1b810a5e15
Introduce a dedicated Compositor IPC channel between the UI process and WebContent. Use it for backing-store setup, presented bitmap delivery, and bitmap-specific ready_to_paint acknowledgements. This makes CompositorThread the single owner of frame presentation bookkeeping before async scrolling starts producing frames without the main thread. Remove old paint and backing-store messages from WebContentClient and PageClient so the UI process no longer observes two presentation protocols.
76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*
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* Copyright (c) 2024-2026, 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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#include <LibCore/Timer.h>
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#include <LibWeb/HTML/TraversableNavigable.h>
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#include <LibWeb/Painting/BackingStoreManager.h>
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namespace Web::Painting {
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GC_DEFINE_ALLOCATOR(BackingStoreManager);
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BackingStoreManager::BackingStoreManager(HTML::Navigable& navigable)
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: m_navigable(navigable)
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{
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m_backing_store_shrink_timer = Core::Timer::create_single_shot(3000, [this] {
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resize_backing_stores_if_needed(WindowResizingInProgress::No);
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});
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}
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void BackingStoreManager::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_navigable);
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}
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void BackingStoreManager::finalize()
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{
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Base::finalize();
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m_backing_store_shrink_timer->on_timeout = {};
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m_backing_store_shrink_timer->stop();
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m_backing_store_shrink_timer.clear();
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}
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void BackingStoreManager::restart_resize_timer()
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{
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m_backing_store_shrink_timer->restart();
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}
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void BackingStoreManager::reallocate_backing_stores(Gfx::IntSize size)
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{
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m_front_bitmap_id = m_next_bitmap_id++;
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m_back_bitmap_id = m_next_bitmap_id++;
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m_allocated_size = size;
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m_navigable->rendering_thread().update_backing_stores(size, m_front_bitmap_id, m_back_bitmap_id);
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}
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void BackingStoreManager::resize_backing_stores_if_needed(WindowResizingInProgress window_resize_in_progress)
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{
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if (m_navigable->is_svg_page())
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return;
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auto viewport_size = m_navigable->page().css_to_device_rect(m_navigable->viewport_rect()).size();
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if (viewport_size.is_empty())
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return;
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Web::DevicePixelSize minimum_needed_size;
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bool force_reallocate = false;
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if (window_resize_in_progress == WindowResizingInProgress::Yes && m_navigable->is_top_level_traversable()) {
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// Pad the minimum needed size so that we don't have to keep reallocating backing stores while the window is being resized.
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minimum_needed_size = { viewport_size.width() + 256, viewport_size.height() + 256 };
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} else {
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// If we're not in the middle of a resize, we can shrink the backing store size to match the viewport size.
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minimum_needed_size = viewport_size;
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force_reallocate = m_allocated_size != minimum_needed_size.to_type<int>();
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}
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if (force_reallocate || m_allocated_size.is_empty() || !m_allocated_size.contains(minimum_needed_size.to_type<int>())) {
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reallocate_backing_stores(minimum_needed_size.to_type<int>());
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}
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}
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}
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