Compress motion notify events

backends/x/event.go

@@ -101,7 +101,7 @@ func (backend *Backend) handleMotionNotify (
 	connection *xgbutil.XUtil,
 	event xevent.MotionNotifyEvent,
 ) {
-	motionEvent := *event.MotionNotifyEvent
+	motionEvent := backend.compressMotionNotify(*event.MotionNotifyEvent)
 	x, y := backend.cellAt (image.Point {
 		X: int(motionEvent.EventX),
 		Y: int(motionEvent.EventY),
@@ -132,3 +132,27 @@ func (backend *Backend) compressConfigureNotify (
 
 	return
 }
+
+func (backend *Backend) compressMotionNotify (
+	firstEvent xproto.MotionNotifyEvent,
+) (
+	lastEvent xproto.MotionNotifyEvent,
+) {
+	backend.connection.Sync()
+	xevent.Read(backend.connection, false)
+	lastEvent = firstEvent
+	
+	for index, untypedEvent := range xevent.Peek(backend.connection) {
+		if untypedEvent.Err != nil { continue }
+		
+		typedEvent, ok := untypedEvent.Event.(xproto.MotionNotifyEvent)
+		if !ok { continue }
+
+		lastEvent = typedEvent
+		defer func (index int) {
+			xevent.DequeueAt(backend.connection, index)
+		} (index)
+	}
+
+	return
+}