diff -r 9b702b6608f9 -r 187b92b2e32d src/java.desktop/unix/classes/sun/awt/X11/XlibUtil.java
--- a/src/java.desktop/unix/classes/sun/awt/X11/XlibUtil.java	Fri Oct 20 20:08:09 2017 -0700
+++ b/src/java.desktop/unix/classes/sun/awt/X11/XlibUtil.java	Mon Oct 23 16:55:52 2017 +0530
@@ -38,6 +38,8 @@
 import sun.awt.X11GraphicsDevice;
 import sun.awt.X11GraphicsEnvironment;
 
+import sun.java2d.pipe.Region;
+
 /*
  * This class is a collection of utility methods that operate
  * with native windows.
@@ -414,6 +416,6 @@
     }
 
     static int scaleDown(int x, int scale) {
-        return x / scale;
+        return Region.clipRound(x / (double)scale);
     }
 }