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diff --git a/khtml/rendering/render_layer.h b/khtml/rendering/render_layer.h
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+/*
+ * Copyright (C) 2003 Apple Computer, Inc.
+ *
+ * Portions are Copyright (C) 1998 Netscape Communications Corporation.
+ *
+ * Other contributors:
+ *   Robert O'Callahan <roc+@cs.cmu.edu>
+ *   David Baron <dbaron@fas.harvard.edu>
+ *   Christian Biesinger <cbiesinger@web.de>
+ *   Randall Jesup <rjesup@wgate.com>
+ *   Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
+ *   Josh Soref <timeless@mac.com>
+ *   Boris Zbarsky <bzbarsky@mit.edu>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Alternatively, the contents of this file may be used under the terms
+ * of either the Mozilla Public License Version 1.1, found at
+ * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
+ * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
+ * (the "GPL"), in which case the provisions of the MPL or the GPL are
+ * applicable instead of those above.  If you wish to allow use of your
+ * version of this file only under the terms of one of those two
+ * licenses (the MPL or the GPL) and not to allow others to use your
+ * version of this file under the LGPL, indicate your decision by
+ * deletingthe provisions above and replace them with the notice and
+ * other provisions required by the MPL or the GPL, as the case may be.
+ * If you do not delete the provisions above, a recipient may use your
+ * version of this file under any of the LGPL, the MPL or the GPL.
+ */
+
+#ifndef render_layer_h
+#define render_layer_h
+
+#include <qcolor.h>
+#include <qrect.h>
+#include <assert.h>
+
+#include "render_object.h"
+
+class QScrollBar;
+template <class T> class QPtrVector;
+
+namespace khtml {
+    class RenderStyle;
+    class RenderTable;
+    class CachedObject;
+    class RenderCanvas;
+    class RenderText;
+    class RenderFrameSet;
+    class RenderObject;
+    class RenderScrollMediator;
+
+class RenderScrollMediator: public QObject
+{
+    Q_OBJECT
+public:
+    RenderScrollMediator(RenderLayer* layer)
+    :m_layer(layer) {}
+
+public slots:
+    void slotValueChanged();
+
+private:
+    RenderLayer* m_layer;
+};
+
+// This class handles the auto-scrolling of layers with overflow: marquee.
+class Marquee: public QObject
+{
+    Q_OBJECT
+
+public:
+    Marquee(RenderLayer* l);
+
+    void timerEvent(QTimerEvent*);
+
+    int speed() const { return m_speed; }
+    int marqueeSpeed() const;
+    EMarqueeDirection direction() const;
+    EMarqueeDirection reverseDirection() const { return static_cast<EMarqueeDirection>(-direction()); }
+    bool isHorizontal() const;
+    bool isUnfurlMarquee() const;
+    int unfurlPos() const { return m_unfurlPos; }
+
+    EWhiteSpace whiteSpace() { return m_whiteSpace; }
+
+    int computePosition(EMarqueeDirection dir, bool stopAtClientEdge);
+
+    void setEnd(int end) { m_end = end; }
+
+    void start();
+    void suspend();
+    void stop();
+
+    void updateMarqueeStyle();
+    void updateMarqueePosition();
+
+private:
+    RenderLayer* m_layer;
+    int m_currentLoop;
+    int m_totalLoops;
+    int m_timerId;
+    int m_start;
+    int m_end;
+    int m_speed;
+    int m_unfurlPos;
+    bool m_reset:1;
+    bool m_suspended:1;
+    bool m_stopped:1;
+    EWhiteSpace m_whiteSpace : 3;
+    EMarqueeDirection m_direction : 4;
+};
+
+class RenderLayer
+{
+public:
+#ifdef APPLE_CHANGES
+    static QScrollBar* gScrollBar;
+#endif
+
+    RenderLayer(RenderObject* object);
+    ~RenderLayer();
+
+    RenderObject* renderer() const { return m_object; }
+    RenderLayer *parent() const { return m_parent; }
+    RenderLayer *previousSibling() const { return m_previous; }
+    RenderLayer *nextSibling() const { return m_next; }
+
+    RenderLayer *firstChild() const { return m_first; }
+    RenderLayer *lastChild() const { return m_last; }
+
+    void addChild(RenderLayer *newChild, RenderLayer* beforeChild = 0);
+    RenderLayer* removeChild(RenderLayer *oldChild);
+
+    void removeOnlyThisLayer();
+    void insertOnlyThisLayer();
+
+    void styleChanged();
+
+    Marquee* marquee() const { return m_marquee; }
+    void suspendMarquees();
+
+    bool isOverflowOnly() const { return m_isOverflowOnly; }
+
+#ifdef APPLE_CHANGES
+    bool isTransparent();
+    RenderLayer* transparentAncestor();
+#endif
+
+    RenderLayer* root() {
+        RenderLayer* curr = this;
+        while (curr->parent()) curr = curr->parent();
+        return curr;
+    }
+
+    int xPos() const { return m_x; }
+    int yPos() const { return m_y; }
+
+    short width() const;
+    int height() const;
+
+    short scrollWidth() const { return m_scrollWidth; }
+    int scrollHeight() const { return m_scrollHeight; }
+
+    void resize( int w, int h ) {
+        m_scrollWidth = w; m_scrollHeight = h;
+    }
+
+    void setPos( int xPos, int yPos ) {
+        m_x = xPos;
+        m_y = yPos;
+    }
+
+    // Scrolling methods for layers that can scroll their overflow.
