/* * 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 <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 RenderLayerClipper_h #define RenderLayerClipper_h #include "core/rendering/ClipRect.h" #include "core/rendering/RenderBox.h" // For OverlayScrollbarSizeRelevancy. namespace WebCore { class RenderLayer; struct ClipRectsContext { ClipRectsContext(const RenderLayer* inRootLayer, ClipRectsType inClipRectsType, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, ShouldRespectOverflowClip inRespectOverflowClip = RespectOverflowClip, const LayoutSize& inSubPixelAccumulation = LayoutSize()) : rootLayer(inRootLayer) , clipRectsType(inClipRectsType) , overlayScrollbarSizeRelevancy(inOverlayScrollbarSizeRelevancy) , respectOverflowClip(inRespectOverflowClip) , subPixelAccumulation(inSubPixelAccumulation) { } const RenderLayer* rootLayer; ClipRectsType clipRectsType; OverlayScrollbarSizeRelevancy overlayScrollbarSizeRelevancy; ShouldRespectOverflowClip respectOverflowClip; LayoutSize subPixelAccumulation; }; class RenderLayerClipper FINAL { WTF_MAKE_NONCOPYABLE(RenderLayerClipper); public: explicit RenderLayerClipper(RenderLayerModelObject* renderer) : m_renderer(renderer) , m_compositingClipRectsDirty(false) { } 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); void setCompositingClipRectsDirty(); LayoutRect childrenClipRect() const; // Returns the foreground clip rect of the layer in the document's coordinate space. LayoutRect selfClipRect() const; // Returns the background clip rect of the layer in the document's coordinate space. LayoutRect localClipRect() const; // Returns the background clip rect of the layer in the local coordinate space. ClipRect backgroundClipRect(const ClipRectsContext&) const; // FIXME: The following functions should be private. // This method figures out our layerBounds in coordinates relative to // |rootLayer}. It also computes our background and foreground clip rects // for painting/event handling. // Pass offsetFromRoot if known. void calculateRects(const ClipRectsContext&, const LayoutRect& paintDirtyRect, LayoutRect& layerBounds, ClipRect& backgroundRect, ClipRect& foregroundRect, ClipRect& outlineRect, const LayoutPoint* offsetFromRoot = 0) const; // 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; private: void parentClipRects(const ClipRectsContext&, ClipRects&) const; // The layer relative to which clipping rects for this layer are computed. RenderLayer* clippingRootForPainting() const; bool isClippingRootForContext(const ClipRectsContext&) const; // FIXME: Could this be a RenderBox? RenderLayerModelObject* m_renderer; OwnPtr<ClipRectsCache> m_clipRectsCache; unsigned m_compositingClipRectsDirty : 1; }; } // namespace WebCore #endif // RenderLayerClipper_h