implemented base for thumbnail display

app/widget/timelinewidget/timelinewidget.cpp

@@ -1093,6 +1093,11 @@ void TimelineWidget::ShowContextMenu()
     toggle_audio_units->setChecked(use_audio_time_units_);
     connect(toggle_audio_units, &QAction::triggered, this, &TimelineWidget::SetUseAudioTimeUnits);
 
+    QAction* show_thumbnails = menu.addAction(tr("Show Thumbnails"));
+    show_thumbnails->setCheckable(true);
+    show_thumbnails->setChecked(views_.first()->view()->GetShowThumbnails());
+    connect(show_thumbnails, &QAction::triggered, this, &TimelineWidget::SetViewThumbnailsEnabled);
+
     QAction* show_waveforms = menu.addAction(tr("Show Waveforms"));
     show_waveforms->setCheckable(true);
     show_waveforms->setChecked(views_.first()->view()->GetShowWaveforms());
@@ -1167,6 +1172,13 @@ void TimelineWidget::SetViewWaveformsEnabled(bool e)
   }
 }
 
+void TimelineWidget::SetViewThumbnailsEnabled(bool e)
+{
+  foreach (TimelineAndTrackView* tview, views_) {
+    tview->view()->SetShowThumbnails(e);
+  }
+}
+
 void TimelineWidget::FrameRateChanged()
 {
   SetTimebase(GetConnectedNode()->GetVideoParams().frame_rate_as_time_base());

app/widget/timelinewidget/timelinewidget.h

@@ -415,6 +415,8 @@ private slots:
 
   void SetViewWaveformsEnabled(bool e);
 
+  void SetViewThumbnailsEnabled(bool e);
+
   void FrameRateChanged();
 
   void SampleRateChanged();

app/widget/timelinewidget/view/timelineview.cpp

@@ -524,18 +524,27 @@ void TimelineView::DrawBlock(QPainter *painter, bool foreground, Block *block, q
 
         // Draw clip thumbnails
         if (clip->GetTrackType() == Track::kVideo && show_thumbnails_ && preview_rect.height() > r.height()/3) {
-          const int kTempThumbWidth = 120;
-          const int kTempThumbHeight = 68;
+          if (const FrameHashCache *thumbs = clip->thumbnails()) {
+            QRect thumb_rect;
+            painter->setClipRect(preview_rect);
+            painter->setRenderHint(QPainter::SmoothPixmapTransform);
+            for (int i=preview_rect.left(); i<preview_rect.right(); i+=thumb_rect.width()+1) {
+              rational time_here = SceneToTime(i - block_in, GetScale(), connected_track_list_->parent()->GetAudioParams().sample_rate_as_time_base()) + media_in;
+              QString thumbnail = thumbs->GetValidCacheFilename(time_here);
 
-          QRect thumb_rect;
-          painter->setClipRect(preview_rect);
-          for (int i=preview_rect.left(); i<preview_rect.right(); i+=thumb_rect.width()+1) {
-            double scale = double(preview_rect.height())/double(kTempThumbHeight);
-            thumb_rect = QRect(i, preview_rect.top(), kTempThumbWidth * scale, preview_rect.height());
-
-            painter->fillRect(thumb_rect, Qt::red);
+              if (thumbnail.isEmpty()) {
+                break;
+              } else {
+                QImage img;
+                if (img.load(thumbnail, "jpg")) {
+                  double scale = double(preview_rect.height())/double(img.height());
+                  thumb_rect = QRect(i, preview_rect.top(), img.width() * scale, preview_rect.height());
+                  painter->drawImage(thumb_rect, img);
+                }
+              }
+            }
+            painter->setClipping(false);
           }
-          painter->setClipping(false);
         }
 
         // Draw waveform

app/widget/timelinewidget/view/timelineview.h

@@ -84,6 +84,17 @@ public:
     viewport()->update();
   }
 
+  bool GetShowThumbnails() const
+  {
+    return show_thumbnails_;
+  }
+
+  void SetShowThumbnails(bool e)
+  {
+    show_thumbnails_ = e;
+    viewport()->update();
+  }
+
 signals:
   void MousePressed(TimelineViewMouseEvent* event);
   void MouseMoved(TimelineViewMouseEvent* event);

app/widget/viewer/viewer.cpp

@@ -148,6 +148,7 @@ ViewerWidget::ViewerWidget(QWidget *parent) :
   setAcceptDrops(true);
 
   auto_cacher_ = new PreviewAutoCacher(this);
+  connect(display_widget_, &ViewerDisplayWidget::ColorProcessorChanged, auto_cacher_, &PreviewAutoCacher::SetDisplayColorProcessor);
 
   connect(Core::instance(), &Core::ColorPickerEnabled, this, &ViewerWidget::SetSignalCursorColorEnabled);
   connect(this, &ViewerWidget::CursorColor, Core::instance(), &Core::ColorPickerColorEmitted);
@@ -686,11 +687,6 @@ void ViewerWidget::UpdateTextureFromNode()
     connect(watcher, &RenderTicketWatcher::Finished, this, &ViewerWidget::RendererGeneratedFrame);
     nonqueue_watchers_.append(watcher);
 
-    // Clear queue because we want this frame more than any others
-    if (!GetConnectedNode()->video_frame_cache()->IsAutomatic() && !auto_cacher_->IsRenderingCustomRange()) {
-      ClearVideoAutoCacherQueue();
-    }
-
     watcher->SetTicket(GetFrame(time, RenderTicketPriority::kHigh));
   } else {
     // There is definitely no frame here, we can immediately flip to showing nothing
@@ -718,8 +714,8 @@ void ViewerWidget::PlayInternal(int speed, bool in_to_out_only)
   foreach (ViewerWidget* viewer, instances_) {
     if (viewer != this) {
       viewer->PauseInternal();
-      viewer->auto_cacher_->SetRendersPaused(true);
     }
+    viewer->auto_cacher_->SetRendersPaused(true);
   }
 
   // Disarm recording if armed