BITBLT for 3030?

[Mark Grossman]

In article <8907071121.aa24621 at VMB.BRL.MIL>, moss at BRL.MIL ("Gary S. Moss", VLD/VMB) writes:

> however:  If the destination rectangle of the rectcopy() had an X coordinate
> which was a multiple of 16 (i.e., rectopy's 5th argument), than the copy
> was *very* fast, but anything else was blindingly slow.  I don't recall if
> the source rectangle's position was a factor or not (either it wasn't or
> my source rectangle happened to be aligned).  What I used to do was allow

Actually, this speedup can be achieved by ensuring that the DIFFERENCE
between the source and destination rectangle positions is a multiple
of 16.