2 * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
3 * Copyright (C) 2013 Intel Corporation. All rights reserved.
5 * Portions are Copyright (C) 1998 Netscape Communications Corporation.
8 * Robert O'Callahan <roc+@cs.cmu.edu>
9 * David Baron <dbaron@fas.harvard.edu>
10 * Christian Biesinger <cbiesinger@web.de>
11 * Randall Jesup <rjesup@wgate.com>
12 * Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
13 * Josh Soref <timeless@mac.com>
14 * Boris Zbarsky <bzbarsky@mit.edu>
16 * This library is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU Lesser General Public
18 * License as published by the Free Software Foundation; either
19 * version 2.1 of the License, or (at your option) any later version.
21 * This library is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 * Lesser General Public License for more details.
26 * You should have received a copy of the GNU Lesser General Public
27 * License along with this library; if not, write to the Free Software
28 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 * Alternatively, the contents of this file may be used under the terms
31 * of either the Mozilla Public License Version 1.1, found at
32 * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
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45 #ifndef RenderLayerClipper_h
46 #define RenderLayerClipper_h
48 #include "core/rendering/ClipRect.h"
49 #include "core/rendering/RenderBox.h" // For OverlayScrollbarSizeRelevancy.
55 struct ClipRectsContext {
56 ClipRectsContext(const RenderLayer* inRootLayer, ClipRectsType inClipRectsType, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, ShouldRespectOverflowClip inRespectOverflowClip = RespectOverflowClip, const LayoutSize& inSubPixelAccumulation = LayoutSize())
57 : rootLayer(inRootLayer)
58 , clipRectsType(inClipRectsType)
59 , overlayScrollbarSizeRelevancy(inOverlayScrollbarSizeRelevancy)
60 , respectOverflowClip(inRespectOverflowClip)
61 , subPixelAccumulation(inSubPixelAccumulation)
63 const RenderLayer* rootLayer;
64 ClipRectsType clipRectsType;
65 OverlayScrollbarSizeRelevancy overlayScrollbarSizeRelevancy;
66 ShouldRespectOverflowClip respectOverflowClip;
67 LayoutSize subPixelAccumulation;
70 class RenderLayerClipper FINAL {
71 WTF_MAKE_NONCOPYABLE(RenderLayerClipper);
73 explicit RenderLayerClipper(RenderLayerModelObject& renderer)
74 : m_renderer(renderer)
75 , m_compositingClipRectsDirty(false)
79 ClipRects* clipRects(const ClipRectsContext& context) const
81 ASSERT(context.clipRectsType < NumCachedClipRectsTypes);
82 return m_clipRectsCache ? m_clipRectsCache->getClipRects(context.clipRectsType, context.respectOverflowClip).get() : 0;
85 // Compute and cache clip rects computed with the given layer as the root
86 void updateClipRects(const ClipRectsContext&);
88 void clearClipRectsIncludingDescendants(ClipRectsType typeToClear = AllClipRectTypes);
89 void clearClipRects(ClipRectsType typeToClear = AllClipRectTypes);
91 void setCompositingClipRectsDirty();
93 LayoutRect childrenClipRect() const; // Returns the foreground clip rect of the layer in the document's coordinate space.
94 LayoutRect localClipRect() const; // Returns the background clip rect of the layer in the local coordinate space.
96 ClipRect backgroundClipRect(const ClipRectsContext&) const;
98 // FIXME: The following functions should be private.
100 // This method figures out our layerBounds in coordinates relative to
101 // |rootLayer}. It also computes our background and foreground clip rects
102 // for painting/event handling.
103 // Pass offsetFromRoot if known.
104 void calculateRects(const ClipRectsContext&, const LayoutRect& paintDirtyRect, LayoutRect& layerBounds,
105 ClipRect& backgroundRect, ClipRect& foregroundRect, ClipRect& outlineRect, const LayoutPoint* offsetFromRoot = 0) const;
107 // Compute and return the clip rects. If useCached is true, will used previously computed clip rects on ancestors
108 // (rather than computing them all from scratch up the parent chain).
109 void calculateClipRects(const ClipRectsContext&, ClipRects&) const;
112 void parentClipRects(const ClipRectsContext&, ClipRects&) const;
114 // The layer relative to which clipping rects for this layer are computed.
115 RenderLayer* clippingRootForPainting() const;
117 bool isClippingRootForContext(const ClipRectsContext&) const;
119 // FIXME: Could this be a RenderBox?
120 RenderLayerModelObject& m_renderer;
121 OwnPtr<ClipRectsCache> m_clipRectsCache;
122 unsigned m_compositingClipRectsDirty : 1;
125 } // namespace WebCore
127 #endif // RenderLayerClipper_h