Preparations for scattering TrackArt functions to better places

src/Envelope.cpp

@@ -319,11 +319,14 @@ static void DrawPoint(wxDC & dc, const wxRect & r, int x, int y, bool top)
 
 /// TODO: This should probably move to track artist.
 void Envelope::DrawPoints
-(TrackPanelDrawingContext &context, const wxRect & r, const ZoomInfo &zoomInfo,
+(TrackPanelDrawingContext &context, const wxRect & r,
  bool dB, double dBRange,
  float zoomMin, float zoomMax, bool mirrored) const
 {
    auto &dc = context.dc;
+   const auto artist = TrackArtist::Get( context );
+   const auto &zoomInfo = *artist->pZoomInfo;
+
    bool highlight = false;
 #ifdef EXPERIMENTAL_TRACK_PANEL_HIGHLIGHTING
    auto target = dynamic_cast<EnvelopeHandle*>(context.target.get());
@@ -357,7 +360,7 @@ void Envelope::DrawPoints
                true, dBRange, false);
 
             // This follows the same logic as the envelop drawing in
-            // TrackArtist::DrawEnvelope().
+            // TrackArt::DrawEnvelope().
             // TODO: make this calculation into a reusable function.
             if (y2 - y < 9) {
                int value = (int)((zoomMax / (zoomMax - zoomMin)) * r.height);

src/Envelope.h

@@ -119,7 +119,7 @@ public:
 
    void DrawPoints(
       TrackPanelDrawingContext &context,
-      const wxRect & r, const ZoomInfo &zoomInfo,
+      const wxRect & r,
       bool dB, double dBRange,
       float zoomMin, float zoomMax, bool mirrored) const;
 

src/LabelTrack.cpp

@@ -782,11 +782,12 @@ namespace {
 ///   @param  dc the device context
 ///   @param  r  the LabelTrack rectangle.
 void LabelTrack::Draw
-(TrackPanelDrawingContext &context, const wxRect & r,
+( TrackPanelDrawingContext &context, const wxRect & r ) const
- const SelectedRegion &selectedRegion,
- const ZoomInfo &zoomInfo) const
 {
    auto &dc = context.dc;
+   const auto artist = TrackArtist::Get( context );
+   const auto &zoomInfo = *artist->pZoomInfo;
+
    auto pHit = findHit();
 
    if(msFont.Ok())
@@ -795,9 +796,9 @@ void LabelTrack::Draw
    if (mFontHeight == -1)
       calculateFontHeight(dc);
 
-   TrackArtist::DrawBackgroundWithSelection(&dc, r, this,
+   TrackArt::DrawBackgroundWithSelection( context, r, this,
       AColor::labelSelectedBrush, AColor::labelUnselectedBrush,
-         selectedRegion, zoomInfo);
+      ( GetSelected() || IsSyncLockSelected() ) );
 
    wxCoord textWidth, textHeight;
 

src/LabelTrack.h

@@ -153,9 +153,7 @@ class AUDACITY_DLL_API LabelTrack final : public Track
    static wxFont GetFont(const wxString &faceName, int size = DefaultFontSize);
    static void ResetFont();
 
-   void Draw(TrackPanelDrawingContext &context, const wxRect & r,
+   void Draw( TrackPanelDrawingContext &context, const wxRect & r ) const;
-             const SelectedRegion &selectedRegion,
-             const ZoomInfo &zoomInfo) const;
 
    int getSelectedIndex() const { return mSelIndex; }
 

src/Printing.cpp

@@ -88,7 +88,10 @@ bool AudacityPrintout::OnPrintPage(int WXUNUSED(page))
    artist.SetBackgroundBrushes(*wxWHITE_BRUSH, *wxWHITE_BRUSH,
                                *wxWHITE_PEN, *wxWHITE_PEN);
    const double screenDuration = mTracks->GetEndTime();
+   SelectedRegion region{};
+   artist.pSelectedRegion = &region;
    ZoomInfo zoomInfo(0.0, width / screenDuration);
+   artist.pZoomInfo = &zoomInfo;
    int y = rulerPageHeight;
 
    for (auto n : mTracks->Any()) {
@@ -98,9 +101,10 @@ bool AudacityPrintout::OnPrintPage(int WXUNUSED(page))
       r.width = width;
       r.height = (int)(n->GetHeight() * scale);
 
-      TrackPanelDrawingContext context{ *dc, {}, {} };
+      TrackPanelDrawingContext context{
-      artist.DrawTrack(
+         *dc, {}, {}, &artist
-         context, n, r, SelectedRegion(), zoomInfo, false, false, false, false);
+      };
+      TrackArt::DrawTrack( context, n, r );
 
       dc->SetPen(*wxBLACK_PEN);
       AColor::Line(*dc, 0, r.y, width, r.y);

src/TimeTrack.cpp

@@ -24,6 +24,7 @@
 #include "Envelope.h"
 #include "Prefs.h"
 #include "Project.h"
+#include "TrackArtist.h"
 #include "Internat.h"
 #include "ViewInfo.h"
 #include "AllThemeResources.h"
@@ -265,9 +266,12 @@ void TimeTrack::WriteXML(XMLWriter &xmlFile) const
 #include "tracks/ui/EnvelopeHandle.h"
 
 void TimeTrack::Draw
-(TrackPanelDrawingContext &context, const wxRect & r, const ZoomInfo &zoomInfo) const
+( TrackPanelDrawingContext &context, const wxRect & r ) const
 {
    auto &dc = context.dc;
+   const auto artist = TrackArtist::Get( context );
+   const auto &zoomInfo = *artist->pZoomInfo;
+
    bool highlight = false;
 #ifdef EXPERIMENTAL_TRACK_PANEL_HIGHLIGHTING
    auto target = dynamic_cast<EnvelopeHandle*>(context.target.get());

src/TimeTrack.h

@@ -66,8 +66,7 @@ class TimeTrack final : public Track {
    double GetEndTime() const override { return 0.0; }
 
    void Draw
-      (TrackPanelDrawingContext &context,
+      ( TrackPanelDrawingContext &context, const wxRect & r ) const;
-       const wxRect & r, const ZoomInfo &zoomInfo) const;
 
    // XMLTagHandler callback methods for loading and saving
 

src/TrackArtist.cpp

@@ -153,7 +153,7 @@ const int notePos[12] = { 1, 6, 11, 16, 21, 27,
 // IPITCH_TO_Y above, which computes coordinates relative to GetBottom()
 // Note the -NOTE_MARGIN, which leaves a little margin to draw notes that
 // are out of bounds. I'm not sure why the -2 is necessary.
-int TrackArtist::GetBottom(NoteTrack *t, const wxRect &rect)
+int TrackArt::GetBottom(NoteTrack *t, const wxRect &rect)
 {
    int bottomNote = t->GetBottomNote();
    int bottom = rect.y + rect.height - 2 - t->GetNoteMargin() +
@@ -173,12 +173,19 @@ TrackArtist::TrackArtist()
 
    SetColours(0);
    vruler = std::make_unique<Ruler>();
+
+   UpdatePrefs();
 }
 
 TrackArtist::~TrackArtist()
 {
 }
 
+TrackArtist * TrackArtist::Get( TrackPanelDrawingContext &context )
+{
+   return static_cast< TrackArtist* >( context.pUserData );
+}
+
 void TrackArtist::SetColours( int iColorIndex)
 {
    theTheme.SetBrushColour( blankBrush,      clrBlank );
@@ -226,32 +233,19 @@ void TrackArtist::SetColours( int iColorIndex)
    }
 }
 
