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Auto merge of #17688 - emilio:split-style-resolution, r=heycam,BorisChiou

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style: Split style resolution and dynamic change computation.

This is the Servo side of Mozilla bug 1379505.
This commit is contained in:
bors-servo 2017-07-12 00:28:44 -07:00 • committed by GitHub
commit 16d6dc133b
20 changed files with 5498 additions and 6388 deletions
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48
components/layout/query.rs
View file

@ -37,7 +37,7 @@ use style::selector_parser::PseudoElement;
use style_traits::ToCss; use style_traits::ToCss;
use style_traits::cursor::Cursor; use style_traits::cursor::Cursor;
use webrender_traits::ClipId; use webrender_traits::ClipId;
use wrapper::{LayoutNodeHelpers, LayoutNodeLayoutData}; use wrapper::LayoutNodeLayoutData;
/// Mutable data belonging to the LayoutThread. /// Mutable data belonging to the LayoutThread.
/// ///
@ -680,7 +680,9 @@ pub fn process_resolved_style_request<'a, N>(context: &LayoutContext,
layout_root: &mut Flow) -> String layout_root: &mut Flow) -> String
where N: LayoutNode, where N: LayoutNode,
{ {
use style::stylist::RuleInclusion;
use style::traversal::resolve_style; use style::traversal::resolve_style;
let element = node.as_element().unwrap(); let element = node.as_element().unwrap();
// We call process_resolved_style_request after performing a whole-document // We call process_resolved_style_request after performing a whole-document
@ -689,30 +691,43 @@ pub fn process_resolved_style_request<'a, N>(context: &LayoutContext,
return process_resolved_style_request_internal(node, pseudo, property, layout_root); return process_resolved_style_request_internal(node, pseudo, property, layout_root);
} }
// However, the element may be in a display:none subtree. The style system // In a display: none subtree. No pseudo-element exists.
// has a mechanism to give us that within a defined scope (after which point if pseudo.is_some() {
// it's cleared to maintained style system invariants). return String::new();
}
let mut tlc = ThreadLocalStyleContext::new(&context.style_context); let mut tlc = ThreadLocalStyleContext::new(&context.style_context);
let mut context = StyleContext { let mut context = StyleContext {
shared: &context.style_context, shared: &context.style_context,
thread_local: &mut tlc, thread_local: &mut tlc,
}; };
let mut result = None;
let ensure = |el: N::ConcreteElement| el.as_node().initialize_data(); let styles = resolve_style(&mut context, element, RuleInclusion::All);
let clear = |el: N::ConcreteElement| el.as_node().clear_data(); let style = styles.primary();
resolve_style(&mut context, element, &ensure, &clear, |_: &_| { let longhand_id = match *property {
let s = process_resolved_style_request_internal(node, pseudo, property, layout_root); PropertyId::Longhand(id) => id,
result = Some(s); // Firefox returns blank strings for the computed value of shorthands,
}); // so this should be web-compatible.
result.unwrap() PropertyId::Shorthand(_) => return String::new(),
PropertyId::Custom(ref name) => {
return style.computed_value_to_string(PropertyDeclarationId::Custom(name))
}
};
// No need to care about used values here, since we're on a display: none
// subtree, use the resolved value.
style.computed_value_to_string(PropertyDeclarationId::Longhand(longhand_id))
} }
/// The primary resolution logic, which assumes that the element is styled. /// The primary resolution logic, which assumes that the element is styled.
fn process_resolved_style_request_internal<'a, N>(requested_node: N, fn process_resolved_style_request_internal<'a, N>(
requested_node: N,
pseudo: &Option<PseudoElement>, pseudo: &Option<PseudoElement>,
property: &PropertyId, property: &PropertyId,
layout_root: &mut Flow) -> String layout_root: &mut Flow,
where N: LayoutNode, ) -> String
where
N: LayoutNode,
{ {
let layout_el = requested_node.to_threadsafe().as_element().unwrap(); let layout_el = requested_node.to_threadsafe().as_element().unwrap();
let layout_el = match *pseudo { let layout_el = match *pseudo {
@ -721,6 +736,8 @@ fn process_resolved_style_request_internal<'a, N>(requested_node: N,
Some(PseudoElement::DetailsSummary) | Some(PseudoElement::DetailsSummary) |
Some(PseudoElement::DetailsContent) | Some(PseudoElement::DetailsContent) |
Some(PseudoElement::Selection) => None, Some(PseudoElement::Selection) => None,
// FIXME(emilio): What about the other pseudos? Probably they shouldn't
// just return the element's style!
