4a43d0ac98
Implements https://github.com/whatwg/html/pull/10007 which basically moves style, layout and painting from HTML processing task into HTML task with "rendering" source. The biggest difference is that now we no longer schedule HTML event loop processing whenever we might need a repaint, but instead queue a global rendering task 60 times per second that will check if any documents need a style/layout/paint update. That is a great simplification of our repaint scheduling model. Before we had: - Optional timer that schedules animation updates 60 hz - Optional timer that schedules rAF updates - PaintWhenReady state to schedule a paint if navigable doesn't have a rendering opportunity on the last event loop iteration Now all that is gone and replaced with a single timer that drives repainting at 60 hz and we don't have to worry about excessive repaints. In the future, hard-coded 60 hz refresh interval could be replaced with CADisplayLink on macOS and similar API on linux to drive repainting in synchronization with display's refresh rate.
105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
/*
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* Copyright (c) 2021-2024, Andreas Kling <kling@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/DistinctNumeric.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibJS/Heap/CellAllocator.h>
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#include <LibJS/SafeFunction.h>
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#include <LibWeb/Forward.h>
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namespace Web::HTML {
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struct UniqueTaskSource;
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AK_TYPEDEF_DISTINCT_NUMERIC_GENERAL(u64, TaskID, Comparison);
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class Task final : public JS::Cell {
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JS_CELL(Task, JS::Cell);
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JS_DECLARE_ALLOCATOR(Task);
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public:
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// https://html.spec.whatwg.org/multipage/webappapis.html#generic-task-sources
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enum class Source {
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Unspecified,
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DOMManipulation,
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UserInteraction,
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Networking,
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HistoryTraversal,
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IdleTask,
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PostedMessage,
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Microtask,
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TimerTask,
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JavaScriptEngine,
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// https://html.spec.whatwg.org/multipage/webappapis.html#navigation-and-traversal-task-source
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NavigationAndTraversal,
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// https://w3c.github.io/FileAPI/#fileReadingTaskSource
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FileReading,
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// https://www.w3.org/TR/intersection-observer/#intersectionobserver-task-source
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IntersectionObserver,
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// https://w3c.github.io/performance-timeline/#dfn-performance-timeline-task-source
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PerformanceTimeline,
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// https://html.spec.whatwg.org/multipage/canvas.html#canvas-blob-serialisation-task-source
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CanvasBlobSerializationTask,
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// https://w3c.github.io/clipboard-apis/#clipboard-task-source
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Clipboard,
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// https://w3c.github.io/permissions/#permissions-task-source
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Permissions,
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// https://drafts.csswg.org/css-font-loading/#task-source
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FontLoading,
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// https://html.spec.whatwg.org/multipage/server-sent-events.html#remote-event-task-source
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RemoteEvent,
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// https://html.spec.whatwg.org/multipage/webappapis.html#rendering-task-source
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Rendering,
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// !!! IMPORTANT: Keep this field last!
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// This serves as the base value of all unique task sources.
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// Some elements, such as the HTMLMediaElement, must have a unique task source per instance.
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UniqueTaskSourceStart
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};
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static JS::NonnullGCPtr<Task> create(JS::VM&, Source, JS::GCPtr<DOM::Document const>, JS::NonnullGCPtr<JS::HeapFunction<void()>> steps);
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virtual ~Task() override;
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[[nodiscard]] TaskID id() const { return m_id; }
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Source source() const { return m_source; }
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void execute();
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DOM::Document const* document() const;
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bool is_runnable() const;
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private:
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Task(Source, JS::GCPtr<DOM::Document const>, JS::NonnullGCPtr<JS::HeapFunction<void()>> steps);
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virtual void visit_edges(Visitor&) override;
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TaskID m_id {};
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Source m_source { Source::Unspecified };
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JS::NonnullGCPtr<JS::HeapFunction<void()>> m_steps;
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JS::GCPtr<DOM::Document const> m_document;
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};
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struct UniqueTaskSource {
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UniqueTaskSource();
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~UniqueTaskSource();
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Task::Source const source;
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};
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}
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