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wrbitmapfile.c

/* 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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