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

*** 43,52 ****
--- 43,56 ----
  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.
*** 1071,1084 ****
              }
              width = Math.max(doubleBuffer.size.width, width);
              height = Math.max(doubleBuffer.size.height, height);
          }
  
          Image result = doubleBuffer.image;
  
!         if (doubleBuffer.image == null) {
!             result = c.createImage(width , height);
              doubleBuffer.size = new Dimension(width, height);
              if (c instanceof JComponent) {
                  ((JComponent)c).setCreatedDoubleBuffer(true);
                  doubleBuffer.image = result;
              }
--- 1075,1098 ----
              }
              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 ||
!             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;
              }
*** 1510,1521 ****
           */
          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 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) {
--- 1524,1541 ----
           */
          protected void paintDoubleBuffered(JComponent c, Image image,
                              Graphics g, int clipX, int clipY,
                              int clipW, int clipH) {
              Graphics osg = image.getGraphics();
!             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) {
*** 1534,1547 ****
                          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.setComposite(oldComposite);
                          } else {
!                             g.drawImage(image, x, y, c);
                          }
                          osg.translate(x, y);
                      }
                  }
              } finally {
--- 1554,1567 ----
                          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, lw, lh, c);
                              g2d.setComposite(oldComposite);
                          } else {
!                             g.drawImage(image, x, y, lw, lh, c);
                          }
                          osg.translate(x, y);
                      }
                  }
              } finally {