let SpeedSegment scale itself.

also fixes the bug where the segments outside of the scaling region are scaled too.

src/TimingData.cpp

@@ -1332,12 +1332,7 @@ void TimingData::ScaleRegion( float fScale, int iStartIndex, int iEndIndex, bool
 		m_LabelSegments[i].Scale( iStartIndex, length, newLength );
 	
 	for ( unsigned i = 0; i < m_SpeedSegments.size(); i++ )
-	{
-		SpeedSegment &s = m_SpeedSegments[i];
-		s.Scale( iStartIndex, length, newLength );
-		if (s.GetUnit() == 0) // beats
-			s.SetLength(s.GetLength() * fScale);
-	}
+		m_SpeedSegments[i].Scale( iStartIndex, length, newLength );
 	
 	for( unsigned i = 0; i < m_FakeSegments.size(); i++ )
 		m_FakeSegments[i].Scale( iStartIndex, length, newLength );

src/TimingSegments.cpp

@@ -250,6 +250,20 @@ void SpeedSegment::SetUnit(const int i)
 	this->unit = static_cast<unsigned short>(i);
 }
 
+void SpeedSegment::Scale( int start, int length, int newLength )
+{
+	if( GetUnit() == 0 )
+	{
+		// XXX: this function is duplicated, there should be a better way
+		float startBeat    = GetBeat();
+		float endBeat      = startBeat + GetLength();
+		float newStartBeat = ScalePosition( NoteRowToBeat(start), NoteRowToBeat(length), NoteRowToBeat(newLength), startBeat );
+		float newEndBeat   = ScalePosition( NoteRowToBeat(start), NoteRowToBeat(length), NoteRowToBeat(newLength), endBeat );
+		SetLength( newEndBeat - newStartBeat );
+	}
+	TimingSegment<SpeedSegment>::Scale( start, length, newLength );
+}
+
 bool SpeedSegment::operator<( const SpeedSegment &other ) const
 {
 	LTCOMPARE(GetRow());

src/TimingSegments.h

@@ -681,6 +681,8 @@ struct SpeedSegment : public TimingSegment<SpeedSegment>
 	 * @param i the unit. */
 	void SetUnit(const int i);
 	
+	void Scale( int start, int length, int newLength );
+
 	/**
 	 * @brief Compares two SpeedSegments to see if one is less than the other.
 	 * @param other the other SpeedSegment to compare to.