src/java.desktop/windows/classes/sun/awt/windows/TranslucentWindowPainter.java

@@ -28,18 +28,20 @@
 import java.awt.Color;
 import java.awt.Graphics2D;
 import java.awt.GraphicsConfiguration;
 import java.awt.Image;
 import java.awt.Window;
+import java.awt.geom.AffineTransform;
 import java.awt.image.BufferedImage;
 import java.awt.image.DataBufferInt;
 import java.awt.image.VolatileImage;
 import java.security.AccessController;
 import sun.awt.image.BufImgSurfaceData;
 import sun.java2d.DestSurfaceProvider;
 import sun.java2d.InvalidPipeException;
 import sun.java2d.Surface;
+import sun.java2d.pipe.Region;
 import sun.java2d.pipe.RenderQueue;
 import sun.java2d.pipe.BufferedContext;
 import sun.java2d.pipe.hw.AccelGraphicsConfig;
 import sun.java2d.pipe.hw.AccelSurface;
 import sun.security.action.GetPropertyAction;

@@ -176,18 +178,23 @@
             super(peer);
         }
 
         @Override
         protected Image getBackBuffer(boolean clear) {
-            int w = window.getWidth();
-            int h = window.getHeight();
+            GraphicsConfiguration gc = peer.getGraphicsConfiguration();
+            AffineTransform transform = gc.getDefaultTransform();
+            int w = Region.clipRound(
+                    window.getWidth() * transform.getScaleX());
+            int h = Region.clipRound(
+                    window.getHeight() * transform.getScaleY());
             if (backBuffer == null ||
                 backBuffer.getWidth() != w ||
                 backBuffer.getHeight() != h)
             {
                 flush();
-                backBuffer = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB_PRE);
+                backBuffer = new BufferedImage(gc, w, h, BufferedImage
+                        .TYPE_INT_ARGB_PRE);
             }
             return clear ? (BufferedImage)clearImage(backBuffer) : backBuffer;
         }
 
         @Override