Bug2583 residual: Re-placement of cutlines when generating sound

src/effects/Effect.cpp

@@ -17,6 +17,7 @@
 
 #include "../Audacity.h"
 #include "Effect.h"
+#include "TimeWarper.h"
 
 #include "../Experimental.h"
 
@@ -1874,28 +1875,14 @@ bool Effect::ProcessTrack(int count,
    {
       auto pProject = FindProject();
 
-      // PRL:  this code was here and could not have been the right
-      // intent, mixing time and sampleCount values:
-      // StepTimeWarper warper(mT0 + genLength, genLength - (mT1 - mT0));
-
-      // This looks like what it should have been:
-      // StepTimeWarper warper(mT0 + genDur, genDur - (mT1 - mT0));
-      // But rather than fix it, I will just disable the use of it for now.
-      // The purpose was to remap split lines inside the selected region when
-      // a generator replaces it with sound of different duration.  But
-      // the "correct" version might have the effect of mapping some splits too
-      // far left, to before the selection.
-      // In practice the wrong version probably did nothing most of the time,
-      // because the cutoff time for the step time warper was 44100 times too
-      // far from mT0.
-
       // Transfer the data from the temporary tracks to the actual ones
       genLeft->Flush();
       // mT1 gives us the NEW selection. We want to replace up to GetSel1().
       auto &selectedRegion = ViewInfo::Get( *pProject ).selectedRegion;
-      left->ClearAndPaste(mT0,
-         selectedRegion.t1(), genLeft.get(), true, true,
-         nullptr /* &warper */);
+      auto t1 = selectedRegion.t1();
+      PasteTimeWarper warper{ t1, mT0 + genLeft->GetEndTime() };
+      left->ClearAndPaste(mT0, t1, genLeft.get(), true, true,
+         &warper);
 
       if (genRight)
       {

src/effects/Generator.cpp

@@ -75,8 +75,7 @@ bool Generator::Process()
             else {
                // Transfer the data from the temporary track to the actual one
                tmp->Flush();
-               StepTimeWarper warper{
-                  mT0+GetDuration(), GetDuration()-(mT1-mT0) };
+               PasteTimeWarper warper{ mT1, mT0+GetDuration() };
                const auto &selectedRegion =
                   ViewInfo::Get( *pProject ).selectedRegion;
                track->ClearAndPaste(

src/effects/TimeWarper.cpp

@@ -138,15 +138,6 @@ GeometricOutputTimeWarper::GeometricOutputTimeWarper(double tStart, double tEnd,
    wxASSERT(tStart < tEnd);
 }
 
-StepTimeWarper::StepTimeWarper(double tStep, double offset)
-: mTStep(tStep), mOffset(offset)
-{ }
-
-double StepTimeWarper::Warp(double originalTime) const
-{
-   return originalTime + ((originalTime > mTStep) ? mOffset : 0.0);
-}
-
 PasteTimeWarper::PasteTimeWarper(double oldT1, double newT1)
 : mOldT1{ oldT1 }, mNewT1{ newT1 }
 { }

src/effects/TimeWarper.h

@@ -43,9 +43,6 @@ split points in the input.
 \class GeometricOutputRateTimeWarper
 \brief TimeScale - rate varies geometrically with output
 
-\class StepTimeWarper
-\brief Unit slope but with a jump
-
 \class PasteTimeWarper
 \brief Unit slope but with either a jump (pasting more) or a flat interval (pasting less)
 
@@ -180,16 +177,6 @@ public:
    double Warp(double originalTime) const override;
 };
 
-class StepTimeWarper final : public TimeWarper
-{
-private:
-   double mTStep;
-   double mOffset;
-public:
-   StepTimeWarper(double tStep, double offset);
-   double Warp(double originalTime) const override;
-};
-
 class PasteTimeWarper final : public TimeWarper
 {
 private: