work,
down to all the nitty gritty details of shifts and everything.  Coding
one up from the description shouldn't be too difficult.

Please note that an arbitrary rectangle *copy* requires all three
sources and the destination---A to mask out the edges of the
rectangle, B to fetch the source, C to fetch the destination, and
D to write the destination.  You could change minterms or a few
other things, but not too much more.

If I get a few demands, I'll write that general purpose copying
routine and post it . . .

-tom