+    void scrollOffset(int& x, int& y);
+    void subtractScrollOffset(int& x, int& y);
+    void checkInlineRelOffset(const RenderObject* o, int& x, int& y);
+    short scrollXOffset() { return m_scrollX; }
+    int scrollYOffset() { return m_scrollY; }
+    void scrollToOffset(int x, int y, bool updateScrollbars = true, bool repaint = true);
+    void scrollToXOffset(int x) { scrollToOffset(x, m_scrollY); }
+    void scrollToYOffset(int y) { scrollToOffset(m_scrollX, y); }
+    void showScrollbar(Qt::Orientation, bool);
+    QScrollBar* horizontalScrollbar() { return m_hBar; }
+    QScrollBar* verticalScrollbar() { return m_vBar; }
+    int verticalScrollbarWidth();
+    int horizontalScrollbarHeight();
+    void positionScrollbars(const QRect &damageRect);
+    void paintScrollbars(RenderObject::PaintInfo& pI);
+    void checkScrollbarsAfterLayout();
+    void slotValueChanged(int);
+    void repaint(Priority p=NormalPriority, bool markForRepaint = false);
+    void updateScrollPositionFromScrollbars();
+
+    void updateLayerPosition();
+    void updateLayerPositions( RenderLayer* rootLayer, bool doFullRepaint = false, bool checkForRepaint = false);
+
+    // Get the enclosing stacking context for this layer.  A stacking context is a layer
+    // that has a non-auto z-index.
+    RenderLayer* stackingContext() const;
+    bool isStackingContext() const { return !hasAutoZIndex() || renderer()->isCanvas(); }
+
+    void dirtyZOrderLists();
+    void updateZOrderLists();
+    QPtrVector<RenderLayer>* posZOrderList() const { return m_posZOrderList; }
+    QPtrVector<RenderLayer>* negZOrderList() const { return m_negZOrderList; }
+
+    void dirtyOverflowList();
+    void updateOverflowList();
+    QValueList<RenderLayer*>* overflowList() const { return m_overflowList; }
+
+    void setHasOverlaidWidgets(bool b=true) { m_hasOverlaidWidgets = b; }
+    bool hasOverlaidWidgets() const { return m_hasOverlaidWidgets; }
+    QRegion getMask() const { return m_region; }
+    QRegion paintedRegion(RenderLayer* rootLayer);
+    void updateWidgetMasks(RenderLayer* rootLayer);
+
+    // Gets the nearest enclosing positioned ancestor layer (also includes
+    // the <html> layer and the root layer).
+    RenderLayer* enclosingPositionedAncestor() const;
+
+    void convertToLayerCoords(const RenderLayer* ancestorLayer, int& x, int& y) const;
+
+    bool hasAutoZIndex() const { return renderer()->style()->hasAutoZIndex(); }
+    int zIndex() const { return renderer()->style()->zIndex(); }
+
+    // The two main functions that use the layer system.  The paint method
+    // paints the layers that intersect the damage rect from back to
+    // front.  The nodeAtPoint method looks for mouse events by walking
+    // layers that intersect the point from front to back.
