Use std::vector for wave track locations

src/TrackArtist.cpp

@@ -1480,8 +1480,7 @@ void TrackArtist::DrawWaveform(WaveTrack *track,
    // Update cache for locations, e.g. cutlines and merge points
    track->UpdateLocationsCache();
 
-   for (int i = 0; i<track->GetNumCachedLocations(); i++) {
-      WaveTrack::Location loc = track->GetCachedLocation(i);
+   for (const auto loc : track->GetCachedLocations()) {
       const int xx = zoomInfo.TimeToPosition(loc.pos);
       if (xx >= 0 && xx < rect.width) {
          dc.SetPen(*wxGREY_PEN);

src/TrackPanel.cpp

@@ -6655,11 +6655,12 @@ namespace {
    int FindMergeLine(WaveTrack *track, double time)
    {
       const double tolerance = 0.5 / track->GetRate();
-      for (int ii = 0, nn = track->GetNumCachedLocations(); ii < nn; ++ii) {
-         WaveTrack::Location loc = track->GetCachedLocation(ii);
+      int ii = 0;
+      for (const auto loc: track->GetCachedLocations()) {
          if (loc.typ == WaveTrackLocation::locationMergePoint &&
             fabs(time - loc.pos) < tolerance)
             return ii;
+         ++ii;
       }
       return -1;
    }
@@ -6731,7 +6732,7 @@ bool TrackPanel::HandleTrackLocationMouseEvent(WaveTrack * track, wxRect &rect,
                // Don't assume correspondence of merge points across channels!
                int idx = FindMergeLine(linked, pos);
                if (idx >= 0) {
-                  WaveTrack::Location location = linked->GetCachedLocation(idx);
+                  WaveTrack::Location location = linked->GetCachedLocations()[idx];
                   if (!linked->MergeClips(location.clipidx1, location.clipidx2))
                      return false;
                }
@@ -6770,10 +6771,8 @@ bool TrackPanel::HandleTrackLocationMouseEvent(WaveTrack * track, wxRect &rect,
 
 bool TrackPanel::IsOverCutline(WaveTrack * track, wxRect &rect, wxMouseEvent &event)
 {
-   for (int i=0; i<track->GetNumCachedLocations(); i++)
+   for (auto loc: track->GetCachedLocations())
    {
-      WaveTrack::Location loc = track->GetCachedLocation(i);
-
       const double x = mViewInfo->TimeToPosition(loc.pos);
       if (x >= 0 && x < rect.width)
       {

src/WaveTrack.cpp

@@ -108,9 +108,6 @@ WaveTrack::WaveTrack(DirManager *projDirManager, sampleFormat format, double rat
    mDisplayMin = -1.0;
    mDisplayMax = 1.0;
    mSpectrumMin = mSpectrumMax = -1; // so values will default to settings
-   mDisplayNumLocations = 0;
-   mDisplayLocations = NULL;
-   mDisplayNumLocationsAllocated = 0;
    mLastScaleType = -1;
    mLastdBRange = -1;
    mAutoSaveIdent = 0;
@@ -150,9 +147,7 @@ void WaveTrack::Init(const WaveTrack &orig)
    mDisplayMax = orig.mDisplayMax;
    mSpectrumMin = orig.mSpectrumMin;
    mSpectrumMax = orig.mSpectrumMax;
-   mDisplayNumLocations = 0;
-   mDisplayLocations = NULL;
-   mDisplayNumLocationsAllocated = 0;
+   mDisplayLocationsCache.clear();
 }
 
 void WaveTrack::Merge(const Track &orig)
@@ -181,8 +176,6 @@ WaveTrack::~WaveTrack()
    for (WaveClipList::compatibility_iterator it=GetClipIterator(); it; it=it->GetNext())
       delete it->GetData();
    mClips.Clear();
-   if (mDisplayLocations)
-      delete [] mDisplayLocations;
 
    delete mpSpectrumSettings;
    delete mpWaveformSettings;
@@ -2437,33 +2430,26 @@ void WaveTrack::UpdateLocationsCache()
 
    FillSortedClipArray(clips);
 
-   mDisplayNumLocations = 0;
+   mDisplayLocationsCache.clear();
 
    // Count number of display locations
+   int num = 0;
    for (i = 0; i < clips.GetCount(); i++)
    {
       WaveClip* clip = clips.Item(i);
 
