--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/rendering/RenderFrameBase.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2010 Apple Inc. 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 APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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. 
+ */
+
+#include "config.h"
+#include "RenderFrameBase.h"
+
+#include "FrameView.h"
+#include "HTMLFrameElementBase.h"
+#include "RenderView.h"
+
+namespace WebCore {
+    
+RenderFrameBase::RenderFrameBase(Element* element)
+    : RenderPart(element)
+{
+}
+
+void RenderFrameBase::layoutWithFlattening(bool fixedWidth, bool fixedHeight)
+{
+    FrameView* childFrameView = static_cast<FrameView*>(widget());
+    RenderView* childRoot = childFrameView ? static_cast<RenderView*>(childFrameView->frame()->contentRenderer()) : 0;
+
+    // Do not expand frames which has zero width or height
+    if (!width() || !height() || !childRoot) {
+        updateWidgetPosition();
+        if (childFrameView)
+            childFrameView->layout();
+        setNeedsLayout(false);
+        return;
+    }
+
+    // need to update to calculate min/max correctly
+    updateWidgetPosition();
+    if (childRoot->prefWidthsDirty())
+        childRoot->calcPrefWidths();
+
+    // if scrollbars are off, and the width or height are fixed
+    // we obey them and do not expand. With frame flattening
+    // no subframe much ever become scrollable.
+
+    HTMLFrameElementBase* element = static_cast<HTMLFrameElementBase*>(node());
+    bool isScrollable = element->scrollingMode() != ScrollbarAlwaysOff;
+
+    // consider iframe inset border
+    int hBorder = borderLeft() + borderRight();
+    int vBorder = borderTop() + borderBottom();
+
+    // make sure minimum preferred width is enforced
+    if (isScrollable || !fixedWidth) {
+        setWidth(max(width(), childRoot->minPrefWidth() + hBorder));
+        // update again to pass the new width to the child frame
+        updateWidgetPosition();
+        childFrameView->layout();
+    }
+
+    // expand the frame by setting frame height = content height
+    if (isScrollable || !fixedHeight || childRoot->isFrameSet())
+        setHeight(max(height(), childFrameView->contentsHeight() + vBorder));
+    if (isScrollable || !fixedWidth || childRoot->isFrameSet())
+        setWidth(max(width(), childFrameView->contentsWidth() + hBorder));
+
+    updateWidgetPosition();
+
+    ASSERT(!childFrameView->layoutPending());
+    ASSERT(!childRoot->needsLayout());
+    ASSERT(!childRoot->firstChild() || !childRoot->firstChild()->firstChild() || !childRoot->firstChild()->firstChild()->needsLayout());
+
+    setNeedsLayout(false);
+}
+
+}