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       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;

       When you receive this event, the structure members are set as follows.

       The  type  member is set to the event type constant name that uniquely identifies it.  For
       example, when the X server reports a GraphicsExpose event  to  a  client  application,  it
       sends  an  XGraphicsExposeEvent structure with the type member set to GraphicsExpose.  The
       display member is set to a pointer to the display the event was read on.   The  send_event
       member  is  set  to  True if the event came from a SendEvent protocol request.  The serial
       member is set from the serial number reported in the protocol but expanded from the 16-bit
       least-significant  bits  to  a  full 32-bit value.  The window member is set to the window
       that is most useful to toolkit dispatchers.

       The window member is set to the exposed (damaged) window.  The x and y members are set  to
       the  coordinates relative to the window's origin and indicate the upper-left corner of the
       rectangle.  The width and height members are set to the size (extent)  of  the  rectangle.
       The  count  member  is set to the number of Expose events that are to follow.  If count is
       zero, no more Expose events follow for this window.  However,  if  count  is  nonzero,  at
       least  that  number  of  Expose events (and possibly more) follow for this window.  Simple
       applications that do not want to optimize redisplay by distinguishing between subareas  of
       its  window  can  just  ignore  all  Expose  events  with  nonzero counts and perform full
       redisplays on events with zero counts.


       XAnyEvent(3),      XButtonEvent(3),       XCreateWindowEvent(3),       XCirculateEvent(3),
       XCirculateRequestEvent(3),              XColormapEvent(3),             XConfigureEvent(3),
       XConfigureRequestEvent(3),  XCrossingEvent(3),   XDestroyWindowEvent(3),   XErrorEvent(3),
       XFocusChangeEvent(3),    XGraphicsExposeEvent(3),    XGravityEvent(3),    XKeymapEvent(3),
       XMapEvent(3),       XMapRequestEvent(3),       XPropertyEvent(3),       XReparentEvent(3),
       XResizeRequestEvent(3),            XSelectionClearEvent(3),            XSelectionEvent(3),
       XSelectionRequestEvent(3), XUnmapEvent(3), XVisibilityEvent(3)
       Xlib - C Language X Interface