diff --git a/tools/viewer/Viewer.h b/tools/viewer/Viewer.h
index 9499c6c..74d3f06 100644
--- a/tools/viewer/Viewer.h
+++ b/tools/viewer/Viewer.h
@@ -60,10 +60,13 @@
     bool                   fDisplayStats;
     bool                   fRefresh; // whether to continuously refresh for measuring render time
 
-    sk_sp<SkImage>         fImGuiFontImage;
+    SkPaint                fImGuiFontPaint;
     bool                   fShowImGuiDebugWindow;
     bool                   fShowImGuiTestWindow;
 
+    bool                   fShowZoomWindow;
+    sk_sp<SkImage>         fLastImage;
+
     sk_app::Window::BackendType fBackendType;
 
     // Color properties for slide rendering