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https://github.com/LadybirdBrowser/ladybird.git
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0e3487b9ab
This matches the name in the CSS Typed OM spec. https://drafts.css-houdini.org/css-typed-om-1/#cssstylevalue No behaviour changes.
261 lines
10 KiB
C++
261 lines
10 KiB
C++
/*
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* Copyright (c) 2018-2024, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.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 <AK/HashMap.h>
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#include <AK/Optional.h>
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#include <AK/OwnPtr.h>
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#include <LibGfx/Font/Typeface.h>
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#include <LibWeb/Animations/KeyframeEffect.h>
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#include <LibWeb/CSS/CSSFontFaceRule.h>
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#include <LibWeb/CSS/CSSKeyframesRule.h>
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#include <LibWeb/CSS/CSSStyleDeclaration.h>
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#include <LibWeb/CSS/Selector.h>
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#include <LibWeb/CSS/StyleProperties.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/Loader/ResourceLoader.h>
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namespace Web::CSS {
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// A counting bloom filter with 2 hash functions.
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// NOTE: If a counter overflows, it's kept maxed-out until the whole filter is cleared.
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template<typename CounterType, size_t key_bits>
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class CountingBloomFilter {
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public:
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CountingBloomFilter() { }
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void clear() { __builtin_memset(m_buckets, 0, sizeof(m_buckets)); }
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void increment(u32 key)
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{
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auto& first = bucket1(key);
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if (first < NumericLimits<CounterType>::max())
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++first;
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auto& second = bucket2(key);
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if (second < NumericLimits<CounterType>::max())
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++second;
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}
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void decrement(u32 key)
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{
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auto& first = bucket1(key);
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if (first < NumericLimits<CounterType>::max())
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--first;
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auto& second = bucket2(key);
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if (second < NumericLimits<CounterType>::max())
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--second;
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}
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[[nodiscard]] bool may_contain(u32 hash) const
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{
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return bucket1(hash) && bucket2(hash);
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}
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private:
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static constexpr u32 bucket_count = 1 << key_bits;
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static constexpr u32 key_mask = bucket_count - 1;
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[[nodiscard]] u32 hash1(u32 key) const { return key & key_mask; }
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[[nodiscard]] u32 hash2(u32 key) const { return (key >> 16) & key_mask; }
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[[nodiscard]] CounterType& bucket1(u32 key) { return m_buckets[hash1(key)]; }
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[[nodiscard]] CounterType& bucket2(u32 key) { return m_buckets[hash2(key)]; }
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[[nodiscard]] CounterType bucket1(u32 key) const { return m_buckets[hash1(key)]; }
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[[nodiscard]] CounterType bucket2(u32 key) const { return m_buckets[hash2(key)]; }
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CounterType m_buckets[bucket_count];
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};
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// https://www.w3.org/TR/css-cascade/#origin
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enum class CascadeOrigin : u8 {
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Author,
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User,
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UserAgent,
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Animation,
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Transition,
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};
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struct MatchingRule {
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JS::GCPtr<DOM::ShadowRoot const> shadow_root;
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JS::GCPtr<CSSStyleRule const> rule;
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JS::GCPtr<CSSStyleSheet const> sheet;
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size_t style_sheet_index { 0 };
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size_t rule_index { 0 };
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size_t selector_index { 0 };
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u32 specificity { 0 };
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CascadeOrigin cascade_origin;
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bool contains_pseudo_element { false };
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bool contains_root_pseudo_class { false };
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bool can_use_fast_matches { false };
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};
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struct FontFaceKey {
