diff -r 000000000000 -r 6474c204b198 layout/printing/nsPrintObject.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/printing/nsPrintObject.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,110 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsPrintObject.h"
+#include "nsIContentViewer.h"
+#include "nsIDOMDocument.h"
+#include "nsContentUtils.h" // for nsAutoScriptBlocker
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsPIDOMWindow.h"
+#include "nsGkAtoms.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIDocShellTreeItem.h"
+#include "nsIBaseWindow.h"
+#include "nsIDocument.h"
+
+//---------------------------------------------------
+//-- nsPrintObject Class Impl
+//---------------------------------------------------
+nsPrintObject::nsPrintObject() :
+  mContent(nullptr), mFrameType(eFrame), mParent(nullptr),
+  mHasBeenPrinted(false), mDontPrint(true), mPrintAsIs(false),
+  mInvisible(false), mDidCreateDocShell(false),
+  mShrinkRatio(1.0), mZoomRatio(1.0)
+{
+  MOZ_COUNT_CTOR(nsPrintObject);
+}
+
+
+nsPrintObject::~nsPrintObject()
+{
+  MOZ_COUNT_DTOR(nsPrintObject);
+  for (uint32_t i=0;i<mKids.Length();i++) {
+    nsPrintObject* po = mKids[i];
+    delete po;
+  }
+
+  DestroyPresentation();
+  if (mDidCreateDocShell && mDocShell) {
+    nsCOMPtr<nsIBaseWindow> baseWin(do_QueryInterface(mDocShell));
+    if (baseWin) {
+      baseWin->Destroy();
+    }
+  }                            
+  mDocShell = nullptr;
+  mTreeOwner = nullptr; // mTreeOwner must be released after mDocShell; 
+}
+
+//------------------------------------------------------------------
+nsresult 
+nsPrintObject::Init(nsIDocShell* aDocShell, nsIDOMDocument* aDoc,
+                    bool aPrintPreview)
+{
+  mPrintPreview = aPrintPreview;
+
+  if (mPrintPreview || mParent) {
+    mDocShell = aDocShell;
+  } else {
+    mTreeOwner = do_GetInterface(aDocShell);
+    // Create a container docshell for printing.
+    mDocShell = do_CreateInstance("@mozilla.org/docshell;1");
+    NS_ENSURE_TRUE(mDocShell, NS_ERROR_OUT_OF_MEMORY);
+    mDidCreateDocShell = true;
+    mDocShell->SetItemType(aDocShell->ItemType());
+    mDocShell->SetTreeOwner(mTreeOwner);
+  }
+  NS_ENSURE_TRUE(mDocShell, NS_ERROR_FAILURE);
+
+  nsCOMPtr<nsIDOMDocument> dummy = do_GetInterface(mDocShell);
+  nsCOMPtr<nsIContentViewer> viewer;
+  mDocShell->GetContentViewer(getter_AddRefs(viewer));
+  NS_ENSURE_STATE(viewer);
+
+  nsCOMPtr<nsIDocument> doc = do_QueryInterface(aDoc);
+  NS_ENSURE_STATE(doc);
+
+  if (mParent) {
+    nsCOMPtr<nsPIDOMWindow> window = doc->GetWindow();
+    if (window) {
+      mContent = do_QueryInterface(window->GetFrameElementInternal());
+    }
+    mDocument = doc;
+    return NS_OK;
+  }
+
+  mDocument = doc->CreateStaticClone(mDocShell);
+  nsCOMPtr<nsIDOMDocument> clonedDOMDoc = do_QueryInterface(mDocument);
+  NS_ENSURE_STATE(clonedDOMDoc);
+
+  viewer->SetDOMDocument(clonedDOMDoc);
+  return NS_OK;
+}
+
+//------------------------------------------------------------------
+// Resets PO by destroying the presentation
+void 
+nsPrintObject::DestroyPresentation()
+{
+  if (mPresShell) {
+    mPresShell->EndObservingDocument();
+    nsAutoScriptBlocker scriptBlocker;
+    nsCOMPtr<nsIPresShell> shell = mPresShell;
+    mPresShell = nullptr;
+    shell->Destroy();
+  }
+  mPresContext = nullptr;
+  mViewManager = nullptr;
+}
+