NativeWindow ProxySurface Abstraction and lock/unlock Surface cleanup

- ProxySurface -> abstract javax.media.nativewindow.ProxySurface,
  implemented by
    jogamp.nativewindow.WrappedSurface, just wrapping surface handle
    jogamp.nativewindow.windows.GDISurface, using HWND and get/release HDC on lock/unlock

- Unifying NativeSurface's lockSurface/unlockSurface implementations
    - NEWT's WindowImpl
    - NativeWindow's ProxySurface, WrappedWindow, GDIWindow and JAWTWindow

- wingdi/GDI: Add 'WindowFromDC' and 'GetClientRect' to GDI

18 files changed, 399 insertions, 325 deletions

diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java b/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java
index b6f5dabd3..f81e5a70e 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java
@@ -43,7 +43,7 @@ import javax.media.opengl.*;
 import com.jogamp.common.JogampRuntimeException;
 import com.jogamp.common.util.*;
 import jogamp.opengl.*;
-import jogamp.nativewindow.ProxySurface;
+import jogamp.nativewindow.WrappedSurface;
 
 import java.util.HashMap;
 import java.util.List;
@@ -220,7 +220,7 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
     }
 
     protected NativeSurface createOffscreenSurfaceImpl(AbstractGraphicsDevice device, GLCapabilitiesImmutable capsChosen, GLCapabilitiesImmutable capsRequested, GLCapabilitiesChooser chooser, int width, int height) {
-        ProxySurface ns = new ProxySurface(EGLGraphicsConfigurationFactory.createOffscreenGraphicsConfiguration(device, capsChosen, capsRequested, chooser));
+        WrappedSurface ns = new WrappedSurface(EGLGraphicsConfigurationFactory.createOffscreenGraphicsConfiguration(device, capsChosen, capsRequested, chooser));
         ns.setSize(width, height);
         return ns;
     }
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLExternalContext.java b/src/jogl/classes/jogamp/opengl/egl/EGLExternalContext.java
index 78c23f710..dd06dc148 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLExternalContext.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLExternalContext.java
@@ -40,7 +40,6 @@ import jogamp.opengl.*;
 import javax.media.nativewindow.*;
 
 public class EGLExternalContext extends EGLContext {
-    private boolean firstMakeCurrent = true;
     private GLContext lastContext;
 
     public EGLExternalContext(AbstractGraphicsScreen screen) {
@@ -68,9 +67,6 @@ public class EGLExternalContext extends EGLContext {
     }
 
     protected void makeCurrentImpl(boolean newCreated) throws GLException {
-        if (firstMakeCurrent) {
-            firstMakeCurrent = false;
-        }
     }
 
     protected void releaseImpl() throws GLException {
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
index 19f3ce640..8e27c217b 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
@@ -51,7 +51,7 @@ import javax.media.opengl.*;
 import com.jogamp.common.JogampRuntimeException;
 import com.jogamp.common.util.*;
 import jogamp.opengl.*;
-import jogamp.nativewindow.ProxySurface;
+import jogamp.nativewindow.WrappedSurface;
 
 public class MacOSXCGLDrawableFactory extends GLDrawableFactoryImpl {
   private static final DesktopGLDynamicLookupHelper macOSXCGLDynamicLookupHelper;
@@ -167,7 +167,7 @@ public class MacOSXCGLDrawableFactory extends GLDrawableFactoryImpl {
 
   protected NativeSurface createOffscreenSurfaceImpl(AbstractGraphicsDevice device,GLCapabilitiesImmutable capsChosen, GLCapabilitiesImmutable capsRequested, GLCapabilitiesChooser chooser, int width, int height) {
     AbstractGraphicsScreen screen = DefaultGraphicsScreen.createDefault(NativeWindowFactory.TYPE_MACOSX);
-    ProxySurface ns = new ProxySurface(MacOSXCGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(capsChosen, capsRequested, chooser, screen, true));
+    WrappedSurface ns = new WrappedSurface(MacOSXCGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(capsChosen, capsRequested, chooser, screen, true));
     ns.setSize(width, height);
     return ns;
   }
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXExternalCGLContext.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXExternalCGLContext.java
index e0ee8ea73..af055913d 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXExternalCGLContext.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXExternalCGLContext.java
@@ -44,10 +44,9 @@ import javax.media.opengl.*;
 import jogamp.opengl.*;
 
 import javax.media.nativewindow.*;
-import jogamp.nativewindow.ProxySurface;
+import jogamp.nativewindow.WrappedSurface;
 
 public class MacOSXExternalCGLContext extends MacOSXCGLContext {
-  private boolean firstMakeCurrent = true;
   private GLContext lastContext;
 
   private MacOSXExternalCGLContext(Drawable drawable, boolean isNSContext, long handle) {
@@ -100,7 +99,7 @@ public class MacOSXExternalCGLContext extends MacOSXCGLContext {
     AbstractGraphicsScreen aScreen = DefaultGraphicsScreen.createDefault(NativeWindowFactory.TYPE_MACOSX);
     MacOSXCGLGraphicsConfiguration cfg = new MacOSXCGLGraphicsConfiguration(aScreen, caps, caps, pixelFormat);
 
