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* Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
* Copyright (C) 2013 Intel Corporation. All rights reserved.
* Portions are Copyright (C) 1998 Netscape Communications Corporation.
* Other contributors:
* Robert O'Callahan <>
* David Baron <>
* Christian Biesinger <>
* Randall Jesup <>
* Roland Mainz <>
* Josh Soref <>
* Boris Zbarsky <>
* 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
* 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
* (the "MPL") or the GNU General Public
* License Version 2.0, found at
* (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 RenderLayerClipper_h
#define RenderLayerClipper_h
#include "core/rendering/ClipRect.h"
#include "core/rendering/RenderBox.h" // For OverlayScrollbarSizeRelevancy.
namespace WebCore {
class RenderLayer;
class RenderRegion;
struct ClipRectsContext {
ClipRectsContext(const RenderLayer* inRootLayer, RenderRegion* inRegion, ClipRectsType inClipRectsType, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, ShouldRespectOverflowClip inRespectOverflowClip = RespectOverflowClip)
: rootLayer(inRootLayer)
, region(inRegion)
, clipRectsType(inClipRectsType)
, overlayScrollbarSizeRelevancy(inOverlayScrollbarSizeRelevancy)
, respectOverflowClip(inRespectOverflowClip)
{ }
const RenderLayer* rootLayer;
RenderRegion* region;
ClipRectsType clipRectsType;
OverlayScrollbarSizeRelevancy overlayScrollbarSizeRelevancy;
ShouldRespectOverflowClip respectOverflowClip;
class RenderLayerClipper {
RenderLayerClipper(RenderLayerModelObject* renderer)
: m_renderer(renderer)
ClipRects* clipRects(const ClipRectsContext& context) const
ASSERT(context.clipRectsType < NumCachedClipRectsTypes);
return m_clipRectsCache ? m_clipRectsCache->getClipRects(context.clipRectsType, context.respectOverflowClip).get() : 0;
// Compute and cache clip rects computed with the given layer as the root
void updateClipRects(const ClipRectsContext&);
void clearClipRectsIncludingDescendants(ClipRectsType typeToClear = AllClipRectTypes);
void clearClipRects(ClipRectsType typeToClear = AllClipRectTypes);
// Compute and return the clip rects. If useCached is true, will used previously computed clip rects on ancestors
// (rather than computing them all from scratch up the parent chain).
void calculateClipRects(const ClipRectsContext&, ClipRects&) const;
// FIXME: Could this be a RenderBox?
RenderLayerModelObject* m_renderer;
OwnPtr<ClipRectsCache> m_clipRectsCache;
} // namespace WebCore
#endif // RenderLayerClipper_h