viewer: add shortcut to save frame as image

app/core.cpp

@@ -394,10 +394,7 @@ void Core::DialogExportShow()
   rational time;
 
   if (GetSequenceToExport(&viewer, &time)) {
-    ExportDialog* ed = new ExportDialog(viewer, main_window_);
-    ed->SetTime(time);
-    connect(ed, &ExportDialog::finished, ed, &ExportDialog::deleteLater);
-    ed->open();
+    OpenExportDialogForViewer(viewer, time, false);
   }
 }
 
@@ -1253,6 +1250,14 @@ void Core::OpenNodeInViewer(ViewerOutput *viewer)
   main_window_->OpenNodeInViewer(viewer);
 }
 
+void Core::OpenExportDialogForViewer(ViewerOutput *viewer, const rational &time, bool start_still_image)
+{
+  ExportDialog* ed = new ExportDialog(viewer, start_still_image, main_window_);
+  ed->SetTime(time);
+  connect(ed, &ExportDialog::finished, ed, &ExportDialog::deleteLater);
+  ed->open();
+}
+
 void Core::CheckForAutoRecoveries()
 {
   QFile autorecovery_index(GetAutoRecoveryIndexFilename());

app/core.h

@@ -313,6 +313,8 @@ public:
 
   void OpenNodeInViewer(ViewerOutput* viewer);
 
+  void OpenExportDialogForViewer(ViewerOutput *viewer, const rational &time, bool start_still_image);
+
 public slots:
   /**
    * @brief Starts an open file dialog to load a project from file

app/dialog/export/export.cpp

@@ -44,9 +44,10 @@ namespace olive {
 
 #define super QDialog
 
-ExportDialog::ExportDialog(ViewerOutput *viewer_node, QWidget *parent) :
+ExportDialog::ExportDialog(ViewerOutput *viewer_node, bool stills_only_mode, QWidget *parent) :
   super(parent),
-  viewer_node_(viewer_node)
+  viewer_node_(viewer_node),
+  stills_only_mode_(stills_only_mode)
 {
   QHBoxLayout* layout = new QHBoxLayout(this);
 
@@ -238,7 +239,7 @@ ExportDialog::ExportDialog(ViewerOutput *viewer_node, QWidget *parent) :
   subtitles_enabled_->setEnabled(has_subtitle_tracks);
 
   // If the viewer already has cached params, use them
-  if (viewer_node_->GetLastUsedEncodingParams().IsValid()) {
+  if (!stills_only_mode_ && viewer_node_->GetLastUsedEncodingParams().IsValid()) {
     SetParams(viewer_node_->GetLastUsedEncodingParams());
   } else {
     SetDefaults();
@@ -572,7 +573,11 @@ bool ExportDialog::SequenceHasSubtitles() const
 
 void ExportDialog::SetDefaults()
 {
+  if (!stills_only_mode_) {
     format_combobox_->SetFormat(ExportFormat::kFormatMPEG4Video);
+  } else {
+    format_combobox_->SetFormat(ExportFormat::kFormatPNG);
+  }
   FormatChanged(format_combobox_->GetFormat());
 
   VideoParams vp = viewer_node_->GetVideoParams();
@@ -745,7 +750,9 @@ void ExportDialog::done(int r)
 {
   preview_viewer_->ConnectViewerNode(nullptr);
 
+  if (!stills_only_mode_) {
     viewer_node_->SetLastUsedEncodingParams(GenerateParams());
+  }
 
   super::done(r);
 }

app/dialog/export/export.h

@@ -43,7 +43,10 @@ class ExportDialog : public QDialog
 {
   Q_OBJECT
 public:
-  ExportDialog(ViewerOutput* viewer_node, QWidget* parent = nullptr);
+  ExportDialog(ViewerOutput* viewer_node, bool stills_only_mode, QWidget* parent = nullptr);
+  ExportDialog(ViewerOutput* viewer_node, QWidget* parent = nullptr) :
+    ExportDialog(viewer_node, false, parent)
+  {}
 
   rational GetSelectedTimebase() const;
   void SetSelectedTimebase(const rational &r);
@@ -116,6 +119,8 @@ private:
   QWidget* preferences_area_;
   QCheckBox *export_bkg_box_;
 
+  bool stills_only_mode_;
+
 private slots:
   void BrowseFilename();
 

app/widget/viewer/viewer.cpp

@@ -588,6 +588,11 @@ void ViewerWidget::RequestNextDryRun()
   }
 }
 
+void ViewerWidget::SaveFrameAsImage()
+{
+  Core::instance()->OpenExportDialogForViewer(GetConnectedNode(), GetTime(), true);
+}
+
 void ViewerWidget::CloseAudioProcessor()
 {
   audio_processor_.Close();
@@ -1385,6 +1390,11 @@ void ViewerWidget::ShowContextMenu(const QPoint &pos)
     });
   }
 
+  menu.addSeparator();
+
+  auto save_frame_as_image = menu.addAction(tr("Save Frame As Image"));
+  connect(save_frame_as_image, &QAction::triggered, this, &ViewerWidget::SaveFrameAsImage);
+
   menu.exec(static_cast<QWidget*>(sender())->mapToGlobal(pos));
 }
 

app/widget/viewer/viewer.h

@@ -368,6 +368,8 @@ private slots:
 
   void RequestNextDryRun();
 
+  void SaveFrameAsImage();
+
 };
 
 }