9340d2d1a3
Move the layout tree from GC allocation to refcounted ownership so removed layout and paint subtrees are destroyed synchronously instead of waiting for the next GC sweep. This dramatically reduces GC memory usage peaks after layout tree churn and makes it easier for memory use to fall back after large document updates. Update layout factories, tree traversal, SVG layout node creation, paintable back-pointers, and pseudo-element layout links to use RefPtr ownership. Make display: contents follow the same shape as Blink and WebKit: the element itself does not create a layout node, and its children are flattened into the nearest layout parent. Wrap direct non-whitespace text in an anonymous inline node when the boxless element contributes inherited style to that text. Use an internal inline wrapper for display: contents pseudo-elements so generated content can still participate in layout, painting, hit testing, and pseudo-element queries. Keep CSSOM reporting the computed display value from the pseudo style, not the internal wrapper. Remove the retained out-of-tree layout node list and its testing hook, since the flattened model does not need a side owner for boxless elements. Add coverage for inherited text style, dynamic insertion order, pseudo-element hit testing, and computed style queries.
92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
/*
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* Copyright (c) 2025-2026, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibGC/Cell.h>
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#include <LibWeb/CSS/CustomPropertyData.h>
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#include <LibWeb/CSS/PseudoElement.h>
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#include <LibWeb/Forward.h>
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namespace Web::DOM {
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// Either an Element or a PseudoElement
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// FIXME: Figure out const-correctness for the Element.
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class WEB_API AbstractElement {
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public:
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AbstractElement(GC::Ref<Element>, Optional<CSS::PseudoElement> = {});
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AbstractElement(Element const&, Optional<CSS::PseudoElement> = {});
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Document& document() const;
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Element& element() { return m_element; }
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Element const& element() const { return m_element; }
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Optional<CSS::PseudoElement> pseudo_element() const { return m_pseudo_element; }
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Layout::NodeWithStyle* layout_node();
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Layout::NodeWithStyle const* layout_node() const { return const_cast<AbstractElement*>(this)->layout_node(); }
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Layout::NodeWithStyle* unsafe_layout_node();
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Layout::NodeWithStyle const* unsafe_layout_node() const { return const_cast<AbstractElement*>(this)->unsafe_layout_node(); }
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struct TreeCountingFunctionResolutionContext {
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size_t sibling_count;
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size_t sibling_index;
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};
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TreeCountingFunctionResolutionContext tree_counting_function_resolution_context() const;
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GC::Ptr<Element const> parent_element() const;
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Optional<AbstractElement> element_to_inherit_style_from() const;
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Optional<AbstractElement> previous_in_tree_order() { return walk_layout_tree(WalkMethod::Previous); }
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Optional<AbstractElement> previous_sibling_in_tree_order() { return walk_layout_tree(WalkMethod::PreviousSibling); }
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bool is_before(AbstractElement const&) const;
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void set_inheritance_override(GC::Ref<Element> element) { m_inheritance_override = element; }
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CSS::ComputedProperties const* computed_properties() const;
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GC::Ptr<CSS::CSSStyleProperties const> inline_style() const;
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void set_custom_property_data(RefPtr<CSS::CustomPropertyData const>);
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[[nodiscard]] RefPtr<CSS::CustomPropertyData const> custom_property_data() const;
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RefPtr<CSS::StyleValue const> get_custom_property(FlyString const& name) const;
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bool has_non_empty_counters_set() const;
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Optional<CSS::CountersSet const&> counters_set() const;
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CSS::CountersSet& ensure_counters_set();
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void set_counters_set(OwnPtr<CSS::CountersSet>&&);
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HashMap<FlyString, GC::Ref<CSS::CSSAnimation>>* css_defined_animations() const;
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void set_has_css_defined_animations();
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void visit(GC::Cell::Visitor& visitor) const;
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String debug_description() const;
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bool operator==(AbstractElement const&) const = default;
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CSS::StyleScope const& style_scope() const;
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private:
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enum class WalkMethod : u8 {
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Previous,
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PreviousSibling,
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};
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Optional<AbstractElement> walk_layout_tree(WalkMethod);
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GC::Ref<Element> m_element;
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Optional<CSS::PseudoElement> m_pseudo_element;
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GC::Ptr<Element> m_inheritance_override;
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};
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}
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template<>
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struct AK::Traits<Web::DOM::AbstractElement> : public DefaultTraits<Web::DOM::AbstractElement> {
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static unsigned hash(Web::DOM::AbstractElement const& key)
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{
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return pair_int_hash(ptr_hash(&key.element()), key.pseudo_element().has_value() ? to_underlying(key.pseudo_element().value()) : -1);
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}
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};
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