From:	"Cody" <cody1 AT ktsnet DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	bitblt and graphics
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Date:	Mon, 29 Jan 2001 21:36:38 -0600
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To:	djgpp AT delorie DOT com
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Although this doesn't have much to do with djgpp, it has something to do
with programming general, and I think that many people in this newsgroup
would know the solution to my problems.  I program mostly in dos, and only
for less than a year in it.  I was wondering what does the term bitblt mean?
I have seen it in windows and dos newsgroups.  How exactly does it work, the
exact specifications of it, such as how does it work, how can I implement it
the fastest (speed wise for my programs) in a 16-bit application?  I am
asking this because I need to know it for my (small) graphics library that
I'm making. I program mostly in turbo pascal, but if somebody here can
explain everything I need in c++ then I understand it also.  I'm tired of
using the slow and cumbersome borland's graphical interface (egavga.bgi).
However, I found some procedures such as xorput, orput, copyput, etc. in the
.bgi that I believe are somewhat faster in doing animation than simply
drawing a picture, putting black pixels all over the original spot, drawing
it somewhere else, erasing that with black pixels.... you get the picture.
If anyone in here has experience with bitblt, orespecially if you have
experience with dos graphics, then please email me or reply to this
newsgroup with help.  Thanks for your time, and I look forward to all
constructive replies.  Also, if anyone knows the fastest routines/algorithms
for basic graphical functions in dos, then I'd be more than happy to discuss
then with you.  If anyone is on msn messenger and knows something about
graphics in dos, then I wish I could ask you some questions.  Also, if
anyone knows the FASTEST way to put a pixel in a 16-bit app, I would like to
know it also.  I also need to know how to change to the following video
modes (keep in mind it's 16-bit... if that has anything to do with it):
320x200x256,320x240x256,640x480x256,800x600x256, although the last one's not
as important.  I also need to know how to change make to text mode (80x25).
Any help on these topics would be much appreciated.
p.s.  I have the allegro gaming library, and djgpp, and they are both
excellent resources.  However, I'm trying to create my own from scratch
(nothing like allegro of course) so that I have a better understanding of
how it all works.  Thanks for your time all, and I hope that noone's pissed
at me for putting this in djgpp newsgroup.

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