-void TrackArtist::DrawTracks(TrackPanelDrawingContext &context,
+void TrackArt::DrawTracks(TrackPanelDrawingContext &context,
                              const TrackList * tracks,
                              const wxRegion & reg,
-                             const wxRect & clip, int leftOffset,
+                             const wxRect & clip)
-                             const SelectedRegion &selectedRegion,
-                             const ZoomInfo &zoomInfo,
-                             bool drawEnvelope,
-                             bool bigPoints,
-                             bool drawSliders)
 {
    // Fix the horizontal extent; will later change only the vertical extent.
+   const auto artist = TrackArtist::Get( context );
+   const auto leftOffset = artist->leftOffset;
    wxRect teamRect{
       clip.x + leftOffset, 0, clip.width - (leftOffset + kRightMargin), 0
    };
 
-   bool hasSolo = false;
+   const auto &zoomInfo = *artist->pZoomInfo;
-   for (const Track *t : *tracks) {
-      t = t->SubstitutePendingChangedTrack().get();
-      auto pt = dynamic_cast<const PlayableTrack *>(t);
-      if (pt && pt->GetSolo()) {
-         hasSolo = true;
-         break;
-      }
-   }
-
-   gPrefs->Read(wxT("/GUI/ShowTrackNameInWaveform"), &mbShowTrackNameInWaveform, false);
 
    for(auto leader : tracks->Leaders()) {
       auto group = TrackList::Channels( leader );
@@ -285,31 +279,26 @@ void TrackArtist::DrawTracks(TrackPanelDrawingContext &context,
                teamRect.width,
                t->GetHeight() - (kTopMargin + kBottomMargin)
             };
-            DrawTrack(context, t, trackRect,
+            DrawTrack( context, t, trackRect );
-                      selectedRegion, zoomInfo,
-                      drawEnvelope, bigPoints, drawSliders, hasSolo);
          }
       }
    }
 }
 
-void TrackArtist::DrawTrack(TrackPanelDrawingContext &context,
+void TrackArt::DrawTrack(TrackPanelDrawingContext &context,
                             const Track * t,
-                            const wxRect & rect,
+                            const wxRect & rect)
-                            const SelectedRegion &selectedRegion,
-                            const ZoomInfo &zoomInfo,
-                            bool drawEnvelope,
-                            bool bigPoints,
-                            bool drawSliders,
-                            bool hasSolo)
 {
    auto &dc = context.dc;
+
    t->TypeSwitch(
       [&](const WaveTrack *wt) {
          for (const auto &clip : wt->GetClips()) {
             clip->ClearDisplayRect();
          }
 
+         const auto artist = TrackArtist::Get( context );
+         const auto hasSolo = artist->hasSolo;
          bool muted = (hasSolo || wt->GetMute()) &&
             !wt->GetSolo();
 
@@ -320,11 +309,10 @@ void TrackArtist::DrawTrack(TrackPanelDrawingContext &context,
 
          switch (wt->GetDisplay()) {
          case WaveTrack::Waveform:
-            DrawWaveform(context, wt, rect, selectedRegion, zoomInfo,
+            DrawWaveform(context, wt, rect, muted);
-                         drawEnvelope,  bigPoints, drawSliders, muted);
             break;
          case WaveTrack::Spectrum:
-            DrawSpectrum(wt, dc, rect, selectedRegion, zoomInfo);
+            DrawSpectrum( context, wt, rect );
             break;
          default:
             wxASSERT(false);
@@ -334,7 +322,9 @@ void TrackArtist::DrawTrack(TrackPanelDrawingContext &context,
          dc.GetGraphicsContext()->SetAntialiasMode(aamode);
    #endif
 
-         if (mbShowTrackNameInWaveform &&
+         const auto bShowTrackNameInWaveform =
+            artist->mbShowTrackNameInWaveform;
+         if (bShowTrackNameInWaveform &&
              wt->IsLeader() &&
              // Exclude empty name.
              !wt->GetName().IsEmpty()) {
@@ -354,21 +344,23 @@ void TrackArtist::DrawTrack(TrackPanelDrawingContext &context,
       [&](const NoteTrack *nt) {
          bool muted = false;
 #ifdef EXPERIMENTAL_MIDI_OUT
+         const auto artist = TrackArtist::Get( context );
+         const auto hasSolo = artist->hasSolo;
          muted = (hasSolo || nt->GetMute()) && !nt->GetSolo();
 #endif
-         DrawNoteTrack(nt, dc, rect, selectedRegion, zoomInfo, muted);
+         DrawNoteTrack( context, nt, rect, muted );
       },
    #endif // USE_MIDI
       [&](const LabelTrack *lt) {
-         DrawLabelTrack(context, lt, rect, selectedRegion, zoomInfo);
+         lt->Draw( context, rect );
       },
       [&](const TimeTrack *tt) {
-         DrawTimeTrack(context, tt, rect, zoomInfo);
+         DrawTimeTrack( context, tt, rect );
       }
    );
 }
 
-void TrackArtist::DrawVRuler
+void TrackArt::DrawVRuler
 ( TrackPanelDrawingContext &context, const Track *t, const wxRect & rect_,
   bool bSelected )
 {
@@ -418,8 +410,10 @@ void TrackArtist::DrawVRuler
             rr.width -= adj;
          }
 
-         UpdateVRuler(t, rr);
+         const auto artist = TrackArtist::Get( context );
+         artist->UpdateVRuler(t, rr);
 
+         const auto &vruler = artist->vruler;
          vruler->SetTickColour( theTheme.Colour( clrTrackPanelText ));
          vruler->Draw(*dc);
       },
@@ -441,8 +435,10 @@ void TrackArtist::DrawVRuler
             rr.width -= adj;
          }
 
-         UpdateVRuler(t, rr);
+         const auto artist = TrackArtist::Get( context );
+         artist->UpdateVRuler(t, rr);
 
+         const auto &vruler = artist->vruler;
          vruler->SetTickColour( theTheme.Colour( clrTrackPanelText ));
          vruler->Draw(*dc);
       }
@@ -451,7 +447,8 @@ void TrackArtist::DrawVRuler
       ,
       [&](const NoteTrack *track) {
       // The note track draws a vertical keyboard to label pitches
-         UpdateVRuler(t, rect);
+         const auto artist = TrackArtist::Get( context );
+         artist->UpdateVRuler(t, rect);
 
          dc->SetPen(highlight ? AColor::uglyPen : *wxTRANSPARENT_PEN);
          dc->SetBrush(*wxWHITE_BRUSH);
@@ -899,8 +896,11 @@ float ValueOfPixel(int yy, int height, bool offset,
    return v;
 }
 
-void TrackArtist::DrawNegativeOffsetTrackArrows(wxDC &dc, const wxRect &rect)
+void TrackArt::DrawNegativeOffsetTrackArrows(
+   TrackPanelDrawingContext &context, const wxRect &rect )
 {
+   auto &dc = context.dc;
+
    // Draws two black arrows on the left side of the track to
    // indicate the user that the track has been time-shifted
    // to the left beyond t=0.0.
@@ -926,16 +926,19 @@ void TrackArtist::DrawNegativeOffsetTrackArrows(wxDC &dc, const wxRect &rect)
                 rect.x + 6, rect.y + rect.height - 12);
 }
 
-void TrackArtist::DrawWaveformBackground(wxDC &dc, int leftOffset, const wxRect &rect,
+void TrackArt::DrawWaveformBackground(TrackPanelDrawingContext &context,
+                                         int leftOffset, const wxRect &rect,
                                          const double env[],
                                          float zoomMin, float zoomMax,
                                          int zeroLevelYCoordinate,
                                          bool dB, float dBRange,
                                          double t0, double t1,
-                                         const ZoomInfo &zoomInfo,
+                                         bool bIsSyncLockSelected,
-                                         bool drawEnvelope, bool bIsSyncLockSelected,
                                          bool highlightEnvelope)
 {
+   auto &dc = context.dc;
+   const auto artist = TrackArtist::Get( context );
+   const auto &zoomInfo = *artist->pZoomInfo;
 
