Bug 1430 - Fix Background erase not disabled with AWT GLCanvas and NewtCanvasAWT

Commit c5431f46b7bf64f109315ec78461859dd88f202a
reduced the disableBackgroundErase(..) to SunToolkit's variation which doesn't work on Windows
as it does not act upon the java.awt.Canvas peer post addNotify().

This re-introduces the java.awt.Canvas method via class JAWTUtil.BackgroundEraseControl
and its called only after addNotify() on Windows and ASAP for everyone else.
Method also calles the SunTookit variation just to be sure.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
index 783bc6857..fc885e591 100644
--- a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
+++ b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
@@ -69,6 +69,8 @@ import jogamp.newt.driver.DriverClearFocus;
 import jogamp.opengl.awt.AWTTilePainter;
 
 import com.jogamp.common.ExceptionUtils;
+import com.jogamp.common.os.Platform;
+import com.jogamp.common.os.Platform.OSType;
 import com.jogamp.common.util.awt.AWTEDTExecutor;
 import com.jogamp.nativewindow.awt.AWTGraphicsConfiguration;
 import com.jogamp.nativewindow.awt.AWTPrintLifecycle;
@@ -100,6 +102,8 @@ import com.jogamp.opengl.util.TileRenderer;
 public class NewtCanvasAWT extends java.awt.Canvas implements NativeWindowHolder, WindowClosingProtocol, OffscreenLayerOption, AWTPrintLifecycle {
     public static final boolean DEBUG = Debug.debug("Window");
 
+    private static JAWTUtil.BackgroundEraseControl backgroundEraseControl = new JAWTUtil.BackgroundEraseControl();
+
     private final Object sync = new Object();
     private volatile JAWTWindow jawtWindow = null; // the JAWTWindow presentation of this AWT Canvas, bound to the 'drawable' lifecycle
     private boolean isApplet = false;
@@ -589,7 +593,9 @@ public class NewtCanvasAWT extends java.awt.Canvas implements NativeWindowHolder
              * This code order also allows recreation, ie re-adding the GLCanvas.
              */
             // before native peer is valid: X11
-            JAWTUtil.disableBackgroundErase(this);
+            if( OSType.WINDOWS != Platform.getOSType() ) {
+                backgroundEraseControl.disable(this);
+            }
 
             // Query AWT GraphicsDevice from parent tree, default
             final GraphicsConfiguration gc = super.getGraphicsConfiguration();
@@ -607,7 +613,9 @@ public class NewtCanvasAWT extends java.awt.Canvas implements NativeWindowHolder
             super.addNotify();
 
             // after native peer is valid: Windows
-            JAWTUtil.disableBackgroundErase(this);
+            if( OSType.WINDOWS == Platform.getOSType() ) {
+                backgroundEraseControl.disable(this);
+            }
 
             synchronized(sync) {
                 determineIfApplet();