Bug 682077 - Backout of 332d4787b430 to troubleshoot crashes on Windows.

layout/xul/base/src/tree/src/nsITreeImageListener.h

@@ -0,0 +1,64 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Dave Hyatt <hyatt@mozilla.org> (Original Author)
+ *   Jan Varga <varga@ku.sk>
+ *   Scott Johnson <sjohnson@mozilla.com>, Mozilla Corporation
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsITreeImageListener_h__
+#define nsITreeImageListener_h__
+
+// The interface for our image listener.
+// {90586540-2D50-403e-8DCE-981CAA778444}
+#define NS_ITREEIMAGELISTENER_IID \
+{ 0x90586540, 0x2d50, 0x403e, { 0x8d, 0xce, 0x98, 0x1c, 0xaa, 0x77, 0x84, 0x44 } }
+
+class nsITreeImageListener : public nsISupports
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ITREEIMAGELISTENER_IID)
+
+  NS_IMETHOD AddCell(PRInt32 aIndex, nsITreeColumn* aCol) = 0;
+
+  /**
+   * Clear the internal frame pointer to prevent dereferencing an object
+   * that no longer exists.
+   */
+  NS_IMETHOD ClearFrame() = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsITreeImageListener, NS_ITREEIMAGELISTENER_IID)
+
+#endif

layout/xul/base/src/tree/src/nsTreeBodyFrame.cpp

@@ -2157,11 +2157,9 @@ nsTreeBodyFrame::GetImage(PRInt32 aRowIndex, nsTreeColumn* aCol, bool aUseContex
       // We either aren't done loading, or we're animating. Add our row as a listener for invalidations.
       nsCOMPtr<imgIDecoderObserver> obs;
       imgReq->GetDecoderObserver(getter_AddRefs(obs));
-
-      if (obs) {
-        static_cast<nsTreeImageListener*> (obs.get())->AddCell(aRowIndex, aCol);
-      }
-
+      nsCOMPtr<nsITreeImageListener> listener(do_QueryInterface(obs));
+      if (listener)
+        listener->AddCell(aRowIndex, aCol);
       return NS_OK;
     }
   }

layout/xul/base/src/tree/src/nsTreeBodyFrame.h

@@ -63,6 +63,7 @@
 #include "nsScrollbarFrame.h"
 #include "nsThreadUtils.h"
 #include "mozilla/LookAndFeel.h"
+#include "nsITreeImageListener.h"
 
 class nsOverflowChecker;
 class nsTreeImageListener;

layout/xul/base/src/tree/src/nsTreeImageListener.cpp

@@ -42,7 +42,7 @@
 #include "imgIRequest.h"
 #include "imgIContainer.h"
 
-NS_IMPL_ISUPPORTS2(nsTreeImageListener, imgIDecoderObserver, imgIContainerObserver)
+NS_IMPL_ISUPPORTS3(nsTreeImageListener, imgIDecoderObserver, imgIContainerObserver, nsITreeImageListener)
 
 nsTreeImageListener::nsTreeImageListener(nsTreeBodyFrame* aTreeFrame)
   : mTreeFrame(aTreeFrame),
@@ -92,7 +92,7 @@ NS_IMETHODIMP nsTreeImageListener::FrameChanged(imgIContainer *aContainer,
 }
 
 
-void
+NS_IMETHODIMP
 nsTreeImageListener::AddCell(PRInt32 aIndex, nsITreeColumn* aCol)
 {
   if (!mInvalidationArea) {
@@ -114,6 +114,8 @@ nsTreeImageListener::AddCell(PRInt32 aIndex, nsITreeColumn* aCol)
       mInvalidationArea->AddRow(aIndex);
     }
   }
+
+  return NS_OK;
 }
 
 

layout/xul/base/src/tree/src/nsTreeImageListener.h

@@ -45,9 +45,10 @@
 #include "nsITreeColumns.h"
 #include "nsStubImageDecoderObserver.h"
 #include "nsTreeBodyFrame.h"
+#include "nsITreeImageListener.h"
 
 // This class handles image load observation.
-class nsTreeImageListener : public nsStubImageDecoderObserver
+class nsTreeImageListener : public nsStubImageDecoderObserver, public nsITreeImageListener
 {
 public:
   nsTreeImageListener(nsTreeBodyFrame *aTreeFrame);
@@ -63,6 +64,7 @@ public:
   NS_IMETHOD FrameChanged(imgIContainer *aContainer,
                           const nsIntRect *aDirtyRect);
 
+  NS_IMETHOD AddCell(PRInt32 aIndex, nsITreeColumn* aCol);
   NS_IMETHOD ClearFrame();
 
   friend class nsTreeBodyFrame;
@@ -70,7 +72,6 @@ public:
 protected:
   void UnsuppressInvalidation() { mInvalidationSuppressed = false; }
   void Invalidate();
-  void AddCell(PRInt32 aIndex, nsITreeColumn* aCol);
 
 private:
   nsTreeBodyFrame* mTreeFrame;