+    KDE_EXPORT void paint(QPainter *p, const QRect& damageRect, bool selectionOnly=false);
+    bool nodeAtPoint(RenderObject::NodeInfo& info, int x, int y);
+
+    // This method figures out our layerBounds in coordinates relative to
+    // |rootLayer}.  It also computes our background and foreground clip rects
+    // for painting/event handling.
+    void calculateRects(const RenderLayer* rootLayer, const QRect& paintDirtyRect, QRect& layerBounds,
+                        QRect& backgroundRect, QRect& foregroundRect);
+    void calculateClipRects(const RenderLayer* rootLayer, QRect& overflowClipRect,
+                            QRect& posClipRect, QRect& fixedClipRect);
+
+    bool intersectsDamageRect(const QRect& layerBounds, const QRect& damageRect) const;
+    bool containsPoint(int x, int y, const QRect& damageRect) const;
+
+    void updateHoverActiveState(RenderObject::NodeInfo& info);
+
+    void detach(RenderArena* renderArena);
+
+#ifdef ENABLE_DUMP
+    KDE_EXPORT void dump(QTextStream &stream, const QString &ind = QString::null);
+#endif
+
+     // Overloaded new operator.  Derived classes must override operator new
+    // in order to allocate out of the RenderArena.
+    void* operator new(size_t sz, RenderArena* renderArena) throw();
+
+    // Overridden to prevent the normal delete from being called.
+    void operator delete(void* ptr, size_t sz);
+
+private:
+    // The normal operator new is disallowed on all render objects.
+    void* operator new(size_t sz) throw();
+
+private:
+    void setNextSibling(RenderLayer* next) { m_next = next; }
+    void setPreviousSibling(RenderLayer* prev) { m_previous = prev; }
+    void setParent(RenderLayer* parent) { m_parent = parent; }
+    void setFirstChild(RenderLayer* first) { m_first = first; }
+    void setLastChild(RenderLayer* last) { m_last = last; }
+
+    void collectLayers(QPtrVector<RenderLayer>*&, QPtrVector<RenderLayer>*&);
+
+    KDE_EXPORT void paintLayer(RenderLayer* rootLayer, QPainter *p, const QRect& paintDirtyRect, bool selectionOnly=false);
+    RenderLayer* nodeAtPointForLayer(RenderLayer* rootLayer, RenderObject::NodeInfo& info,
+                                     int x, int y, const QRect& hitTestRect);
+    bool shouldBeOverflowOnly() const;
+
+protected:
+    RenderObject* m_object;
+
+    RenderLayer* m_parent;
+    RenderLayer* m_previous;
+    RenderLayer* m_next;
+
+    RenderLayer* m_first;
+    RenderLayer* m_last;
+
+    // Our (x,y) coordinates are in our parent layer's coordinate space.
+    short m_x;
+    int m_y;
+
+    // Our scroll offsets if the view is scrolled.
+    short m_scrollX;
+    int m_scrollY;
+
+    // The width/height of our scrolled area.
+    short m_scrollWidth;
+    int m_scrollHeight;
+
+    // For layers with overflow, we have a pair of scrollbars.
+    QScrollBar* m_hBar;
+    QScrollBar* m_vBar;
+    RenderScrollMediator* m_scrollMediator;
+
+    // For layers that establish stacking contexts, m_posZOrderList holds a sorted list of all the
+    // descendant layers within the stacking context that have z-indices of 0 or greater
+    // (auto will count as 0).  m_negZOrderList holds descendants within our stacking context with negative
+    // z-indices.
+    QPtrVector<RenderLayer>* m_posZOrderList;
+    QPtrVector<RenderLayer>* m_negZOrderList;
+    
+    // This list contains our overflow child layers.
+    QValueList<RenderLayer*>* m_overflowList;
+   
+    bool m_zOrderListsDirty: 1;
+    bool m_overflowListDirty: 1;
+    bool m_isOverflowOnly: 1;
+    bool m_markedForRepaint: 1;
+    bool m_hasOverlaidWidgets: 1; 
+
+    QRect m_visibleRect;
+
+    QRegion m_region; // used by overlaid (non z-order aware) widgets
+
+    Marquee* m_marquee; // Used by layers with overflow:marquee
+};
+
+} // namespace
+#endif