To: djgpp AT sun DOT soe DOT clarkson DOT edu
From: hegt AT iaci DOT kun DOT nl
Subject: fast memory to VGA update
Date: Thu, 03 Jun 93 08:20:58 CDT
Sender: hegt AT tyche DOT soe


Hello all,

I am currently porting an application to the PC using DJGPP. Everything
works remarably smooth, but I have this little qusetion involving the
graphics part of my port.

The application I am working on is some kind of windowing system, which
does maintain a memory mapped 2 bits deep bitmap of the image that is to
be displayed on the screen. I have already prototyped a solution where I
have replaced my own graphical primitives by LIBGRX primitives, and that
works quite alright. Because it is very likely that I am going to have
to port more of this type of applications, which are using the same
memory bitmap scheme but different primitives I would rather like a
blazingly fast way to update the PC screen from this 640x400x2 bitmap.

Since I am only supporting the standard VGA mode, I suppose the can be a
faster way than using the standard libgrx calls, which are portable
between several drivers and modes.

Does anyone have any hints on where to look or how to go on?

Thanks,
Rob Hegt