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servo: Merge #18803 - style: more custom properties optimizations (from heycam:more-custom-prop-opts); r=emilio
These help slightly with https://bugzilla.mozilla.org/show_bug.cgi?id=1405411. Source-Repo: https://github.com/servo/servo Source-Revision: 99e15f0f03fceb97f2dd54e049fc133a7001c157 --HG-- extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear extra : subtree_revision : dc9f5bbe50ec95ccb8dcc41842ce6c93e1afc50f
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@ -507,11 +507,15 @@ impl<'a> CustomPropertiesBuilder<'a> {
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return;
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}
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if !self.value_may_affect_style(name, &specified_value) {
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return;
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}
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if self.custom_properties.is_none() {
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self.custom_properties = Some(match self.inherited {
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Some(inherited) => (**inherited).clone(),
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None => CustomPropertiesMap::new(),
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})
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});
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}
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let map = self.custom_properties.as_mut().unwrap();
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@ -525,12 +529,52 @@ impl<'a> CustomPropertiesBuilder<'a> {
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CSSWideKeyword::Initial => {
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map.remove(name);
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}
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CSSWideKeyword::Unset | // Custom properties are inherited by default.
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CSSWideKeyword::Inherit => {} // The inherited value is what we already have.
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// handled in value_may_affect_style
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CSSWideKeyword::Unset |
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CSSWideKeyword::Inherit => unreachable!(),
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}
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}
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}
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fn value_may_affect_style(
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&self,
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name: &Name,
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value: &DeclaredValue<Arc<SpecifiedValue>>
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) -> bool {
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match *value {
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DeclaredValue::CSSWideKeyword(CSSWideKeyword::Unset) |
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DeclaredValue::CSSWideKeyword(CSSWideKeyword::Inherit) => {
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// Custom properties are inherited by default. So
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// explicit 'inherit' or 'unset' means we can just use
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// any existing value in the inherited CustomPropertiesMap.
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return false;
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}
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_ => {}
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}
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let existing_value =
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self.custom_properties.as_ref().and_then(|m| m.get(name))
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.or_else(|| self.inherited.and_then(|m| m.get(name)));
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match (existing_value, value) {
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(None, &DeclaredValue::CSSWideKeyword(CSSWideKeyword::Initial)) => {
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// The initial value of a custom property is the same as it
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// not existing in the map.
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return false;
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}
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(Some(existing_value), &DeclaredValue::Value(specified_value)) => {
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// Don't bother overwriting an existing inherited value with
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// the same specified value.
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if existing_value == specified_value {
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return false;
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}
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}
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_ => {}
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}
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true
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}
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/// Returns the final map of applicable custom properties.
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///
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/// If there was any specified property, we've created a new map and now we need
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