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From: keithd@cadovax.UUCP (Keith Doyle)
Newsgroups: comp.sys.amiga
Subject: Re: BltMaskBitMapRastPort
Message-ID: <1697@cadovax.UUCP>
Date: Tue, 18-Aug-87 17:26:14 EDT
Article-I.D.: cadovax.1697
Posted: Tue Aug 18 17:26:14 1987
Date-Received: Sat, 22-Aug-87 10:17:12 EDT
References: <1702@amiga.amiga.UUCP> <6978@steinmetz.steinmetz.UUCP> <1692@cadovax.UUCP> <493@rocky.STANFORD.EDU>
Reply-To: keithd@cadovax.UUCP (Keith Doyle)
Organization: Contel Business Systems, Torrance, CA
Lines: 18

In article <493@rocky.STANFORD.EDU> rokicki@rocky.UUCP (Tomas Rokicki) writes:
>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.

Are you saying that it is not possible to do an arbitrary rectangle
*copy* with a *mask plane* in a single operation because of this?  
If so, that's a 2 and 2 I hadn't put together yet.  Couldn't A be
a mask plane and serve to both mask out the edges of the rectangle, 
as well as acting as a 'shape' mask for the object being copyied?

Inquiring minds want to know.

Keith Doyle
#  {ucbvax,decvax}!trwrb!cadovax!keithd
#  cadovax!keithd@ucla-locus.arpa  Contel Business Systems 213-323-8170