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https://github.com/servo/servo.git
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060d74ba3b
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
84 lines
2.7 KiB
Rust
84 lines
2.7 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! A set of author stylesheets and their computed representation, such as the
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//! ones used for ShadowRoot.
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use crate::dom::TElement;
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#[cfg(feature = "gecko")]
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use crate::gecko_bindings::sugar::ownership::{HasBoxFFI, HasFFI, HasSimpleFFI};
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use crate::invalidation::media_queries::ToMediaListKey;
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use crate::shared_lock::SharedRwLockReadGuard;
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use crate::stylist::Stylist;
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use crate::stylesheet_set::AuthorStylesheetSet;
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use crate::stylesheets::StylesheetInDocument;
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use crate::stylist::CascadeData;
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use servo_arc::Arc;
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/// A set of author stylesheets and their computed representation, such as the
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/// ones used for ShadowRoot.
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#[derive(MallocSizeOf)]
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pub struct AuthorStyles<S>
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where
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S: StylesheetInDocument + PartialEq + 'static,
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{
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/// The sheet collection, which holds the sheet pointers, the invalidations,
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/// and all that stuff.
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pub stylesheets: AuthorStylesheetSet<S>,
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/// The actual cascade data computed from the stylesheets.
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#[ignore_malloc_size_of = "Measured as part of the stylist"]
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pub data: Arc<CascadeData>,
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}
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lazy_static! {
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static ref EMPTY_CASCADE_DATA: Arc<CascadeData> = {
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Arc::new_leaked(CascadeData::new())
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};
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}
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impl<S> AuthorStyles<S>
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where
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S: StylesheetInDocument + PartialEq + 'static,
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{
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/// Create an empty AuthorStyles.
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#[inline]
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pub fn new() -> Self {
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Self {
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stylesheets: AuthorStylesheetSet::new(),
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data: EMPTY_CASCADE_DATA.clone(),
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}
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}
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/// Flush the pending sheet changes, updating `data` as appropriate.
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///
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/// TODO(emilio): Need a host element and a snapshot map to do invalidation
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/// properly.
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#[inline]
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pub fn flush<E>(
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&mut self,
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stylist: &mut Stylist,
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guard: &SharedRwLockReadGuard,
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) where
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E: TElement,
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S: ToMediaListKey,
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{
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let flusher = self
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.stylesheets
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.flush::<E>(/* host = */ None, /* snapshot_map = */ None);
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let result = stylist.rebuild_author_data(&self.data, flusher.sheets, guard);
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if let Ok(Some(new_data)) = result {
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self.data = new_data;
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}
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}
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}
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#[cfg(feature = "gecko")]
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unsafe impl HasFFI for AuthorStyles<crate::gecko::data::GeckoStyleSheet> {
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type FFIType = crate::gecko_bindings::structs::RawServoAuthorStyles;
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}
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#[cfg(feature = "gecko")]
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unsafe impl HasSimpleFFI for AuthorStyles<crate::gecko::data::GeckoStyleSheet> {}
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#[cfg(feature = "gecko")]
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unsafe impl HasBoxFFI for AuthorStyles<crate::gecko::data::GeckoStyleSheet> {}
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