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From: leavens@atari.UUCP (Alex Leavens)
Newsgroups: comp.sys.atari.st
Subject: Re: Help! vro_cpyfm,vrt_cpyfm
Message-ID: <672@atari.UUCP>
Date: Wed, 18-Mar-87 14:05:15 EST
Article-I.D.: atari.672
Posted: Wed Mar 18 14:05:15 1987
Date-Received: Fri, 20-Mar-87 02:40:06 EST
References: <8703170112.AA00614@ucbvax.Berkeley.EDU>
Distribution: world
Organization: Atari Corp., Sunnyvale CA
Lines: 29

in article <8703170112.AA00614@ucbvax.Berkeley.EDU>, JANKOWSJ@UNION.BITNET says:
>              Is there any-hacker in this universe that can assist me in
>          finding information about working with the G.E.M. functions
> 
>          vro_cpyfm(handle,copy_logic,xy_array,psource_mfdb,pdest_mfdb);
>          vrt_cpyfm(handle,writing_mode,xy_array,psource_mfdb,pdest,col);
> 
>              These two functions are used primarily to copy memory from
>          screen device to ram-memory of visa-versa.  However, I would
>          like to be able to copy from memory to memory or visa-versa.
>          Can this be accomplished with these functions or am I living in
>          a fantasy.

  Although I've never actually tried using these functions for memory to 
memory move, I don't see any reason why they shouldn't work.  Several caveats
are probably in order, however:

	1)  You'll probably want to use the monochrome raster copy.

        2)  Make _sure_ that your source and destination blocks the
            same size.

        3)  Make sure the pixel width of your raster is an even multiple
            of a word size (ie, 16).

        4)  You probably want to make sure that your source and destination
            rectangles don't overlap.

Good luck!