    // Visually (one vertical slice of the waveform background, on its side;
    // the "*" is the actual waveform background we're drawing
@@ -956,6 +959,10 @@ void TrackArtist::DrawWaveformBackground(wxDC &dc, int leftOffset, const wxRect
    int xx, lx = 0;
    int l, w;
 
+   const auto &blankBrush = artist->blankBrush;
+   const auto &selectedBrush = artist->selectedBrush;
+   const auto &unselectedBrush = artist->unselectedBrush;
+
    dc.SetPen(*wxTRANSPARENT_PEN);
    dc.SetBrush(blankBrush);
    dc.DrawRectangle(rect);
@@ -981,6 +988,7 @@ void TrackArtist::DrawWaveformBackground(wxDC &dc, int leftOffset, const wxRect
       mintop +=1;
       minbot +=1;
 
+      const auto drawEnvelope = artist->drawEnvelope;
       if (!drawEnvelope || maxbot > mintop) {
          maxbot = halfHeight;
          mintop = halfHeight;
@@ -1041,7 +1049,8 @@ void TrackArtist::DrawWaveformBackground(wxDC &dc, int leftOffset, const wxRect
    if (bIsSyncLockSelected && t0 < t1) {
       const int begin = std::max(0, std::min(rect.width, (int)(zoomInfo.TimeToPosition(t0, -leftOffset))));
       const int end = std::max(0, std::min(rect.width, (int)(zoomInfo.TimeToPosition(t1, -leftOffset))));
-      DrawSyncLockTiles(&dc, wxRect(rect.x + begin, rect.y, end - 1 - begin, rect.height));
+      DrawSyncLockTiles( context,
+         { rect.x + begin, rect.y, end - 1 - begin, rect.height } );
    }
 
    //OK, the display bounds are between min and max, which
@@ -1055,12 +1064,15 @@ void TrackArtist::DrawWaveformBackground(wxDC &dc, int leftOffset, const wxRect
 }
 
 
-void TrackArtist::DrawMinMaxRMS(wxDC &dc, const wxRect & rect, const double env[],
+void TrackArt::DrawMinMaxRMS(
+   TrackPanelDrawingContext &context, const wxRect & rect, const double env[],
    float zoomMin, float zoomMax,
    bool dB, float dBRange,
    const float *min, const float *max, const float *rms, const int *bl,
    bool /* showProgress */, bool muted)
 {
+   auto &dc = context.dc;
+
    // Display a line representing the
    // min and max of the samples in this region
    int lasth1 = std::numeric_limits<int>::max();
@@ -1072,7 +1084,9 @@ void TrackArtist::DrawMinMaxRMS(wxDC &dc, const wxRect & rect, const double env[
    ArrayOf<int> clipped;
    int clipcnt = 0;
 
-   if (mShowClipping) {
+   const auto artist = TrackArtist::Get( context );
+   const auto bShowClipping = artist->mShowClipping;
+   if (bShowClipping) {
       clipped.reinit( size_t(rect.width) );
    }
 
@@ -1082,12 +1096,15 @@ void TrackArtist::DrawMinMaxRMS(wxDC &dc, const wxRect & rect, const double env[
    bool drawStripes = true;
    bool drawWaveform = true;
 
+   const auto &muteSamplePen = artist->muteSamplePen;
+   const auto &samplePen = artist->samplePen;
+
    dc.SetPen(muted ? muteSamplePen : samplePen);
    for (int x0 = 0; x0 < rect.width; ++x0) {
       int xx = rect.x + x0;
       double v;
       v = min[x0] * env[x0];
-      if (clipped && mShowClipping && (v <= -MAX_AUDIO))
+      if (clipped && bShowClipping && (v <= -MAX_AUDIO))
       {
          if (clipcnt == 0 || clipped[clipcnt - 1] != xx) {
             clipped[clipcnt++] = xx;
@@ -1097,7 +1114,7 @@ void TrackArtist::DrawMinMaxRMS(wxDC &dc, const wxRect & rect, const double env[
                        rect.height, dB, true, dBRange, true);
 
       v = max[x0] * env[x0];
-      if (clipped && mShowClipping && (v >= MAX_AUDIO))
+      if (clipped && bShowClipping && (v >= MAX_AUDIO))
       {
          if (clipcnt == 0 || clipped[clipcnt - 1] != xx) {
             clipped[clipcnt++] = xx;
@@ -1170,6 +1187,9 @@ void TrackArtist::DrawMinMaxRMS(wxDC &dc, const wxRect & rect, const double env[
    }
 
    // Stroke rms over the min-max
+   const auto &muteRmsPen = artist->muteRmsPen;
+   const auto &rmsPen = artist->rmsPen;
+
    dc.SetPen(muted ? muteRmsPen : rmsPen);
    for (int x0 = 0; x0 < rect.width; ++x0) {
       int xx = rect.x + x0;
@@ -1182,6 +1202,9 @@ void TrackArtist::DrawMinMaxRMS(wxDC &dc, const wxRect & rect, const double env[
 
    // Draw the clipping lines
    if (clipcnt) {
+      const auto &muteClippedPen = artist->muteClippedPen;
+      const auto &clippedPen = artist->clippedPen;
+
       dc.SetPen(muted ? muteClippedPen : clippedPen);
       while (--clipcnt >= 0) {
          int xx = clipped[clipcnt];
@@ -1190,14 +1213,18 @@ void TrackArtist::DrawMinMaxRMS(wxDC &dc, const wxRect & rect, const double env[
    }
 }
 
-void TrackArtist::DrawIndividualSamples(wxDC &dc, int leftOffset, const wxRect &rect,
+void TrackArt::DrawIndividualSamples(TrackPanelDrawingContext &context,
+                                        int leftOffset, const wxRect &rect,
                                         float zoomMin, float zoomMax,
                                         bool dB, float dBRange,
                                         const WaveClip *clip,
-                                        const ZoomInfo &zoomInfo,
+                                        bool showPoints, bool muted,
-                                        bool bigPoints, bool showPoints, bool muted,
                                         bool highlight)
 {
+   auto &dc = context.dc;
+   const auto artist = TrackArtist::Get( context );
+   const auto &zoomInfo = *artist->pZoomInfo;
+
    const double toffset = clip->GetOffset();
    double rate = clip->GetRate();
    const double t0 = std::max(0.0, zoomInfo.PositionToTime(0, -leftOffset) - toffset);
@@ -1226,9 +1253,12 @@ void TrackArtist::DrawIndividualSamples(wxDC &dc, int leftOffset, const wxRect &
    ArrayOf<int> clipped;
    int clipcnt = 0;
 
-   if (mShowClipping)
+   const auto bShowClipping = artist->mShowClipping;
+   if (bShowClipping)
       clipped.reinit( size_t(slen) );
 
+   const auto &muteSamplePen = artist->muteSamplePen;
+   const auto &samplePen = artist->samplePen;
    auto &pen = highlight ? AColor::uglyPen : muted ? muteSamplePen : samplePen;
    dc.SetPen( pen );
 
@@ -1244,7 +1274,7 @@ void TrackArtist::DrawIndividualSamples(wxDC &dc, int leftOffset, const wxRect &
          clip->GetEnvelope()->GetValue( time, 1.0 / clip->GetRate() );
       const double tt = buffer[s] * value;
 
