mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-04-26 01:35:08 +02:00
e2d5d72f55
Pre-compute per-observer values (root node, root paintable, root bounds, is_implicit_root, root_is_element) once before the per-target loop instead of recomputing them for each target. Add intersection_root_node() which returns GC::Ref<DOM::Node> without creating GC::Root wrappers. Previously, intersection_root() was called multiple times per target (in the skip condition check, in compute_intersection, and again in root_intersection_rectangle inside compute_intersection), each call creating GC::Root objects that require heap allocation via new RootImpl. Pass the pre-computed root bounds and root paintable into compute_intersection instead of having it call root_intersection_rectangle() and intersection_root() internally. For an observer watching N targets, this eliminates roughly 4N heap allocations per frame.
103 lines
4.2 KiB
C++
103 lines
4.2 KiB
C++
/*
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* Copyright (c) 2021, Tim Flynn <trflynn89@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 <LibGC/Root.h>
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#include <LibWeb/Bindings/PlatformObject.h>
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#include <LibWeb/IntersectionObserver/IntersectionObserverEntry.h>
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#include <LibWeb/IntersectionObserver/IntersectionObserverRegistration.h>
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#include <LibWeb/PixelUnits.h>
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namespace Web::IntersectionObserver {
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struct IntersectionObserverInit {
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Optional<Variant<GC::Root<DOM::Element>, GC::Root<DOM::Document>>> root;
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String root_margin { "0px"_string };
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String scroll_margin { "0px"_string };
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Variant<double, Vector<double>> threshold { 0 };
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long delay = 0;
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bool track_visibility = false;
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};
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// https://w3c.github.io/IntersectionObserver/#intersection-observer-interface
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class IntersectionObserver final : public Bindings::PlatformObject {
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WEB_PLATFORM_OBJECT(IntersectionObserver, Bindings::PlatformObject);
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GC_DECLARE_ALLOCATOR(IntersectionObserver);
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public:
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static constexpr bool OVERRIDES_FINALIZE = true;
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static WebIDL::ExceptionOr<GC::Ref<IntersectionObserver>> construct_impl(JS::Realm&, GC::Ptr<WebIDL::CallbackType> callback, IntersectionObserverInit const& options = {});
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virtual ~IntersectionObserver() override;
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void observe(DOM::Element& target);
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void unobserve(DOM::Element& target);
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void disconnect();
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Vector<GC::Root<IntersectionObserverEntry>> take_records();
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Vector<GC::Ref<DOM::Element>> const& observation_targets() const { return m_observation_targets; }
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Variant<GC::Root<DOM::Element>, GC::Root<DOM::Document>, Empty> root() const;
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String root_margin() const;
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String scroll_margin() const;
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Vector<CSS::LengthPercentage> const& scroll_margin_values() const { return m_scroll_margin; }
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Vector<double> const& thresholds() const { return m_thresholds; }
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long delay() const { return m_delay; }
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bool track_visibility() const { return m_track_visibility; }
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Variant<GC::Root<DOM::Element>, GC::Root<DOM::Document>> intersection_root() const;
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GC::Ref<DOM::Node> intersection_root_node() const;
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bool is_implicit_root() const { return !m_root; }
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CSSPixelRect root_intersection_rectangle() const;
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void queue_entry(Badge<DOM::Document>, GC::Ref<IntersectionObserverEntry>);
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WebIDL::CallbackType& callback() { return *m_callback; }
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private:
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explicit IntersectionObserver(JS::Realm&, GC::Ptr<WebIDL::CallbackType> callback, Optional<Variant<GC::Root<DOM::Element>, GC::Root<DOM::Document>>> const& root, Vector<CSS::LengthPercentage> root_margin, Vector<CSS::LengthPercentage> scroll_margin, Vector<double>&& thresholds, double debug, bool track_visibility);
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(JS::Cell::Visitor&) override;
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virtual void finalize() override;
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static Optional<Vector<CSS::LengthPercentage>> parse_a_margin(JS::Realm&, String);
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-callback-slot
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GC::Ptr<WebIDL::CallbackType> m_callback;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-root
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GC::Ptr<DOM::Node> m_root;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-rootmargin
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Vector<CSS::LengthPercentage> m_root_margin;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-scrollmargin
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Vector<CSS::LengthPercentage> m_scroll_margin;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-thresholds
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Vector<double> m_thresholds;
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// https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-delay
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long m_delay;
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// https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-trackvisibility
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bool m_track_visibility;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-queuedentries-slot
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Vector<GC::Ref<IntersectionObserverEntry>> m_queued_entries;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-observationtargets-slot
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Vector<GC::Ref<DOM::Element>> m_observation_targets;
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// AD-HOC: This is the document where we've registered the IntersectionObserver.
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GC::Weak<DOM::Document> m_document;
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};
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}
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