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FlyString family_name;
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int weight { 0 };
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int slope { 0 };
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[[nodiscard]] u32 hash() const { return pair_int_hash(family_name.hash(), pair_int_hash(weight, slope)); }
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[[nodiscard]] bool operator==(FontFaceKey const&) const = default;
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};
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class FontLoader;
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class StyleComputer {
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public:
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enum class AllowUnresolved {
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Yes,
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No,
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};
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static void for_each_property_expanding_shorthands(PropertyID, CSSStyleValue const&, AllowUnresolved, Function<void(PropertyID, CSSStyleValue const&)> const& set_longhand_property);
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static void set_property_expanding_shorthands(StyleProperties&, PropertyID, CSSStyleValue const&, CSS::CSSStyleDeclaration const*, StyleProperties const& style_for_revert, Important = Important::No);
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static NonnullRefPtr<CSSStyleValue const> get_inherit_value(JS::Realm& initial_value_context_realm, CSS::PropertyID, DOM::Element const*, Optional<CSS::Selector::PseudoElement::Type> = {});
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explicit StyleComputer(DOM::Document&);
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~StyleComputer();
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DOM::Document& document() { return m_document; }
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DOM::Document const& document() const { return m_document; }
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void reset_ancestor_filter();
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void push_ancestor(DOM::Element const&);
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void pop_ancestor(DOM::Element const&);
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NonnullRefPtr<StyleProperties> create_document_style() const;
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NonnullRefPtr<StyleProperties> compute_style(DOM::Element&, Optional<CSS::Selector::PseudoElement::Type> = {}) const;
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RefPtr<StyleProperties> compute_pseudo_element_style_if_needed(DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>) const;
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Vector<MatchingRule> collect_matching_rules(DOM::Element const&, CascadeOrigin, Optional<CSS::Selector::PseudoElement::Type>) const;
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void invalidate_rule_cache();
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Gfx::Font const& initial_font() const;
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void did_load_font(FlyString const& family_name);
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Optional<FontLoader&> load_font_face(ParsedFontFace const&, ESCAPING Function<void(FontLoader const&)> on_load = {}, ESCAPING Function<void()> on_fail = {});
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void load_fonts_from_sheet(CSSStyleSheet const&);
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RefPtr<Gfx::FontCascadeList const> compute_font_for_style_values(DOM::Element const* element, Optional<CSS::Selector::PseudoElement::Type> pseudo_element, CSSStyleValue const& font_family, CSSStyleValue const& font_size, CSSStyleValue const& font_style, CSSStyleValue const& font_weight, CSSStyleValue const& font_stretch, int math_depth = 0) const;
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void set_viewport_rect(Badge<DOM::Document>, CSSPixelRect const& viewport_rect) { m_viewport_rect = viewport_rect; }
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enum class AnimationRefresh {
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No,
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Yes,
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};
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void collect_animation_into(DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, JS::NonnullGCPtr<Animations::KeyframeEffect> animation, StyleProperties& style_properties, AnimationRefresh = AnimationRefresh::No) const;
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private:
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enum class ComputeStyleMode {
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Normal,
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CreatePseudoElementStyleIfNeeded,
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};
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struct MatchingFontCandidate;
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[[nodiscard]] bool should_reject_with_ancestor_filter(Selector const&) const;
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RefPtr<StyleProperties> compute_style_impl(DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, ComputeStyleMode) const;
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void compute_cascaded_values(StyleProperties&, DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, bool& did_match_any_pseudo_element_rules, ComputeStyleMode) const;
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static RefPtr<Gfx::FontCascadeList const> find_matching_font_weight_ascending(Vector<MatchingFontCandidate> const& candidates, int target_weight, float font_size_in_pt, bool inclusive);
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static RefPtr<Gfx::FontCascadeList const> find_matching_font_weight_descending(Vector<MatchingFontCandidate> const& candidates, int target_weight, float font_size_in_pt, bool inclusive);
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RefPtr<Gfx::FontCascadeList const> font_matching_algorithm(FontFaceKey const& key, float font_size_in_pt) const;
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void compute_font(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement::Type>) const;
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void compute_math_depth(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement::Type>) const;
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void compute_defaulted_values(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement::Type>) const;