-    ProxySurface ns = new ProxySurface(cfg);
+    WrappedSurface ns = new WrappedSurface(cfg);
     ns.setSurfaceHandle(currentDrawable);
     return new MacOSXExternalCGLContext(new Drawable(factory, ns), isNSContext, contextHandle);
   }
@@ -127,9 +126,6 @@ public class MacOSXExternalCGLContext extends MacOSXCGLContext {
   }
 
   protected void makeCurrentImpl(boolean newCreated) throws GLException {
-    if (firstMakeCurrent) {
-      firstMakeCurrent = false;
-    }
   }
 
   protected void releaseImpl() throws GLException {
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsDummyWGLDrawable.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsDummyWGLDrawable.java
index 27d7b342e..3d0cce725 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsDummyWGLDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsDummyWGLDrawable.java
@@ -45,29 +45,21 @@ import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLProfile;
 
 import javax.media.nativewindow.AbstractGraphicsScreen;
-import jogamp.nativewindow.ProxySurface;
 import jogamp.nativewindow.windows.GDI;
-import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.opengl.GLCapabilities;
-import javax.media.opengl.GLCapabilitiesImmutable;
 import javax.media.opengl.GLException;
+import jogamp.nativewindow.windows.GDISurface;
 
 public class WindowsDummyWGLDrawable extends WindowsWGLDrawable {
-  private static final int f_dim = 64;
-  private long hwnd, hdc;
+  private long hwnd;
+  private boolean handleHwndLifecycle;
 
-  protected WindowsDummyWGLDrawable(GLDrawableFactory factory, GLCapabilitiesImmutable caps, AbstractGraphicsScreen absScreen) {
-    super(factory, new ProxySurface(WindowsWGLGraphicsConfigurationFactory.createDefaultGraphicsConfiguration(caps, absScreen)), true);
-    hwnd = GDI.CreateDummyWindow(0, 0, f_dim, f_dim);
-    if(0 == hwnd) {
-        throw new GLException("Error hwnd 0, werr: "+GDI.GetLastError());
-    }
-    // manual debug only - GDI.ShowWindow(hwnd, GDI.SW_SHOW);
-    ProxySurface ns = (ProxySurface) getNativeSurface();
-    ns.setSize(f_dim, f_dim);
+  private WindowsDummyWGLDrawable(GLDrawableFactory factory, GDISurface ns, boolean handleHwndLifecycle) {
+    super(factory, ns, true);
+    this.handleHwndLifecycle = handleHwndLifecycle;
     
-    if(NativeSurface.LOCK_SURFACE_NOT_READY >= lockSurface()) {
+    if(NativeSurface.LOCK_SURFACE_NOT_READY >= ns.lockSurface()) {
         throw new GLException("WindowsDummyWGLDrawable: surface not ready (lockSurface)");
     }
     try {
@@ -84,70 +76,16 @@ public class WindowsDummyWGLDrawable extends WindowsWGLDrawable {
     }
   }
 
-  public static WindowsDummyWGLDrawable create(GLDrawableFactory factory, GLProfile glp, AbstractGraphicsScreen absScreen) {
-      GLCapabilities caps = new GLCapabilities(glp);
-      caps.setDepthBits(16);
-      caps.setDoubleBuffered(true);
-      caps.setOnscreen  (true);
-      return new WindowsDummyWGLDrawable(factory, caps, absScreen);
-  }
-
-  public int lockSurface() throws GLException {
-    int res = NativeSurface.LOCK_SURFACE_NOT_READY;
-    ProxySurface ns = (ProxySurface) getNativeSurface();
-    AbstractGraphicsDevice adevice = ns.getGraphicsConfiguration().getNativeGraphicsConfiguration().getScreen().getDevice();
-    adevice.lock();
-    try {
-        res = ns.lockSurface();
-        if(NativeSurface.LOCK_SUCCESS == res) {
-            if(0 == hdc) {
-                hdc = GDI.GetDC(hwnd);
-                ns.setSurfaceHandle(hdc);
-                if(0 == hdc) {
-                    res = NativeSurface.LOCK_SURFACE_NOT_READY;
-                    ns.unlockSurface();
-                    throw new GLException("Error hdc 0, werr: "+GDI.GetLastError());
-                    // finally will unlock adevice
-                }
-            }
-        } else {
-            Throwable t = new Throwable("Error lock failed - res "+res+", hwnd "+toHexString(hwnd)+", hdc "+toHexString(hdc));
-            t.printStackTrace();
-        }
-    } finally {
-        if( NativeSurface.LOCK_SURFACE_NOT_READY == res ) {
-            adevice.unlock();
-        }
+  public static WindowsDummyWGLDrawable create(GLDrawableFactory factory, GLProfile glp, AbstractGraphicsScreen absScreen,
+                                               long windowHandle, int width, int height, boolean handleWindowLifecycle) {
+    if(0 == windowHandle) {
+        throw new GLException("Error windowHandle 0, werr: "+GDI.GetLastError());
     }
-    return res;
-  }
-
-  public void unlockSurface() {
-    ProxySurface ns = (ProxySurface) getNativeSurface();
-    ns.validateSurfaceLocked();
-    AbstractGraphicsDevice adevice = ns.getGraphicsConfiguration().getNativeGraphicsConfiguration().getScreen().getDevice();
-    
-    try {
-        if ( 0 != hdc && 0 != hwnd && ns.getSurfaceRecursionCount() == 0) {
-            GDI.ReleaseDC(hwnd, hdc);
-            hdc=0;
-            ns.setSurfaceHandle(hdc);
-        }
-        surface.unlockSurface();
-    } finally {
-        adevice.unlock();
-    }
-  }
-
-  public void setSize(int width, int height) {
-  }
-
-  public int getWidth() {
-    return 1;
-  }
-
-  public int getHeight() {
-    return 1;
+    GLCapabilities caps = new GLCapabilities(glp);
+    WindowsWGLGraphicsConfiguration cfg = WindowsWGLGraphicsConfigurationFactory.createDefaultGraphicsConfiguration(caps, absScreen);
+    GDISurface ns = new GDISurface(cfg, windowHandle);
+    ns.setSize(width, height);
+    return new WindowsDummyWGLDrawable(factory, ns, handleWindowLifecycle);
   }
 
