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LibWeb: Build stacking context tree lazily

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There's no actual need to build the stacking context tree before
performing layout. Instead, make it lazy and build the tree when it's
actually needed for something.

This avoids a bunch of work in situations where multiple synchronous
layouts are forced (typically by JavaScript) without painting or hit
testing taking place in between.

It also opens up for style invalidations that only target the stacking
context tree.
This commit is contained in:
Andreas Kling 2022-03-21 10:56:02 +01:00
parent 89086c337c
commit 59afdb959f
5 changed files with 23 additions and 8 deletions
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4
Userland/Libraries/LibWeb/Layout/InitialContainingBlock.h
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@ -24,11 +24,11 @@ public:
void set_selection(const LayoutRange&);
void set_selection_end(const LayoutPosition&);
void build_stacking_context_tree();
void build_stacking_context_tree_if_needed();
void recompute_selection_states();
private:
void build_stacking_context_tree();
virtual bool is_initial_containing_block_box() const override { return true; }
LayoutRange m_selection;