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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>
86 lines
2.7 KiB
Rust
86 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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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, ToCssWithGuard};
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use style::stylesheets::import_rule::ImportLayer;
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use style::stylesheets::{CssRuleType, ImportRule};
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use style_traits::ToCss;
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use crate::dom::bindings::codegen::Bindings::CSSImportRuleBinding::CSSImportRuleMethods;
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use crate::dom::bindings::reflector::reflect_dom_object;
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use crate::dom::bindings::root::DomRoot;
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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::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 CSSImportRule {
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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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import_rule: RefCell<Arc<Locked<ImportRule>>>,
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}
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impl CSSImportRule {
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fn new_inherited(
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parent_stylesheet: &CSSStyleSheet,
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import_rule: Arc<Locked<ImportRule>>,
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) -> Self {
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CSSImportRule {
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cssrule: CSSRule::new_inherited(parent_stylesheet),
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import_rule: RefCell::new(import_rule),
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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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import_rule: Arc<Locked<ImportRule>>,
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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(parent_stylesheet, import_rule)),
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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(&self, import_rule: Arc<Locked<ImportRule>>) {
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*self.import_rule.borrow_mut() = import_rule;
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}
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}
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impl SpecificCSSRule for CSSImportRule {
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fn ty(&self) -> CssRuleType {
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CssRuleType::Import
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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.import_rule
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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 CSSImportRuleMethods<crate::DomTypeHolder> for CSSImportRule {
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/// <https://drafts.csswg.org/cssom-1/#dom-cssimportrule-layername>
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fn GetLayerName(&self) -> Option<DOMString> {
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let guard = self.cssrule.shared_lock().read();
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match &self.import_rule.borrow().read_with(&guard).layer {
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ImportLayer::None => None,
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ImportLayer::Anonymous => Some(DOMString::new()),
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ImportLayer::Named(name) => Some(DOMString::from_string(name.to_css_string())),
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}
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}
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}
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