   public GLContext createContext(GLContext shareWith) {
@@ -156,13 +94,7 @@ public class WindowsDummyWGLDrawable extends WindowsWGLDrawable {
   }
 
   protected void destroyImpl() {
-    if (hdc != 0) {
-      GDI.ReleaseDC(hwnd, hdc);
-      hdc = 0;
-      ProxySurface ns = (ProxySurface) getNativeSurface();
-      ns.setSurfaceHandle(hdc);
-    }
-    if (hwnd != 0) {
+    if (handleHwndLifecycle && hwnd != 0) {
       GDI.ShowWindow(hwnd, GDI.SW_HIDE);
       GDI.DestroyDummyWindow(hwnd);
       hwnd = 0;
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLDrawable.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLDrawable.java
index 742a42709..7666ae350 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLDrawable.java
@@ -49,7 +49,7 @@ import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
-import jogamp.nativewindow.ProxySurface;
+import jogamp.nativewindow.WrappedSurface;
 import jogamp.nativewindow.windows.GDI;
 
 public class WindowsExternalWGLDrawable extends WindowsWGLDrawable {
@@ -70,7 +70,7 @@ public class WindowsExternalWGLDrawable extends WindowsWGLDrawable {
 
     AbstractGraphicsScreen aScreen = DefaultGraphicsScreen.createDefault(NativeWindowFactory.TYPE_WINDOWS);
     WindowsWGLGraphicsConfiguration cfg = WindowsWGLGraphicsConfiguration.createFromCurrent(factory, hdc, pfdID, glp, aScreen, true);
-    return new WindowsExternalWGLDrawable(factory, new ProxySurface(cfg, hdc));
+    return new WindowsExternalWGLDrawable(factory, new WrappedSurface(cfg, hdc));
   }
 
 
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java
index 2c078dd98..5afbb9218 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java
@@ -51,6 +51,7 @@ import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.nativewindow.AbstractGraphicsScreen;
 import javax.media.nativewindow.DefaultGraphicsScreen;
 import javax.media.nativewindow.NativeSurface;
+import javax.media.nativewindow.ProxySurface;
 import javax.media.nativewindow.NativeWindowFactory;
 import javax.media.nativewindow.windows.WindowsGraphicsDevice;
 import javax.media.nativewindow.AbstractGraphicsConfiguration;
@@ -64,11 +65,11 @@ import javax.media.opengl.GLProfile;
 import com.jogamp.common.JogampRuntimeException;
 import com.jogamp.common.nio.PointerBuffer;
 import com.jogamp.common.util.ReflectionUtil;
-import jogamp.nativewindow.ProxySurface;
+import jogamp.nativewindow.WrappedSurface;
 import jogamp.nativewindow.windows.GDI;
+import jogamp.nativewindow.windows.GDISurface;
 import jogamp.nativewindow.windows.RegisteredClassFactory;
 import jogamp.opengl.DesktopGLDynamicLookupHelper;
-import jogamp.opengl.GLContextImpl;
 import jogamp.opengl.GLDrawableFactoryImpl;
 import jogamp.opengl.GLDrawableImpl;
 import jogamp.opengl.GLDynamicLookupHelper;
@@ -228,7 +229,9 @@ public class WindowsWGLDrawableFactory extends GLDrawableFactoryImpl {
                 if (null == glp) {
                     throw new GLException("Couldn't get default GLProfile for device: "+sharedDevice);
                 }
-                WindowsDummyWGLDrawable sharedDrawable = WindowsDummyWGLDrawable.create(WindowsWGLDrawableFactory.this, glp, absScreen);
+                final int f_dim = 64;
+                long hwnd = GDI.CreateDummyWindow(0, 0, f_dim, f_dim);
+                WindowsDummyWGLDrawable sharedDrawable = WindowsDummyWGLDrawable.create(WindowsWGLDrawableFactory.this, glp, absScreen, hwnd, f_dim, f_dim, true);
                 if (null == sharedDrawable) {
                     throw new GLException("Couldn't create shared drawable for screen: "+absScreen+", "+glp);
                 }
@@ -434,9 +437,9 @@ public class WindowsWGLDrawableFactory extends GLDrawableFactoryImpl {
     return false;
   }
 
