--- a/src/main/java/jp/ac/u_ryukyu/treevnc/test/IsRetina.java	Wed Jun 22 19:11:37 2016 +0900
+++ b/src/main/java/jp/ac/u_ryukyu/treevnc/test/IsRetina.java	Wed Jun 22 19:52:32 2016 +0900
@@ -3,37 +3,55 @@
 import java.awt.*;
 import java.awt.image.BufferedImage;
 import java.lang.reflect.Field;
+import java.util.ArrayList;
 
 /**
  * Created by one on 15/08/18.
  */
 public class IsRetina {
-    public static final int isRetina = getRetinaScale();
 
-    private static int getRetinaScale() {
-//other OS and JVM specific checks...
+    public static int getRetinaScale(int shareScreenNumber) {
         int scale = 1;
         GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
-        final GraphicsDevice device = env.getDefaultScreenDevice();
+        final GraphicsDevice[] devices = env.getScreenDevices();
 
         try {
-            Field field = device.getClass().getDeclaredField("scale");
+            Field field = devices[shareScreenNumber].getClass().getDeclaredField("scale");
 
             if (field != null) {
                 field.setAccessible(true);
-                Object retinaScale = field.get(device);
+                Object retinaScale = field.get(devices[shareScreenNumber]);
 
                 if (retinaScale instanceof Integer) {
-                    scale = ((Integer)retinaScale).intValue();
+                    scale = (Integer) retinaScale;
                     return scale;
                 }
             }
         } catch (Exception ignore) {}
-        //...
         return scale;
     }
 
+    public static ArrayList<Rectangle> getScreenRectangles() {
+        // New screen server has one or more screens.
+        // Screens are numbered in the order from left.
+        // put screens in an ArrayList.
+        ArrayList<Rectangle> rectangles = new ArrayList<Rectangle>();
+        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
+        GraphicsDevice[] gs = ge.getScreenDevices();
+        int screenNumber = 0;
+        for (GraphicsDevice gd : gs) {
+            for (GraphicsConfiguration r : gd.getConfigurations()) {
+                System.out.println("Retina scale :" + getRetinaScale(screenNumber));
+                Rectangle rect = r.getBounds();
+                System.out.println("screen "+ screenNumber +":"+rect);
+                rectangles.add(rect);
+            }
+            screenNumber++;
+        }
+        return rectangles;
+    }
+
     public static void main(String args[]) {
-        System.out.println(isRetina);
+        getScreenRectangles();
     }
 }

--- a/src/viewer_swing/java/com/glavsoft/viewer/Viewer.java	Wed Jun 22 19:11:37 2016 +0900
+++ b/src/viewer_swing/java/com/glavsoft/viewer/Viewer.java	Wed Jun 22 19:52:32 2016 +0900
@@ -507,8 +507,8 @@
         int screenNumber = 0;
         for (Rectangle rect : rectangles) {
             int scale = retinaScale(screenNumber);
-            int x = rect.x < 0 ? rect.x * scale : rect.x;
-            int y = rect.y < 0 ? rect.y * scale : rect.y;
+            int x = rect.x == -rect.width  ? rect.x * scale : rect.x;
+            int y = rect.y == -rect.height ? rect.y * scale : rect.y;
             if (x < offsetx) offsetx = x;
             if (y < offsety) offsety = y;
             screenNumber++;