add export depth menu

src/app_dialogs.cpp

@@ -460,6 +460,29 @@ void App::dialog_export_layers()
     }
 }
 
+void App::dialog_export_depth()
+{
+    if (!check_license())
+    {
+        message_box("License", "This function is disabled in demo mode.");
+        return;
+    }
+
+    if (canvas)
+    {
+        // TODO: use picker
+        canvas->m_canvas->export_layers(doc_name, [this] {
+#if defined(__IOS__)
+            message_box("Export 3D View + Depth", "Image and depth exported to Files/PanoPainter");
+#elif defined(__OSX__)
+            message_box("Export 3D View + Depth", "Image and depth exported to Pictures/PanoPainter folder");
+#elif defined(_WIN32)
+            message_box("Export 3D View + Depth", "Image and depth exported to " + work_path);
+#endif
+        });
+    }
+}
+
 void App::dialog_resize()
 {
     auto dialog = std::make_shared<NodeDialogResize>();