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LibWeb: Compress specificity into a 32-bit unsigned int

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Instead of storing the three-part specificy for every selector,
just mash them together into a 32-bit value instead.
This saves both space and time, and matches the behavior of other
browser engines.
This commit is contained in:
Andreas Kling 2020-06-25 16:43:49 +02:00
parent 8be74ea65c
commit 49dd4b7e8a
4 changed files with 6 additions and 68 deletions
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4
Libraries/LibWeb/CSS/StyleResolver.cpp
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@ -497,12 +497,14 @@ NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const Element& eleme
quick_sort(matching_rules, [&](MatchingRule& a, MatchingRule& b) {
auto& a_selector = a.rule->selectors()[a.selector_index];
auto& b_selector = b.rule->selectors()[b.selector_index];
auto a_specificity = a_selector.specificity();
auto b_specificity = b_selector.specificity();
if (a_selector.specificity() == b_selector.specificity()) {
if (a.style_sheet_index == b.style_sheet_index)
return a.rule_index < b.rule_index;
return a.style_sheet_index < b.style_sheet_index;
}
return a_selector.specificity() < b_selector.specificity();
return a_specificity < b_specificity;
});
for (auto& match : matching_rules) {