From:	"Ben Cohee" <benco AT gisco DOT net>
Subject:	Help from DJGPP AT&T/LINUX assembly guru's ;)
Message-ID:	<01bc871e$1d070820$55a333cf@gisco.net.gisco.net>
Newsgroups:	comp.os.msdos.djgpp
Date:	Wed, 02 Jul 1997 15:29:26 -0400
Lines:	34
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I need a function to be converted into assembly and needed help just
getting it converted to some intel style assembly but now that im using
DJGPP i need it done with AT&T assembly. I dont think it will make much
difference if its in inline assembly or an external .s file does it?? Well
anyway its kinda long but here it is.

void Scan_Out_Line(EDGESCAN *left,EDGESCAN *right)
{
fixed sourcex = left->sourcex;
fixed sourcey = left->sourcey;
int destx = left->destx,destxmax = right->destx;
fixed destwidth,sourcexstep,sourceystep;

if ((destxmax <= CLIP_MIN_X) || (destx >= CLIP_MAX_X))
    return;
if ((destxmax-destx) <= 0)
    return;

destwidth = itofix(destxmax-destx);
sourcexstep = fdiv(right->sourcex - sourcex,destwidth);
sourceystep = fdiv(right->sourcey - sourcey,destwidth);
sourcex += sourcexstep >> 1;
sourcey += sourceystep >> 1;

if (destxmax >= CLIP_MAX_X)
    destxmax = CLIP_MAX_X;
if (destx <= CLIP_MIN_X)
    {
    sourcex += fmul(sourcexstep,itofix(CLIP_MIN_X - destx));
    sourcey += fmul(sourceystep,itofix(CLIP_MIN_X - destx));
    destx = CLIP_MIN_X;
    }

for (; destx<destxmax; destx++)
    {
    buffer[ytable[desty] + destx] = image[ytable[sourcey] + sourcex];
    sourcex += sourcexstep;
    sourcey += sourceystep;
    }
}

Look familiar to anyone ;)

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