WaveTrackLocation.cpp

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/**********************************************************************
 
Audacity: A Digital Audio Editor
 
@file WaveTrackLocation.cpp
@brief implements WaveTrackLocations
 
Paul Licameli -- split from WaveTrack.h
 
**********************************************************************/
#include "WaveTrackLocation.h"
#include "WaveTrack.h"
#include "WaveClip.h"
 
#include <cmath>
 
WaveTrackLocations FindWaveTrackLocations(const WaveTrack &track)
{
   WaveTrackLocations locations;
 
   auto clips = track.SortedIntervalArray();
 
   // Count number of display locations
   int num = 0;
   for (const auto clip : clips)
      num += clip->NumCutLines();
 
   if (num == 0)
      return locations;
 
   // Alloc necessary number of display locations
   locations.reserve(num);
 
   // Add all display locations to cache
   int curpos = 0;
 
   for (const auto clip: clips) {
      for (const auto &cc : clip->GetCutLines()) {
         auto cutlinePosition =
            clip->GetSequenceStartTime() + cc->GetSequenceStartTime();
         if (clip->WithinPlayRegion(cutlinePosition)) {
             // Add cut line expander point
             locations.emplace_back(cutlinePosition);
         }
         // If cutline is skipped, we still need to count it
         // so that curpos matches num at the end
         curpos++;
      }
   }
 
   assert(curpos == num);
 
   return locations;
}