-  protected final NativeSurface createOffscreenSurfaceImpl(AbstractGraphicsDevice device,GLCapabilitiesImmutable capsChosen, GLCapabilitiesImmutable capsRequested, GLCapabilitiesChooser chooser, int width, int height) {
+  protected final NativeSurface createOffscreenSurfaceImpl(AbstractGraphicsDevice device, GLCapabilitiesImmutable capsChosen, GLCapabilitiesImmutable capsRequested, GLCapabilitiesChooser chooser, int width, int height) {
     AbstractGraphicsScreen screen = DefaultGraphicsScreen.createDefault(NativeWindowFactory.TYPE_WINDOWS);
-    ProxySurface ns = new ProxySurface(WindowsWGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(
+    WrappedSurface ns = new WrappedSurface(WindowsWGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(
                                      capsChosen, capsRequested, chooser, screen) );
     ns.setSize(width, height);
     return ns;
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11DummyGLXDrawable.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11DummyGLXDrawable.java
index 202bba9e7..68bdb4ab8 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11DummyGLXDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11DummyGLXDrawable.java
@@ -45,11 +45,11 @@ public class X11DummyGLXDrawable extends X11OnscreenGLXDrawable {
    */
   public X11DummyGLXDrawable(X11GraphicsScreen screen, GLDrawableFactory factory, GLCapabilitiesImmutable caps) {
     super(factory, 
-          new ProxySurface(X11GLXGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(
+          new WrappedSurface(X11GLXGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(
             caps, caps, null, screen)));
     this.realized = true;
 
-    ProxySurface ns = (ProxySurface) getNativeSurface();
+    WrappedSurface ns = (WrappedSurface) getNativeSurface();
     X11GLXGraphicsConfiguration config = (X11GLXGraphicsConfiguration)ns.getGraphicsConfiguration().getNativeGraphicsConfiguration();
 
     X11GraphicsDevice device = (X11GraphicsDevice) screen.getDevice();
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXContext.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXContext.java
index 769d5f1da..c488fe5cf 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXContext.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXContext.java
@@ -44,10 +44,9 @@ import javax.media.nativewindow.*;
 import javax.media.nativewindow.x11.*;
 import javax.media.opengl.*;
 import jogamp.opengl.*;
-import jogamp.nativewindow.ProxySurface;
+import jogamp.nativewindow.WrappedSurface;
 
 public class X11ExternalGLXContext extends X11GLXContext {
-  private boolean firstMakeCurrent = true;
   private GLContext lastContext;
 
   private X11ExternalGLXContext(Drawable drawable, long ctx) {
@@ -78,7 +77,7 @@ public class X11ExternalGLXContext extends X11GLXContext {
     GLX.glXQueryContext(display, ctx, GLX.GLX_FBCONFIG_ID, val, 0);
     X11GLXGraphicsConfiguration cfg = X11GLXGraphicsConfiguration.create(glp, x11Screen, val[0]);
 
-    ProxySurface ns = new ProxySurface(cfg);
+    WrappedSurface ns = new WrappedSurface(cfg);
     ns.setSurfaceHandle(drawable);
     return new X11ExternalGLXContext(new Drawable(factory, ns), ctx);
   }
@@ -105,9 +104,6 @@ public class X11ExternalGLXContext extends X11GLXContext {
   }
 
   protected void makeCurrentImpl(boolean newCreated) throws GLException {
-    if (firstMakeCurrent) {
-      firstMakeCurrent = false;
-    }
   }
 
   protected void releaseImpl() throws GLException {
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXDrawable.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXDrawable.java
index 014992b88..eb286cdf0 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXDrawable.java
@@ -42,7 +42,7 @@ package jogamp.opengl.x11.glx;
 import javax.media.nativewindow.*;
 import javax.media.nativewindow.x11.*;
 import javax.media.opengl.*;
-import jogamp.nativewindow.ProxySurface;
+import jogamp.nativewindow.WrappedSurface;
 
 
 public class X11ExternalGLXDrawable extends X11GLXDrawable {
@@ -83,7 +83,7 @@ public class X11ExternalGLXDrawable extends X11GLXDrawable {
         System.err.println("X11ExternalGLXDrawable: WARNING: forcing GLX_RGBA_TYPE for newly created contexts (current 0x"+Integer.toHexString(val[0])+")");
       }
     }
-    ProxySurface ns = new ProxySurface(cfg);
+    WrappedSurface ns = new WrappedSurface(cfg);
     ns.setSurfaceHandle(drawable);
     ns.setSize(w, h);
     return new X11ExternalGLXDrawable(factory, ns);
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java
index 44ade1513..755c078b9 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java
@@ -49,7 +49,7 @@ import javax.media.opengl.*;
 import jogamp.opengl.*;
 import com.jogamp.common.JogampRuntimeException;
 import com.jogamp.common.util.*;
-import jogamp.nativewindow.ProxySurface;
+import jogamp.nativewindow.WrappedSurface;
 import jogamp.nativewindow.x11.*;
 
 public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
@@ -399,7 +399,7 @@ public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
         return null;
     }
 