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void absolutize_values(StyleProperties&) const;
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void resolve_effective_overflow_values(StyleProperties&) const;
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void transform_box_type_if_needed(StyleProperties&, DOM::Element const&, Optional<CSS::Selector::PseudoElement::Type>) const;
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void compute_defaulted_property_value(StyleProperties&, DOM::Element const*, CSS::PropertyID, Optional<CSS::Selector::PseudoElement::Type>) const;
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void set_all_properties(DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, StyleProperties&, CSSStyleValue const&, DOM::Document&, CSS::CSSStyleDeclaration const*, StyleProperties const& style_for_revert, Important = Important::No) const;
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template<typename Callback>
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void for_each_stylesheet(CascadeOrigin, Callback) const;
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[[nodiscard]] CSSPixelRect viewport_rect() const { return m_viewport_rect; }
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[[nodiscard]] Length::FontMetrics calculate_root_element_font_metrics(StyleProperties const&) const;
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struct MatchingRuleSet {
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Vector<MatchingRule> user_agent_rules;
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Vector<MatchingRule> user_rules;
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Vector<MatchingRule> author_rules;
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};
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void cascade_declarations(StyleProperties&, DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, Vector<MatchingRule> const&, CascadeOrigin, Important) const;
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void build_rule_cache();
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void build_rule_cache_if_needed() const;
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JS::NonnullGCPtr<DOM::Document> m_document;
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struct RuleCache {
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HashMap<FlyString, Vector<MatchingRule>> rules_by_id;
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HashMap<FlyString, Vector<MatchingRule>> rules_by_class;
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HashMap<FlyString, Vector<MatchingRule>> rules_by_tag_name;
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HashMap<FlyString, Vector<MatchingRule>, AK::ASCIICaseInsensitiveFlyStringTraits> rules_by_attribute_name;
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Vector<MatchingRule> pseudo_element_rules;
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Vector<MatchingRule> root_rules;
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Vector<MatchingRule> other_rules;
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HashMap<FlyString, NonnullRefPtr<Animations::KeyframeEffect::KeyFrameSet>> rules_by_animation_keyframes;
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};
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NonnullOwnPtr<RuleCache> make_rule_cache_for_cascade_origin(CascadeOrigin);
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RuleCache const& rule_cache_for_cascade_origin(CascadeOrigin) const;
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OwnPtr<RuleCache> m_author_rule_cache;
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OwnPtr<RuleCache> m_user_rule_cache;
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OwnPtr<RuleCache> m_user_agent_rule_cache;
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JS::Handle<CSSStyleSheet> m_user_style_sheet;
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using FontLoaderList = Vector<NonnullOwnPtr<FontLoader>>;
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HashMap<FontFaceKey, FontLoaderList> m_loaded_fonts;
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Length::FontMetrics m_default_font_metrics;
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Length::FontMetrics m_root_element_font_metrics;
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CSSPixelRect m_viewport_rect;
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CountingBloomFilter<u8, 14> m_ancestor_filter;
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};
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class FontLoader : public ResourceClient {
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public:
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FontLoader(StyleComputer& style_computer, FlyString family_name, Vector<Gfx::UnicodeRange> unicode_ranges, Vector<URL::URL> urls, ESCAPING Function<void(FontLoader const&)> on_load = {}, ESCAPING Function<void()> on_fail = {});
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virtual ~FontLoader() override;
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Vector<Gfx::UnicodeRange> const& unicode_ranges() const { return m_unicode_ranges; }
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RefPtr<Gfx::Typeface> vector_font() const { return m_vector_font; }
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virtual void resource_did_load() override;
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virtual void resource_did_fail() override;
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RefPtr<Gfx::Font> font_with_point_size(float point_size);
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void start_loading_next_url();
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private:
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ErrorOr<NonnullRefPtr<Gfx::Typeface>> try_load_font();
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StyleComputer& m_style_computer;
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FlyString m_family_name;
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Vector<Gfx::UnicodeRange> m_unicode_ranges;
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RefPtr<Gfx::Typeface> m_vector_font;
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Vector<URL::URL> m_urls;
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Function<void(FontLoader const&)> m_on_load;
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Function<void()> m_on_fail;
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};
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}
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