src/macosx/classes/sun/lwawt/macosx/LWCToolkit.java

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  import java.awt.event.InvocationEvent;
  import java.awt.event.KeyEvent;
  import java.awt.im.InputMethodHighlight;
  import java.awt.peer.*;
  import java.lang.reflect.*;
+ import java.io.File;
+ import java.io.InputStream;
+ import java.net.URL;
  import java.security.*;
  import java.util.*;
  import java.util.concurrent.Callable;
  
  import sun.awt.*;
+ import sun.awt.image.ToolkitImage;
  import sun.lwawt.*;
  import sun.lwawt.LWWindowPeer.PeerType;
  import sun.security.action.GetBooleanAction;
+ import com.sun.awt.MultiResolutionImage;
  
  import sun.util.CoreResourceBundleControl;
  
  class NamedCursor extends Cursor {
      NamedCursor(String name) {
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      }
  
      @Override
      public Image getImage(final String filename) {
          final Image nsImage = checkForNSImage(filename);
!         if (nsImage != null) return nsImage;
  
!         return super.getImage(filename);
      }
  
      static final String nsImagePrefix = "NSImage://";
      protected Image checkForNSImage(final String imageName) {
          if (imageName == null) return null;
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      }
  
      @Override
      public Image getImage(final String filename) {
          final Image nsImage = checkForNSImage(filename);
!         if (nsImage != null) {
!             return nsImage;
!         }
! 
!         Image image = super.getImage(filename);
!         Image scalableImage = ScalableToolkitImage.toScalableImage(image, filename);
!         if (image != scalableImage) {
!             putImageToCache(filename, (ToolkitImage) scalableImage);
!         }
!         return scalableImage;
!     }
! 
!     @Override
!     public Image getImage(URL url) {
!         Image image = super.getImage(url);
!         Image scalableImage = ScalableToolkitImage.toScalableImage(image, url);
!         if (image != scalableImage) {
!             putImageToCache(url, (ToolkitImage) scalableImage);
!         }
!         return scalableImage;
!     }
! 
!     @Override
!     public Image createImage(String filename) {
!         return ScalableToolkitImage.toScalableImage(
!                 super.createImage(filename), filename);
!     }
  
!     @Override
!     public Image createImage(URL url) {
!         return ScalableToolkitImage.toScalableImage(super.createImage(url), url);
      }
  
      static final String nsImagePrefix = "NSImage://";
      protected Image checkForNSImage(final String imageName) {
          if (imageName == null) return null;
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      @Override
      public boolean enableInputMethodsForTextComponent() {
          return true;
      }
+ 
+     public static final class ScalableToolkitImage extends ToolkitImage implements MultiResolutionImage {
+ 
+         Image highResolutionImage;
+ 
+         public ScalableToolkitImage(Image lowResolutionImage, Image highResolutionImage) {
+             super(lowResolutionImage.getSource());
+             this.highResolutionImage = highResolutionImage;
+         }
+ 
+         @Override
+         public Image getResolutionVariant(int width, int height) {
+             return ((width <= getWidth() && height <= getHeight()))
+                     ? this : highResolutionImage;
+         }
+ 
+         static Image toScalableImage(Image image, String fileName) {
+ 
+             if (fileName != null && !fileName.contains("@2x")
+                     && !(image instanceof ScalableToolkitImage)) {
+                 String filename2x = getScaledImageName(fileName);
+                 if (filename2x != null && new File(filename2x).exists()) {
+                     return new ScalableToolkitImage(image, getDefaultToolkit().getImage(filename2x));
+                 }
+             }
+             return image;
+         }
+ 
+         static Image toScalableImage(Image image, URL url) {
+ 
+             if (url != null && !url.toString().contains("@2x")
+                     && !(image instanceof ScalableToolkitImage)) {
+                 try {
+                     URL url2x = getScaledImageURL(url);
+ 
+                     if (url2x != null) {
+                         try (InputStream is = url2x.openStream()) {
+                             return new ScalableToolkitImage(image,
+                                     getDefaultToolkit().getImage(url2x));
+                         }
+                     }
+                 } catch (Exception ignore) {
+                 }
+             }
+             return image;
+         }
+ 
+         private static URL getScaledImageURL(URL url) throws Exception {
+             String scaledImagePath = getScaledImageName(url.getPath());
+             return scaledImagePath == null ? null : new URL(url.getProtocol(),
+                     url.getHost(), url.getPort(), scaledImagePath);
+         }
+ 
+         private static String getScaledImageName(String path) {
+             if (!isValidPath(path)) {
+                 return null;
+             }
+             int slash = path.lastIndexOf('/');
+             String name = (slash < 0) ? path : path.substring(slash + 1);
+ 
+             int dot = name.lastIndexOf('.');
+             String name2x = (dot < 0) ? name + "@2x"
+                     : name.substring(0, dot) + "@2x" + name.substring(dot);
+             return (slash < 0) ? name2x : path.substring(0, slash + 1) + name2x;
+         }
+ 
+         private static boolean isValidPath(String path) {
+             return !path.isEmpty() && !path.endsWith("/") && !path.endsWith(".");
+         }
+ 
+     }
  }