src/java.desktop/macosx/classes/sun/awt/CGraphicsConfig.java

@@ -70,11 +70,12 @@
         throw new UnsupportedOperationException("not implemented");
     }
 
     @Override
     public AffineTransform getDefaultTransform() {
-        return new AffineTransform();
+        double scaleFactor = device.getScaleFactor();
+        return AffineTransform.getScaleInstance(scaleFactor, scaleFactor);
     }
 
     @Override
     public CGraphicsDevice getDevice() {
         return device;