From 006e9fe402a0a47b45fd2c4af51296aef895e8b5 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Sun, 4 Mar 2012 23:09:11 +0100
Subject: NEWT/Windows lockSurfaceImpl(): Detect hdc change and result w/
 LOCK_SURFACE_CHANGED

This allows an underlying delegation/mapping to update the handles, eg.: EGLDrawable.

See commit  a0177c8a1048683e5d43f4712f8f9e37091d4e85
---
 .../jogamp/newt/driver/windows/WindowsWindow.java  | 23 ++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/src/newt/classes/jogamp/newt/driver/windows/WindowsWindow.java b/src/newt/classes/jogamp/newt/driver/windows/WindowsWindow.java
index d14c47f5a..588e26eb7 100644
--- a/src/newt/classes/jogamp/newt/driver/windows/WindowsWindow.java
+++ b/src/newt/classes/jogamp/newt/driver/windows/WindowsWindow.java
@@ -53,6 +53,7 @@ public class WindowsWindow extends WindowImpl {
 
     private long hmon;
     private long hdc;
+    private long hdc_old;
     private long windowHandleClose;
 
     static {
@@ -69,7 +70,19 @@ public class WindowsWindow extends WindowImpl {
         }
         hdc = GDI.GetDC(getWindowHandle());
         hmon = MonitorFromWindow0(getWindowHandle());
-        return ( 0 != hdc ) ? LOCK_SUCCESS : LOCK_SURFACE_NOT_READY;
+        
+        // return ( 0 == hdc ) ? LOCK_SURFACE_NOT_READY : ( hdc_old != hdc ) ? LOCK_SURFACE_CHANGED : LOCK_SUCCESS ;
+        if( 0 == hdc ) { 
+            return LOCK_SURFACE_NOT_READY;
+        }
+        if( hdc_old == hdc ) {
+            return LOCK_SUCCESS;
+        }
+        if(DEBUG_IMPLEMENTATION) {            
+            System.err.println("********** HDC change "+toHexString(hdc_old)+" -> "+toHexString(hdc));
+            // Thread.dumpStack();
+        }
+        return LOCK_SURFACE_CHANGED;        
     }
 
     @Override
@@ -78,6 +91,7 @@ public class WindowsWindow extends WindowImpl {
             throw new InternalError("surface not acquired");
         }
         GDI.ReleaseDC(getWindowHandle(), hdc);
+        hdc_old = hdc;
         hdc=0;
     }
 
@@ -92,9 +106,9 @@ public class WindowsWindow extends WindowImpl {
             long _hmon = MonitorFromWindow0(getWindowHandle());
             if (hmon != _hmon) {
                 if(DEBUG_IMPLEMENTATION) {
-                    Exception e = new Exception("Info: Window Device Changed "+Thread.currentThread().getName()+
-                                                ", HMON "+toHexString(hmon)+" -> "+toHexString(_hmon));
-                    e.printStackTrace();
+                    System.err.println("Info: Window Device Changed "+Thread.currentThread().getName()+
+                                        ", HMON "+toHexString(hmon)+" -> "+toHexString(_hmon));
+                    // Thread.dumpStack();
                 }
                 hmon = _hmon;
                 return true;
@@ -149,6 +163,7 @@ public class WindowsWindow extends WindowImpl {
                 }
             }
             hdc = 0;
+            hdc_old = 0;
         }
         if(windowHandleClose != 0) {
             try {
-- 
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