# Category : C Source Code

Archive : EGA-C.ZIP

Filename : GPAMTGD.C

unsigned char far *image;

unsigned int width,height,length;

{

extern unsigned int gdvw_x1,gdvw_x2,gdvw_x3;

extern unsigned int gdvw_y1,gdvw_y2,gdvw_y3;

extern unsigned int Dither4[4][4];

unsigned char xscale[640];

unsigned char yscale[350];

unsigned char row[640];

int w,h,x,y,c;

int xi,xc,xs,yi,yc,ys;

gpcolor(0);

gpmove(gdvw_x1,gdvw_y1);

gpbox(gdvw_x2,gdvw_y2);

/* The dimension to our idea image is width x height. Determine the largest

possible real image dimension for the current viewport. */

if (((long)gdvw_y3 * (long)width * 4L) / (height * 3) <= gdvw_x3)

{

w = ((long)gdvw_y3 * (long)width * 4L) / (height * 3);

h = gdvw_y3;

}

else

{

w = gdvw_x3;

h = ((long)height * (long)gdvw_x3 * 3L) / (width * 4);

};

/* Generate X and Y scale tables */

gpslope(xscale,width,w);

gpslope(yscale,height,h);

y = 0;

for (ys = 0; ys < height; ys++)

{

if ((yc = yscale[ys]) != 0)

{

while (yc--)

{

x = 0;

xi = ys * length;

for (xs = 0; xs < width; xs++, xi++)

{

if ((xc = xscale[xs]) != 0)

{

while (xc--)

{

c = image[xi];

row[x++] = c / 16 + ( c % 16 > Dither4[y % 4][x % 4]) + 8;

/* row[x++] = c / 13 + 8; */

}

}

}

gpmove(gdvw_x1,gdvw_y1+y);

gpwtrow(row,w);

y++;

}

}

}

}

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