From 668f0e7c54a969df1ea643f038afbcae0cda6128 Mon Sep 17 00:00:00 2001
From: Stefan Csomor <csomor@advancedconcepts.ch>
Date: Sat, 18 Jul 2020 20:01:23 +0200
Subject: [PATCH] Implement wxWindow::GetDPI() on macOS and iOS

---
 include/wx/osx/window.h |  2 ++
 src/osx/window_osx.cpp  | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/wx/osx/window.h b/include/wx/osx/window.h
index 19cd7d21d7..af92472618 100644
--- a/include/wx/osx/window.h
+++ b/include/wx/osx/window.h
@@ -120,6 +120,8 @@ public:
     virtual bool UnregisterHotKey(int hotkeyId) wxOVERRIDE;
 #endif // wxUSE_HOTKEY
 
+    virtual wxSize GetDPI() const wxOVERRIDE;
+
 #if wxUSE_DRAG_AND_DROP
     virtual void SetDropTarget( wxDropTarget *dropTarget ) wxOVERRIDE;
 
diff --git a/src/osx/window_osx.cpp b/src/osx/window_osx.cpp
index beccd49723..6e0ab1cfe8 100644
--- a/src/osx/window_osx.cpp
+++ b/src/osx/window_osx.cpp
@@ -2599,6 +2599,19 @@ bool wxWindowMac::OSXHandleKeyEvent( wxKeyEvent& event )
     return handled ;
 }
 
+wxSize wxWindowMac::GetDPI() const
+{
+    wxNonOwnedWindow* tlw = MacGetTopLevelWindow() ;
+
+    double scaleFactor;
+    if ( tlw )
+        scaleFactor = tlw->GetContentScaleFactor();
+    else
+        scaleFactor = wxOSXGetMainScreenContentScaleFactor();
+
+    return wxSize(wxRound(scaleFactor*72.0),wxRound(scaleFactor*72.0));
+}
+
 //
 // wxWidgetImpl
 //