reduce waveform scale

Exponentially improves performance (at the expense of higher zoom levels but they were probably already too extreme)

app/widget/timebased/timebasedview.cpp

@@ -29,8 +29,6 @@
 
 namespace olive {
 
-const double TimeBasedView::kMaximumScale = 8192;
-
 TimeBasedView::TimeBasedView(QWidget *parent) :
   HandMovableView(parent),
   playhead_scene_left_(-1),
@@ -53,9 +51,6 @@ TimeBasedView::TimeBasedView(QWidget *parent) :
   // Signal to update bounding rect when the scene changes
   connect(&scene_, &QGraphicsScene::changed, this, &TimeBasedView::UpdateSceneRect);
 
-  // Always enforce maximum scale
-  SetMaximumScale(kMaximumScale);
-
   // Workaround for Qt drawing issues with the default MinimalViewportUpdate. While this might be
   // slower (Qt documentation says it may actually be faster in some situations),
   // MinimalViewportUpdate causes all sorts of graphical crud building up in the scene

app/widget/timebased/timebasedview.h

@@ -36,8 +36,6 @@ class TimeBasedView : public HandMovableView, public TimeScaledObject
 public:
   TimeBasedView(QWidget* parent = nullptr);
 
-  static const double kMaximumScale;
-
   void EnableSnap(const QVector<rational> &points);
   void DisableSnap();
   bool IsSnapped() const

app/widget/timebased/timescaledobject.cpp

@@ -27,14 +27,16 @@
 
 namespace olive {
 
+// Keep this aligned with the kMaximumSampleRate in AudioVisualWaveform
+const double TimeScaledObject::kMaximumScale = 1024;
+
 const int TimeScaledObject::kCalculateDimensionsPadding = 10;
 
 TimeScaledObject::TimeScaledObject() :
   scale_(1.0),
   min_scale_(0),
-  max_scale_(DBL_MAX)
+  max_scale_(kMaximumScale)
 {
-
 }
 
 void TimeScaledObject::SetTimebase(const rational &timebase)

app/widget/timebased/timescaledobject.h

@@ -54,6 +54,8 @@ public:
   double TimeToScene(const rational& time) const;
   rational SceneToTime(const double &x, bool round = false) const;
 
+  static const double kMaximumScale;
+
 protected:
   virtual void TimebaseChangedEvent(const rational&){}