-      if (clipped && mShowClipping && ((tt <= -MAX_AUDIO) || (tt >= MAX_AUDIO)))
+      if (clipped && bShowClipping && ((tt <= -MAX_AUDIO) || (tt >= MAX_AUDIO)))
          clipped[clipcnt++] = xx;
       ypos[s] =
          std::max(-1,
@@ -1256,11 +1286,14 @@ void TrackArtist::DrawIndividualSamples(wxDC &dc, int leftOffset, const wxRect &
 
    if (showPoints) {
       // Draw points where spacing is enough
+      const auto bigPoints = artist->bigPoints;
       const int tickSize = bigPoints ? 4 : 3;// Bigger ellipses when draggable.
       wxRect pr;
       pr.width = tickSize;
       pr.height = tickSize;
       //different colour when draggable.
+      const auto &dragsampleBrush = artist->dragsampleBrush;
+      const auto &sampleBrush = artist->sampleBrush;
       auto &brush = highlight
          ? AColor::uglyBrush
          : bigPoints ? dragsampleBrush : sampleBrush;
@@ -1274,7 +1307,8 @@ void TrackArtist::DrawIndividualSamples(wxDC &dc, int leftOffset, const wxRect &
       }
    }
 
-   if (showPoints && (mSampleDisplay == (int) WaveTrack::StemPlot)) {
+   const auto sampleDisplay = artist->mSampleDisplay;
+   if (showPoints && (sampleDisplay == (int) WaveTrack::StemPlot)) {
       // Draw vertical lines
       int yZero = GetWaveYPos(0.0, zoomMin, zoomMax, rect.height, dB, true, dBRange, false);
       yZero = rect.y + std::max(-1, std::min(rect.height, yZero));
@@ -1295,6 +1329,8 @@ void TrackArtist::DrawIndividualSamples(wxDC &dc, int leftOffset, const wxRect &
 
    // Draw clipping
    if (clipcnt) {
+      const auto &muteClippedPen = artist->muteClippedPen;
+      const auto &clippedPen = artist->clippedPen;
       dc.SetPen(muted ? muteClippedPen : clippedPen);
       while (--clipcnt >= 0) {
          auto s = clipped[clipcnt];
@@ -1303,10 +1339,13 @@ void TrackArtist::DrawIndividualSamples(wxDC &dc, int leftOffset, const wxRect &
    }
 }
 
-void TrackArtist::DrawEnvelope(wxDC &dc, const wxRect &rect, const double env[],
+void TrackArt::DrawEnvelope(TrackPanelDrawingContext &context,
+                               const wxRect &rect, const double env[],
                                float zoomMin, float zoomMax,
                                bool dB, float dBRange, bool highlight)
 {
+   auto &dc = context.dc;
+
    int h = rect.height;
 
    auto &pen = highlight ? AColor::uglyPen : AColor::envelopePen;
@@ -1332,13 +1371,17 @@ void TrackArtist::DrawEnvelope(wxDC &dc, const wxRect &rect, const double env[],
          cenvBot = value + 4;
       }
 
-      DrawEnvLine(dc, rect, x0, envTop, cenvTop, true);
+      DrawEnvLine( context, rect, x0, envTop, cenvTop, true );
-      DrawEnvLine(dc, rect, x0, envBot, cenvBot, false);
+      DrawEnvLine( context, rect, x0, envBot, cenvBot, false );
    }
 }
 
-void TrackArtist::DrawEnvLine(wxDC &dc, const wxRect &rect, int x0, int y0, int cy, bool top)
+void TrackArt::DrawEnvLine(
+   TrackPanelDrawingContext &context,
+   const wxRect &rect, int x0, int y0, int cy, bool top )
 {
+   auto &dc = context.dc;
+
    int xx = rect.x + x0;
    int yy = rect.y + cy;
 
@@ -1364,17 +1407,13 @@ void TrackArtist::DrawEnvLine(wxDC &dc, const wxRect &rect, int x0, int y0, int
 
 #include "tracks/ui/TimeShiftHandle.h"
 #include "tracks/playabletrack/wavetrack/ui/CutlineHandle.h"
-void TrackArtist::DrawWaveform(TrackPanelDrawingContext &context,
+void TrackArt::DrawWaveform(TrackPanelDrawingContext &context,
                                const WaveTrack *track,
                                const wxRect & rect,
-                               const SelectedRegion &selectedRegion,
-                               const ZoomInfo &zoomInfo,
-                               bool drawEnvelope,
-                               bool bigPoints,
-                               bool drawSliders,
                                bool muted)
 {
    auto &dc = context.dc;
+   const auto artist = TrackArtist::Get( context );
 
    bool highlight = false;
    bool gripHit = false;
@@ -1386,17 +1425,20 @@ void TrackArtist::DrawWaveform(TrackPanelDrawingContext &context,
 
    const bool dB = !track->GetWaveformSettings().isLinear();
 
-   DrawBackgroundWithSelection(&dc, rect, track, blankSelectedBrush, blankBrush,
+   const auto &blankSelectedBrush = artist->blankSelectedBrush;
-         selectedRegion, zoomInfo);
+   const auto &blankBrush = artist->blankBrush;
+   DrawBackgroundWithSelection(
+      context, rect, track, blankSelectedBrush, blankBrush );
 
    for (const auto &clip: track->GetClips())
-      DrawClipWaveform(context, track, clip.get(), rect, selectedRegion, zoomInfo,
+      DrawClipWaveform(context, track, clip.get(), rect,
-                       drawEnvelope, bigPoints,
                        dB, muted);
 
    // Update cache for locations, e.g. cutlines and merge points
    track->UpdateLocationsCache();
 
+   const auto &zoomInfo = *artist->pZoomInfo;
+
 #ifdef EXPERIMENTAL_TRACK_PANEL_HIGHLIGHTING
    auto target2 = dynamic_cast<CutlineHandle*>(context.target.get());
 #endif
@@ -1428,9 +1470,10 @@ void TrackArtist::DrawWaveform(TrackPanelDrawingContext &context,
       }
    }
 
+   const auto drawSliders = artist->drawSliders;
    if (drawSliders) {
-      DrawTimeSlider(dc, rect, true, highlight && gripHit);  // directed right
+      DrawTimeSlider( context, rect, true, highlight && gripHit );  // directed right
-      DrawTimeSlider(dc, rect, false, highlight && gripHit); // directed left
+      DrawTimeSlider( context, rect, false, highlight && gripHit ); // directed left
    }
 }
 
@@ -1651,18 +1694,18 @@ void FindWavePortions
 
 #include "tracks/playabletrack/wavetrack/ui/SampleHandle.h"
 #include "tracks/ui/EnvelopeHandle.h"
-void TrackArtist::DrawClipWaveform(TrackPanelDrawingContext &context,
+void TrackArt::DrawClipWaveform(TrackPanelDrawingContext &context,
                                    const WaveTrack *track,
                                    const WaveClip *clip,
                                    const wxRect & rect,
-                                   const SelectedRegion &selectedRegion,
-                                   const ZoomInfo &zoomInfo,
-                                   bool drawEnvelope,
-                                   bool bigPoints,
                                    bool dB,
                                    bool muted)
 {
    auto &dc = context.dc;
+   const auto artist = TrackArtist::Get( context );
+   const auto &selectedRegion = *artist->pSelectedRegion;
+   const auto &zoomInfo = *artist->pZoomInfo;
+
 #ifdef PROFILE_WAVEFORM
    Profiler profiler;
 #endif
@@ -1673,7 +1716,8 @@ void TrackArtist::DrawClipWaveform(TrackPanelDrawingContext &context,
    highlightEnvelope = target && target->GetEnvelope() == clip->GetEnvelope();
 #endif
 
-   const ClipParameters params(false, track, clip, rect, selectedRegion, zoomInfo);
+   const ClipParameters params{
+      false, track, clip, rect, selectedRegion, zoomInfo };
    const wxRect &hiddenMid = params.hiddenMid;
    // The "hiddenMid" rect contains the part of the display actually
    // containing the waveform, as it appears without the fisheye.  If it's empty, we're done.
@@ -1696,7 +1740,7 @@ void TrackArtist::DrawClipWaveform(TrackPanelDrawingContext &context,
 
    dc.SetPen(*wxTRANSPARENT_PEN);
    int iColorIndex = clip->GetColourIndex();
-   SetColours( iColorIndex );
+   artist->SetColours( iColorIndex );
 
    // If we get to this point, the clip is actually visible on the
    // screen, so remember the display rectangle.
@@ -1729,12 +1773,12 @@ void TrackArtist::DrawClipWaveform(TrackPanelDrawingContext &context,
       }
       else
          tt0 = tt1 = 0.0;
-      DrawWaveformBackground(dc, leftOffset, mid,
+      DrawWaveformBackground(context, leftOffset, mid,
          env,
          zoomMin, zoomMax,
          track->ZeroLevelYCoordinate(mid),
          dB, dBRange,
-         tt0, tt1, zoomInfo, drawEnvelope,
+         tt0, tt1,
          !track->GetSelected(), highlightEnvelope);
    }
 
@@ -1857,7 +1901,7 @@ void TrackArtist::DrawClipWaveform(TrackPanelDrawingContext &context,
                  0, // 1.0 / rate,
 
                  env2, rectPortion.width, leftOffset, zoomInfo );
-            DrawMinMaxRMS(dc, rectPortion, env2,
+            DrawMinMaxRMS( context, rectPortion, env2,
                zoomMin, zoomMax,
                dB, dBRange,
                useMin, useMax, useRms, useBl,
@@ -1869,26 +1913,29 @@ void TrackArtist::DrawClipWaveform(TrackPanelDrawingContext &context,
             auto target = dynamic_cast<SampleHandle*>(context.target.get());
             highlight = target && target->GetTrack().get() == track;
 #endif
-            DrawIndividualSamples(dc, leftOffset, rectPortion, zoomMin, zoomMax,
+            DrawIndividualSamples(
+               context, leftOffset, rectPortion, zoomMin, zoomMax,
                dB, dBRange,
-               clip, zoomInfo,
+               clip,
-               bigPoints, showPoints, muted, highlight);
+               showPoints, muted, highlight );
          }
       }
 
       leftOffset += rectPortion.width + skippedRight;
    }
 
+   const auto drawEnvelope = artist->drawEnvelope;
    if (drawEnvelope) {
-      DrawEnvelope(dc, mid, env, zoomMin, zoomMax, dB, dBRange, highlightEnvelope);
+      DrawEnvelope(
+         context, mid, env, zoomMin, zoomMax, dB, dBRange, highlightEnvelope );
       clip->GetEnvelope()->DrawPoints
-         (context, rect, zoomInfo, dB, dBRange, zoomMin, zoomMax, true);
+         ( context, rect, dB, dBRange, zoomMin, zoomMax, true );
    }
 
    // Draw arrows on the left side if the track extends to the left of the
    // beginning of time.  :)
    if (h == 0.0 && tOffset < 0.0) {
-      DrawNegativeOffsetTrackArrows(dc, rect);
+      DrawNegativeOffsetTrackArrows( context, rect );
    }
 
    // Draw clip edges
@@ -1906,10 +1953,12 @@ void TrackArtist::DrawClipWaveform(TrackPanelDrawingContext &context,
 }
 
 
-void TrackArtist::DrawTimeSlider(wxDC & dc,
+void TrackArt::DrawTimeSlider( TrackPanelDrawingContext &context,
                                   const wxRect & rect,
                                   bool rightwards, bool highlight )
 {
+   auto &dc = context.dc;
+
    const int border = 3; // 3 pixels all round.
    const int width = 6; // width of the drag box.
    const int taper = 6; // how much the box tapers by.
@@ -1962,19 +2011,19 @@ void TrackArtist::DrawTimeSlider(wxDC & dc,
    }
 }
 
-void TrackArtist::DrawSpectrum(const WaveTrack *track,
+void TrackArt::DrawSpectrum( TrackPanelDrawingContext &context,
-                               wxDC & dc,
+                                const WaveTrack *track,
-                               const wxRect & rect,
+                                const wxRect & rect )
-                               const SelectedRegion &selectedRegion,
-                               const ZoomInfo &zoomInfo)
 {
-   DrawBackgroundWithSelection(&dc, rect, track, blankSelectedBrush, blankBrush,
+   const auto artist = TrackArtist::Get( context );
-         selectedRegion, zoomInfo);
+   const auto &blankSelectedBrush = artist->blankSelectedBrush;
+   const auto &blankBrush = artist->blankBrush;
+   DrawBackgroundWithSelection(
+      context, rect, track, blankSelectedBrush, blankBrush );
 
    WaveTrackCache cache(Track::Pointer<const WaveTrack>(track));
-   for (const auto &clip: track->GetClips()) {
+   for (const auto &clip: track->GetClips())
-      DrawClipSpectrum(cache, clip.get(), dc, rect, selectedRegion, zoomInfo);
+      DrawClipSpectrum( context, cache, clip.get(), rect );
-   }
 }
 
 static inline float findValue
@@ -2058,13 +2107,16 @@ AColor::ColorGradientChoice ChooseColorSet( float bin0, float bin1, float selBin
 }
 
 
-void TrackArtist::DrawClipSpectrum(WaveTrackCache &waveTrackCache,
+void TrackArt::DrawClipSpectrum(TrackPanelDrawingContext &context,
+                                   WaveTrackCache &waveTrackCache,
                                    const WaveClip *clip,
-                                   wxDC & dc,
+                                   const wxRect & rect)
-                                   const wxRect & rect,
-                                   const SelectedRegion &selectedRegion,
-                                   const ZoomInfo &zoomInfo)
 {
+   auto &dc = context.dc;
+   const auto artist = TrackArtist::Get( context );
+   const auto &selectedRegion = *artist->pSelectedRegion;
+   const auto &zoomInfo = *artist->pZoomInfo;
+
 #ifdef PROFILE_WAVEFORM
    Profiler profiler;
 #endif
@@ -2075,7 +2127,8 @@ void TrackArtist::DrawClipSpectrum(WaveTrackCache &waveTrackCache,
 
    enum { DASH_LENGTH = 10 /* pixels */ };
 
-   const ClipParameters params(true, track, clip, rect, selectedRegion, zoomInfo);
+   const ClipParameters params{
+      true, track, clip, rect, selectedRegion, zoomInfo };
    const wxRect &hiddenMid = params.hiddenMid;
    // The "hiddenMid" rect contains the part of the display actually
    // containing the waveform, as it appears without the fisheye.  If it's empty, we're done.
@@ -2676,13 +2729,17 @@ int PitchToY(double p, int bottom)
    sel is equal to rect, and the entire region is drawn with unselected
    background colors.
  */
-void TrackArtist::DrawNoteBackground(const NoteTrack *track, wxDC &dc,
+void TrackArt::DrawNoteBackground(TrackPanelDrawingContext &context,
+                                     const NoteTrack *track,
                                      const wxRect &rect, const wxRect &sel,
-                                     const ZoomInfo &zoomInfo,
                                      const wxBrush &wb, const wxPen &wp,
                                      const wxBrush &bb, const wxPen &bp,
                                      const wxPen &mp)
 {
+   auto &dc = context.dc;
+   const auto artist = TrackArtist::Get( context );
+   const auto &zoomInfo = *artist->pZoomInfo;
+
    dc.SetBrush(wb);
    dc.SetPen(wp);
 #ifndef EXPERIMENTAL_NOTETRACK_OVERLAY
@@ -2772,13 +2829,16 @@ graphics. Since there may be notes outside of the display region,
 reserve a half-note-height margin at the top and bottom of the
 window and draw out-of-bounds notes here instead.
 */
-void TrackArtist::DrawNoteTrack(const NoteTrack *track,
+void TrackArt::DrawNoteTrack(TrackPanelDrawingContext &context,
-                                wxDC & dc,
+                                const NoteTrack *track,
                                 const wxRect & rect,
-                                const SelectedRegion &selectedRegion,
-                                const ZoomInfo &zoomInfo,
                                 bool muted)
 {
+   auto &dc = context.dc;
+   const auto artist = TrackArtist::Get( context );
+   const auto &selectedRegion = *artist->pSelectedRegion;
+   const auto &zoomInfo = *artist->pZoomInfo;
+
    SonifyBeginNoteBackground();
    double sel0 = selectedRegion.t0();
    double sel1 = selectedRegion.t1();
@@ -2803,9 +2863,8 @@ void TrackArtist::DrawNoteTrack(const NoteTrack *track,
    track->PrepareIPitchToY(rect);
 
