My first xscreensaver module

Linux Screensaver.c

#include "screenhack.h"

static const char* nevinScreensaver_defaults[] = {
	".background: black",
	".foreground: white",
};

static XrmOptionDescRec nevinScreensaver_options [] = {
	{"-delay",		".delay",	XrmoptionSepArg, 0 }
};

struct state {
	Display* dpy;
	Window window;
	int delay;
	int maxCount;
	int width, height;
	GC gc;
	Colormap cmap;
	unsigned long fg, bg, pixels [512];
};

static void* nevinScreensaver_init(Display *dpy, Window window) {
	struct state *st = (struct state*) calloc (1, sizeof(*st));
	XGCValues gcv;
	XWindowAttributes xgwa;
	st->dpy = dpy;
	st->window = window;
	st->delay = 14000;
	st->maxCount = 0;

	XGetWindowAttributes(st->dpy, st->window, &xgwa);
	st->width = xgwa.width;
	st->width = xgwa.height;
	st->cmap = xgwa.colormap;

	gcv.foreground = st->fg = get_pixel_resource(st->dpy, st->cmap, "foreground", "Foreground");
	gcv.background = st->bg = get_pixel_resource(st->dpy, st->cmap, "background", "Background");
	st->gc = XCreateGC(st->dpy, st->window, GCForeground, &gcv);
	return st;
}

static unsigned long nevinScreensaver_draw (Display *dpy, Window window, void *closure) {
	struct state *st = (struct state*) closure;

	if (st->maxCount > 100000) {
		XClearWindow(dpy, window);
		st->maxCount = 0;
	}
	if (random() % 2 == 1){ XFillRectangle(dpy, window, st->gc, random() % st->width, random() % st->height, random() % st->width / 10, random() % st->height / 10); }
	else { XDrawRectangle(dpy, window, st->gc, random() % st->width, random() % st->height, random() % st->width / 10, random() % st->height / 10); }
	st->maxCount++;
	/* XDrawLine(dpy, window, st->gc, 20, 20, 40, 40); */
	return st->delay;
}

static void nevinScreensaver_reshape(Display *dpy, Window window, void *closure, unsigned int w, unsigned int h) {
	struct state *st = (struct state *) closure;
	st->width = w;
	st->height = h;
}

static Bool nevinScreensaver_event(Display *dpy, Window window, void *closure, XEvent *event) {
	return False;
}

static void nevinScreensaver_free(Display *dpy, Window window, void *closure) {
	struct state *st = (struct state *) closure;
	XFreeGC(st->dpy, st->gc);
	free(st);
}

XSCREENSAVER_MODULE("nevinScreensaver", nevinScreensaver)