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LibWeb: Don't call establishes_stacking_context() during painting

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By the time we're painting, we've already built the stacking context
tree. So instead of asking if a box establishes a stacking context, we
can ask if its paintable *has* a stacking context.

This was taking up ~6% of the profile when mousing around on the HTML
specification. With this change, it disappears completely. :^)
This commit is contained in:
Andreas Kling 2022-03-16 19:02:37 +01:00
parent e31d1620a8
commit ccc37032a4
1 changed files with 2 additions and 1 deletions
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3
Userland/Libraries/LibWeb/Painting/StackingContext.cpp
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@ -52,7 +52,8 @@ void StackingContext::paint_descendants(PaintContext& context, Layout::Node& box
}
box.for_each_child([&](auto& child) {
if (child.establishes_stacking_context())
// If `child` establishes its own stacking context, skip over it.
if (is<Layout::Box>(child) && child.paintable() && static_cast<Layout::Box const&>(child).paint_box()->stacking_context())
return;
bool child_is_inline_or_replaced = child.is_inline() || is<Layout::ReplacedBox>(child);
switch (phase) {