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/* Copyright (c) 1992 AT&T - All rights reserved. */
#include <libc.h>
#include <libg.h>
#include "libgint.h"
#define CHUNK 4096
void
wrbitmapfile(int fd, Bitmap *b)
{
char hdr[5*12+1];
unsigned char *data;
long dy, px;
unsigned long l, t, n;
long miny, maxy;
sprint(hdr, "%11d %11d %11d %11d %11d ",
b->ldepth, b->r.min.x, b->r.min.y, b->r.max.x, b->r.max.y);
if(write(fd, hdr, 5*12) != 5*12)
berror("wrbitmapfile write");
px = 1<<(3-b->ldepth); /* pixels per byte */
/* set l to number of bytes of data per scan line */
if(b->r.min.x >= 0)
l = (b->r.max.x+px-1)/px - b->r.min.x/px;
else{ /* make positive before divide */
t = (-b->r.min.x)+px-1;
t = (t/px)*px;
l = (t+b->r.max.x+px-1)/px;
}
miny = b->r.min.y;
maxy = b->r.max.y;
data = (unsigned char *)malloc(CHUNK);
if(data == 0)
berror("wrbitmapfile malloc");
while(maxy > miny){
dy = maxy - miny;
if(dy*l > CHUNK)
dy = CHUNK/l;
rdbitmap(b, miny, miny+dy, data);
n = dy*l;
if(write(fd, data, n) != n){
free(data);
berror("wrbitmapfile write");
}
miny += dy;
}
free(data);
}
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