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LibWeb: Only invalidate stacking context tree for opacity/z-index change

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I came across some websites that change an elements CSS "opacity" in
their :hover selectors. That caused us to relayout on hover, which we'd
like to avoid.

With this patch, we now check if a property only affects the stacking
context tree, and if nothing layout-affecting has changed, we only
invalidate the stacking context tree, causing it to be rebuilt on next
paint or hit test.

This makes :hover { opacity: ... } rules much faster. :^)
This commit is contained in:
Andreas Kling 2022-03-21 10:58:51 +01:00
parent 59afdb959f
commit 8c88ee1165
6 changed files with 54 additions and 0 deletions
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6
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -1558,4 +1558,10 @@ void Document::decrement_number_of_things_delaying_the_load_event(Badge<Document
page->client().page_did_update_resource_count(m_number_of_things_delaying_the_load_event);
}
void Document::invalidate_stacking_context_tree()
{
if (auto* paint_box = this->paint_box())
const_cast<Painting::PaintableBox*>(paint_box)->invalidate_stacking_context();
}
}