| /* |
| * 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/ClipRectsCache.h" |
| #include "core/rendering/RenderBox.h" |
| |
| namespace blink { |
| |
| class RenderLayer; |
| |
| enum ShouldRespectOverflowClip { |
| IgnoreOverflowClip, |
| RespectOverflowClip |
| }; |
| |
| class ClipRectsContext { |
| public: |
| ClipRectsContext(const RenderLayer* root, ClipRectsCacheSlot slot, OverlayScrollbarSizeRelevancy relevancy = IgnoreOverlayScrollbarSize, const LayoutSize& accumulation = LayoutSize()) |
| : rootLayer(root) |
| , scrollbarRelevancy(relevancy) |
| , cacheSlot(slot) |
| , subPixelAccumulation(accumulation) |
| , respectOverflowClip(RespectOverflowClip) |
| { |
| } |
| |
| void setIgnoreOverflowClip() |
| { |
| ASSERT(!usesCache() || cacheSlot == PaintingClipRects); |
| ASSERT(respectOverflowClip == RespectOverflowClip); |
| cacheSlot = PaintingClipRectsIgnoringOverflowClip; |
| respectOverflowClip = IgnoreOverflowClip; |
| } |
| |
| bool usesCache() const |
| { |
| return cacheSlot != UncachedClipRects; |
| } |
| |
| const RenderLayer* const rootLayer; |
| const OverlayScrollbarSizeRelevancy scrollbarRelevancy; |
| |
| private: |
| friend class RenderLayerClipper; |
| |
| ClipRectsCacheSlot cacheSlot; |
| LayoutSize subPixelAccumulation; |
| ShouldRespectOverflowClip respectOverflowClip; |
| }; |
| |
| class RenderLayerClipper { |
| WTF_MAKE_NONCOPYABLE(RenderLayerClipper); |
| public: |
| explicit RenderLayerClipper(RenderLayerModelObject&); |
| |
| void clearClipRectsIncludingDescendants(); |
| void clearClipRectsIncludingDescendants(ClipRectsCacheSlot); |
| |
| LayoutRect childrenClipRect() const; // Returns the foreground 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. |
| |
| ClipRects* getClipRects(const ClipRectsContext&) const; |
| |
| ClipRect backgroundClipRect(const ClipRectsContext&) const; |
| |
| // 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; |
| |
| private: |
| void calculateClipRects(const ClipRectsContext&, ClipRects&) const; |
| |
| ClipRects* clipRectsIfCached(const ClipRectsContext&) const; |
| ClipRects* storeClipRectsInCache(const ClipRectsContext&, ClipRects* parentClipRects, const ClipRects&) const; |
| |
| // cachedClipRects looks buggy: It doesn't check whether context.rootLayer and entry.root match. |
| // FIXME: Move callers to clipRectsIfCached, which does the proper checks. |
| ClipRects* cachedClipRects(const ClipRectsContext& context) const |
| { |
| return m_cache ? m_cache->get(context.cacheSlot).clipRects.get() : 0; |
| } |
| |
| void getOrCalculateClipRects(const ClipRectsContext&, ClipRects&) const; |
| |
| RenderLayer* clippingRootForPainting() const; |
| |
| ClipRectsCache& cache() const |
| { |
| if (!m_cache) |
| m_cache = adoptPtr(new ClipRectsCache); |
| return *m_cache; |
| } |
| |
| // FIXME: Could this be a RenderBox? |
| RenderLayerModelObject& m_renderer; |
| mutable OwnPtr<ClipRectsCache> m_cache; |
| }; |
| |
| } // namespace blink |
| |
| #endif // RenderLayerClipper_h |