// gcc test.c -lX11 -o test
#include <X11/Xlib.h>
#include <stdio.h>

#define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)

int main()
{
	Display *dpy;
	Window win;
	GC gc;
	int width = 1000;
	int height = 800;
	int black, white, x, y, i, time, len;
	struct timeval t1, t2;
	char string[300];
	char buf[256];
	dpy = XOpenDisplay(NULL);

	black = BlackPixel(dpy, DefaultScreen(dpy));
	white = WhitePixel(dpy, DefaultScreen(dpy));

	win = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, width, height, 0, white, black);
	XMapWindow(dpy, win);

	gc = XCreateGC(dpy, win, 0, NULL);

	for (i = 0; i < 95; i++) {
		string[i] = i + 32;
		string[i+95] = i + 32;
		string[i+95*2] = i + 32;
	}

	while (1) {
		gettimeofday(&t1, NULL);
		for (i = 0; i < 5; i++) {
			XSetForeground(dpy, gc, white);
			XFillRectangle(dpy, win, gc, 0, 0, width, height);
			XSetForeground(dpy, gc, black);
			XSetBackground(dpy, gc, white);
			len = sprintf(buf, "%i ms", time);
			XDrawImageString(dpy, win, gc, 5, 15, buf, len);
			for(y = 0; y < height/15; y ++)
				for(x = 0; x < width/30; x ++)
					XDrawImageString(dpy, win, gc, 5 + x*30 , 30 + y*15, "Test", 4);
			XFlush(dpy);
		}
		gettimeofday(&t2, NULL);
		time = TIMEDIFF(t2, t1);
//		printf("%i ms\n", time);
	}

	return 0;
}