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https://github.com/flutter/flutter.git
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130 lines
4.9 KiB
C++
130 lines
4.9 KiB
C++
/*
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* Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
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* Copyright (C) 2013 Intel Corporation. All rights reserved.
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*
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* Portions are Copyright (C) 1998 Netscape Communications Corporation.
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*
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* Other contributors:
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* Robert O'Callahan <roc+@cs.cmu.edu>
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* David Baron <dbaron@fas.harvard.edu>
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* Christian Biesinger <cbiesinger@web.de>
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* Randall Jesup <rjesup@wgate.com>
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* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
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* Josh Soref <timeless@mac.com>
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* Boris Zbarsky <bzbarsky@mit.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Alternatively, the contents of this file may be used under the terms
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* of either the Mozilla Public License Version 1.1, found at
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* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
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* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
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* (the "GPL"), in which case the provisions of the MPL or the GPL are
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* applicable instead of those above. If you wish to allow use of your
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* version of this file only under the terms of one of those two
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* licenses (the MPL or the GPL) and not to allow others to use your
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* version of this file under the LGPL, indicate your decision by
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* deletingthe provisions above and replace them with the notice and
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* other provisions required by the MPL or the GPL, as the case may be.
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* If you do not delete the provisions above, a recipient may use your
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* version of this file under any of the LGPL, the MPL or the GPL.
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*/
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#ifndef SKY_ENGINE_CORE_RENDERING_RENDERLAYERCLIPPER_H_
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#define SKY_ENGINE_CORE_RENDERING_RENDERLAYERCLIPPER_H_
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#include "flutter/sky/engine/core/rendering/ClipRectsCache.h"
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#include "flutter/sky/engine/core/rendering/RenderBox.h"
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namespace blink {
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class RenderLayer;
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class ClipRectsContext {
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public:
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ClipRectsContext(const RenderLayer* root,
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ClipRectsCacheSlot slot,
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const LayoutSize& accumulation = LayoutSize())
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: rootLayer(root), cacheSlot(slot), subPixelAccumulation(accumulation) {}
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bool usesCache() const { return cacheSlot != UncachedClipRects; }
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const RenderLayer* const rootLayer;
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private:
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friend class RenderLayerClipper;
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ClipRectsCacheSlot cacheSlot;
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LayoutSize subPixelAccumulation;
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};
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class RenderLayerClipper {
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WTF_MAKE_NONCOPYABLE(RenderLayerClipper);
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public:
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explicit RenderLayerClipper(RenderBox&);
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void clearClipRectsIncludingDescendants();
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void clearClipRectsIncludingDescendants(ClipRectsCacheSlot);
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LayoutRect localClipRect() const; // Returns the background clip rect of the
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// layer in the local coordinate space.
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ClipRects* getClipRects(const ClipRectsContext&) const;
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ClipRect backgroundClipRect(const ClipRectsContext&) const;
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// This method figures out our layerBounds in coordinates relative to
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// |rootLayer|. It also computes our clip rects for painting/event handling.
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void calculateRects(const ClipRectsContext&,
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const LayoutRect& paintDirtyRect,
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LayoutRect& layerBounds,
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ClipRect& backgroundRect,
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const LayoutPoint* offsetFromRoot = 0) const;
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private:
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void calculateClipRects(const ClipRectsContext&, ClipRects&) const;
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ClipRects* clipRectsIfCached(const ClipRectsContext&) const;
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ClipRects* storeClipRectsInCache(const ClipRectsContext&,
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ClipRects* parentClipRects,
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const ClipRects&) const;
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// cachedClipRects looks buggy: It doesn't check whether context.rootLayer and
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// entry.root match.
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// FIXME: Move callers to clipRectsIfCached, which does the proper checks.
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ClipRects* cachedClipRects(const ClipRectsContext& context) const {
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return m_cache ? m_cache->get(context.cacheSlot).clipRects.get() : 0;
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}
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void getOrCalculateClipRects(const ClipRectsContext&, ClipRects&) const;
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RenderLayer* clippingRootForPainting() const;
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ClipRectsCache& cache() const {
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if (!m_cache)
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m_cache = adoptPtr(new ClipRectsCache);
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return *m_cache;
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}
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// FIXME: Could this be a RenderBox?
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RenderBox& m_renderer;
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mutable OwnPtr<ClipRectsCache> m_cache;
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};
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} // namespace blink
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#endif // SKY_ENGINE_CORE_RENDERING_RENDERLAYERCLIPPER_H_
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