 #ifdef EXPERIMENTAL_NOTETRACK_OVERLAY
-   DrawBackgroundWithSelection(&dc, rect, track,
+   DrawBackgroundWithSelection(context, rect, track,
-         AColor::labelSelectedBrush, AColor::labelUnselectedBrush,
+         AColor::labelSelectedBrush, AColor::labelUnselectedBrush);
-         selectedRegion, zoomInfo);
 #endif
 
    // Background comes in 4 colors, that are now themed.
@@ -2821,7 +2880,9 @@ void TrackArtist::DrawNoteTrack(const NoteTrack *track,
    wxPen barLinePen;
    barLinePen.SetColour(theTheme.Colour( clrMidiLines));
 
-   DrawNoteBackground(track, dc, rect, rect, zoomInfo, blankBrush, blankPen,
+   const auto &blankBrush = artist->blankBrush;
+   const auto &blankPen = artist->blankPen;
+   DrawNoteBackground(context, track, rect, rect, blankBrush, blankPen,
                       blackStripeBrush, blackStripePen, barLinePen);
 
    dc.SetClippingRegion(rect);
@@ -2849,7 +2910,7 @@ void TrackArtist::DrawNoteTrack(const NoteTrack *track,
    wxPen selectedBarLinePen;
    selectedBarLinePen.SetColour(theTheme.Colour( clrMidiLines));
 
-   DrawNoteBackground(track, dc, rect, selBG, zoomInfo,
+   DrawNoteBackground(context, track, rect, selBG,
                       selectedWhiteKeyBrush, selectedWhiteKeyPen,
                       selectedBlackKeyBrush, selectedBlackKeyPen,
                       selectedBarLinePen);
@@ -3124,7 +3185,7 @@ void TrackArtist::DrawNoteTrack(const NoteTrack *track,
                 rect.x + rect.width, rect.y + rect.height - marg - 1); // top of line
 
    if (h == 0.0 && track->GetOffset() < 0.0) {
-      DrawNegativeOffsetTrackArrows(dc, rect);
+      DrawNegativeOffsetTrackArrows( context, rect );
    }
 
    dc.DestroyClippingRegion();
@@ -3133,38 +3194,24 @@ void TrackArtist::DrawNoteTrack(const NoteTrack *track,
 #endif // USE_MIDI
 
 
-void TrackArtist::DrawLabelTrack(TrackPanelDrawingContext &context,
+void TrackArt::DrawTimeTrack(TrackPanelDrawingContext &context,
-                                 const LabelTrack *track,
-                                 const wxRect & rect,
-                                 const SelectedRegion &selectedRegion,
-                                 const ZoomInfo &zoomInfo)
-{
-   double sel0 = selectedRegion.t0();
-   double sel1 = selectedRegion.t1();
-
-   if (!track->GetSelected() && !track->IsSyncLockSelected())
-      sel0 = sel1 = 0.0;
-
-   track->Draw(context, rect, SelectedRegion(sel0, sel1), zoomInfo);
-}
-
-void TrackArtist::DrawTimeTrack(TrackPanelDrawingContext &context,
                                 const TimeTrack *track,
-                                const wxRect & rect,
+                                const wxRect & rect)
-                                const ZoomInfo &zoomInfo)
 {
-   track->Draw(context, rect, zoomInfo);
+   track->Draw( context, rect );
    wxRect envRect = rect;
    envRect.height -= 2;
    double lower = track->GetRangeLower(), upper = track->GetRangeUpper();
+   const auto artist = TrackArtist::Get( context );
+   const auto dbRange = artist->mdBrange;
    if(track->GetDisplayLog()) {
       // MB: silly way to undo the work of GetWaveYPos while still getting a logarithmic scale
-      lower = LINEAR_TO_DB(std::max(1.0e-7, lower)) / mdBrange + 1.0;
+      lower = LINEAR_TO_DB(std::max(1.0e-7, lower)) / dbRange + 1.0;
-      upper = LINEAR_TO_DB(std::max(1.0e-7, upper)) / mdBrange + 1.0;
+      upper = LINEAR_TO_DB(std::max(1.0e-7, upper)) / dbRange + 1.0;
    }
    track->GetEnvelope()->DrawPoints
-      (context, envRect, zoomInfo,
+      ( context, envRect,
-       track->GetDisplayLog(), mdBrange, lower, upper, false);
+        track->GetDisplayLog(), dbRange, lower, upper, false );
 }
 
 void TrackArtist::UpdatePrefs()
@@ -3172,6 +3219,10 @@ void TrackArtist::UpdatePrefs()
    mdBrange = gPrefs->Read(ENV_DB_KEY, mdBrange);
    mShowClipping = gPrefs->Read(wxT("/GUI/ShowClipping"), mShowClipping);
    mSampleDisplay = TracksPrefs::SampleViewChoice();
+
+   mbShowTrackNameInWaveform =
+      gPrefs->ReadBool(wxT("/GUI/ShowTrackNameInWaveform"), false);
+   
    SetColours(0);
 }
 
@@ -3188,8 +3239,11 @@ void TrackArtist::UpdatePrefs()
 // 5x5 box.
 //
 // There may be a better way to do this, or a more appealing pattern.
-void TrackArtist::DrawSyncLockTiles(wxDC *dc, const wxRect &rect)
+void TrackArt::DrawSyncLockTiles(
+   TrackPanelDrawingContext &context, const wxRect &rect )
 {
+   const auto dc = &context.dc;
+
    wxBitmap syncLockBitmap(theTheme.Image(bmpSyncLockSelTile));
 
    // Grid spacing is a bit smaller than actual image size
@@ -3295,13 +3349,19 @@ void TrackArtist::DrawSyncLockTiles(wxDC *dc, const wxRect &rect)
    }
 }
 
-void TrackArtist::DrawBackgroundWithSelection(wxDC *dc, const wxRect &rect,
+void TrackArt::DrawBackgroundWithSelection(
+   TrackPanelDrawingContext &context, const wxRect &rect,
    const Track *track, const wxBrush &selBrush, const wxBrush &unselBrush,
-   const SelectedRegion &selectedRegion, const ZoomInfo &zoomInfo)
+   bool useSelection)
 {
+   const auto dc = &context.dc;
+   const auto artist = TrackArtist::Get( context );
+   const auto &selectedRegion = *artist->pSelectedRegion;
+   const auto &zoomInfo = *artist->pZoomInfo;
+
    //MM: Draw background. We should optimize that a bit more.
-   const double sel0 = selectedRegion.t0();
+   const double sel0 = useSelection ? selectedRegion.t0() : 0.0;
-   const double sel1 = selectedRegion.t1();
+   const double sel1 = useSelection ? selectedRegion.t1() : 0.0;
 
    dc->SetPen(*wxTRANSPARENT_PEN);
    if (track->GetSelected() || track->IsSyncLockSelected())
@@ -3337,7 +3397,7 @@ void TrackArtist::DrawBackgroundWithSelection(wxDC *dc, const wxRect &rect,
             // Per condition above, track must be sync-lock selected
             dc->SetBrush(unselBrush);
             dc->DrawRectangle(within);
-            DrawSyncLockTiles(dc, within);
+            DrawSyncLockTiles( context, within );
          }
 
          after.x = 1 + within.GetRight();

src/TrackArtist.h

@@ -24,7 +24,6 @@
 #include "Experimental.h"
 #include "audacity/Types.h"
 
