From 81dcd2f844d6a5fe37d7f1f84a052031cea39bd9 Mon Sep 17 00:00:00 2001
From: Dominic Clark <mrdomclark@gmail.com>
Date: Wed, 7 Oct 2020 13:37:08 +0100
Subject: [PATCH] Don't reload sample from disk when reversing (#5701)

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

diff --git a/src/core/SampleBuffer.cpp b/src/core/SampleBuffer.cpp
index 368600752f0..ffe631ca44b 100644
--- a/src/core/SampleBuffer.cpp
+++ b/src/core/SampleBuffer.cpp
@@ -24,6 +24,8 @@
 
 #include "SampleBuffer.h"
 
+#include <algorithm>
+
 #include <QBuffer>
 #include <QFile>
 #include <QFileInfo>
@@ -1411,8 +1413,13 @@ void SampleBuffer::setAmplification( float _a )
 
 void SampleBuffer::setReversed( bool _on )
 {
+	Engine::mixer()->requestChangeInModel();
+	m_varLock.lockForWrite();
+	if (m_reversed != _on) { std::reverse(m_data, m_data + m_frames); }
 	m_reversed = _on;
-	update( true );
+	m_varLock.unlock();
+	Engine::mixer()->doneChangeInModel();
+	emit sampleUpdated();
 }