Add a method to track value changes in AutomatableModel - this can be used by DSP code instead of signals/slots to improve performance

include/AutomatableModel.h

@@ -25,7 +25,7 @@
 #ifndef AUTOMATABLE_MODEL_H
 #define AUTOMATABLE_MODEL_H
 
-#include <math.h>
+#include "lmms_math.h"
 
 #include "JournallingObject.h"
 #include "Model.h"
@@ -70,7 +70,8 @@ public:
 	enum ScaleType
 	{
 		Linear,
-		Logarithmic
+		Logarithmic,
+		Decibel
 	};
 
 	enum DataType
@@ -239,6 +240,15 @@ public:
 		return m_hasLinkedModels;
 	}
 
+	bool isValueChanged()
+	{
+		if( m_valueChanged )
+		{
+			m_valueChanged = false;
+			return true;
+		}
+	}
+
 	float globalAutomationValueAt( const MidiTime& time );
 
 public slots:
@@ -288,6 +298,8 @@ private:
 	float m_step;
 	float m_range;
 	float m_centerValue;
+	
+	bool m_valueChanged;
 
 	// most objects will need this temporarily (until sampleExact is
 	// standard)

src/core/AutomatableModel.cpp

@@ -47,6 +47,7 @@ AutomatableModel::AutomatableModel( DataType type,
 	m_step( step ),
 	m_range( max - min ),
 	m_centerValue( m_minValue ),
+	m_valueChanged( false ),
 	m_setValueDepth( 0 ),
 	m_hasLinkedModels( false ),
 	m_controllerConnection( NULL )
@@ -234,6 +235,7 @@ void AutomatableModel::setValue( const float value )
 				(*it)->setJournalling( journalling );
 			}
 		}
+		m_valueChanged = true;
 		emit dataChanged();
 	}
 	else
@@ -327,6 +329,7 @@ void AutomatableModel::setAutomatedValue( const float value )
 				(*it)->setAutomatedValue( value );
 			}
 		}
+		m_valueChanged = true;
 		emit dataChanged();
 	}
 	--m_setValueDepth;
@@ -471,6 +474,7 @@ void AutomatableModel::setControllerConnection( ControllerConnection* c )
 	{
 		QObject::connect( m_controllerConnection, SIGNAL( valueChanged() ), this, SIGNAL( dataChanged() ) );
 		QObject::connect( m_controllerConnection, SIGNAL( destroyed() ), this, SLOT( unlinkControllerConnection() ) );
+		m_valueChanged = true;
 		emit dataChanged();
 	}
 }