-    ProxySurface ns = new ProxySurface(
+    WrappedSurface ns = new WrappedSurface(
                X11GLXGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(capsChosen, capsRequested, chooser, screen) );
     if(ns != null) {
         ns.setSize(width, height);
diff --git a/src/nativewindow/classes/javax/media/nativewindow/ProxySurface.java b/src/nativewindow/classes/javax/media/nativewindow/ProxySurface.java
new file mode 100644
index 000000000..386ba32f4
--- /dev/null
+++ b/src/nativewindow/classes/javax/media/nativewindow/ProxySurface.java
@@ -0,0 +1,155 @@
+/**
+ * Copyright 2010 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;
+
+import com.jogamp.common.util.locks.RecursiveLock;
+
+public abstract class ProxySurface implements NativeSurface {
+    protected RecursiveLock recurLock = new RecursiveLock();
+    protected AbstractGraphicsConfiguration config;
+    protected long displayHandle;
+    protected int height;
+    protected int scrnIndex;
+    protected int width;
+
+    public ProxySurface(AbstractGraphicsConfiguration cfg) {
+        invalidate();
+        config = cfg;
+        displayHandle=cfg.getScreen().getDevice().getHandle();
+    }
+
+    public final void invalidate() {
+        recurLock.lock();
+        try {
+            displayHandle = 0;
+            invalidateImpl();
+        } finally {
+            recurLock.unlock();
+        }
+    }
+    protected abstract void invalidateImpl();
+
+    public final long getDisplayHandle() {
+        return displayHandle;
+    }
+
+    public final AbstractGraphicsConfiguration getGraphicsConfiguration() {
+        return config;
+    }
+
+    public final int getScreenIndex() {
+        return config.getScreen().getIndex();
+    }
+
+    public abstract long getSurfaceHandle();
+
+    public final int getWidth() {
+        return width;
+    }
+
+    public final int getHeight() {
+        return height;
+    }
+
+    public void setSize(int width, int height) {
+        this.width = width;
+        this.height = height;
+    }
+
+    public boolean surfaceSwap() {
+        return false;
+    }
+
+    public void surfaceUpdated(Object updater, NativeSurface ns, long when) {
+    }
+
+    public int lockSurface() throws NativeWindowException {
+        recurLock.lock();
+        int res = recurLock.getRecursionCount() == 0 ? LOCK_SURFACE_NOT_READY : LOCK_SUCCESS;
+
+        if ( LOCK_SURFACE_NOT_READY == res ) {
+            try {
+                final AbstractGraphicsDevice adevice = config.getScreen().getDevice();
+                adevice.lock();
+                try {
+                    res = lockSurfaceImpl();
+                } finally {
+                    if (LOCK_SURFACE_NOT_READY >= res) {
+                        adevice.unlock();
+                    }
+                }
+            } finally {
+                if (LOCK_SURFACE_NOT_READY >= res) {
+                    recurLock.unlock();
+                }
+            }
+        }
+        return res;
+    }
+
+    public final void unlockSurface() {
+        recurLock.validateLocked();
+
+        if (recurLock.getRecursionCount() == 0) {
+            final AbstractGraphicsDevice adevice = config.getScreen().getDevice();
+            try {
+                unlockSurfaceImpl();
+            } finally {
+                adevice.unlock();
+            }
+        }
+        recurLock.unlock();
+    }
+
+    protected abstract int lockSurfaceImpl();
+
+    protected abstract void unlockSurfaceImpl() ;
+
+    public final void validateSurfaceLocked() {
+        recurLock.validateLocked();
+    }
+
+    public final boolean isSurfaceLocked() {
+        return recurLock.isLocked();
+    }
+
+    public final boolean isSurfaceLockedByOtherThread() {
+        return recurLock.isLockedByOtherThread();
+    }
+
+    public final Thread getSurfaceLockOwner() {
+        return recurLock.getOwner();
+    }
+
+    public final int getSurfaceRecursionCount() {
+        return recurLock.getRecursionCount();
+    }
+
+    public abstract String toString();
+}
diff --git a/src/nativewindow/classes/jogamp/nativewindow/ProxySurface.java b/src/nativewindow/classes/jogamp/nativewindow/ProxySurface.java
deleted file mode 100644
index 6dfbb2a91..000000000
--- a/src/nativewindow/classes/jogamp/nativewindow/ProxySurface.java
+++ /dev/null
@@ -1,171 +0,0 @@
-/*
- * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
- * Copyright (c) 2010 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:
- * 
- * - Redistribution of source code must retain the above copyright
- *   notice, this list of conditions and the following disclaimer.
- * 
- * - Redistribution 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.
- * 
- * Neither the name of Sun Microsystems, Inc. or the names of
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- * 
- * This software is provided "AS IS," without a warranty of any kind. ALL
- * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
- * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
- * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
- * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
- * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
- * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
- * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
- * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
- * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
- * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
- * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
- * 
- * You acknowledge that this software is not designed or intended for use
- * in the design, construction, operation or maintenance of any nuclear
