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