Backport detection of pixel-scale change JAWTWindow/GLCanvas and GLJPanel

Partial backport of commit 6516a52d3da5cced924db63b64af911d55355325:
- Detect change of pixel-scale and propagate accordingly.
  This allows GLCanvas, GLJPanel instances
  to be dragged between monitor devices w/ different pixel-scale.
- NOT NewtCanvasAWT

Partial backport of commit b0af5159bc6100a6262afe6b52f9092a207ac2b3:
  Bug 1181 - JOGL WebStart Applications using GLCanvas/AWT may Deadlock by two AWT-EDT on Java >= 1.8.0_45

2 files changed, 30 insertions, 1 deletions

diff --git a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
index a648e3bf6..ed64914d1 100644
--- a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
+++ b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
@@ -659,6 +659,17 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
       }
   }
 
+  final boolean updatePixelScale() {
+      if( jawtWindow.hasPixelScaleChanged() ) {
+          jawtWindow.getNativeSurfaceScale(nativePixelScale);
+          jawtWindow.setSurfaceScale(reqPixelScale);
+          jawtWindow.getCurrentSurfaceScale(hasPixelScale);
+          return true;
+      } else {
+          return false;
+      }
+  }
+
   @Override
   public final int[] getRequestedSurfaceScale(final int[] result) {
       System.arraycopy(reqPixelScale, 0, result, 0, 2);
@@ -786,7 +797,7 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
     }
   }
 
-  private void reshapeImpl(final int width, final int height) {
+  void reshapeImpl(final int width, final int height) {
     final int scaledWidth = width * hasPixelScale[0];
     final int scaledHeight = height * hasPixelScale[1];
 
@@ -1391,6 +1402,9 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
         _lock.lock();
         try {
             if( null != drawable && drawable.isRealized() ) {
+                if( GLCanvas.this.updatePixelScale() ) {
+                    GLCanvas.this.reshapeImpl(getWidth(), getHeight());
+                }
                 helper.invokeGL(drawable, context, displayAction, initAction);
             }
         } finally {
diff --git a/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java b/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
index a09644951..4bb44596d 100644
--- a/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
+++ b/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
@@ -559,6 +559,7 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
         // re-creating it -- tricky to do properly while the context is
         // current
         if( !printActive ) {
+            updatePixelScale(backend);
             if ( handleReshape ) {
                 handleReshape = false;
                 sendReshape = handleReshape();
@@ -597,6 +598,20 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
       }
   }
 
+  private final boolean updatePixelScale(final Backend b) {
+      final int ps = JAWTUtil.getPixelScale(getGraphicsConfiguration());
+      nativePixelScale[0] = ps;
+      nativePixelScale[1] = ps;
+      if( SurfaceScaleUtils.computePixelScale(hasPixelScale, hasPixelScale, reqPixelScale, nativePixelScale, DEBUG ? getClass().getSimpleName() : null) ) {
+          updateWrappedSurfaceScale(b.getDrawable());
+          reshapeImpl(getWidth(), getHeight());
+          return true;
+      } else {
+          return false;
+      }
+  }
+
+
   @Override
   public final int[] getRequestedSurfaceScale(final int[] result) {
       System.arraycopy(reqPixelScale, 0, result, 0, 2);