- * facility.
- */
-
-package jogamp.nativewindow;
-
-import javax.media.nativewindow.AbstractGraphicsConfiguration;
-import javax.media.nativewindow.NativeSurface;
-import javax.media.nativewindow.NativeWindow;
-import javax.media.nativewindow.NativeWindowException;
-import javax.media.nativewindow.SurfaceChangeable;
-
-import com.jogamp.common.util.locks.RecursiveLock;
-
-public class ProxySurface implements NativeSurface, SurfaceChangeable {
-  private RecursiveLock recurLock = new RecursiveLock();
-  protected AbstractGraphicsConfiguration config;
-  protected long displayHandle;
-  protected long surfaceHandle;
-  protected int scrnIndex;
-  protected int width, height;
-
-  public ProxySurface(AbstractGraphicsConfiguration cfg) {
-      this(cfg, 0);
-  }
-
-  public ProxySurface(AbstractGraphicsConfiguration cfg, long handle) {
-    invalidate();
-    config = cfg;
-    displayHandle=cfg.getScreen().getDevice().getHandle();
-    surfaceHandle=handle;
-    scrnIndex=cfg.getScreen().getIndex();
-  }
-
-  protected void init(Object windowObject) throws NativeWindowException {
-  }
-
-  protected void initNative() throws NativeWindowException {
-  }
-
-  public NativeWindow getParent() {
-    return null;
-  }
-
-  public void destroy() {
-    invalidate();
-  }
-
-  public synchronized void invalidate() {
-    displayHandle=0;
-    scrnIndex=-1;
-    surfaceHandle=0;
-  }
-
-  public final int lockSurface() throws NativeWindowException {
-    recurLock.lock();
-
-    if(recurLock.getRecursionCount() == 0) {
-        config.getScreen().getDevice().lock();
-    }
-    return LOCK_SUCCESS;
-  }
-
-  public final void unlockSurface() {
-    recurLock.validateLocked();
-
-    if(recurLock.getRecursionCount()==0) {
-        config.getScreen().getDevice().unlock();
-    }
-    recurLock.unlock();
-  }
-
-  public final void validateSurfaceLocked() {
-      recurLock.validateLocked();
-  }
-
-  public final int getSurfaceRecursionCount() {
-    return recurLock.getRecursionCount();
-  }
-
-  public final boolean isSurfaceLockedByOtherThread() {
-    return recurLock.isLockedByOtherThread();
-  }
-
-  public final boolean isSurfaceLocked() {
-    return recurLock.isLocked();
-  }
-
-  public final Thread getSurfaceLockOwner() {
-    return recurLock.getOwner();
-  }
-
-  public boolean surfaceSwap() {
-    return false;
-  }
-
-  public long getSurfaceHandle() {
-    return surfaceHandle;
-  }
-
-  public int getWidth() {
-    return width;
-  }
-
-  public int getHeight() {
-    return height;
-  }
-
-  public AbstractGraphicsConfiguration getGraphicsConfiguration() {
-    return config;
-  }
-
-  public void surfaceUpdated(Object updater, NativeSurface ns, long when) { }
-
-  public long getDisplayHandle() {
-    return displayHandle;
-  }
-  public int getScreenIndex() {
-    return scrnIndex;
-  }
-  
-  public void setSurfaceHandle(long surfaceHandle) {
-    this.surfaceHandle=surfaceHandle;
-  }
-
-  public void setSize(int width, int height) {
-    this.width=width;
-    this.height=height;
-  }
-
-  public String toString() {
-    return "ProxySurface[config "+config+
-                ", displayHandle 0x"+Long.toHexString(getDisplayHandle())+
-                ", surfaceHandle 0x"+Long.toHexString(getSurfaceHandle())+
-                ", size "+getWidth()+"x"+getHeight()+"]";
-  }
-
-}
diff --git a/src/nativewindow/classes/jogamp/nativewindow/WrappedSurface.java b/src/nativewindow/classes/jogamp/nativewindow/WrappedSurface.java
new file mode 100644
index 000000000..4c2b1c875
--- /dev/null
+++ b/src/nativewindow/classes/jogamp/nativewindow/WrappedSurface.java
@@ -0,0 +1,70 @@
+/**
+ * Copyright 2010 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 jogamp.nativewindow;
+
+import javax.media.nativewindow.AbstractGraphicsConfiguration;
+import javax.media.nativewindow.ProxySurface;
+import javax.media.nativewindow.SurfaceChangeable;
+
+
+public class WrappedSurface extends ProxySurface implements  SurfaceChangeable {
+  protected long surfaceHandle;
+
+  public WrappedSurface(AbstractGraphicsConfiguration cfg) {
+      this(cfg, 0);
+  }
+
+  public WrappedSurface(AbstractGraphicsConfiguration cfg, long handle) {
+    super(cfg);
+    surfaceHandle=handle;
+  }
+  
+  protected final void invalidateImpl() {
+    surfaceHandle = 0;
+  }
+
+  public long getSurfaceHandle() {
+    return surfaceHandle;
+  }
+
+  public void setSurfaceHandle(long surfaceHandle) {
+    this.surfaceHandle=surfaceHandle;
+  }
+
+  protected int lockSurfaceImpl() {
+      return LOCK_SUCCESS;
+  }
+
+  protected void unlockSurfaceImpl() {
+  }
+
+  public String toString() {
+    return "WrappedSurface[config " + config + ", displayHandle 0x" + Long.toHexString(getDisplayHandle()) + ", surfaceHandle 0x" + Long.toHexString(getSurfaceHandle()) + ", size " + getWidth() + "x" + getHeight() + "]";
+  }
+}
diff --git a/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTWindow.java b/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTWindow.java
index 944c08604..0f7f1ee62 100644
--- a/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTWindow.java
+++ b/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTWindow.java
@@ -42,6 +42,7 @@ import com.jogamp.common.util.locks.RecursiveLock;
 import java.awt.Component;
 import java.awt.Window;
 import javax.media.nativewindow.AbstractGraphicsConfiguration;
+import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.NativeWindow;
 import javax.media.nativewindow.NativeWindowException;
@@ -111,25 +112,26 @@ public abstract class JAWTWindow implements NativeWindow {
   protected abstract int lockSurfaceImpl() throws NativeWindowException;
 
