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LibWeb: Don't compute full style for ::before/::after unless matched

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Before this patch, we would build full computed style for these pseudo
elements, for every DOM element, even if no ::before/::after selector
actually matched.

This was a colossal waste of time, and we can also just not do that.
Instead, just abort pseudo element style resolution early if no relevant
selectors matched. :^)
This commit is contained in:
Andreas Kling 2023-03-14 16:36:20 +01:00
parent a58d84407f
commit 3e970540b4
3 changed files with 36 additions and 5 deletions
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7
Userland/Libraries/LibWeb/Layout/TreeBuilder.cpp
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@ -154,7 +154,10 @@ ErrorOr<void> TreeBuilder::create_pseudo_element_if_needed(DOM::Element& element
auto& document = element.document();
auto& style_computer = document.style_computer();
auto pseudo_element_style = TRY(style_computer.compute_style(element, pseudo_element));
auto pseudo_element_style = TRY(style_computer.compute_pseudo_element_style_if_needed(element, pseudo_element));
if (!pseudo_element_style)
return {};
auto pseudo_element_content = pseudo_element_style->content();
auto pseudo_element_display = pseudo_element_style->display();
// ::before and ::after only exist if they have content. `content: normal` computes to `none` for them.
@ -164,7 +167,7 @@ ErrorOr<void> TreeBuilder::create_pseudo_element_if_needed(DOM::Element& element
|| pseudo_element_content.type == CSS::ContentData::Type::None)
return {};
auto pseudo_element_node = DOM::Element::create_layout_node_for_display_type(document, pseudo_element_display, pseudo_element_style, nullptr);
auto pseudo_element_node = DOM::Element::create_layout_node_for_display_type(document, pseudo_element_display, *pseudo_element_style, nullptr);
if (!pseudo_element_node)
return {};