3 files changed, 19 insertions, 7 deletions
diff --git a/src/wx/film_viewer.cc b/src/wx/film_viewer.cc
index 392c68d70..259e2bc16 100644
--- a/src/wx/film_viewer.cc
+++ b/src/wx/film_viewer.cc
@@ -283,13 +283,9 @@ FilmViewer::calculate_sizes ()
 
 	auto const container = _film->container ();
 
-#if wxCHECK_VERSION(3,1,0)
-	auto const dpi_scale_factor = _video_view->get()->GetDPIScaleFactor();
-#else
-	auto const dpi_scale_factor = 1;
-#endif
-	int const video_view_width = std::round(_video_view->get()->GetSize().x * dpi_scale_factor);
-	int const video_view_height = std::round(_video_view->get()->GetSize().y * dpi_scale_factor);
+	auto const scale = dpi_scale_factor (_video_view->get());
+	int const video_view_width = std::round(_video_view->get()->GetSize().x * scale);
+	int const video_view_height = std::round(_video_view->get()->GetSize().y * scale);
 
 	auto const view_ratio = float(video_view_width) / video_view_height;
 	auto const film_ratio = container ? container->ratio () : 1.78;
diff --git a/src/wx/wx_util.cc b/src/wx/wx_util.cc
index a0beb8f72..47a6bd5b0 100644
--- a/src/wx/wx_util.cc
+++ b/src/wx/wx_util.cc
@@ -673,3 +673,18 @@ gui_is_dark ()
 #endif
 }
 
+
+#if wxCHECK_VERSION(3,1,0)
+double
+dpi_scale_factor (wxWindow* window)
+{
+	return window->GetDPIScaleFactor();
+}
+#else
+double
+dpi_scale_factor (wxWindow*)
+{
+	return 1;
+}
+#endif
+
diff --git a/src/wx/wx_util.h b/src/wx/wx_util.h
index 585a30611..30e2b739a 100644
--- a/src/wx/wx_util.h
+++ b/src/wx/wx_util.h
@@ -120,6 +120,7 @@ extern bool report_errors_from_last_job (wxWindow* parent);
 extern wxString bitmap_path (std::string name);
 extern wxSize small_button_size (wxWindow* parent, wxString text);
 extern bool gui_is_dark ();
+extern double dpi_scale_factor (wxWindow* window);
 
 
 struct Offset