   public final int lockSurface() throws NativeWindowException {
-    int res = LOCK_SURFACE_NOT_READY;
-
     recurLock.lock();
+    int res = recurLock.getRecursionCount() == 0 ? LOCK_SURFACE_NOT_READY : LOCK_SUCCESS;
 
-    if(recurLock.getRecursionCount() == 0) {
-        config.getScreen().getDevice().lock();
+    if ( LOCK_SURFACE_NOT_READY == res ) {
         try {
-            res = lockSurfaceImpl();
+            final AbstractGraphicsDevice adevice = config.getScreen().getDevice();
+            adevice.lock();
+            try {
+                res = lockSurfaceImpl();
+            } finally {
+                if (LOCK_SURFACE_NOT_READY >= res) {
+                    adevice.unlock();
+                }
+            }
         } finally {
-            // Unlock in case surface couldn't be locked
-            if(LOCK_SURFACE_NOT_READY >= res ) {
-                config.getScreen().getDevice().unlock();
+            if (LOCK_SURFACE_NOT_READY >= res) {
                 recurLock.unlock();
             }
         }
-    } else {
-        res = LOCK_SUCCESS;
     }
-
     return res;
   }
 
@@ -138,11 +140,12 @@ public abstract class JAWTWindow implements NativeWindow {
   public final void unlockSurface() {
     recurLock.validateLocked();
 
-    if(recurLock.getRecursionCount()==0) {
+    if (recurLock.getRecursionCount() == 0) {
+        final AbstractGraphicsDevice adevice = config.getScreen().getDevice();
         try {
             unlockSurfaceImpl();
         } finally {
-            config.getScreen().getDevice().unlock();
+            adevice.unlock();
         }
     }
     recurLock.unlock();
diff --git a/src/nativewindow/classes/jogamp/nativewindow/windows/GDISurface.java b/src/nativewindow/classes/jogamp/nativewindow/windows/GDISurface.java
new file mode 100644
index 000000000..68cf8af45
--- /dev/null
+++ b/src/nativewindow/classes/jogamp/nativewindow/windows/GDISurface.java
@@ -0,0 +1,87 @@
+/**
+ * Copyright 2010 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 jogamp.nativewindow.windows;
+
+import javax.media.nativewindow.AbstractGraphicsConfiguration;
+import javax.media.nativewindow.NativeWindowException;
+
+import javax.media.nativewindow.ProxySurface;
+
+/**
+ * GDI Surface implementation which wraps an existing window handle
+ * allowing the use of HDC via lockSurface()/unlockSurface() protocol.
+ * The latter will get and release the HDC.
+ * The size via getWidth()/getHeight() is invalid.
+ */
+public class GDISurface extends ProxySurface {
+  protected long windowHandle;
+  protected long surfaceHandle;
+
+  public GDISurface(AbstractGraphicsConfiguration cfg, long windowHandle) {
+    super(cfg);
+    if(0 == windowHandle) {
+        throw new NativeWindowException("Error hwnd 0, werr: "+GDI.GetLastError());
+    }
+    this.windowHandle=windowHandle;
+  }
+
+  protected final void invalidateImpl() {
+    windowHandle=0;
+    surfaceHandle=0;
+  }
+
+  protected int lockSurfaceImpl() {
+    if (0 != surfaceHandle) {
+        throw new InternalError("surface not released");
+    }
+    surfaceHandle = GDI.GetDC(windowHandle);
+    return (0 != surfaceHandle) ? LOCK_SUCCESS : LOCK_SURFACE_NOT_READY;
+  }
+
+  protected void unlockSurfaceImpl() {
+    if (0 == surfaceHandle) {
+        throw new InternalError("surface not acquired");
+    }
+    GDI.ReleaseDC(windowHandle, surfaceHandle);
+    surfaceHandle=0;
+  }
+
+  public long getSurfaceHandle() {
+    return surfaceHandle;
+  }
+
+  public String toString() {
+    return "GDISurface[config "+config+
+                ", displayHandle 0x"+Long.toHexString(getDisplayHandle())+
+                ", windowHandle 0x"+Long.toHexString(windowHandle)+
+                ", surfaceHandle 0x"+Long.toHexString(getSurfaceHandle())+
+                ", size "+getWidth()+"x"+getHeight()+"]";
+  }
+
+}
diff --git a/src/newt/classes/jogamp/newt/WindowImpl.java b/src/newt/classes/jogamp/newt/WindowImpl.java
index 79679b7b3..b0991b748 100644
--- a/src/newt/classes/jogamp/newt/WindowImpl.java
+++ b/src/newt/classes/jogamp/newt/WindowImpl.java
@@ -463,36 +463,41 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
     //
 
