hsv_quantize.c

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#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <math.h>
#include <string.h>
#include <unistd.h>
#include <ppm.h>

#include "hsv_test.proto"

 main(int argc, char *argv[]) {
  
  FILE *ppm_file;
  PPM *im_hsv, *im_quant, *im_output;
  int *colmap;
  enum file_types ppm_type;
  enum ppm_error the_error;
  int numH, numS, numV, numGrey;

  switch(argc) {
  case 5:
    numH = atoi(argv[1]);
    numS = atoi(argv[2]);
    numV = atoi(argv[3]);
    numGrey = atoi(argv[4]);
    break;
  default:
    fprintf(stderr, "Usage: %s numH, numS, numV, numGrey\n\n", argv[0]);
    exit(1);
    break;
  }

  ppm_file = stdin;

  /* read the image we are going to quantize */
  switch(ppm_type = read_magic_no(ppm_file)) {
  case PGM_ASC: case PPM_ASC: case PGM_RAW: case PPM_RAW:
    if ((the_error = read_ppm(ppm_file, &im_hsv, ppm_type)) != PPM_OK) 
    {
      ppm_handle_error(the_error);
      exit(1);
    }
    break;
  default:
    fprintf(stderr, "Unrecognized file type.\n");
    exit(1);
    break;
  }

  /* quantize it */
  if ((the_error = hsv_quantize_ppm(im_hsv, &im_quant, &colmap, numH, numS, numV, numGrey)) != PPM_OK) {
    ppm_handle_error(the_error);
    exit(1);
  }

  /* convert the PGM and colour map to an "RGB" image */
  if ((the_error = colmap2rgb_ppm(im_quant, colmap, numH*numS*numV + numGrey, &im_output)) != PPM_OK) {
    ppm_handle_error(the_error);
    exit(1);
  }

  /* write this "RGB" image to stdout */
  if ((the_error = write_ppm(stdout, im_output, PPM_RAW)) != PPM_OK) {
    ppm_handle_error(the_error);
    exit(1);
  }

  exit(0);
}