// SPDX-License-Identifier: GPL-2.1-or-later
/*
 * Copyright (C) 2009-2013 Cyril Hrubis <metan@ucw.cz>
 */

 /*

   Gaussian additive noise example.

  */

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#include <gfxprim.h>

static void help(const char *app)
{
        printf("usage: %s -s float -m float input.img output.img\n\n", app);
        printf("     -s [0,1] sigma in pixels\n");
        printf("     -m [0,1] mu in pixels\n");
}

int main(int argc, char *argv[])
{
        gp_pixmap *img;
        float sigma = 0.1, mu = 0.1;
        int opt;

        while ((opt = getopt(argc, argv, "s:m:")) != -1) {
                switch (opt) {
                case 's':
                        sigma = atof(optarg);
                break;
                case 'm':
                        mu = atof(optarg);
                break;
                default:
                        help(argv[0]);
                        return 1;
                }
        }

        if (argc - optind != 2) {
                help(argv[0]);
                return 1;
        }

        img = gp_load_image(argv[optind], NULL);

        if (img == NULL) {
                fprintf(stderr, "Failed to load image '%s': %s\n",
                        argv[optind], strerror(errno));
                return 1;
        }

        gp_pixmap *res = gp_filter_gaussian_noise_add_alloc(img, sigma, mu, NULL);

        if (gp_save_image(res, argv[optind + 1], NULL)) {
                fprintf(stderr, "Failed to save image '%s': %s",
                        argv[optind + 1], strerror(errno));
                return 1;
        }

        return 0;
}