🚀 go-pugleaf

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!