Watch movie without screen getting locked

movietime.c

#include<X11/Xlib.h>
#include<X11/Xutil.h>
#include<X11/keysym.h>
#include<unistd.h>

#define DURATION 100

int main()
{
    Display *display = NULL;

    display = XOpenDisplay(NULL);
    while(1)
    {
        XWarpPointer(display, None, None, 0, 0, 0, 0, 100, 100);
        XFlush(display);
        sleep(DURATION);
        XWarpPointer(display, None, None, 0, 0, 0, 0, -100, -100);            
        XFlush(display);
        sleep(DURATION);
    }
    return 0;
}