8f29bdb62c
This is a universal value like `initial` and `inherit` and works by reverting the current value to whatever we had at the start of the current cascade origin. The implementation is somewhat inefficient as we make a copy of all current values at the start of each origin. I'm sure we can come up with a way to make this faster eventually.
274 lines
10 KiB
C++
274 lines
10 KiB
C++
/*
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* Copyright (c) 2018-2020, 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 <AK/RedBlackTree.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/Parser/ComponentValue.h>
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#include <LibWeb/CSS/Parser/TokenStream.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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namespace Web::CSS {
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struct MatchingRule {
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JS::GCPtr<CSSStyleRule const> rule;
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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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bool contains_pseudo_element { false };
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};
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class PropertyDependencyNode : public RefCounted<PropertyDependencyNode> {
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public:
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static NonnullRefPtr<PropertyDependencyNode> create(String name)
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{
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return adopt_ref(*new PropertyDependencyNode(move(name)));
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}
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void add_child(NonnullRefPtr<PropertyDependencyNode>);
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bool has_cycles();
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private:
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explicit PropertyDependencyNode(String name);
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String m_name;
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Vector<NonnullRefPtr<PropertyDependencyNode>> m_children;
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bool m_marked { 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 StyleComputer {
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public:
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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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NonnullRefPtr<StyleProperties> create_document_style() const;
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ErrorOr<NonnullRefPtr<StyleProperties>> compute_style(DOM::Element&, Optional<CSS::Selector::PseudoElement> = {}) const;
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ErrorOr<RefPtr<StyleProperties>> compute_pseudo_element_style_if_needed(DOM::Element&, Optional<CSS::Selector::PseudoElement>) const;
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// https://www.w3.org/TR/css-cascade/#origin
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enum class CascadeOrigin {
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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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Vector<MatchingRule> collect_matching_rules(DOM::Element const&, CascadeOrigin, Optional<CSS::Selector::PseudoElement>) 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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void load_fonts_from_sheet(CSSStyleSheet const&);
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struct AnimationKey {
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CSS::CSSStyleDeclaration const* source_declaration;
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DOM::Element const* element;
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};
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struct AnimationTiming {
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struct Linear { };
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struct CubicBezier {
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// Regular parameters
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double x1;
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double y1;
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double x2;
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double y2;
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struct CachedSample {
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double x;
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double y;
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double t;
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};
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mutable Vector<CachedSample, 64> m_cached_x_samples = {};
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CachedSample sample_around(double x) const;
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bool operator==(CubicBezier const& other) const
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{
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return x1 == other.x1 && y1 == other.y1 && x2 == other.x2 && y2 == other.y2;
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}
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};
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struct Steps {
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size_t number_of_steps;
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bool jump_at_start;
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bool jump_at_end;
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};
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Variant<Linear, CubicBezier, Steps> timing_function;
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};
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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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class FontLoader;
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struct MatchingFontCandidate {
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FontFaceKey key;
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FontLoader* loader;
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};
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ErrorOr<RefPtr<StyleProperties>> compute_style_impl(DOM::Element&, Optional<CSS::Selector::PseudoElement>, ComputeStyleMode) const;
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ErrorOr<void> compute_cascaded_values(StyleProperties&, DOM::Element&, Optional<CSS::Selector::PseudoElement>, bool& did_match_any_pseudo_element_rules, ComputeStyleMode) const;
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static RefPtr<Gfx::Font 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::Font 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::Font 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>) const;
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void compute_defaulted_values(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const;
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ErrorOr<void> absolutize_values(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const;
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void transform_box_type_if_needed(StyleProperties&, DOM::Element const&, Optional<CSS::Selector::PseudoElement>) const;
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void compute_defaulted_property_value(StyleProperties&, DOM::Element const*, CSS::PropertyID, Optional<CSS::Selector::PseudoElement>) const;
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RefPtr<StyleValue> resolve_unresolved_style_value(DOM::Element&, Optional<CSS::Selector::PseudoElement>, PropertyID, UnresolvedStyleValue const&) const;
