diff -r b273b43b16d2 -r 8354b390f1a2 qmlfrontend/engine_instance.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/qmlfrontend/engine_instance.h	Wed Nov 07 15:59:51 2018 +0100
@@ -0,0 +1,24 @@
+#ifndef ENGINEINSTANCE_H
+#define ENGINEINSTANCE_H
+
+#include "engine_interface.h"
+
+#include <QObject>
+
+class EngineInstance : public QObject {
+  Q_OBJECT
+ public:
+  explicit EngineInstance(QObject *parent = nullptr);
+  ~EngineInstance();
+
+  Engine::PreviewInfo generatePreview();
+
+ signals:
+
+ public slots:
+
+ private:
+  Engine::EngineInstance *m_instance;
+};
+
+#endif  // ENGINEINSTANCE_H