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https://github.com/LadybirdBrowser/ladybird.git
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a86f318a9b
In preparation for handling input events on the rendering thread, move backpressure management to RenderingThread. The rendering thread needs to manage this independently without querying the main thread. Previously, the main thread would block when the UI process hadn't yet released the backing surface. Now, the main thread can continue producing display lists while the UI process is busy, allowing more work to happen in parallel. When rasterization is slow and display lists are produced faster than they can be consumed, presentation requests are naturally coalesced using a flag-based approach - multiple present_frame() calls simply update the pending state, resulting in a single rasterization with the latest display list.
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/*
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* Copyright (c) 2025-2026, 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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#pragma once
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#include <AK/Noncopyable.h>
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#include <AK/Queue.h>
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#include <LibCore/Promise.h>
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#include <LibThreading/ConditionVariable.h>
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#include <LibThreading/Forward.h>
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#include <LibThreading/Mutex.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/Page/Page.h>
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namespace Web::HTML {
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class RenderingThread {
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AK_MAKE_NONCOPYABLE(RenderingThread);
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AK_MAKE_NONMOVABLE(RenderingThread);
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class ThreadData;
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public:
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using PresentationCallback = Function<void(Gfx::IntRect const&, i32)>;
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explicit RenderingThread(PresentationCallback);
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~RenderingThread();
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void start(DisplayListPlayerType);
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void set_skia_player(OwnPtr<Painting::DisplayListPlayerSkia>&& player);
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void update_display_list(NonnullRefPtr<Painting::DisplayList>, Painting::ScrollStateSnapshotByDisplayList&&);
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void update_backing_stores(RefPtr<Gfx::PaintingSurface> front, RefPtr<Gfx::PaintingSurface> back, i32 front_id, i32 back_id);
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void present_frame(Gfx::IntRect);
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void request_screenshot(NonnullRefPtr<Gfx::PaintingSurface>, Function<void()>&& callback);
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void ready_to_paint();
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private:
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NonnullRefPtr<ThreadData> m_thread_data;
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RefPtr<Threading::Thread> m_thread;
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NonnullRefPtr<Core::Promise<NonnullRefPtr<Core::EventReceiver>>> m_main_thread_exit_promise;
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};
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}
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