_ => Some(layout_el) _ => Some(layout_el)
}; };
@ -735,7 +752,6 @@ fn process_resolved_style_request_internal<'a, N>(requested_node: N,
}; };
let style = &*layout_el.resolved_style(); let style = &*layout_el.resolved_style();
let longhand_id = match *property { let longhand_id = match *property {
PropertyId::Longhand(id) => id, PropertyId::Longhand(id) => id,

20
components/selectors/context.rs
View file

@ -5,21 +5,6 @@
use attr::CaseSensitivity; use attr::CaseSensitivity;
use bloom::BloomFilter; use bloom::BloomFilter;
bitflags! {
/// Set of flags that determine the different kind of elements affected by
/// the selector matching process.
///
/// This is used to implement efficient sharing.
#[derive(Default)]
pub flags StyleRelations: usize {
/// Whether this element is affected by presentational hints. This is
/// computed externally (that is, in Servo).
const AFFECTED_BY_PRESENTATIONAL_HINTS = 1 << 0,
/// Whether this element has pseudo-element styles. Computed externally.
const AFFECTED_BY_PSEUDO_ELEMENTS = 1 << 1,
}
}
/// What kind of selector matching mode we should use. /// What kind of selector matching mode we should use.
/// ///
/// There are two modes of selector matching. The difference is only noticeable /// There are two modes of selector matching. The difference is only noticeable
@ -89,9 +74,6 @@ impl QuirksMode {
/// transient data that applies to only a single selector. /// transient data that applies to only a single selector.
#[derive(Clone)] #[derive(Clone)]
pub struct MatchingContext<'a> { pub struct MatchingContext<'a> {
/// Output that records certains relations between elements noticed during
/// matching (and also extended after matching).
pub relations: StyleRelations,
/// Input with the matching mode we should use when matching selectors. /// Input with the matching mode we should use when matching selectors.
pub matching_mode: MatchingMode, pub matching_mode: MatchingMode,
/// Input with the bloom filter used to fast-reject selectors. /// Input with the bloom filter used to fast-reject selectors.
@ -116,7 +98,6 @@ impl<'a> MatchingContext<'a> {
-> Self -> Self
{ {
Self { Self {
relations: StyleRelations::empty(),
matching_mode: matching_mode, matching_mode: matching_mode,
bloom_filter: bloom_filter, bloom_filter: bloom_filter,
visited_handling: VisitedHandlingMode::AllLinksUnvisited, visited_handling: VisitedHandlingMode::AllLinksUnvisited,
@ -134,7 +115,6 @@ impl<'a> MatchingContext<'a> {
-> Self -> Self
{ {
Self { Self {
relations: StyleRelations::empty(),
matching_mode: matching_mode, matching_mode: matching_mode,
bloom_filter: bloom_filter, bloom_filter: bloom_filter,
visited_handling: visited_handling, visited_handling: visited_handling,

2
components/selectors/matching.rs
View file

@ -714,8 +714,6 @@ fn matches_simple_selector<E, F>(
matches_last_child(element, flags_setter) matches_last_child(element, flags_setter)
} }
Component::Root => { Component::Root => {
// We never share styles with an element with no parent, so no point
// in creating a new StyleRelation.
