w3d/tools/pnmdiff.c

   1
   2 /**
   3  *   Ugly Hack.
   4  */
   5
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <fcntl.h>
   9 #include <unistd.h>
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <stdint.h>
  13 #include <string.h>
  14 #include "mem.h"
  15 #include "pnm.h"
  16 #include "bitcoder.h"
  17
  18
  19 static
  20 void usage (const char *program_name)
  21 {
  22    printf ("\n"
  23      " usage: %s <file1.ppm> <file2.ppm>\n"
  24      "\n", program_name);
  25    exit (-1);
  26 }
  27
  28
  29 #define ABS(x) ((x) < 0 ? (-x) : (x))
  30
  31
  32 int main (int argc, char **argv)
  33 {
  34    int n_chan1, n_chan;
  35    uint8_t *rgb1, *rgb2, *diff;
  36    uint32_t width, height, width1, height1;
  37    uint32_t i;
  38
  39    if (argc != 3)
  40       usage (argv[0]);
  41
  42    if ((n_chan1 = read_pnm_header (argv[1], &width1, &height1)) < 0) {
  43       printf ("error opening '%s' !!\n", argv[1]);
  44       exit (-1);
  45    }
  46
  47    if ((n_chan = read_pnm_header (argv[2], &width, &height)) < 0) {
  48       printf ("error opening '%s' !!\n", argv[2]);
  49       exit (-1);
  50    }
  51
  52    if (!(width1 == width && height1 == height && n_chan1 == n_chan)) {
  53       printf ("image sizes differ !!\n");
  54       exit (-1);
  55    }
  56
  57    rgb1  = MALLOC (width * height * n_chan);
  58    rgb2  = MALLOC (width * height * n_chan);
  59    diff  = MALLOC (width * height * n_chan);
  60
  61    if (read_pnm (argv[1], rgb1) < 0)
  62    {
  63       printf ("error opening '%s' !\n", argv[1]);
  64       exit(-1);
  65    }
  66
  67    if (read_pnm (argv[2], rgb2) < 0)
  68    {
  69       printf ("error opening '%s' !\n", argv[2]);
  70       exit(-1);
  71    }
  72
  73    for (i=0; i<width*height*n_chan; i++) {
  74       diff[i] = (rgb1[i] == rgb2[i]) ? 0 : 255;
  75 //      diff[i] = ((int) rgb1[i] - rgb2[i])*64 + 128;
  76       if (diff[i] != 0/*128*/) {
  77          printf("%i/%i: %u <-> %u  -- diff == %i\n",
  78                 i, width*height*n_chan-1, rgb1[i], rgb2[i], diff[i] - 128);
  79          bit_print(rgb1[i]);
  80          bit_print(rgb2[i]);
  81       }
  82    }
  83
  84    write_pnm (n_chan == 1 ? "diff.pgm" : "diff.ppm", diff, width, height);
  85
  86    FREE (rgb1);
  87    FREE (rgb2);
  88    FREE (diff);
  89
  90    return 0;
  91 }
  92
  93