XExposeEvent - Expose event structure
The structure for Expose events contains:
typedef struct {
int type; Expose
unsigned long serial; # of last request processed by server
Bool send_event; true if this came from a SendEvent request
Display *display; Display the event was read from
Window window;
int x, y;
int width, height;
int count; if nonzero, at least this many more
} XExposeEvent;