Struct style::context::ThreadLocalStyleContext

pub struct ThreadLocalStyleContext<E: TElement> {
    pub sharing_cache: StyleSharingCache<E>,
    pub rule_cache: RuleCache,
    pub bloom_filter: StyleBloom<E>,
    pub tasks: SequentialTaskList<E>,
    pub statistics: PerThreadTraversalStatistics,
    pub stack_limit_checker: StackLimitChecker,
    pub selector_caches: SelectorCaches,
}

A thread-local style context.

This context contains data that needs to be used during restyling, but is not required to be unique among worker threads, so we create one per worker thread in order to be able to mutate it without locking.

Fields

sharing_cache: StyleSharingCache<E>

A cache to share style among siblings.

rule_cache: RuleCache

A cache from matched properties to elements that match those.

bloom_filter: StyleBloom<E>

The bloom filter used to fast-reject selector-matching.

tasks: SequentialTaskList<E>

A set of tasks to be run (on the parent thread) in sequential mode after the rest of the styling is complete. This is useful for infrequently-needed non-threadsafe operations.

It’s important that goes after the style sharing cache and the bloom filter, to ensure they’re dropped before we execute the tasks, which could create another ThreadLocalStyleContext for style computation.

statistics: PerThreadTraversalStatistics

Statistics about the traversal.

stack_limit_checker: StackLimitChecker

A checker used to ensure that parallel.rs does not recurse indefinitely even on arbitrarily deep trees. See Gecko bug 1376883.

selector_caches: SelectorCaches

Collection of caches (And cache-likes) for speeding up expensive selector matches.

Implementations

impl<E: TElement> ThreadLocalStyleContext<E>

pub fn new() -> Self

Creates a new ThreadLocalStyleContext