109 lines
3.9 KiB
C++
109 lines
3.9 KiB
C++
/*
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* Copyright (C) 2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "LayoutRect.h"
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#include "RenderLayer.h"
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#include "ScrollTypes.h"
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#include <wtf/Vector.h>
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#include <wtf/WeakPtr.h>
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namespace WTF {
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class TextStream;
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}
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namespace WebCore {
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class ScrollingCoordinator;
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struct CompositedClipData {
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CompositedClipData(RenderLayer* layer, LayoutRect rect, bool isOverflowScrollEntry)
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: clippingLayer(makeWeakPtr(layer))
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, clipRect(rect)
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, isOverflowScroll(isOverflowScrollEntry)
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{
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}
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bool operator==(const CompositedClipData& other) const
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{
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return clippingLayer == other.clippingLayer
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&& clipRect == other.clipRect
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&& isOverflowScroll == other.isOverflowScroll;
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}
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bool operator!=(const CompositedClipData& other) const
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{
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return !(*this == other);
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}
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WeakPtr<RenderLayer> clippingLayer; // For scroller entries, the scrolling layer. For other entries, the most-descendant layer that has a clip.
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LayoutRect clipRect; // In the coordinate system of the RenderLayer that owns the stack.
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bool isOverflowScroll { false };
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};
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// This class encapsulates the set of layers and their scrolling tree nodes representing clipping in the layer's containing block ancestry,
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// but not in its paint order ancestry.
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class LayerAncestorClippingStack {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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LayerAncestorClippingStack(Vector<CompositedClipData>&&);
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~LayerAncestorClippingStack() = default;
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bool hasAnyScrollingLayers() const;
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bool equalToClipData(const Vector<CompositedClipData>&) const;
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bool updateWithClipData(ScrollingCoordinator*, Vector<CompositedClipData>&&);
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Vector<CompositedClipData> compositedClipData() const;
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void clear(ScrollingCoordinator*);
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void detachFromScrollingCoordinator(ScrollingCoordinator&);
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void updateScrollingNodeLayers(ScrollingCoordinator&);
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GraphicsLayer* firstClippingLayer() const;
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GraphicsLayer* lastClippingLayer() const;
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ScrollingNodeID lastOverflowScrollProxyNodeID() const;
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struct ClippingStackEntry {
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CompositedClipData clipData;
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ScrollingNodeID overflowScrollProxyNodeID { 0 }; // The node for repositioning the scrolling proxy layer.
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RefPtr<GraphicsLayer> clippingLayer;
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};
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Vector<ClippingStackEntry>& stack() { return m_stack; }
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const Vector<ClippingStackEntry>& stack() const { return m_stack; }
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private:
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// Order is ancestors to descendants.
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Vector<ClippingStackEntry> m_stack;
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};
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TextStream& operator<<(TextStream&, const LayerAncestorClippingStack&);
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} // namespace WebCore
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