code for detecting retina displays

src/cpp/desktop/CMakeLists.txt

@@ -149,6 +149,12 @@ else()
   endif()
 endif(WIN32)
 
+if(APPLE)
+  set(DESKTOP_SOURCE_FILES ${DESKTOP_SOURCE_FILES}
+    DesktopUtilsMac.mm
+  )
+endif()
+
 # include directories
 include_directories(
   include
@@ -210,7 +216,7 @@ if(WIN32)
 
 elseif(APPLE)
    find_library(APPLICATION_SERVICES_LIBRARY NAMES ApplicationServices)
-   set(LINK_FLAGS ${APPLICATION_SERVICES_LIBRARY})
+   find_library(COCOA_LIBRARY NAMES Cocoa)
 endif(WIN32)
 
 
@@ -275,7 +281,8 @@ else()
    target_link_libraries(RStudio
       ${QT_LIBRARIES}
       rstudio-core
-      ${LINK_FLAGS})
+      ${APPLICATION_SERVICES_LIBRARY}
+      ${COCOA_LIBRARY})
 
 endif()
 

src/cpp/desktop/DesktopGwtCallback.cpp

@@ -377,6 +377,11 @@ bool GwtCallback::canChooseRVersion()
 #endif
 }
 
+bool GwtCallback::isRetina()
+{
+   return desktop::isRetina(pMainWindow_);
+}
+
 void GwtCallback::openMinimalWindow(QString name,
                                     QString url,
                                     int width,

src/cpp/desktop/DesktopGwtCallback.hpp

@@ -73,6 +73,8 @@ public slots:
    QString chooseRVersion();
    bool canChooseRVersion();
 
+   bool isRetina();
+
    void openMinimalWindow(QString name, QString url, int width, int height);
    void activateSatelliteWindow(QString name);
    void prepareForSatelliteWindow(QString name, int width, int height);

src/cpp/desktop/DesktopUtils.cpp

@@ -26,6 +26,13 @@ using namespace core;
 
 namespace desktop {
 
+#ifndef Q_OS_MAC
+bool isRetina(QMainWindow* pMainWindow)
+{
+   return false;
+}
+#endif
+
 void raiseAndActivateWindow(QWidget* pWindow)
 {
    // WId wid = pWindow->effectiveWinId(); -- gets X11 window id

src/cpp/desktop/DesktopUtils.hpp

@@ -16,9 +16,12 @@
 
 #include <QUrl>
 #include <QMessageBox>
+#include <QMainWindow>
 
 namespace desktop {
 
+bool isRetina(QMainWindow* pMainWindow);
+
 void raiseAndActivateWindow(QWidget* pWindow);
 
 QMessageBox::Icon safeMessageBoxIcon(QMessageBox::Icon icon);

src/cpp/desktop/DesktopUtilsMac.mm

@@ -0,0 +1,36 @@
+/*
+ * DesktopUtilsMac.mm
+ *
+ * Copyright (C) 2009-12 by RStudio, Inc.
+ *
+ * This program is licensed to you under the terms of version 3 of the
+ * GNU Affero General Public License. This program is distributed WITHOUT
+ * ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
+ * AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
+ *
+ */
+
+#include "DesktopUtils.hpp"
+
+#include <QWidget>
+
+namespace desktop {
+
+bool isRetina(QMainWindow* pMainWindow)
+{
+   OSWindowRef macWindow = qt_mac_window_for(pMainWindow);
+   NSWindow* pWindow = (NSWindow*)macWindow;
+
+   if ([pWindow respondsToSelector:@selector(backingScaleFactor)])
+   {
+      double scaleFactor = [pWindow backingScaleFactor];
+      return scaleFactor == 2.0;
+   }
+   else
+   {
+      return false;
+   }
+}
+
+} // namespace desktop

src/gwt/src/org/rstudio/core/client/BrowseCap.java

@@ -111,6 +111,28 @@ public static boolean isChromeFrame()
       return isUserAgent("chromeframe");
    }
 
+   public static boolean isRetina() 
+   {
+      if (Desktop.isDesktop())
+         return Desktop.getFrame().isRetina();
+      else
+         return getIsRetina();
+   }
+
+   private static native final boolean getIsRetina() /*-{
+      try
+      {
+         return ((('devicePixelRatio' in $wnd) && 
+                  ($wnd.devicePixelRatio == 2)) ||
+                (('matchMedia' in $wnd) && 
+                 $wnd.matchMedia("(min-resolution:144dpi)").matches));
+      }
+      catch(ex)
+      {
+         return false;
+      }
+   }-*/;
+
    private static native final boolean isUserAgent(String uaTest) /*-{
       var ua = navigator.userAgent.toLowerCase();
       if (ua.indexOf(uaTest) != -1)

src/gwt/src/org/rstudio/studio/client/application/DesktopFrame.java

@@ -77,6 +77,8 @@ JsObject promptForText(String title,
    String chooseRVersion();
    boolean canChooseRVersion();
 
+   boolean isRetina();
+
    void cleanClipboard();
 
    public static final int PENDING_RESTART_NONE = 0;