code/libpng/png.c

#define _XOPEN_SOURCE
#include "img.h"
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv)
{

    if (argc != 4) {
	fprintf(stderr, "\nusage: %s count width height", argv[0]);
	exit(EXIT_FAILURE);
    }

    int width, height, c;

    c = atoi(argv[1]);
    width = atoi(argv[2]);
    height = atoi(argv[3]);

    pix_row rows[width];
    pix p;
    char filename[60];
    int i, j, x, y, count;
    image img;
    p.r = 200;
    p.g = 200;
    p.b = 200;

    srand48(1000);

    for (count = 0; count < (c); count++) {

	for (i = 0; i < width; i++) {
	    rows[i].p = malloc(height * sizeof(pix));
	    for (j = 0; j < height; j++) {
		p.r = (int) (drand48() * 255);
		p.g = (int) (drand48() * 255);
		p.b = (int) (drand48() * 255);
		rows[i].p[j] = p;
	    }
	}
	sprintf(filename, "images/image%05d.png", count);
	img = initialize_png("image010", filename, width, height);
	write_image(&img, rows);
	finish_image(&img);

	for (i = 0; i < width; i++) {

	    free(rows[i].p);
	}
    }

    return (0);

}