From:	Vic <tudor AT cam DOT org>
Newsgroups:	comp.os.msdos.djgpp
Subject:	ASM code Q:
Date:	Tue, 02 Sep 1997 10:40:00 -0400
Organization:	Communications Accessibles Montreal, Quebec Canada
Lines:	23
Message-ID:	<340C2540.7B0@cam.org>
NNTP-Posting-Host:	dynamicppp-200.hip.cam.org
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hi. I'm just starting in ASM, and I'd like to know if this piece of code
is correct (I know it works, I just wanna make sure)
(it's a putpixel routine for an Allegro memory bitmap)

gcc2_compiled.:
___gnu_compiled_c:
.text
.globl _put_pixel //put_pixel(BITMAP*,x,y,color);must be memory bitmap!!
_put_pixel:

movl 4(%esp),%eax //move BITMAP* in %eax
movl 12(%esp),%ebx //move y in %ebx
movl 60(%eax,%ebx,4),%ecx //move the addres of BITMAP->line[y] in %ecx
movl 8(%esp),%eax //move x in %eax
movl 16(%esp),%ebx //move color in %ebx
movb %ebx,(%ecx,%eax,1) //put color in BITMAP->line[y][x]
ret

TIA,
-- 
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