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style: Share CascadeData instances across ShadowRoots

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This should be both a memory and speed win for pages using a lot of
Shadow DOM.

In order to make the cache properly work we need to start keying media query
results on the actual StyleSheetContents, as that's what we share on Gecko, but
that should all be fine.

Differential Revision: https://phabricator.services.mozilla.com/D107266
This commit is contained in:
Oriol Brufau 2023-05-16 09:51:46 +02:00
parent 11153c63fa
commit 060d74ba3b
11 changed files with 175 additions and 178 deletions
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6
components/style/invalidation/media_queries.rs
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@ -8,7 +8,7 @@ use crate::context::QuirksMode;
use crate::media_queries::Device;
use crate::shared_lock::SharedRwLockReadGuard;
use crate::stylesheets::{DocumentRule, ImportRule, MediaRule};
use crate::stylesheets::{NestedRuleIterationCondition, Stylesheet, SupportsRule};
use crate::stylesheets::{NestedRuleIterationCondition, StylesheetContents, SupportsRule};
use fxhash::FxHashSet;
/// A key for a given media query result.
@ -43,13 +43,13 @@ pub trait ToMediaListKey: Sized {
}
}
impl ToMediaListKey for Stylesheet {}
impl ToMediaListKey for StylesheetContents {}
impl ToMediaListKey for ImportRule {}
impl ToMediaListKey for MediaRule {}
/// A struct that holds the result of a media query evaluation pass for the
/// media queries that evaluated successfully.
#[derive(Debug, MallocSizeOf, PartialEq)]
#[derive(Clone, Debug, MallocSizeOf, PartialEq)]
pub struct EffectiveMediaQueryResults {
/// The set of media lists that matched last time.
set: FxHashSet<MediaListKey>,