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6e6ef513a9
For duplicate style sheets with identical content, `StylesheetContents` can be reused to avoid redundant parsing of the inline style sheets. Since duplicate stylesheets is a common case with web components, this change will significantly improve performance. Additionally, the cache hit rate of stylo's `CascadeDataCache` can now be significantly improved. When shared `StylesheetContents` is modified, copy-on-write will occur to avoid affecting other sharers. And then updates the references to `CssRule` or `PropertyDeclarationBlock` stored in the CSSOMs to ensure that modifications are made only on the new copy. Signed-off-by: sharpshooter_pt <ibluegalaxy_taoj@163.com>
112 lines
3.8 KiB
Rust
112 lines
3.8 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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use std::cell::RefCell;
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use dom_struct::dom_struct;
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use servo_arc::Arc;
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use style::shared_lock::{Locked, SharedRwLockReadGuard, ToCssWithGuard};
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use style::stylesheets::{CssRuleType, NestedDeclarationsRule};
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use crate::dom::bindings::codegen::Bindings::CSSNestedDeclarationsBinding::CSSNestedDeclarationsMethods;
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use crate::dom::bindings::inheritance::Castable;
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use crate::dom::bindings::reflector::{DomGlobal, reflect_dom_object};
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use crate::dom::bindings::root::{Dom, DomRoot, MutNullableDom};
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use crate::dom::bindings::str::DOMString;
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use crate::dom::cssrule::{CSSRule, SpecificCSSRule};
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use crate::dom::cssstyledeclaration::{CSSModificationAccess, CSSStyleDeclaration, CSSStyleOwner};
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use crate::dom::cssstylesheet::CSSStyleSheet;
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use crate::dom::window::Window;
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use crate::script_runtime::CanGc;
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#[dom_struct]
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pub(crate) struct CSSNestedDeclarations {
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cssrule: CSSRule,
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#[ignore_malloc_size_of = "Arc"]
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#[no_trace]
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nesteddeclarationsrule: RefCell<Arc<Locked<NestedDeclarationsRule>>>,
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style_decl: MutNullableDom<CSSStyleDeclaration>,
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}
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impl CSSNestedDeclarations {
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pub(crate) fn new_inherited(
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parent_stylesheet: &CSSStyleSheet,
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nesteddeclarationsrule: Arc<Locked<NestedDeclarationsRule>>,
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) -> Self {
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Self {
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cssrule: CSSRule::new_inherited(parent_stylesheet),
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nesteddeclarationsrule: RefCell::new(nesteddeclarationsrule),
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style_decl: Default::default(),
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}
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}
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#[cfg_attr(crown, allow(crown::unrooted_must_root))]
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pub(crate) fn new(
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window: &Window,
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parent_stylesheet: &CSSStyleSheet,
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nesteddeclarationsrule: Arc<Locked<NestedDeclarationsRule>>,
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can_gc: CanGc,
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) -> DomRoot<Self> {
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reflect_dom_object(
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Box::new(Self::new_inherited(
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parent_stylesheet,
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nesteddeclarationsrule,
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)),
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window,
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can_gc,
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)
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}
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pub(crate) fn update_rule(
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&self,
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nesteddeclarationsrule: Arc<Locked<NestedDeclarationsRule>>,
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guard: &SharedRwLockReadGuard,
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) {
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if let Some(ref style_decl) = self.style_decl.get() {
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style_decl
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.update_property_declaration_block(&nesteddeclarationsrule.read_with(guard).block);
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}
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*self.nesteddeclarationsrule.borrow_mut() = nesteddeclarationsrule;
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}
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}
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impl SpecificCSSRule for CSSNestedDeclarations {
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fn ty(&self) -> CssRuleType {
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CssRuleType::NestedDeclarations
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}
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fn get_css(&self) -> DOMString {
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let guard = self.cssrule.shared_lock().read();
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self.nesteddeclarationsrule
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.borrow()
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.read_with(&guard)
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.to_css_string(&guard)
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.into()
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}
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}
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impl CSSNestedDeclarationsMethods<crate::DomTypeHolder> for CSSNestedDeclarations {
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/// <https://drafts.csswg.org/css-nesting/#dom-cssnesteddeclarations-style>
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fn Style(&self, can_gc: CanGc) -> DomRoot<CSSStyleDeclaration> {
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self.style_decl.or_init(|| {
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let guard = self.cssrule.shared_lock().read();
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CSSStyleDeclaration::new(
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self.global().as_window(),
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CSSStyleOwner::CSSRule(
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Dom::from_ref(self.upcast()),
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RefCell::new(
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self.nesteddeclarationsrule
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.borrow()
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.read_with(&guard)
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.block
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.clone(),
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),
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),
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None,
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CSSModificationAccess::ReadWrite,
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can_gc,
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)
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})
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}
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}
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