Better support for expose events on X11.

ueforth/common/grf_test.fs

@@ -33,6 +33,7 @@ internals
       ." CHAR: " last-char . cr
     then
 )
+    MOTION event = EXPOSED event = or if
     0 to color 0 0 width height box
     g{
       vertical-flip
@@ -52,6 +53,7 @@ internals
       }g
     }g
     flip
+    then
   event FINISHED = until
   bye
 ;

ueforth/posix/grf.fs

@@ -82,8 +82,11 @@ StructureNotifyMask or constant EVENT-MASK
   IDLE to event
   xevent [ xany ] ->type sl@ to xevent-type
   Expose xevent-type = if
-    EXPOSED to event
+    [ xexposure ]
-    exit
+    xevent ->count @ 0= if
+      EXPOSED to event
+      exit
+    then
   then
   ConfigureNotify xevent-type = if
     RESIZED to event

ueforth/posix/x11.fs

@@ -142,6 +142,20 @@ struct XConfigureEvent
   bool field ->override_redirect
 previous definitions
 
+vocabulary xexposure  also xexposure definitions
+struct XExposeEvent
+   i32 field ->type
+  long field ->serial
+  bool field ->send_event
+   ptr field ->display
+   win field ->window
+   i32 field ->x
+   i32 field ->y
+   i32 field ->width
+   i32 field ->height
+   i32 field ->count
+previous definitions
+
 0 constant NoEventMask
 1 : xmask   dup constant 2* ;
 xmask KeyPressMask