element.is_root() element.is_root()
} }
Component::Empty => { Component::Empty => {

370
components/style/context.rs
View file

@ -7,7 +7,6 @@
#[cfg(feature = "servo")] use animation::Animation; #[cfg(feature = "servo")] use animation::Animation;
use animation::PropertyAnimation; use animation::PropertyAnimation;
use app_units::Au; use app_units::Au;
use arrayvec::ArrayVec;
use bloom::StyleBloom; use bloom::StyleBloom;
use cache::LRUCache; use cache::LRUCache;
use data::{EagerPseudoStyles, ElementData}; use data::{EagerPseudoStyles, ElementData};
@ -19,8 +18,8 @@ use font_metrics::FontMetricsProvider;
#[cfg(feature = "servo")] use parking_lot::RwLock; #[cfg(feature = "servo")] use parking_lot::RwLock;
use properties::ComputedValues; use properties::ComputedValues;
use rule_tree::StrongRuleNode; use rule_tree::StrongRuleNode;
use selector_parser::{EAGER_PSEUDO_COUNT, PseudoElement, SnapshotMap}; use selector_parser::{EAGER_PSEUDO_COUNT, SnapshotMap};
use selectors::matching::{ElementSelectorFlags, VisitedHandlingMode}; use selectors::matching::ElementSelectorFlags;
use shared_lock::StylesheetGuards; use shared_lock::StylesheetGuards;
use sharing::{ValidationData, StyleSharingCandidateCache}; use sharing::{ValidationData, StyleSharingCandidateCache};
use std::fmt; use std::fmt;
@ -162,36 +161,17 @@ impl<'a> SharedStyleContext<'a> {
/// within the `CurrentElementInfo`. At the end of the cascade, they are folded /// within the `CurrentElementInfo`. At the end of the cascade, they are folded
/// down into the main `ComputedValues` to reduce memory usage per element while /// down into the main `ComputedValues` to reduce memory usage per element while
/// still remaining accessible. /// still remaining accessible.
#[derive(Clone)] #[derive(Clone, Default)]
pub struct CascadeInputs { pub struct CascadeInputs {
/// The rule node representing the ordered list of rules matched for this /// The rule node representing the ordered list of rules matched for this
/// node. /// node.
rules: Option<StrongRuleNode>, pub rules: Option<StrongRuleNode>,
/// The rule node representing the ordered list of rules matched for this /// The rule node representing the ordered list of rules matched for this
/// node if visited, only computed if there's a relevant link for this /// node if visited, only computed if there's a relevant link for this
/// element. A element's "relevant link" is the element being matched if it /// element. A element's "relevant link" is the element being matched if it
/// is a link or the nearest ancestor link. /// is a link or the nearest ancestor link.
visited_rules: Option<StrongRuleNode>, pub visited_rules: Option<StrongRuleNode>,
/// The element's computed values if visited, only computed if there's a
/// relevant link for this element. A element's "relevant link" is the
/// element being matched if it is a link or the nearest ancestor link.
///
/// We also store a reference to this inside the regular ComputedValues to
/// avoid refactoring all APIs to become aware of multiple ComputedValues
/// objects.
visited_values: Option<Arc<ComputedValues>>,
}
impl Default for CascadeInputs {
fn default() -> Self {
CascadeInputs {
rules: None,
visited_rules: None,
visited_values: None,
}
}
} }
impl CascadeInputs { impl CascadeInputs {
@ -200,125 +180,8 @@ impl CascadeInputs {
CascadeInputs { CascadeInputs {
rules: style.rules.clone(), rules: style.rules.clone(),
visited_rules: style.get_visited_style().and_then(|v| v.rules.clone()), visited_rules: style.get_visited_style().and_then(|v| v.rules.clone()),
// Values will be re-cascaded if necessary, so this can be None.
visited_values: None,
} }
} }
/// Whether there are any rules. Rules will be present after unvisited
/// matching or pulled from a previous cascade if no matching is expected.
pub fn has_rules(&self) -> bool {
self.rules.is_some()
}
/// Gets a mutable reference to the rule node, if any.
pub fn get_rules_mut(&mut self) -> Option<&mut StrongRuleNode> {
self.rules.as_mut()
}
/// Gets a reference to the rule node, if any.
pub fn get_rules(&self) -> Option<&StrongRuleNode> {
self.rules.as_ref()
}
/// Gets a reference to the rule node. Panic if the element does not have
/// rule node.
pub fn rules(&self) -> &StrongRuleNode {
self.rules.as_ref().unwrap()
}
/// Sets the rule node depending on visited mode.
