2 files changed, 80 insertions, 0 deletions
diff --git a/src/nativewindow/classes/javax/media/nativewindow/NativeWindowFactory.java b/src/nativewindow/classes/javax/media/nativewindow/NativeWindowFactory.java
index 60ce07f09..b6c850098 100644
--- a/src/nativewindow/classes/javax/media/nativewindow/NativeWindowFactory.java
+++ b/src/nativewindow/classes/javax/media/nativewindow/NativeWindowFactory.java
@@ -475,4 +475,33 @@ public abstract class NativeWindowFactory {
         NativeWindow. Implementors of concrete NativeWindowFactory
         subclasses should override this method. */
     protected abstract NativeWindow getNativeWindowImpl(Object winObj, AbstractGraphicsConfiguration config) throws IllegalArgumentException;
+    
+    /**
+     * Returns the {@link OffscreenLayerSurface} instance of this {@link NativeSurface}.
+     * <p>
+     * In case this surface is a {@link NativeWindow}, we traverse from the given surface 
+     * up to root until a {@link OffscreenLayerSurface} is found.
+     * </p>
+     * 
+     * @param surface The surface to query.
+     * @param ifEnabled If true, only return the enabled {@link OffscreenLayerSurface}, see {@link OffscreenLayerSurface#isOffscreenLayerSurfaceEnabled()}. 
+     * @return
+     */
+    public static OffscreenLayerSurface getOffscreenLayerSurface(NativeSurface surface, boolean ifEnabled) {
+        if(surface instanceof OffscreenLayerSurface) {
+            final OffscreenLayerSurface ols = (OffscreenLayerSurface) surface;
+            return ( !ifEnabled || ols.isOffscreenLayerSurfaceEnabled() ) ? ols : null;
+        }
+        if(surface instanceof NativeWindow) {
+            NativeWindow nw = ((NativeWindow) surface).getParent();
+            while(null != nw) {
+                if(nw instanceof OffscreenLayerSurface) {
+                    final OffscreenLayerSurface ols = (OffscreenLayerSurface) nw;
+                    return ( !ifEnabled || ols.isOffscreenLayerSurfaceEnabled() ) ? ols : null;
+                }
+                nw = nw.getParent();                
+            }
+        }
+        return null;            
+    }
 }
diff --git a/src/nativewindow/classes/javax/media/nativewindow/OffscreenLayerSurface.java b/src/nativewindow/classes/javax/media/nativewindow/OffscreenLayerSurface.java
new file mode 100644
index 000000000..82ae0f39e
--- /dev/null
+++ b/src/nativewindow/classes/javax/media/nativewindow/OffscreenLayerSurface.java
@@ -0,0 +1,51 @@
+/**
+ * Copyright 2011 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package javax.media.nativewindow;
+
+/**
+ * Interface specifying the offscreen layer surface protocol.
+ */
+public interface OffscreenLayerSurface {
+  /** Returns true if this instance uses an offscreen layer, otherwise false. */
+  public boolean isOffscreenLayerSurfaceEnabled();
+  
+  /** 
+   * Attach the offscreen layer to this offscreen layer surface.
+   * @see #isOffscreenLayerSurfaceEnabled()
+   * @throws NativeWindowException if {@link #isOffscreenLayerSurfaceEnabled()} == false
+   */
+  public void attachSurfaceLayer(final long layerHandle) throws NativeWindowException;
+  
+  /** 
+   * Detaches a previously attached offscreen layer from this offscreen layer surface.
+   * @see #attachSurfaceLayer(long)
+   * @see #isOffscreenLayerSurfaceEnabled()
+   * @throws NativeWindowException if {@link #isOffscreenLayerSurfaceEnabled()} == false
+   */
+  public void detachSurfaceLayer(final long layerHandle) throws NativeWindowException;
+}