src/share/classes/javax/swing/RepaintManager.java

@@ -43,10 +43,14 @@
 import sun.misc.JavaSecurityAccess;
 import sun.misc.SharedSecrets;
 import sun.security.action.GetPropertyAction;
 
 import com.sun.java.swing.SwingUtilities3;
+import sun.awt.image.OffScreenImage;
+import sun.awt.image.SurfaceManager;
+import sun.java2d.SunGraphics2D;
+import sun.swing.JLightweightFrame;
 
 /**
  * This class manages repaint requests, allowing the number
  * of repaints to be minimized, for example by collapsing multiple
  * requests into a single repaint for members of a component tree.

@@ -1071,14 +1075,24 @@
             }
             width = Math.max(doubleBuffer.size.width, width);
             height = Math.max(doubleBuffer.size.height, height);
         }
 
+        Graphics g = c.getGraphics();
+        int scale = g instanceof SunGraphics2D ?
+            ((SunGraphics2D)g).surfaceData.getDefaultScale() : 1;
+        
         Image result = doubleBuffer.image;
 
-        if (doubleBuffer.image == null) {
-            result = c.createImage(width , height);
+        if (doubleBuffer.image == null ||
+            SurfaceManager.getImageScale(doubleBuffer.image) != scale)
+        {
+            if (w instanceof JLightweightFrame) {
+                result = ((JLightweightFrame)w).createHiDPIImage(width, height);
+            } else {
+                result = c.createImage(width, height);
+            }            
             doubleBuffer.size = new Dimension(width, height);
             if (c instanceof JComponent) {
                 ((JComponent)c).setCreatedDoubleBuffer(true);
                 doubleBuffer.image = result;
             }

@@ -1510,12 +1524,18 @@
          */
         protected void paintDoubleBuffered(JComponent c, Image image,
                             Graphics g, int clipX, int clipY,
                             int clipW, int clipH) {
             Graphics osg = image.getGraphics();
-            int bw = Math.min(clipW, image.getWidth(null));
-            int bh = Math.min(clipH, image.getHeight(null));
+            int lw = image.getWidth(null);
+            int lh = image.getHeight(null);
+            if (image instanceof OffScreenImage) {
+                lw = ((OffScreenImage)image).getLayoutWidth();
+                lh = ((OffScreenImage)image).getLayoutHeight();
+            }
+            int bw = Math.min(clipW, lw);
+            int bh = Math.min(clipH, lh);
             int x,y,maxx,maxy;
 
             try {
                 for(x = clipX, maxx = clipX+clipW; x < maxx ;  x += bw ) {
                     for(y=clipY, maxy = clipY + clipH; y < maxy ; y += bh) {

@@ -1534,14 +1554,14 @@
                         if (volatileBufferType != Transparency.OPAQUE
                                 && g instanceof Graphics2D) {
                             final Graphics2D g2d = (Graphics2D) g;
                             final Composite oldComposite = g2d.getComposite();
                             g2d.setComposite(AlphaComposite.Src);
-                            g2d.drawImage(image, x, y, c);
+                            g2d.drawImage(image, x, y, lw, lh, c);
                             g2d.setComposite(oldComposite);
                         } else {
-                            g.drawImage(image, x, y, c);
+                            g.drawImage(image, x, y, lw, lh, c);
                         }
                         osg.translate(x, y);
                     }
                 }
             } finally {