Remove indirection storing number scale in Ruler

src/NumberScale.h

@@ -24,6 +24,7 @@ enum NumberScaleType {
    nstPeriod,
 
    nstNumScaleTypes,
+   nstNone,
 };
 
 
@@ -31,7 +32,7 @@ class NumberScale
 {
 public:
    NumberScale()
-      : mType(nstLinear), mValue0(0), mValue1(1)
+      : mType(nstNone), mValue0(0), mValue1(1)
    {}
 
    NumberScale(NumberScaleType type, float value0, float value1)
@@ -39,6 +40,7 @@ public:
    {
       switch (mType) {
       case nstLinear:
+      case nstNone:
       {
          mValue0 = value0;
          mValue1 = value1;
@@ -156,6 +158,7 @@ public:
       default:
          wxASSERT(false);
       case nstLinear:
+      case nstNone:
          return mValue0 + pp * (mValue1 - mValue0);
       case nstLogarithmic:
          return exp(mValue0 + pp * (mValue1 - mValue0));
@@ -186,6 +189,7 @@ public:
          default:
             wxASSERT(false);
          case nstLinear:
+         case nstNone:
          case nstLogarithmic:
             return mValue;
          case nstMel:
@@ -203,6 +207,7 @@ public:
       {
          switch (mType) {
          case nstLinear:
+         case nstNone:
          case nstMel:
          case nstBark:
          case nstErb:
@@ -230,6 +235,7 @@ public:
       default:
          wxASSERT(false);
       case nstLinear:
+      case nstNone:
       case nstMel:
       case nstBark:
       case nstErb:
@@ -253,6 +259,7 @@ public:
       default:
          wxASSERT(false);
       case nstLinear:
+      case nstNone:
          return ((val - mValue0) / (mValue1 - mValue0));
       case nstLogarithmic:
          return ((log(val) - mValue0) / (mValue1 - mValue0));

src/tracks/playabletrack/wavetrack/ui/SpectrumVRulerControls.cpp

@@ -193,7 +193,7 @@ void SpectrumVRulerControls::DoUpdateVRuler(
          NumberScale scale(
             wt->GetSpectrogramSettings().GetScale( minFreq, maxFreq )
                .Reversal() );
-         vruler->SetNumberScale(&scale);
+         vruler->SetNumberScale(scale);
       }
          break;
    }

src/tracks/playabletrack/wavetrack/ui/WaveformVZoomHandle.cpp

@@ -120,7 +120,6 @@ void WaveformVZoomHandle::DoZoom(
    const float halfrate = rate / 2;
    float maxFreq = 8000.0;
    const SpectrogramSettings &specSettings = pTrack->GetSpectrogramSettings();
-   NumberScale scale;
 
    bool bDragZoom = WaveTrackVZoomHandle::IsDragZooming(zoomStart, zoomEnd);
    // Add 100 if spectral to separate the kinds of zoom.

src/widgets/Ruler.cpp

@@ -78,7 +78,6 @@ using std::max;
 //
 
 Ruler::Ruler()
-   : mpNumberScale{}
 {
    mMin = mHiddenMin = 0.0;
    mMax = mHiddenMax = 100.0;
@@ -290,19 +289,11 @@ void Ruler::SetFonts(const wxFont &minorFont, const wxFont &majorFont, const wxF
    Invalidate();
 }
 
-void Ruler::SetNumberScale(const NumberScale *pScale)
+void Ruler::SetNumberScale(const NumberScale &scale)
 {
-   if (!pScale) {
-      if (mpNumberScale) {
-         mpNumberScale.reset();
-         Invalidate();
-      }
-   }
-   else {
-      if (!mpNumberScale || *mpNumberScale != *pScale) {
-         mpNumberScale = std::make_unique<NumberScale>(*pScale);
-         Invalidate();
-      }
+   if ( mNumberScale != scale ) {
+      mNumberScale = scale;
+      Invalidate();
    }
 }
 
@@ -886,7 +877,7 @@ struct Ruler::Updater {
    const double mMin = mRuler.mMin;
    const double mMax = mRuler.mMax;
    const int mLeftOffset = mRuler.mLeftOffset;
-   const NumberScale *mpNumberScale = mRuler.mpNumberScale.get();
+   const NumberScale mNumberScale = mRuler.mNumberScale;
 
    struct TickOutputs;
    
@@ -1189,10 +1180,9 @@ void Ruler::Updater::Update(
    else {
       // log case
 
-      NumberScale numberScale(mpNumberScale
-         ? *mpNumberScale
-         : NumberScale(nstLogarithmic, mMin, mMax)
-      );
+      auto numberScale = ( mNumberScale == NumberScale{} )
+         ? NumberScale( nstLogarithmic, mMin, mMax )
+         : mNumberScale;
 
       double UPP = (mHiddenMax-mHiddenMin)/mLength;  // Units per pixel
       TickSizes tickSizes{ UPP, mOrientation, mFormat, true };

src/widgets/Ruler.h

@@ -12,6 +12,7 @@
 #define __AUDACITY_RULER__
 
 #include "wxPanelWrapper.h" // to inherit
+#include "../NumberScale.h" // member variable
 
 #include <wx/colour.h> // member variable
 #include <wx/pen.h> // member variable
@@ -20,7 +21,6 @@ class wxArrayString;
 class wxDC;
 class wxFont;
 
-class NumberScale;
 class Envelope;
 class ZoomInfo;
 
@@ -105,8 +105,7 @@ class AUDACITY_DLL_API Ruler {
    Fonts GetFonts() const
    { return mFonts; }
 
-   // Copies *pScale if it is not NULL
-   void SetNumberScale(const NumberScale *pScale);
+   void SetNumberScale(const NumberScale &scale);
 
    // The ruler will not draw text within this (pixel) range.
    // Use this if you have another graphic object obscuring part
@@ -230,7 +229,7 @@ private:
    const ZoomInfo *mUseZoomInfo;
    int          mLeftOffset;
 
-   std::unique_ptr<NumberScale> mpNumberScale;
+   NumberScale mNumberScale;
 };
 
 class AUDACITY_DLL_API RulerPanel final : public wxPanelWrapper {