/// Returns whether the rules changed.
pub fn set_rules(&mut self,
visited_handling: VisitedHandlingMode,
rules: StrongRuleNode)
-> bool {
match visited_handling {
VisitedHandlingMode::AllLinksVisitedAndUnvisited => {
unreachable!("We should never try to selector match with \
AllLinksVisitedAndUnvisited");
},
VisitedHandlingMode::AllLinksUnvisited => self.set_unvisited_rules(rules),
VisitedHandlingMode::RelevantLinkVisited => self.set_visited_rules(rules),
}
}
/// Sets the unvisited rule node, and returns whether it changed.
fn set_unvisited_rules(&mut self, rules: StrongRuleNode) -> bool {
if let Some(ref old_rules) = self.rules {
if *old_rules == rules {
return false
}
}
self.rules = Some(rules);
true
}
/// Whether there are any visited rules. Visited rules will be present
/// after visited matching or pulled from a previous cascade (assuming there
/// was a relevant link at the time) if no matching is expected.
pub fn has_visited_rules(&self) -> bool {
self.visited_rules.is_some()
}
/// Gets a reference to the visited rule node, if any.
pub fn get_visited_rules(&self) -> Option<&StrongRuleNode> {
self.visited_rules.as_ref()
}
/// Gets a mutable reference to the visited rule node, if any.
pub fn get_visited_rules_mut(&mut self) -> Option<&mut StrongRuleNode> {
self.visited_rules.as_mut()
}
/// Gets a reference to the visited rule node. Panic if the element does not
/// have visited rule node.
pub fn visited_rules(&self) -> &StrongRuleNode {
self.visited_rules.as_ref().unwrap()
}
/// Sets the visited rule node, and returns whether it changed.
fn set_visited_rules(&mut self, rules: StrongRuleNode) -> bool {
if let Some(ref old_rules) = self.visited_rules {
if *old_rules == rules {
return false
}
}
self.visited_rules = Some(rules);
true
}
/// Takes the visited rule node.
pub fn take_visited_rules(&mut self) -> Option<StrongRuleNode> {
self.visited_rules.take()
}
/// Whether there are any visited values.
pub fn has_visited_values(&self) -> bool {
self.visited_values.is_some()
}
/// Gets a reference to the visited computed values. Panic if the element
/// does not have visited computed values.
pub fn visited_values(&self) -> &Arc<ComputedValues> {
self.visited_values.as_ref().unwrap()
}
/// Sets the visited computed values.
pub fn set_visited_values(&mut self, values: Arc<ComputedValues>) {
self.visited_values = Some(values);
}
/// Take the visited computed values.
pub fn take_visited_values(&mut self) -> Option<Arc<ComputedValues>> {
self.visited_values.take()
}
/// Clone the visited computed values Arc. Used to store a reference to the
/// visited values inside the regular values.
pub fn clone_visited_values(&self) -> Option<Arc<ComputedValues>> {
self.visited_values.clone()
}
} }
// We manually implement Debug for CascadeInputs so that we can avoid the // We manually implement Debug for CascadeInputs so that we can avoid the
@ -363,160 +226,9 @@ impl EagerPseudoCascadeInputs {
})) }))
} }
/// Returns whether there are any pseudo inputs. /// Returns the list of rules, if they exist.
pub fn is_empty(&self) -> bool { pub fn into_array(self) -> Option<[Option<CascadeInputs>; EAGER_PSEUDO_COUNT]> {
self.0.is_none() self.0
}
/// Returns a reference to the inputs for a given eager pseudo, if they exist.
pub fn get(&self, pseudo: &PseudoElement) -> Option<&CascadeInputs> {
debug_assert!(pseudo.is_eager());
self.0.as_ref().and_then(|p| p[pseudo.eager_index()].as_ref())
}
/// Returns a mutable reference to the inputs for a given eager pseudo, if they exist.
pub fn get_mut(&mut self, pseudo: &PseudoElement) -> Option<&mut CascadeInputs> {
debug_assert!(pseudo.is_eager());
self.0.as_mut().and_then(|p| p[pseudo.eager_index()].as_mut())
}
/// Returns true if the EagerPseudoCascadeInputs has a inputs for |pseudo|.
pub fn has(&self, pseudo: &PseudoElement) -> bool {
self.get(pseudo).is_some()
}
/// Inserts a pseudo-element. The pseudo-element must not already exist.
pub fn insert(&mut self, pseudo: &PseudoElement, inputs: CascadeInputs) {
debug_assert!(!self.has(pseudo));
if self.0.is_none() {
self.0 = Some(Default::default());
}
self.0.as_mut().unwrap()[pseudo.eager_index()] = Some(inputs);
}
/// Removes a pseudo-element inputs if they exist, and returns it.
