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Implements idea described in https://docs.google.com/document/d/1vEW86DaeVs4uQzNFI5R-_xS9TcS1Cs_EUsHRSgCHGu8 Invalidation sets are used to reduce the number of elements marked for style recalculation by collecting metadata from style rules about the dependencies between properties that could affect an element’s style. Currently, this optimization is only applied to style invalidation triggered by class list mutations on an element.
90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
/*
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* Copyright (c) 2025, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/CSS/InvalidationSet.h>
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namespace Web::CSS {
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void InvalidationSet::include_all_from(InvalidationSet const& other)
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{
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m_needs_invalidate_self |= other.m_needs_invalidate_self;
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m_needs_invalidate_whole_subtree |= other.m_needs_invalidate_whole_subtree;
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for (auto const& property : other.m_properties)
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m_properties.set(property);
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}
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bool InvalidationSet::is_empty() const
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{
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return !m_needs_invalidate_self && !m_needs_invalidate_whole_subtree && m_properties.is_empty();
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}
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void InvalidationSet::for_each_property(Function<void(Property const&)> const& callback) const
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{
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if (m_needs_invalidate_self)
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callback({ Property::Type::InvalidateSelf });
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if (m_needs_invalidate_whole_subtree)
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callback({ Property::Type::InvalidateWholeSubtree });
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for (auto const& property : m_properties)
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callback(property);
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}
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}
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namespace AK {
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unsigned Traits<Web::CSS::InvalidationSet::Property>::hash(Web::CSS::InvalidationSet::Property const& invalidation_set_property)
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{
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return pair_int_hash(to_underlying(invalidation_set_property.type), invalidation_set_property.name.hash());
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}
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ErrorOr<void> Formatter<Web::CSS::InvalidationSet::Property>::format(FormatBuilder& builder, Web::CSS::InvalidationSet::Property const& invalidation_set_property)
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{
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switch (invalidation_set_property.type) {
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case Web::CSS::InvalidationSet::Property::Type::InvalidateSelf: {
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TRY(builder.put_string("$"sv));
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return {};
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}
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case Web::CSS::InvalidationSet::Property::Type::Class: {
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TRY(builder.put_string("."sv));
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TRY(builder.put_string(invalidation_set_property.name));
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return {};
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}
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case Web::CSS::InvalidationSet::Property::Type::Id: {
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TRY(builder.put_string("#"sv));
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TRY(builder.put_string(invalidation_set_property.name));
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return {};
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}
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case Web::CSS::InvalidationSet::Property::Type::TagName: {
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TRY(builder.put_string(invalidation_set_property.name));
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return {};
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}
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case Web::CSS::InvalidationSet::Property::Type::Attribute: {
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TRY(builder.put_string("["sv));
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TRY(builder.put_string(invalidation_set_property.name));
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TRY(builder.put_string("]"sv));
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return {};
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}
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case Web::CSS::InvalidationSet::Property::Type::InvalidateWholeSubtree: {
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TRY(builder.put_string("*"sv));
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return {};
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}
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default:
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VERIFY_NOT_REACHED();
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}
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}
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ErrorOr<void> Formatter<Web::CSS::InvalidationSet>::format(FormatBuilder& builder, Web::CSS::InvalidationSet const& invalidation_set)
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{
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bool first = true;
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invalidation_set.for_each_property([&](auto const& property) {
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if (!first)
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builder.builder().append(", "sv);
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builder.builder().appendff("{}", property);
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});
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return {};
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}
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}
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