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bool expand_variables(DOM::Element&, Optional<CSS::Selector::PseudoElement>, StringView property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, Parser::TokenStream<Parser::ComponentValue>& source, Vector<Parser::ComponentValue>& dest) const;
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bool expand_unresolved_values(DOM::Element&, StringView property_name, Parser::TokenStream<Parser::ComponentValue>& source, Vector<Parser::ComponentValue>& dest) const;
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void set_all_properties(DOM::Element&, Optional<CSS::Selector::PseudoElement>, StyleProperties&, StyleValue const&, DOM::Document&, CSS::CSSStyleDeclaration const*, StyleProperties::PropertyValues const& properties_for_revert) const;
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template<typename Callback>
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void for_each_stylesheet(CascadeOrigin, Callback) const;
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CSSPixelRect viewport_rect() const;
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[[nodiscard]] Length::FontMetrics calculate_root_element_font_metrics(StyleProperties const&) const;
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CSSPixels parent_or_root_element_line_height(DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const;
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struct MatchingRuleSet {
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Vector<MatchingRule> user_agent_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>, 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 AnimationKeyFrameSet {
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struct ResolvedKeyFrame {
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struct UseInitial { };
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Array<Variant<Empty, UseInitial, NonnullRefPtr<StyleValue const>>, to_underlying(last_property_id) + 1> resolved_properties {};
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};
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RedBlackTree<u64, ResolvedKeyFrame> keyframes_by_key;
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};
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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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Vector<MatchingRule> other_rules;
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HashMap<FlyString, NonnullOwnPtr<AnimationKeyFrameSet>> 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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void ensure_animation_timer() const;
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OwnPtr<RuleCache> m_author_rule_cache;
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OwnPtr<RuleCache> m_user_agent_rule_cache;
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HashMap<FontFaceKey, NonnullOwnPtr<FontLoader>> 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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constexpr static u64 AnimationKeyFrameKeyScaleFactor = 1000; // 0..100000
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enum class AnimationStepTransition {
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NoTransition,
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IdleOrBeforeToActive,
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IdleOrBeforeToAfter,
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ActiveToBefore,
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ActiveToActiveChangingTheIteration,
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ActiveToAfter,
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AfterToActive,
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AfterToBefore,
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Cancelled,
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};
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enum class AnimationState {
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Before,
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After,
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Idle,
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Active,
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};
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struct AnimationStateSnapshot {
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Array<RefPtr<StyleValue const>, to_underlying(last_property_id) + 1> state;
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};
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struct Animation {
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String name;
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Optional<CSS::Time> duration; // "auto" if not set.
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CSS::Time delay;
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Optional<size_t> iteration_count; // Infinite if not set.
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AnimationTiming timing_function;
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CSS::AnimationDirection direction;
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CSS::AnimationFillMode fill_mode;
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WeakPtr<DOM::Element> owning_element;
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CSS::Percentage progress { 0 };
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CSS::Time remaining_delay { 0, CSS::Time::Type::Ms };
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AnimationState current_state { AnimationState::Before };
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size_t current_iteration { 1 };
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mutable AnimationStateSnapshot initial_state {};
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mutable OwnPtr<AnimationStateSnapshot> active_state_if_fill_forward {};
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AnimationStepTransition step(CSS::Time const& time_step);
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ErrorOr<void> collect_into(StyleProperties&, RuleCache const&) const;
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bool is_done() const;
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private:
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float compute_output_progress(float input_progress) const;
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bool is_animating_backwards() const;
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};
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mutable HashMap<AnimationKey, NonnullOwnPtr<Animation>> m_active_animations;
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mutable HashMap<AnimationKey, OwnPtr<AnimationStateSnapshot>> m_finished_animations; // If fill-mode is forward/both, this is non-null and contains the final state.
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mutable RefPtr<Platform::Timer> m_animation_driver_timer;
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};
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}
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template<>
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struct AK::Traits<Web::CSS::StyleComputer::AnimationKey> : public AK::GenericTraits<Web::CSS::StyleComputer::AnimationKey> {
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static unsigned hash(Web::CSS::StyleComputer::AnimationKey const& k) { return pair_int_hash(ptr_hash(k.source_declaration), ptr_hash(k.element)); }
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static bool equals(Web::CSS::StyleComputer::AnimationKey const& a, Web::CSS::StyleComputer::AnimationKey const& b)
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{
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return a.element == b.element && a.source_declaration == b.source_declaration;
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}
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};
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