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LibWeb: Make LayoutState use HashMap instead of potentially huge Vector
Before this change, LayoutState essentially had a Vector<UsedValues*> resized to the exact number of layout nodes in the current document. When a nested layout is performed (to calculate the intrinsic size of something), we make a new LayoutState with its own Vector. If an entry is missing in a nested LayoutState, we check the parent chain all the way up to the root. Because each nested LayoutState had to allocate a new Vector with space for all layout nodes, this could get really nasty on very large pages (such as the ECMA262 specification). This patch replaces the Vector with a HashMap. There's now a small cost to lookups, but what we get in return is the ability to handle huge layout trees without spending eternity in page faults.
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6 changed files with 35 additions and 42 deletions
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@ -859,13 +859,11 @@ void Document::update_layout()
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auto viewport_rect = browsing_context()->viewport_rect();
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if (!m_layout_root) {
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m_next_layout_node_serial_id = 0;
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Layout::TreeBuilder tree_builder;
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m_layout_root = verify_cast<Layout::Viewport>(*tree_builder.build(*this));
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}
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Layout::LayoutState layout_state;
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layout_state.used_values_per_layout_node.resize(layout_node_count());
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{
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Layout::BlockFormattingContext root_formatting_context(layout_state, *m_layout_root, nullptr);
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