-      mDisplayNumLocations += clip->GetCutLines()->GetCount();
+      num += clip->GetCutLines()->GetCount();
 
       if (i > 0 && fabs(clips.Item(i - 1)->GetEndTime() -
                   clip->GetStartTime()) < WAVETRACK_MERGE_POINT_TOLERANCE)
-         mDisplayNumLocations++;
+         ++num;
    }
 
-   if (mDisplayNumLocations == 0)
+   if (num == 0)
       return;
 
    // Alloc necessary number of display locations
-   if (mDisplayNumLocations > mDisplayNumLocationsAllocated)
-   {
-      // Only realloc, if we need more space than before. Otherwise
-      // just use block from before.
-      if (mDisplayLocations)
-         delete[] mDisplayLocations;
-      mDisplayLocations = new Location[mDisplayNumLocations];
-      mDisplayNumLocationsAllocated = mDisplayNumLocations;
-   }
+   mDisplayLocationsCache.reserve(num);
 
    // Add all display locations to cache
    int curpos = 0;
@@ -2477,9 +2463,10 @@ void WaveTrack::UpdateLocationsCache()
            it = it->GetNext())
       {
          // Add cut line expander point
-         mDisplayLocations[curpos].typ = WaveTrackLocation::locationCutLine;
-         mDisplayLocations[curpos].pos =
-            clip->GetOffset() + it->GetData()->GetOffset();
+         mDisplayLocationsCache.push_back(WaveTrackLocation{
+            clip->GetOffset() + it->GetData()->GetOffset(),
+            WaveTrackLocation::locationCutLine
+         });
          curpos++;
       }
 
@@ -2491,16 +2478,18 @@ void WaveTrack::UpdateLocationsCache()
                                           < WAVETRACK_MERGE_POINT_TOLERANCE)
          {
             // Add merge point
-            mDisplayLocations[curpos].typ = WaveTrackLocation::locationMergePoint;
-            mDisplayLocations[curpos].pos = clips.Item(i-1)->GetEndTime();
-            mDisplayLocations[curpos].clipidx1 = mClips.IndexOf(previousClip);
-            mDisplayLocations[curpos].clipidx2 = mClips.IndexOf(clip);
+            mDisplayLocationsCache.push_back(WaveTrackLocation{
+               clips.Item(i - 1)->GetEndTime(),
+               WaveTrackLocation::locationMergePoint,
+               mClips.IndexOf(previousClip),
+               mClips.IndexOf(clip)
+            });
             curpos++;
          }
       }
    }
 
-   wxASSERT(curpos == mDisplayNumLocations);
+   wxASSERT(curpos == num);
 }
 
 // Expand cut line (that is, re-insert audio, then DELETE audio saved in cut line)

src/WaveTrack.h

@@ -375,9 +375,8 @@ class AUDACITY_DLL_API WaveTrack final : public Track {
    // Cache special locations (e.g. cut lines) for later speedy access
    void UpdateLocationsCache();
 
-   // Get number of cached locations
-   int GetNumCachedLocations() { return mDisplayNumLocations; }
-   Location GetCachedLocation(int index) { return mDisplayLocations[index]; }
+   // Get cached locations
+   const std::vector<Location> &GetCachedLocations() const { return mDisplayLocationsCache; }
 
    // Expand cut line (that is, re-insert audio, then DELETE audio saved in cut line)
    bool ExpandCutLine(double cutLinePosition, double* cutlineStart = NULL, double* cutlineEnd = NULL);
@@ -477,9 +476,7 @@ class AUDACITY_DLL_API WaveTrack final : public Track {
    WaveTrackDisplay mDisplay;
    int           mLastScaleType; // last scale type choice
    int           mLastdBRange;
-   int           mDisplayNumLocations;
-   int           mDisplayNumLocationsAllocated;
-   Location*       mDisplayLocations;
+   mutable std::vector <Location> mDisplayLocationsCache;
 
    //
    // Protected methods

src/WaveTrackLocation.h

@@ -18,6 +18,13 @@ struct WaveTrackLocation {
       locationMergePoint
    };
 
+   explicit
+   WaveTrackLocation
+   (double pos_ = 0.0, LocationType typ_ = locationCutLine,
+    int clipidx1_ = -1, int clipidx2_ = -1)
+    : pos(pos_), typ(typ_), clipidx1(clipidx1_), clipidx2(clipidx2_)
+   {}
+
    // Position of track location
    double pos;