Struct style::rule_cache::RuleCache

pub struct RuleCache {
    map: FxHashMap<StrongRuleNode, SmallVec<[(CachedConditions, Arc<ComputedValues>); 1]>>,
}

A TLS cache from rules matched to computed values.

Fields

map: FxHashMap<StrongRuleNode, SmallVec<[(CachedConditions, Arc<ComputedValues>); 1]>>

Implementations

impl RuleCache

pub fn new() -> Self

Creates an empty RuleCache.

fn get_rule_node_for_cache<'r>( guards: &StylesheetGuards<'_>, rule_node: Option<&'r StrongRuleNode> ) -> Option<&'r StrongRuleNode>

Walk the rule tree and return a rule node for using as the key for rule cache.

It currently skips a rule node when it is neither from a style rule, nor containing any declaration of reset property. We don’t skip style rule so that we don’t need to walk a long way in the worst case. Skipping declarations rule nodes should be enough to address common cases that rule cache would fail to share when using the rule node directly, like preshint, style attrs, and animations.

pub fn find( &self, guards: &StylesheetGuards<'_>, builder_with_early_props: &StyleBuilder<'_> ) -> Option<&ComputedValues>

Finds a node in the properties matched cache.

This needs to receive a StyleBuilder with the early properties already applied.

pub fn insert_if_possible( &mut self, guards: &StylesheetGuards<'_>, style: &Arc<ComputedValues>, pseudo: Option<&PseudoElement>, conditions: &RuleCacheConditions ) -> bool

Inserts a node into the rules cache if possible.

Returns whether the style was inserted into the cache.