pub fn take(&mut self, pseudo: &PseudoElement) -> Option<CascadeInputs> {
let result = match self.0.as_mut() {
None => return None,
Some(arr) => arr[pseudo.eager_index()].take(),
};
let empty = self.0.as_ref().unwrap().iter().all(|x| x.is_none());
if empty {
self.0 = None;
}
result
}
/// Returns a list of the pseudo-elements.
pub fn keys(&self) -> ArrayVec<[PseudoElement; EAGER_PSEUDO_COUNT]> {
let mut v = ArrayVec::new();
if let Some(ref arr) = self.0 {
for i in 0..EAGER_PSEUDO_COUNT {
if arr[i].is_some() {
v.push(PseudoElement::from_eager_index(i));
}
}
}
v
}
/// Adds the unvisited rule node for a given pseudo-element, which may or
/// may not exist.
///
/// Returns true if the pseudo-element is new.
fn add_unvisited_rules(&mut self,
pseudo: &PseudoElement,
rules: StrongRuleNode)
-> bool {
if let Some(mut inputs) = self.get_mut(pseudo) {
inputs.set_unvisited_rules(rules);
return false
}
let mut inputs = CascadeInputs::default();
inputs.set_unvisited_rules(rules);
self.insert(pseudo, inputs);
true
}
/// Remove the unvisited rule node for a given pseudo-element, which may or
/// may not exist. Since removing the rule node implies we don't need any
/// other data for the pseudo, take the entire pseudo if found.
///
/// Returns true if the pseudo-element was removed.
fn remove_unvisited_rules(&mut self, pseudo: &PseudoElement) -> bool {
self.take(pseudo).is_some()
}
/// Adds the visited rule node for a given pseudo-element. It is assumed to
/// already exist because unvisited inputs should have been added first.
///
/// Returns true if the pseudo-element is new. (Always false, but returns a
/// bool for parity with `add_unvisited_rules`.)
fn add_visited_rules(&mut self,
pseudo: &PseudoElement,
rules: StrongRuleNode)
-> bool {
debug_assert!(self.has(pseudo));
let mut inputs = self.get_mut(pseudo).unwrap();
inputs.set_visited_rules(rules);
false
}
/// Remove the visited rule node for a given pseudo-element, which may or
/// may not exist.
///
/// Returns true if the psuedo-element was removed. (Always false, but
/// returns a bool for parity with `remove_unvisited_rules`.)
fn remove_visited_rules(&mut self, pseudo: &PseudoElement) -> bool {
if let Some(mut inputs) = self.get_mut(pseudo) {
inputs.take_visited_rules();
}
false
}
/// Adds a rule node for a given pseudo-element, which may or may not exist.
/// The type of rule node depends on the visited mode.
///
/// Returns true if the pseudo-element is new.
pub fn add_rules(&mut self,
pseudo: &PseudoElement,
visited_handling: VisitedHandlingMode,
rules: StrongRuleNode)
-> bool {
match visited_handling {
VisitedHandlingMode::AllLinksVisitedAndUnvisited => {
unreachable!("We should never try to selector match with \
AllLinksVisitedAndUnvisited");
},
VisitedHandlingMode::AllLinksUnvisited => {
self.add_unvisited_rules(&pseudo, rules)
},
VisitedHandlingMode::RelevantLinkVisited => {
self.add_visited_rules(&pseudo, rules)
},
}
}
/// Removes a rule node for a given pseudo-element, which may or may not
/// exist. The type of rule node depends on the visited mode.
///
/// Returns true if the psuedo-element was removed.
pub fn remove_rules(&mut self,
pseudo: &PseudoElement,
visited_handling: VisitedHandlingMode)
-> bool {
match visited_handling {
VisitedHandlingMode::AllLinksVisitedAndUnvisited => {
unreachable!("We should never try to selector match with \
AllLinksVisitedAndUnvisited");
},
VisitedHandlingMode::AllLinksUnvisited => {
self.remove_unvisited_rules(&pseudo)
},
VisitedHandlingMode::RelevantLinkVisited => {
self.remove_visited_rules(&pseudo)
},
}
} }
} }
@ -530,56 +242,20 @@ impl EagerPseudoCascadeInputs {
#[derive(Clone, Debug)] #[derive(Clone, Debug)]
pub struct ElementCascadeInputs { pub struct ElementCascadeInputs {
/// The element's cascade inputs. /// The element's cascade inputs.
