From 71383b4cb698793cf3e61c6cf2555bf331bdaa57 Mon Sep 17 00:00:00 2001
From: "Charles J. Cliffe" <cj@cubicproductions.com>
Date: Tue, 20 Oct 2015 18:32:49 -0400
Subject: [PATCH] Avoid extra locking if queue is empty

---
 src/visual/WaterfallCanvas.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/visual/WaterfallCanvas.cpp b/src/visual/WaterfallCanvas.cpp
index 68457d8..8ce6130 100644
--- a/src/visual/WaterfallCanvas.cpp
+++ b/src/visual/WaterfallCanvas.cpp
@@ -109,7 +109,9 @@ void WaterfallCanvas::processInputQueue() {
 void WaterfallCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     wxPaintDC dc(this);
 
-    processInputQueue();
+    if (visualDataQueue.size() > 0) {
+        processInputQueue();
+    }
     
     const wxSize ClientSize = GetClientSize();
     long double currentZoom = zoom;