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style: Add infrastructure for non-eagerly-cascaded pseudo-elements

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This commit also removes StylistWrapper and uses Arc::get_mut instead.
This commit is contained in:
Emilio Cobos Álvarez 2016-04-22 16:05:41 +02:00
parent 2dacbc6fb3
commit b6402a81d0
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GPG key ID: 056B727BB9C1027C
11 changed files with 188 additions and 78 deletions
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102
components/style/selector_matching.rs
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@ -8,8 +8,9 @@
use dom::TElement;
use element_state::*;
use error_reporting::{ParseErrorReporter, StdoutErrorReporter};
use euclid::Size2D;
use media_queries::{Device, MediaType};
use properties::{PropertyDeclaration, PropertyDeclarationBlock};
use properties::{self, ComputedValues, PropertyDeclaration, PropertyDeclarationBlock};
use restyle_hints::{ElementSnapshot, RestyleHint, DependencySet};
use selector_impl::{SelectorImplExt, ServoSelectorImpl};
use selectors::Element;
@ -83,6 +84,25 @@ lazy_static! {
};
}
#[derive(HeapSizeOf)]
pub struct PrecomputedStyleData<Impl: SelectorImpl, Computed: ComputedValues> {
/// Computed values for a given non-eagerly cascaded pseudo-element. These
/// are eagerly computed once, and then just looked up in the table,
/// since they only appear in rules of the form *|*::pseudo-element
pub non_eagerly_cascaded_pseudo_elements: HashMap<Impl::PseudoElement,
Computed,
BuildHasherDefault<::fnv::FnvHasher>>,
}
impl<Impl, Computed> PrecomputedStyleData<Impl, Computed>
where Impl: SelectorImpl, Computed: ComputedValues {
fn new() -> Self {
PrecomputedStyleData {
non_eagerly_cascaded_pseudo_elements: HashMap::with_hasher(Default::default()),
}
}
}
/// This structure holds all the selectors and device characteristics
/// for a given document. The selectors are converted into `Rule`s
/// (defined in rust-selectors), and introduced in a `SelectorMap`
@ -116,11 +136,18 @@ pub struct Stylist<Impl: SelectorImplExt> {
/// The current selector maps, after evaluating media
/// rules against the current device.
element_map: PerPseudoElementSelectorMap<Impl>,
/// The selector maps corresponding to a given pseudo-element
/// (depending on the implementation)
pseudos_map: HashMap<Impl::PseudoElement,
PerPseudoElementSelectorMap<Impl>,
BuildHasherDefault<::fnv::FnvHasher>>,
/// Precomputed data to be shared to the nodes.
/// Note that this has to be an Arc, since the layout thread needs the
/// stylist mutable.
precomputed: Arc<PrecomputedStyleData<Impl, Impl::ComputedValues>>,
rules_source_order: usize,
/// Selector dependencies used to compute restyle hints.
