/*  gridsim2 (c) 2006 Kris Beevers  This file is part of gridsim2.  gridsim2 is free software; you can redistribute it and/or modify it  under the terms of the GNU General Public License as published by  the Free Software Foundation; either version 2 of the License, or  (at your option) any later version.  gridsim2 is distributed in the hope that it will be useful, but  WITHOUT ANY WARRANTY; without even the implied warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  General Public License for more details.  You should have received a copy of the GNU General Public License  along with gridsim2; if not, write to the Free Software Foundation,  Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA*/#include <inttypes.h>#include <assert.h>extern bool load_pgm(const char *file, uint8_t **grid, uint32_t *w, uint32_t *h);extern bool write_pgm(const char *file, const uint8_t *grid, uint32_t w, uint32_t h);inline uint8_t myabs(int i) { return i < 0 ? -i : i; }int main(int argc, char **argv){  assert(argc > 2);  uint32_t gw, gh, mw, mh;  uint8_t *grid, *map, *diff;  assert(load_pgm(argv[1], &grid, &gw, &gh));  assert(load_pgm(argv[2], &map, &mw, &mh));  assert(mw == gw && mh == gh);  diff = new uint8_t[gw*gh];  for(uint32_t i = 0; i < gw*gh; ++i)    //    diff[i] = (grid[i] != map[i]) ? 255 : 0;    diff[i] = myabs(int(grid[i])-int(map[i]));  write_pgm("diff.pgm", diff, gw, gh);  return 0;}