Subject: [PATCH] java-openjfx-build: Cannot compile JFXPanel with JDK 8

In JDKu9 getDefaultScale method was removed and sun.java2d.SurfaceData class now
has separate getDefaultScaleX() and getDefaultScaleY() methods. See
https://bugs.openjdk.java.net/browse/JDK-8073320 for more info.

Backport the missing port to build openjfx-swing package using JDKu8. For more
info please see https://bugs.openjdk.java.net/browse/JDK-8149967

---
 .../java/javafx/embed/swing/JFXPanel.java     | 20 ++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/modules/swing/src/main/java/javafx/embed/swing/JFXPanel.java b/modules/swing/src/main/java/javafx/embed/swing/JFXPanel.java
index 97515e2290..614ed656b9 100644
--- a/modules/swing/src/main/java/javafx/embed/swing/JFXPanel.java
+++ b/modules/swing/src/main/java/javafx/embed/swing/JFXPanel.java
@@ -81,6 +81,7 @@ import sun.awt.AppContext;
 import sun.awt.CausedFocusEvent;
 import sun.awt.SunToolkit;
 import sun.java2d.SunGraphics2D;
+import sun.java2d.SurfaceData;
 import sun.util.logging.PlatformLogger;
 import sun.util.logging.PlatformLogger.Level;

@@ -681,6 +682,23 @@
                 e.getCaret().getInsertionIndex());
     }

+    // FIXME: once we move to JDK 9 as the boot JDK we should remove the
+    // reflection code from this method, consider changing it to
+    // use double rather than int, and account for the possibility of
+    // a different scale factor in X and Y.
+    private int getDefaultScale(SurfaceData surfaceData) {
+        /*
+          double scale = surfaceData.getDefaultScaleX();
+        */
+        double scale = 1;
+        try {
+            Method meth = SurfaceData.class.getMethod("getDefaultScaleX");
+            scale = (Double)meth.invoke(surfaceData);
+        } catch (Exception ex) {
+        }
+
+        return (int)Math.round(scale);
+    }

     /**
      * Overrides the {@link javax.swing.JComponent#paintComponent(Graphics)}
@@ -720,7 +738,7 @@ public class JFXPanel extends JComponent {

             int newScaleFactor = scaleFactor;
             if (g instanceof SunGraphics2D) {
-                newScaleFactor = ((SunGraphics2D)g).surfaceData.getDefaultScale();
+                newScaleFactor = getDefaultScale(((SunGraphics2D)g).surfaceData);
             }
             if (scaleFactor != newScaleFactor) {
                 resizePixelBuffer(newScaleFactor);
--
2.24.1