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LibWeb: Allow working on N+1 frame while N is rasterizing

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This change allows us to overlap rasterization and rendering work across
threads: while the rasterization thread processes frame N, the main
thread can simultaneously work on producing the display list for frame
N+1.
This commit is contained in:
Aliaksandr Kalenik 2025-04-01 00:06:01 +02:00 • committed by Jelle Raaijmakers
parent 7248748157
commit cb722ca18b
Notes: github-actions[bot] 2025-04-01 10:18:57 +00:00
3 changed files with 27 additions and 20 deletions
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23
Services/WebContent/PageClient.cpp
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@ -81,12 +81,7 @@ PageClient::~PageClient() = default;
bool PageClient::is_ready_to_paint() const
{
return m_paint_state == PaintState::Ready;
}
void PageClient::ready_to_paint()
{
m_paint_state = PaintState::Ready;
return m_number_of_queued_rasterization_tasks <= 1;
}
void PageClient::visit_edges(JS::Cell::Visitor& visitor)
@ -220,18 +215,24 @@ void PageClient::process_screenshot_requests()
}
}
void PageClient::ready_to_paint()
{
m_number_of_queued_rasterization_tasks--;
VERIFY(m_number_of_queued_rasterization_tasks >= 0 && m_number_of_queued_rasterization_tasks < 2);
}
void PageClient::paint_next_frame()
{
auto back_store = m_backing_store_manager.back_store();
auto [backing_store_id, back_store] = m_backing_store_manager.acquire_store_for_next_frame();
if (!back_store)
return;
m_paint_state = PaintState::WaitingForClient;
VERIFY(m_number_of_queued_rasterization_tasks <= 1);
m_number_of_queued_rasterization_tasks++;
auto viewport_rect = page().css_to_device_rect(page().top_level_traversable()->viewport_rect());
start_display_list_rendering(viewport_rect, *back_store, {}, [this, viewport_rect]() {
m_backing_store_manager.swap_back_and_front();
client().async_did_paint(m_id, viewport_rect.to_type<int>(), m_backing_store_manager.front_id());
start_display_list_rendering(viewport_rect, *back_store, {}, [this, viewport_rect, backing_store_id] {
client().async_did_paint(m_id, viewport_rect.to_type<int>(), backing_store_id);
});
}