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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>
94 lines
2.9 KiB
Rust
94 lines
2.9 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, CssRules, LayerBlockRule};
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use style_traits::ToCss;
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use crate::dom::bindings::codegen::Bindings::CSSLayerBlockRuleBinding::CSSLayerBlockRuleMethods;
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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::cssgroupingrule::CSSGroupingRule;
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use crate::dom::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 CSSLayerBlockRule {
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cssgroupingrule: CSSGroupingRule,
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#[ignore_malloc_size_of = "Arc"]
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#[no_trace]
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layerblockrule: RefCell<Arc<LayerBlockRule>>,
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}
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impl CSSLayerBlockRule {
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pub(crate) fn new_inherited(
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parent_stylesheet: &CSSStyleSheet,
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layerblockrule: Arc<LayerBlockRule>,
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) -> CSSLayerBlockRule {
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CSSLayerBlockRule {
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cssgroupingrule: CSSGroupingRule::new_inherited(parent_stylesheet),
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layerblockrule: RefCell::new(layerblockrule),
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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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layerblockrule: Arc<LayerBlockRule>,
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can_gc: CanGc,
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) -> DomRoot<CSSLayerBlockRule> {
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reflect_dom_object(
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Box::new(CSSLayerBlockRule::new_inherited(
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parent_stylesheet,
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layerblockrule,
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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 clone_rules(&self) -> Arc<Locked<CssRules>> {
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self.layerblockrule.borrow().rules.clone()
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}
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pub(crate) fn update_rule(
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&self,
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layerblockrule: Arc<LayerBlockRule>,
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guard: &SharedRwLockReadGuard,
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) {
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self.cssgroupingrule
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.update_rules(&layerblockrule.rules, guard);
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*self.layerblockrule.borrow_mut() = layerblockrule;
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}
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}
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impl SpecificCSSRule for CSSLayerBlockRule {
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fn ty(&self) -> CssRuleType {
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CssRuleType::LayerBlock
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}
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fn get_css(&self) -> DOMString {
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let guard = self.cssgroupingrule.shared_lock().read();
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self.layerblockrule.borrow().to_css_string(&guard).into()
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}
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}
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impl CSSLayerBlockRuleMethods<crate::DomTypeHolder> for CSSLayerBlockRule {
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/// <https://drafts.csswg.org/css-cascade-5/#dom-csslayerblockrule-name>
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fn Name(&self) -> DOMString {
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if let Some(name) = &self.layerblockrule.borrow().name {
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DOMString::from_string(name.to_css_string())
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} else {
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DOMString::new()
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}
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}
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}
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