pub primary: Option<CascadeInputs>, pub primary: CascadeInputs,
/// A list of the inputs for the element's eagerly-cascaded pseudo-elements. /// A list of the inputs for the element's eagerly-cascaded pseudo-elements.
pub pseudos: EagerPseudoCascadeInputs, pub pseudos: EagerPseudoCascadeInputs,
} }
impl Default for ElementCascadeInputs {
/// Construct an empty `ElementCascadeInputs`.
fn default() -> Self {
ElementCascadeInputs {
primary: None,
pseudos: EagerPseudoCascadeInputs(None),
}
}
}
impl ElementCascadeInputs { impl ElementCascadeInputs {
/// Construct inputs from previous cascade results, if any. /// Construct inputs from previous cascade results, if any.
pub fn new_from_element_data(data: &ElementData) -> Self { pub fn new_from_element_data(data: &ElementData) -> Self {
if !data.has_styles() { debug_assert!(data.has_styles());
return ElementCascadeInputs::default()
}
ElementCascadeInputs { ElementCascadeInputs {
primary: Some(CascadeInputs::new_from_style(data.styles.primary())), primary: CascadeInputs::new_from_style(data.styles.primary()),
pseudos: EagerPseudoCascadeInputs::new_from_style(&data.styles.pseudos), pseudos: EagerPseudoCascadeInputs::new_from_style(&data.styles.pseudos),
} }
} }
/// Returns whether we have primary inputs.
pub fn has_primary(&self) -> bool {
self.primary.is_some()
}
/// Gets the primary inputs. Panic if unavailable.
pub fn primary(&self) -> &CascadeInputs {
self.primary.as_ref().unwrap()
}
/// Gets the mutable primary inputs. Panic if unavailable.
pub fn primary_mut(&mut self) -> &mut CascadeInputs {
self.primary.as_mut().unwrap()
}
/// Ensure primary inputs exist and create them if they do not.
/// Returns a mutable reference to the primary inputs.
pub fn ensure_primary(&mut self) -> &mut CascadeInputs {
if self.primary.is_none() {
self.primary = Some(CascadeInputs::default());
}
self.primary.as_mut().unwrap()
}
} }
/// Information about the current element being processed. We group this /// Information about the current element being processed. We group this
@ -598,11 +274,6 @@ pub struct CurrentElementInfo {
/// A Vec of possibly expired animations. Used only by Servo. /// A Vec of possibly expired animations. Used only by Servo.
#[allow(dead_code)] #[allow(dead_code)]
pub possibly_expired_animations: Vec<PropertyAnimation>, pub possibly_expired_animations: Vec<PropertyAnimation>,
/// Temporary storage for various intermediate inputs that are eventually
/// used by by the cascade. At the end of the cascade, they are folded down
/// into the main `ComputedValues` to reduce memory usage per element while
/// still remaining accessible.
pub cascade_inputs: ElementCascadeInputs,
} }
/// Statistics gathered during the traversal. We gather statistics on each /// Statistics gathered during the traversal. We gather statistics on each
@ -906,7 +577,6 @@ impl<E: TElement> ThreadLocalStyleContext<E> {
is_initial_style: !data.has_styles(), is_initial_style: !data.has_styles(),
validation_data: ValidationData::default(), validation_data: ValidationData::default(),
possibly_expired_animations: Vec::new(), possibly_expired_animations: Vec::new(),
cascade_inputs: ElementCascadeInputs::default(),
}); });
} }
@ -951,24 +621,6 @@ pub struct StyleContext<'a, E: TElement + 'a> {
pub thread_local: &'a mut ThreadLocalStyleContext<E>, pub thread_local: &'a mut ThreadLocalStyleContext<E>,
} }
impl<'a, E: TElement + 'a> StyleContext<'a, E> {
/// Returns a reference to the cascade inputs. Panics if there is no
/// `CurrentElementInfo`.
pub fn cascade_inputs(&self) -> &ElementCascadeInputs {
&self.thread_local.current_element_info
.as_ref().unwrap()
.cascade_inputs
}
/// Returns a mutable reference to the cascade inputs. Panics if there is
/// no `CurrentElementInfo`.
pub fn cascade_inputs_mut(&mut self) -> &mut ElementCascadeInputs {
&mut self.thread_local.current_element_info
.as_mut().unwrap()
.cascade_inputs
}
}
/// Why we're doing reflow. /// Why we're doing reflow.
