1 /* 2 * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved. 3 * Copyright (C) 2013 Intel Corporation. All rights reserved. 4 * 5 * Portions are Copyright (C) 1998 Netscape Communications Corporation. 6 * 7 * Other contributors: 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> 15 * 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. 20 * 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. 25 * 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 29 * 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 33 * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html 34 * (the "GPL"), in which case the provisions of the MPL or the GPL are 35 * applicable instead of those above. If you wish to allow use of your 36 * version of this file only under the terms of one of those two 37 * licenses (the MPL or the GPL) and not to allow others to use your 38 * version of this file under the LGPL, indicate your decision by 39 * deletingthe provisions above and replace them with the notice and 40 * other provisions required by the MPL or the GPL, as the case may be. 41 * If you do not delete the provisions above, a recipient may use your 42 * version of this file under any of the LGPL, the MPL or the GPL. 43 */ 44 45 #ifndef RenderLayerClipper_h 46 #define RenderLayerClipper_h 47 48 #include "core/rendering/ClipRect.h" 49 #include "core/rendering/RenderBox.h" // For OverlayScrollbarSizeRelevancy. 50 51 namespace WebCore { 52 53 class RenderLayer; 54 class RenderRegion; 55 56 struct ClipRectsContext { 57 ClipRectsContext(const RenderLayer* inRootLayer, RenderRegion* inRegion, ClipRectsType inClipRectsType, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, ShouldRespectOverflowClip inRespectOverflowClip = RespectOverflowClip) rootLayerClipRectsContext58 : rootLayer(inRootLayer) 59 , region(inRegion) 60 , clipRectsType(inClipRectsType) 61 , overlayScrollbarSizeRelevancy(inOverlayScrollbarSizeRelevancy) 62 , respectOverflowClip(inRespectOverflowClip) 63 { } 64 const RenderLayer* rootLayer; 65 RenderRegion* region; 66 ClipRectsType clipRectsType; 67 OverlayScrollbarSizeRelevancy overlayScrollbarSizeRelevancy; 68 ShouldRespectOverflowClip respectOverflowClip; 69 }; 70 71 class RenderLayerClipper { 72 WTF_MAKE_NONCOPYABLE(RenderLayerClipper); 73 public: RenderLayerClipper(RenderLayerModelObject * renderer)74 RenderLayerClipper(RenderLayerModelObject* renderer) 75 : m_renderer(renderer) 76 { 77 } 78 clipRects(const ClipRectsContext & context)79 ClipRects* clipRects(const ClipRectsContext& context) const 80 { 81 ASSERT(context.clipRectsType < NumCachedClipRectsTypes); 82 return m_clipRectsCache ? m_clipRectsCache->getClipRects(context.clipRectsType, context.respectOverflowClip).get() : 0; 83 } 84 85 // Compute and cache clip rects computed with the given layer as the root 86 void updateClipRects(const ClipRectsContext&); 87 88 void clearClipRectsIncludingDescendants(ClipRectsType typeToClear = AllClipRectTypes); 89 void clearClipRects(ClipRectsType typeToClear = AllClipRectTypes); 90 91 // Compute and return the clip rects. If useCached is true, will used previously computed clip rects on ancestors 92 // (rather than computing them all from scratch up the parent chain). 93 void calculateClipRects(const ClipRectsContext&, ClipRects&) const; 94 95 private: 96 // FIXME: Could this be a RenderBox? 97 RenderLayerModelObject* m_renderer; 98 99 OwnPtr<ClipRectsCache> m_clipRectsCache; 100 }; 101 102 } // namespace WebCore 103 104 #endif // RenderLayerClipper_h 105