-class wxDC;
 class wxRect;
 class wxHashTable;
 
@@ -47,33 +46,114 @@ struct TrackPanelDrawingContext;
 typedef unsigned char uchar;
 #endif
 
+namespace TrackArt {
+   void DrawTracks(TrackPanelDrawingContext &context,
+                   const TrackList *tracks,
+                   const wxRegion & reg,
+                   const wxRect &clip);
+
+   void DrawTrack(TrackPanelDrawingContext &context,
+                  const Track *t,
+                  const wxRect & rect);
+
+   void DrawVRuler(TrackPanelDrawingContext &context,
+                   const Track *t, const wxRect & rect, bool bSelected );
+
+   // Helper: draws the "sync-locked" watermark tiled to a rectangle
+   void DrawSyncLockTiles(
+      TrackPanelDrawingContext &context, const wxRect &rect );
+
+   // Helper: draws background with selection rect
+   void DrawBackgroundWithSelection(TrackPanelDrawingContext &contex,
+         const wxRect &rect, const Track *track,
+         const wxBrush &selBrush, const wxBrush &unselBrush,
+         bool useSelection = true);
+
+   //
+   // Lower-level drawing functions
+   //
+
+   void DrawWaveform(TrackPanelDrawingContext &context,
+                     const WaveTrack *track,
+                     const wxRect & rect,
+                     bool muted);
+
+   void DrawSpectrum(TrackPanelDrawingContext &context,
+                     const WaveTrack *track,
+                     const wxRect & rect);
+#ifdef USE_MIDI
+   int GetBottom(NoteTrack *t, const wxRect &rect);
+   void DrawNoteBackground(TrackPanelDrawingContext &context,
+                           const NoteTrack *track,
+                           const wxRect &rect, const wxRect &sel,
+                           const wxBrush &wb, const wxPen &wp,
+                           const wxBrush &bb, const wxPen &bp,
+                           const wxPen &mp);
+   void DrawNoteTrack(TrackPanelDrawingContext &context,
+                      const NoteTrack *track,
+                      const wxRect & rect,
+                      bool muted);
+#endif // USE_MIDI
+
+   void DrawTimeTrack(TrackPanelDrawingContext &context,
+                      const TimeTrack *track,
+                      const wxRect & rect);
+
+   void DrawTimeSlider(TrackPanelDrawingContext &context,
+                       const wxRect & rect,
+                       bool rightwards, bool highlight);
+
+   void DrawClipWaveform(TrackPanelDrawingContext &context,
+                         const WaveTrack *track, const WaveClip *clip,
+                         const wxRect & rect,
+                         bool dB, bool muted);
+
+   void DrawClipSpectrum(TrackPanelDrawingContext &context,
+                         WaveTrackCache &cache, const WaveClip *clip,
+                         const wxRect & rect);
+
+   // Waveform utility functions
+
+   void DrawWaveformBackground(TrackPanelDrawingContext &context,
+                               int leftOffset, const wxRect &rect,
+                               const double env[],
+                               float zoomMin, float zoomMax,
+                               int zeroLevelYCoordinate,
+                               bool dB, float dBRange,
+                               double t0, double t1,
+                               bool bIsSyncLockSelected,
+                               bool highlightEnvelope);
+   void DrawMinMaxRMS(TrackPanelDrawingContext &context,
+                      const wxRect & rect, const double env[],
+                      float zoomMin, float zoomMax,
+                      bool dB, float dBRange,
+                      const float *min, const float *max, const float *rms, const int *bl,
+                      bool /* showProgress */, bool muted);
+   void DrawIndividualSamples(TrackPanelDrawingContext &context,
+                              int leftOffset, const wxRect & rect,
+                              float zoomMin, float zoomMax,
+                              bool dB, float dBRange,
+                              const WaveClip *clip,
+                              bool showPoints, bool muted,
+                              bool highlight);
+
+   void DrawNegativeOffsetTrackArrows( TrackPanelDrawingContext &context,
+                                       const wxRect & rect );
+
+   void DrawEnvelope(TrackPanelDrawingContext &context,
+                     const wxRect & rect, const double env[],
+                     float zoomMin, float zoomMax,
+                     bool dB, float dBRange, bool highlight);
+   void DrawEnvLine(TrackPanelDrawingContext &context,
+                    const wxRect & rect, int x0, int y0, int cy, bool top);
+}
+
 class AUDACITY_DLL_API TrackArtist {
 
 public:
    TrackArtist();
    ~TrackArtist();
-
+   static TrackArtist *Get( TrackPanelDrawingContext & );
-   void SetColours(int iColorIndex);
-   void DrawTracks(TrackPanelDrawingContext &context,
-                   const TrackList *tracks,
-                   const wxRegion & reg,
-                   const wxRect &clip, int leftOffset,
-                   const SelectedRegion &selectedRegion, const ZoomInfo &zoomInfo,
-                   bool drawEnvelope, bool bigPoints, bool drawSliders);
-
-   void DrawTrack(TrackPanelDrawingContext &context,
-                  const Track *t,
-                  const wxRect & rect,
-                  const SelectedRegion &selectedRegion, const ZoomInfo &zoomInfo,
-                  bool drawEnvelope, bool bigPoints, bool drawSliders,
-                  bool hasSolo);
-
-   void DrawVRuler(TrackPanelDrawingContext &context,
-                   const Track *t, const wxRect & rect, bool bSelected );
-
-   void UpdateVRuler(const Track *t, const wxRect & rect);
-
-   void UpdatePrefs();
 
    void SetBackgroundBrushes(wxBrush unselectedBrushIn, wxBrush selectedBrushIn,
                              wxPen unselectedPenIn, wxPen selectedPenIn) {
@@ -83,96 +163,11 @@ class AUDACITY_DLL_API TrackArtist {
      this->selectedPen = selectedPenIn;
    }
 
-   // Helper: draws the "sync-locked" watermark tiled to a rectangle
+   void SetColours(int iColorIndex);
-   static void DrawSyncLockTiles(wxDC *dc, const wxRect &rect);
 
-   // Helper: draws background with selection rect
+   void UpdatePrefs();
-   static void DrawBackgroundWithSelection(wxDC *dc, const wxRect &rect,
-         const Track *track, const wxBrush &selBrush, const wxBrush &unselBrush,
-         const SelectedRegion &selectedRegion, const ZoomInfo &zoomInfo);
 
