From cfdbcf9bc3cf4b564e3be91ca765312a27791ee5 Mon Sep 17 00:00:00 2001
From: "Charles J. Cliffe" <cj@cubicproductions.com>
Date: Mon, 14 Mar 2016 19:27:34 -0400
Subject: [PATCH] Patch major font rendering performance hit while zoomed

---
 src/panel/SpectrumPanel.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/panel/SpectrumPanel.cpp b/src/panel/SpectrumPanel.cpp
index 699887f..5fcf2f6 100644
--- a/src/panel/SpectrumPanel.cpp
+++ b/src/panel/SpectrumPanel.cpp
@@ -222,8 +222,15 @@ void SpectrumPanel::drawPanelContents() {
         fontEnumSize = GLFont::GLFONT_SIZE16;
         hPos = 1.0 - (18.0 / viewHeight);
     }
-
+    
     for (double m = -1.0 + mhzStart, mMax = 1.0 + ((mhzStart>0)?mhzStart:-mhzStart); m <= mMax; m += mhzStep) {
+        if (m < -1.0) {
+            currentMhz += mhzVisualStep;
+            continue;
+        }
+        if (m > 1.0) {
+            break;
+        }
         label << std::fixed << currentMhz;
         
         double fractpart, intpart;