From: ludvig <ludvig AT club-internet DOT fr>
Newsgroups: comp.os.msdos.djgpp
Subject: How to use movedata with a pointer ?
Date: Mon, 22 Sep 1997 18:06:16 +0200
Organization: Grolier Interactive Europe
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Message-ID: <34269778.15B8@club-internet.fr>
Reply-To: ludvig AT club-internet DOT fr
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To: djgpp AT delorie DOT com
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Hi everyone!

I'm trying to speed up some graphic code of mine so a friend can be
amazed about what you can do with DJGPP(he=486DX66, me P133). So, the
thing is that I have a screen_buffer that I want to put on screen, no
problem, I have already written a C-optimized(more or less) put_bmp
function, but I want to put a specific bitmap always on a specific place
on sceen and I want to use movedata until I start programming
asm...(movedata might speed up my put_bmp function too but it's not that
important, yet:) ).

So, I have a

screen_buffer=malloc(416*416*2); in my init_graphics() function

and I would be able to flush a selected part on 0xA0000+offset.

like

for(n=0;n<208;n++)
 _farpokew(_dos_ds,0xA0000+offset+n,screen_buffer[ibmp+n]); 


where offset and ibmp is *eh* offsets.

But I want to use movedata.

How do I do? I have tried in vain to set the _my_ds selector to
screen_buffer[ibmp] etc and well, it doesn't work. I think the solution
might be really simple but as with problems, when you don't know the
answers, they are always hard to solve.

Ludvig

ps. please send me a copy <ludvig AT club-internet DOT fr>