     public final int lockSurface() {
-        int res = LOCK_SURFACE_NOT_READY;
         windowLock.lock();
+        int res = windowLock.getRecursionCount() == 0 ? LOCK_SURFACE_NOT_READY : LOCK_SUCCESS;
 
-        if(isNativeValid()) {
-            AbstractGraphicsDevice adevice = screen.getDisplay().getGraphicsDevice();
-            adevice.lock();
+        if ( LOCK_SURFACE_NOT_READY == res ) {
             try {
-                res = lockSurfaceImpl();
+                if( isNativeValid() ) {
+                    final AbstractGraphicsDevice adevice = config.getScreen().getDevice();
+                    adevice.lock();
+                    try {
+                        res = lockSurfaceImpl();
+                    } finally {
+                        if (LOCK_SURFACE_NOT_READY >= res) {
+                            adevice.unlock();
+                        }
+                    }
+                }
             } finally {
-                if( LOCK_SURFACE_NOT_READY == res ) {
-                    adevice.unlock();
+                if (LOCK_SURFACE_NOT_READY >= res) {
+                    windowLock.unlock();
                 }
             }
         }
-        if( LOCK_SURFACE_NOT_READY == res ) {
-            windowLock.unlock();
-        }
-
         return res;
     }
 
     public final void unlockSurface() {
-        // may throw RuntimeException if not locked
         windowLock.validateLocked();
-        AbstractGraphicsDevice adevice = screen.getDisplay().getGraphicsDevice();
 
-        try {
-            unlockSurfaceImpl();
-        } finally {
-            adevice.unlock();
+        if (windowLock.getRecursionCount() == 0) {
+            final AbstractGraphicsDevice adevice = config.getScreen().getDevice();
+            try {
+                unlockSurfaceImpl();
+            } finally {
+                adevice.unlock();
+            }
         }
         windowLock.unlock();
     }
diff --git a/src/newt/classes/jogamp/newt/windows/WindowsWindow.java b/src/newt/classes/jogamp/newt/windows/WindowsWindow.java
index d820be529..05d169c5e 100644
--- a/src/newt/classes/jogamp/newt/windows/WindowsWindow.java
+++ b/src/newt/classes/jogamp/newt/windows/WindowsWindow.java
@@ -56,18 +56,20 @@ public class WindowsWindow extends WindowImpl {
     }
 
     protected int lockSurfaceImpl() {
-        if( 0 != getWindowHandle() && 0 == hdc ) {
-            hdc = GDI.GetDC(getWindowHandle());
-            hmon = MonitorFromWindow0(getWindowHandle());
+        if (0 != hdc) {
+            throw new InternalError("surface not released");
         }
+        hdc = GDI.GetDC(getWindowHandle());
+        hmon = MonitorFromWindow0(getWindowHandle());
         return ( 0 != hdc ) ? LOCK_SUCCESS : LOCK_SURFACE_NOT_READY;
     }
 
     protected void unlockSurfaceImpl() {
-        if ( 0 != hdc && 0 != getWindowHandle() && getWindowLockRecursionCount() == 0) {
-            GDI.ReleaseDC(getWindowHandle(), hdc);
-            hdc=0;
+        if (0 == hdc) {
+            throw new InternalError("surface not acquired");
         }
+        GDI.ReleaseDC(getWindowHandle(), hdc);
+        hdc=0;
     }
 
     public final long getSurfaceHandle() {