- private:
+   void UpdateVRuler(const Track *t, const wxRect & rect);
-
-   //
-   // Lower-level drawing functions
-   //
-
-   void DrawWaveform(TrackPanelDrawingContext &context,
-                     const WaveTrack *track,
-                     const wxRect & rect,
-                     const SelectedRegion &selectedRegion, const ZoomInfo &zoomInfo,
-                     bool drawEnvelope, bool bigPoints, bool drawSliders,
-                     bool muted);
-
-   void DrawSpectrum(const WaveTrack *track,
-                     wxDC & dc, const wxRect & rect,
-                     const SelectedRegion &selectedRegion, const ZoomInfo &zoomInfo);
-#ifdef USE_MIDI
-   int GetBottom(NoteTrack *t, const wxRect &rect);
-   void DrawNoteBackground(const NoteTrack *track, wxDC &dc,
-                           const wxRect &rect, const wxRect &sel,
-                           const ZoomInfo &zoomInfo,
-                           const wxBrush &wb, const wxPen &wp,
-                           const wxBrush &bb, const wxPen &bp,
-                           const wxPen &mp);
-   void DrawNoteTrack(const NoteTrack *track,
-                      wxDC & dc, const wxRect & rect,
-                      const SelectedRegion &selectedRegion, const ZoomInfo &zoomInfo,
-                      bool muted);
-#endif // USE_MIDI
-
-   void DrawLabelTrack(TrackPanelDrawingContext &context,
-                       const LabelTrack *track,
-                       const wxRect & rect,
-                       const SelectedRegion &selectedRegion, const ZoomInfo &zoomInfo);
-
-   void DrawTimeTrack(TrackPanelDrawingContext &context,
-                      const TimeTrack *track,
-                      const wxRect & rect, const ZoomInfo &zoomInfo);
-
-   void DrawTimeSlider(wxDC & dc, const wxRect & rect,
-                       bool rightwards, bool highlight);
-
-   void DrawClipWaveform(TrackPanelDrawingContext &context,
-                         const WaveTrack *track, const WaveClip *clip,
-                         const wxRect & rect,
-                         const SelectedRegion &selectedRegion, const ZoomInfo &zoomInfo,
-                         bool drawEnvelope, bool bigPoints,
-                         bool dB, bool muted);
-
-   void DrawClipSpectrum(WaveTrackCache &cache, const WaveClip *clip,
-                         wxDC & dc, const wxRect & rect,
-                         const SelectedRegion &selectedRegion, const ZoomInfo &zoomInfo);
-
-   // Waveform utility functions
-
-   void DrawWaveformBackground(wxDC & dc, int leftOffset, const wxRect &rect,
-                               const double env[],
-                               float zoomMin, float zoomMax,
-                               int zeroLevelYCoordinate,
-                               bool dB, float dBRange,
-                               double t0, double t1, const ZoomInfo &zoomInfo,
-                               bool drawEnvelope, bool bIsSyncLockSelected,
-                               bool highlightEnvelope);
-   void DrawMinMaxRMS(wxDC &dc, const wxRect & rect, const double env[],
-                      float zoomMin, float zoomMax,
-                      bool dB, float dBRange,
-                      const float *min, const float *max, const float *rms, const int *bl,
-                      bool /* showProgress */, bool muted);
-   void DrawIndividualSamples(wxDC & dc, int leftOffset, const wxRect & rect,
-                              float zoomMin, float zoomMax,
-                              bool dB, float dBRange,
-                              const WaveClip *clip,
-                              const ZoomInfo &zoomInfo,
-                              bool bigPoints, bool showPoints, bool muted,
-                              bool highlight);
-
-   void DrawNegativeOffsetTrackArrows(wxDC & dc, const wxRect & rect);
-
-   void DrawEnvelope(wxDC & dc, const wxRect & rect, const double env[],
-                     float zoomMin, float zoomMax,
-                     bool dB, float dBRange, bool highlight);
-   void DrawEnvLine(wxDC & dc, const wxRect & rect, int x0, int y0, int cy, bool top);
 
    // Preference values
    float mdBrange;            // "/GUI/EnvdBRange"
@@ -215,6 +210,15 @@ class AUDACITY_DLL_API TrackArtist {
    int findNotesNOld;
    bool findNotesQuantizeOld;
 #endif
+
+   SelectedRegion *pSelectedRegion{};
+   ZoomInfo *pZoomInfo{};
+
+   int leftOffset{ 0 };
+   bool drawEnvelope{ false };
+   bool bigPoints{ false };
+   bool drawSliders{ false };
+   bool hasSolo{ false };
 };
 
 extern int GetWaveYPos(float value, float min, float max,

src/TrackPanel.cpp

@@ -1048,7 +1048,11 @@ void TrackPanel::DrawTracks(wxDC * dc)
 
    const wxRect clip = GetRect();
 
-   TrackPanelDrawingContext context{ *dc, Target(), mLastMouseState };
+   mTrackArtist->pSelectedRegion = &mViewInfo->selectedRegion;
+   mTrackArtist->pZoomInfo = mViewInfo;
+   TrackPanelDrawingContext context {
+      *dc, Target(), mLastMouseState, mTrackArtist.get()
+   };
 
    // Draw margins on two or three sides.
    ClearLeftAndRightMargins(context, clip);
@@ -1064,11 +1068,19 @@ void TrackPanel::DrawTracks(wxDC * dc)
    bool bigPointsFlag  = pTtb->IsDown(drawTool) || bMultiToolDown;
    bool sliderFlag     = bMultiToolDown;
 
-   // The track artist actually draws the stuff inside each track
+   const bool hasSolo = GetTracks()->Any< PlayableTrack >()
-   mTrackArtist->DrawTracks(context, GetTracks(),
+      .any_of( []( const PlayableTrack *pt ) {
-                            region, clip, GetLeftOffset(),
+         pt = static_cast< const PlayableTrack * >(
-                            mViewInfo->selectedRegion, *mViewInfo,
+            pt->SubstitutePendingChangedTrack().get() );
-                            envelopeFlag, bigPointsFlag, sliderFlag);
+         return (pt && pt->GetSolo());
+      } );
+
+   mTrackArtist->leftOffset = GetLeftOffset();
+   mTrackArtist->drawEnvelope = envelopeFlag;
+   mTrackArtist->bigPoints = bigPointsFlag;
+   mTrackArtist->drawSliders = sliderFlag;
+   mTrackArtist->hasSolo = hasSolo;
+   TrackArt::DrawTracks( context, GetTracks(), region, clip );
 
    // Draw the rest, including the click-to-deselect blank area below all
    // tracks
@@ -1142,7 +1154,7 @@ void TrackPanel::DrawEverythingElse(TrackPanelDrawingContext &context,
                GetVRulerWidth() + 1,
                trackRect.height - kSeparatorThickness
             };
-            mTrackArtist->DrawVRuler(context, channel, rect, bSelected);
+            TrackArt::DrawVRuler(context, channel, rect, bSelected);
          }
       }
    }
@@ -1638,7 +1650,7 @@ void TrackPanel::DrawOutside
       //   wxRect tileFill = rect;
       //   tileFill.x = GetVRulerOffset();
       //   tileFill.width = GetVRulerWidth();
-      //   TrackArtist::DrawSyncLockTiles(dc, tileFill);
+      //   TrackArt::DrawSyncLockTiles(dc, tileFill);
       //}
 
       DrawBordersAroundTrack( dc, rect );

src/TrackPanelDrawingContext.h

@@ -24,6 +24,8 @@ struct TrackPanelDrawingContext {
    UIHandlePtr target;
    wxMouseState lastState;
 
+   void *pUserData;
+
    // This redundancy fixes an MSVC compiler warning:
    TrackPanelDrawingContext() = delete;
 };

src/effects/Equalization.cpp

@@ -90,6 +90,7 @@
 #include "../FFT.h"
 #include "../Prefs.h"
 #include "../Project.h"
+#include "../TrackArtist.h"
 #include "../WaveTrack.h"
 #include "../widgets/Ruler.h"
 #include "../xml/XMLFileReader.h"
@@ -3049,9 +3050,12 @@ void EqualizationPanel::OnPaint(wxPaintEvent &  WXUNUSED(event))
    memDC.SetPen(*wxBLACK_PEN);
    if( mEffect->mDraw->GetValue() )
    {
-      TrackPanelDrawingContext context{ memDC, {}, {} };
+      ZoomInfo zoomInfo( 0.0, mEnvRect.width-1 );
+      TrackArtist artist;
+      artist.pZoomInfo = &zoomInfo;
+      TrackPanelDrawingContext context{ memDC, {}, {}, &artist  };
       mEffect->mEnvelope->DrawPoints(
-         context, mEnvRect, ZoomInfo(0.0, mEnvRect.width-1), false, 0.0,
+         context, mEnvRect, false, 0.0,
       mEffect->mdBMin, mEffect->mdBMax, false);
    }