@ -138,6 +165,7 @@ impl<Impl: SelectorImplExt> Stylist<Impl> {
element_map: PerPseudoElementSelectorMap::new(),
pseudos_map: HashMap::with_hasher(Default::default()),
precomputed: Arc::new(PrecomputedStyleData::new()),
rules_source_order: 0,
state_deps: DependencySet::new(),
};
@ -160,6 +188,7 @@ impl<Impl: SelectorImplExt> Stylist<Impl> {
self.element_map = PerPseudoElementSelectorMap::new();
self.pseudos_map = HashMap::with_hasher(Default::default());
self.precomputed = Arc::new(PrecomputedStyleData::new());
self.rules_source_order = 0;
self.state_deps.clear();
@ -182,8 +211,7 @@ impl<Impl: SelectorImplExt> Stylist<Impl> {
}
fn add_stylesheet(&mut self, stylesheet: &Stylesheet<Impl>) {
let device = &self.device;
if !stylesheet.is_effective_for_device(device) {
if !stylesheet.is_effective_for_device(&self.device) {
return;
}
let mut rules_source_order = self.rules_source_order;
@ -195,20 +223,21 @@ impl<Impl: SelectorImplExt> Stylist<Impl> {
if !$style_rule.declarations.$priority.is_empty() {
for selector in &$style_rule.selectors {
let map = if let Some(ref pseudo) = selector.pseudo_element {
self.pseudos_map.entry(pseudo.clone())
.or_insert_with(PerPseudoElementSelectorMap::new)
.borrow_for_origin(&stylesheet.origin)
self.pseudos_map
.entry(pseudo.clone())
.or_insert_with(PerPseudoElementSelectorMap::new)
.borrow_for_origin(&stylesheet.origin)
} else {
self.element_map.borrow_for_origin(&stylesheet.origin)
};
map.$priority.insert(Rule {
selector: selector.compound_selectors.clone(),
declarations: DeclarationBlock {
specificity: selector.specificity,
declarations: $style_rule.declarations.$priority.clone(),
source_order: rules_source_order,
},
selector: selector.compound_selectors.clone(),
declarations: DeclarationBlock {
specificity: selector.specificity,
declarations: $style_rule.declarations.$priority.clone(),
source_order: rules_source_order,
},
});
}
}
@ -223,7 +252,46 @@ impl<Impl: SelectorImplExt> Stylist<Impl> {
self.state_deps.note_selector(selector.compound_selectors.clone());
}
}
self.rules_source_order = rules_source_order;
Impl::each_non_eagerly_cascaded_pseudo_element(|pseudo| {
// TODO: Don't precompute this, and compute it on demand instead
// This is actually kind of hard, because the stylist is shared
// between threads.
//
if let Some(map) = self.pseudos_map.get(&pseudo) {
let mut precomputed = Arc::get_mut(&mut self.precomputed)
.expect("Stylist was not the single owner of PrecomputedStyleData");
let mut declarations = vec![];
map.user_agent.normal.get_universal_rules(&mut declarations);
map.user_agent.important.get_universal_rules(&mut declarations);
// NB: Viewport size shouldn't matter since these rules should
// be absolute.
let (computed, _) =
properties::cascade::<Impl::ComputedValues>(Size2D::zero(),
&declarations, false,
None, None,
box StdoutErrorReporter);
precomputed.non_eagerly_cascaded_pseudo_elements.insert(pseudo, computed);
}
})
}
pub fn get_precomputed_data(&self) -> &Arc<PrecomputedStyleData<Impl, Impl::ComputedValues>> {
&self.precomputed
}
pub fn get_non_eagerly_cascaded_pseudo_element_style(&self,
pseudo: &Impl::PseudoElement) -> Option<Impl::ComputedValues> {
debug_assert!(!Impl::is_eagerly_cascaded_pseudo_element(pseudo));
self.precomputed
.non_eagerly_cascaded_pseudo_elements
.get(pseudo).map(|computed| computed.clone())
}
pub fn compute_restyle_hint<E>(&self, element: &E,
@ -284,20 +352,16 @@ impl<Impl: SelectorImplExt> Stylist<Impl> {
assert!(!self.is_device_dirty);
assert!(style_attribute.is_none() || pseudo_element.is_none(),
"Style attributes do not apply to pseudo-elements");
debug_assert!(pseudo_element.is_none() ||
Impl::is_eagerly_cascaded_pseudo_element(pseudo_element.as_ref().unwrap()));
let map = match pseudo_element {
Some(ref pseudo) => match self.pseudos_map.get(pseudo) {
Some(map) => map,
// TODO(emilio): get non eagerly-cascaded pseudo-element rules here.
// Actually assume there are no rules applicable.
None => return true,
},
Some(ref pseudo) => self.pseudos_map.get(pseudo).unwrap(),
None => &self.element_map,
};
let mut shareable = true;
// Step 1: Normal user-agent rules.
map.user_agent.normal.get_all_matching_rules(element,
parent_bf,