Account for DPI scale factors when calculating some sizes (#2118).

2 files changed, 12 insertions, 5 deletions

diff --git a/src/wx/film_viewer.cc b/src/wx/film_viewer.cc
index 2c90b8609..a93b4226e 100644
--- a/src/wx/film_viewer.cc
+++ b/src/wx/film_viewer.cc
@@ -283,17 +283,21 @@ FilmViewer::calculate_sizes ()
 
 	auto const container = _film->container ();
 
-	auto const view_ratio = float(_video_view->get()->GetSize().x) / _video_view->get()->GetSize().y;
+	auto const dpi_scale_factor = _video_view->get()->GetDPIScaleFactor();
+	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 view_ratio = float(video_view_width) / video_view_height;
 	auto const film_ratio = container ? container->ratio () : 1.78;
 
 	dcp::Size out_size;
 	if (view_ratio < film_ratio) {
 		/* panel is less widscreen than the film; clamp width */
-		out_size.width = _video_view->get()->GetSize().x;
+		out_size.width = video_view_width;
 		out_size.height = lrintf (out_size.width / film_ratio);
 	} else {
 		/* panel is more widescreen than the film; clamp height */
-		out_size.height = _video_view->get()->GetSize().y;
+		out_size.height = video_view_height;
 		out_size.width = lrintf (out_size.height * film_ratio);
 	}
 
diff --git a/src/wx/gl_video_view.cc b/src/wx/gl_video_view.cc
index ba6d1194c..a3e69a39b 100644
--- a/src/wx/gl_video_view.cc
+++ b/src/wx/gl_video_view.cc
@@ -103,12 +103,15 @@ GLVideoView::GLVideoView (FilmViewer* viewer, wxWindow *parent)
 void
 GLVideoView::size_changed (wxSizeEvent const& ev)
 {
-	_canvas_size = ev.GetSize ();
+	auto const scale = _canvas->GetDPIScaleFactor();
+	int const width = std::round(ev.GetSize().GetWidth() * scale);
+	int const height = std::round(ev.GetSize().GetHeight() * scale);
+	_canvas_size = { width, height };
+	LOG_GENERAL("GLVideoView canvas size changed to %1x%2", width, height);
 	Sized ();
 }
 
 
-
 GLVideoView::~GLVideoView ()
 {
 	boost::this_thread::disable_interruption dis;