added second frame cache for thumbnails

app/node/block/clip/clip.cpp

@@ -187,7 +187,7 @@ void ClipBlock::InvalidateCache(const TimeRange& range, const QString& from, int
       if (Node *connected = GetConnectedOutput(from, element)) {
         TimeRange max_range = InputTimeAdjustment(from, element, TimeRange(0, length()));
         if (type == Track::kVideo) {
-          emit connected->video_frame_cache()->Request(range.Intersected(max_range), PlaybackCache::kPreviewsOnly);
+          emit connected->thumbnail_cache()->Request(range.Intersected(max_range), PlaybackCache::kPreviewsOnly);
         } else if (type == Track::kAudio) {
           emit connected->audio_playback_cache()->Request(range.Intersected(max_range), PlaybackCache::kPreviewsOnly);
         }
@@ -250,7 +250,7 @@ void ClipBlock::InputConnectedEvent(const QString &input, int element, Node *out
   super::InputConnectedEvent(input, element, output);
 
   if (input == kBufferIn) {
-    connect(output->video_frame_cache(), &FrameHashCache::ThumbnailsUpdated, this, &Block::PreviewChanged);
+    connect(output->thumbnail_cache(), &FrameHashCache::Validated, this, &Block::PreviewChanged);
     connect(output->audio_playback_cache(), &AudioPlaybackCache::WaveformUpdated, this, &Block::PreviewChanged);
   }
 }
@@ -260,7 +260,7 @@ void ClipBlock::InputDisconnectedEvent(const QString &input, int element, Node *
   super::InputDisconnectedEvent(input, element, output);
 
   if (input == kBufferIn) {
-    disconnect(output->video_frame_cache(), &FrameHashCache::ThumbnailsUpdated, this, &Block::PreviewChanged);
+    disconnect(output->thumbnail_cache(), &FrameHashCache::Validated, this, &Block::PreviewChanged);
     disconnect(output->audio_playback_cache(), &AudioPlaybackCache::WaveformUpdated, this, &Block::PreviewChanged);
   }
 }

app/node/block/clip/clip.h

@@ -122,7 +122,7 @@ public:
   const FrameHashCache *thumbnails()
   {
     if (Node *n = GetConnectedOutput(kBufferIn)) {
-      return n->video_frame_cache();
+      return n->thumbnail_cache();
     } else {
       return nullptr;
     }

app/node/node.cpp

@@ -54,6 +54,7 @@ Node::Node() :
   AddInput(kEnabledInput, NodeValue::kBoolean, true);
 
   video_cache_ = new FrameHashCache(this);
+  thumbnail_cache_ = new FrameHashCache(this);
   audio_cache_ = new AudioPlaybackCache(this);
 }
 
@@ -936,6 +937,7 @@ void Node::InvalidateCache(const TimeRange &range, const QString &from, int elem
     TimeRange vr = range.Intersected(GetVideoCacheRange());
     if (vr.length() != 0) {
       video_frame_cache()->Invalidate(vr);
+      thumbnail_cache()->Invalidate(vr);
     }
     TimeRange ar = range.Intersected(GetAudioCacheRange());
     if (ar.length() != 0) {

app/node/node.h

@@ -226,6 +226,11 @@ public:
     return video_cache_;
   }
 
+  FrameHashCache* thumbnail_cache() const
+  {
+    return thumbnail_cache_;
+  }
+
   AudioPlaybackCache* audio_playback_cache() const
   {
     return audio_cache_;
@@ -1402,6 +1407,7 @@ private:
   QString effect_input_;
 
   FrameHashCache *video_cache_;
+  FrameHashCache *thumbnail_cache_;
 
   AudioPlaybackCache *audio_cache_;