--- a/src/viewer_swing/java/com/glavsoft/viewer/Viewer.java	Thu Jun 23 18:57:12 2016 +0900
+++ b/src/viewer_swing/java/com/glavsoft/viewer/Viewer.java	Thu Jun 23 19:36:31 2016 +0900
@@ -504,6 +504,7 @@
             fbRectangles.add(new FbRectangle(rect.x + offset.x, rect.y + offset.y, rect.width, rect.height, screenNumber, retinaScale(screenNumber)));
             screenNumber++;
         }
+
         fbRectangles.sort(new Comparator<FbRectangle>() {
             @Override
             public int compare(FbRectangle t0, FbRectangle t1) {
@@ -527,6 +528,13 @@
             fbRectanglesPrev = fbRect;
         }
 
+        fbRectangles.sort(new Comparator<FbRectangle>() {
+            @Override
+            public int compare(FbRectangle t0, FbRectangle t1) {
+                return t0.getY() < t1.getY() ? -1 : t0.getY() == t1.getY() ? 0 : 1;
+            }
+        });
+
         int retinaOffsetY = 0;
         fbRectanglesPrev = fbRectangles.get(0);
         for (int i = 1; i < fbRectangles.size(); i++) {
@@ -550,14 +558,9 @@
         // compute offset to make them positive
         int offsetx = 0;
         int offsety = 0;
-        int screenNumber = 0;
         for (Rectangle rect : rectangles) {
-            int scale = retinaScale(screenNumber);
-            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++;
+            if (rect.x < offsetx) offsetx = rect.x;
+            if (rect.y < offsety) offsety = rect.y;
         }
         return new Point(-offsetx,-offsety);
     }