/*

Example function to write an RGB .ppm image file

Author: Stan Sclaroff
Date: November 19, 2003

Arguments: 

unsigned byte *buff -- a pointer to an RGB image, one byte per R,G,B per pixel.

int width, int height -- image dimensions (in pixels)

char *fpath -- the file name path for the image output file 

Returns: 1 if successful, 0 if unsuccessful

*/

#include <stdio.h>

int write_rgb_ppm(unsigned char *buff, int width, int height, char *fpath)
{

  FILE *f;
  
  /* open the file for writing (overwrite any previous version) */
  if((f = fopen(fpath,"wb")) == 0)
    {
      fprintf(stderr,"Cannot open image output file (name = %s)\n",fpath);
      return 0;
    }

  /* the ASCII header of the PPM file */

  fprintf(f,"P6\n");  /* magic number for PPM files */
  fprintf(f,"%i %i\n",width,height); /* dimensions */
  fprintf(f,"255\r");  /* max intensity value */

  /* write the pixels, 3 bytes/pixel */

  fwrite(buff,3,width*height,f);

  fclose(f);

  return 1;
}