From 62d380a1d9c8ba23ce3a05a09375fdc75a1cfc32 Mon Sep 17 00:00:00 2001
From: Abs62 <ottomann@yandex.ru>
Date: Tue, 17 Jun 2014 17:47:04 +0400
Subject: [PATCH] Mac-specific: Fix for retina display

---
 lionsupport.h  |  3 +++
 lionsupport.mm | 11 +++++++++++
 main.cc        | 11 ++++++++++-
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/lionsupport.h b/lionsupport.h
index 02d3f0e2..2fd1d897 100644
--- a/lionsupport.h
+++ b/lionsupport.h
@@ -15,6 +15,9 @@ public:
      * Adds fullscreen button to window for Lion.
      */
     static void addFullscreen(MainWindow *window);
+
+    //Check for retina display
+    static bool isRetinaDisplay();
 };
 
 #endif // LIONSUPPORT_H
diff --git a/lionsupport.mm b/lionsupport.mm
index df16ea1a..1917b8f9 100644
--- a/lionsupport.mm
+++ b/lionsupport.mm
@@ -1,4 +1,5 @@
 #include <AppKit/NSWindow.h>
+#include <AppKit/NSScreen.h>
 #include "lionsupport.h"
 
 bool LionSupport::isLion()
@@ -21,3 +22,13 @@ void LionSupport::addFullscreen(MainWindow *window)
 #warning No fullscreen support will be included in this build
 #endif
 }
+
+bool LionSupport::isRetinaDisplay()
+{
+#if defined(MAC_OS_X_VERSION_10_7) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
+  return( [ [ NSScreen mainScreen ] respondsToSelector:@selector( backingScaleFactor ) ]
+          && [ [ NSScreen mainScreen ] backingScaleFactor ] > 1.5 );
+#else
+  return false;
+#endif
+}
diff --git a/main.cc b/main.cc
index 68f17eb2..ed7cfbac 100644
--- a/main.cc
+++ b/main.cc
@@ -33,6 +33,10 @@
 
 #include "gddebug.hh"
 
+#ifdef Q_OS_MAC
+#include "lionsupport.h"
+#endif
+
 void gdMessageHandler( QtMsgType type, const char *msg )
 {
   QString message = QString::fromUtf8( msg );
@@ -83,7 +87,12 @@ int main( int argc, char ** argv )
 {
   #ifdef Q_OS_MAC
     setenv("LANG", "en_US.UTF-8", 1);
-    setenv("QT_GRAPHICSSYSTEM", "raster", 1);
+
+   // Check for retina display
+   if( LionSupport::isRetinaDisplay() )
+     QApplication::setGraphicsSystem( "native" );
+   else
+     QApplication::setGraphicsSystem( "raster" );
   #endif
 
   // The following clause fixes a race in the MinGW runtime where throwing