timeline: heavily optimized and improved nearly all timeline optimizations

Features a lot of timeline-related cache optimizations as well as general
optimizations and improvements in timeline behavior. Should improve
usability significantly.

app/node/block/clip/clip.cpp

@@ -62,7 +62,7 @@ NodeInput *ClipBlock::texture_input() const
 void ClipBlock::InvalidateCache(const TimeRange &range, NodeInput *from, NodeInput *source)
 {
   // If signal is from texture input, transform all times from media time to sequence time
-  if (from == texture_input_) {
+  if (from == texture_input_ || from == media_in_input()) {
     rational start = MediaToSequenceTime(range.in());
     rational end = MediaToSequenceTime(range.out());
 

app/node/block/clip/clip.h

@@ -21,6 +21,7 @@
 #ifndef CLIPBLOCK_H
 #define CLIPBLOCK_H
 
+#include "audio/audiovisualwaveform.h"
 #include "node/block/block.h"
 
 OLIVE_NAMESPACE_ENTER
@@ -56,12 +57,26 @@ public:
 
   virtual void Hash(QCryptographicHash &hash, const rational &time) const override;
 
+  AudioVisualWaveform& waveform()
+  {
+    return waveform_;
+  }
+
+  void set_waveform(const AudioVisualWaveform& wave)
+  {
+    waveform_ = wave;
+
+    emit PreviewUpdated();
+  }
+
 signals:
   void PreviewUpdated();
 
 private:
   NodeInput* texture_input_;
 
+  AudioVisualWaveform waveform_;
+
 };
 
 OLIVE_NAMESPACE_EXIT