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LibWeb: Save ScrollState snapshot in DisplayList to avoid race condition
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Browse source 
With this change we save a copy of of scroll state at the time of
recording a display list, instead of actual ScrollState pointer that
could be modifed by the main thread while display list is beings
rasterized on the rendering thread, which leads to a frame painted with
inconsistent scroll state.

Fixes https://github.com/LadybirdBrowser/ladybird/issues/4288
This commit is contained in:
Aliaksandr Kalenik 2025-04-11 20:00:56 +02:00 • committed by Alexander Kalenik
parent d855adf767
commit 6507d23e29
Notes: github-actions[bot] 2025-04-12 00:56:11 +00:00
18 changed files with 85 additions and 29 deletions
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6
Libraries/LibWeb/HTML/RenderingThread.cpp
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@ -57,17 +57,17 @@ void RenderingThread::rendering_thread_loop()
}
auto painting_surface = painting_surface_for_backing_store(task->backing_store);
m_skia_player->execute(*task->display_list, painting_surface);
m_skia_player->execute(*task->display_list, task->scroll_state_snapshot, painting_surface);
m_main_thread_event_loop.deferred_invoke([callback = move(task->callback)] {
callback();
});
}
}
void RenderingThread::enqueue_rendering_task(NonnullRefPtr<Painting::DisplayList> display_list, NonnullRefPtr<Painting::BackingStore> backing_store, Function<void()>&& callback)
void RenderingThread::enqueue_rendering_task(NonnullRefPtr<Painting::DisplayList> display_list, Painting::ScrollStateSnapshot&& scroll_state_snapshot, NonnullRefPtr<Painting::BackingStore> backing_store, Function<void()>&& callback)
{
Threading::MutexLocker const locker { m_rendering_task_mutex };
m_rendering_tasks.enqueue(Task { move(display_list), move(backing_store), move(callback) });
m_rendering_tasks.enqueue(Task { move(display_list), move(scroll_state_snapshot), move(backing_store), move(callback) });
m_rendering_task_ready_wake_condition.signal();
}