From 6ce364f2d23b2fdf00abe2ed17f66cd105c98234 Mon Sep 17 00:00:00 2001
From: lllucius <lllucius@47890b92-0858-11df-a26f-8b716316a5bc>
Date: Sat, 4 Oct 2014 22:50:51 +0000
Subject: [PATCH] Get rid of flicker when drawing the peak/rms meter.

---
 src/widgets/Meter.cpp | 5 +++--
 src/widgets/Meter.h   | 3 +--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/widgets/Meter.cpp b/src/widgets/Meter.cpp
index 8188452ec..b839b33ed 100644
--- a/src/widgets/Meter.cpp
+++ b/src/widgets/Meter.cpp
@@ -43,6 +43,7 @@
 
 #include <wx/defs.h>
 #include <wx/dialog.h>
+#include <wx/dcbuffer.h>
 #include <wx/dcmemory.h>
 #include <wx/image.h>
 #include <wx/intl.h>
@@ -1129,9 +1130,10 @@ void Meter::RepaintBarsNow()
    if (mLayoutValid)
    {
       wxClientDC dc(this);
+      wxBufferedDC bufDC(&dc, *mBitmap);
       for (int i = 0; i < mNumBars; i++)
       {
-         DrawMeterBar(dc, &mBar[i]);
+         DrawMeterBar(bufDC, &mBar[i]);
       }
    }
 }
@@ -1213,7 +1215,6 @@ void Meter::DrawMeterBar(wxDC &dc, MeterBar *meterBar)
       if (meterBar->vert)
       {
          // Calculate the peak and rms rectangles
-         // (+1 and -1 to not overlay the bevel)
          ht = (int)(meterBar->peak * h + 0.5);
          r = wxRect(x, y + h - ht, w, ht);
          ht = (int)(meterBar->rms * h + 0.5);
diff --git a/src/widgets/Meter.h b/src/widgets/Meter.h
index 33382c60c..28789a7b0 100644
--- a/src/widgets/Meter.h
+++ b/src/widgets/Meter.h
@@ -25,7 +25,7 @@
 #include "Ruler.h"
 
 // Event used to notify all meters of preference changes
-DECLARE_EVENT_TYPE(EVT_METER_PREFERENCES_CHANGED, -1);
+DECLARE_EXPORTED_EVENT_TYPE(AUDACITY_DLL_API, EVT_METER_PREFERENCES_CHANGED, -1);
 
 // Increase this when we add support for multichannel meters
 // (most of the code is already there)
@@ -43,7 +43,6 @@ struct MeterBar {
    bool   isclipping; //ANSWER-ME: What's the diff between these bools?! "clipping" vs "isclipping" is not clear.
    int    tailPeakCount;
    float  peakPeakHold;
-   wxBitmap bitmap;
 };
 
 class MeterUpdateMsg