#[derive(PartialEq, Copy, Clone, Debug)] #[derive(PartialEq, Copy, Clone, Debug)]
pub enum ReflowGoal { pub enum ReflowGoal {

43
components/style/data.rs
View file

@ -8,11 +8,11 @@ use arrayvec::ArrayVec;
use context::SharedStyleContext; use context::SharedStyleContext;
use dom::TElement; use dom::TElement;
use invalidation::element::restyle_hints::RestyleHint; use invalidation::element::restyle_hints::RestyleHint;
use properties::{AnimationRules, ComputedValues, PropertyDeclarationBlock}; use properties::ComputedValues;
use properties::longhands::display::computed_value as display; use properties::longhands::display::computed_value as display;
use rule_tree::StrongRuleNode; use rule_tree::StrongRuleNode;
use selector_parser::{EAGER_PSEUDO_COUNT, PseudoElement, RestyleDamage}; use selector_parser::{EAGER_PSEUDO_COUNT, PseudoElement, RestyleDamage};
use shared_lock::{Locked, StylesheetGuards}; use shared_lock::StylesheetGuards;
use std::ops::{Deref, DerefMut}; use std::ops::{Deref, DerefMut};
use stylearc::Arc; use stylearc::Arc;
@ -105,7 +105,7 @@ impl RestyleData {
/// not require duplicate allocations. We leverage the copy-on-write semantics of /// not require duplicate allocations. We leverage the copy-on-write semantics of
/// Arc::make_mut(), which is free (i.e. does not require atomic RMU operations) /// Arc::make_mut(), which is free (i.e. does not require atomic RMU operations)
/// in servo_arc. /// in servo_arc.
#[derive(Clone, Debug)] #[derive(Clone, Debug, Default)]
pub struct EagerPseudoStyles(Option<Arc<EagerPseudoArray>>); pub struct EagerPseudoStyles(Option<Arc<EagerPseudoArray>>);
#[derive(Debug, Default)] #[derive(Debug, Default)]
@ -234,7 +234,7 @@ impl EagerPseudoStyles {
/// The styles associated with a node, including the styles for any /// The styles associated with a node, including the styles for any
/// pseudo-elements. /// pseudo-elements.
#[derive(Clone, Debug)] #[derive(Clone, Debug, Default)]
pub struct ElementStyles { pub struct ElementStyles {
/// The element's style. /// The element's style.
pub primary: Option<Arc<ComputedValues>>, pub primary: Option<Arc<ComputedValues>>,
@ -242,16 +242,6 @@ pub struct ElementStyles {
pub pseudos: EagerPseudoStyles, pub pseudos: EagerPseudoStyles,
} }
impl Default for ElementStyles {
/// Construct an empty `ElementStyles`.
fn default() -> Self {
ElementStyles {
primary: None,
pseudos: EagerPseudoStyles(None),
}
}
}
impl ElementStyles { impl ElementStyles {
/// Returns the primary style. /// Returns the primary style.
pub fn get_primary(&self) -> Option<&Arc<ComputedValues>> { pub fn get_primary(&self) -> Option<&Arc<ComputedValues>> {
@ -412,29 +402,4 @@ impl ElementData {
pub fn clear_restyle_state(&mut self) { pub fn clear_restyle_state(&mut self) {
self.restyle.clear(); self.restyle.clear();
} }
/// Returns SMIL overriden value if exists.
pub fn get_smil_override(&self) -> Option<&Arc<Locked<PropertyDeclarationBlock>>> {
if cfg!(feature = "servo") {
// Servo has no knowledge of a SMIL rule, so just avoid looking for it.
return None;
}
match self.styles.get_primary() {
Some(v) => v.rules().get_smil_animation_rule(),
None => None,
}
}
/// Returns AnimationRules that has processed during animation-only restyles.
pub fn get_animation_rules(&self) -> AnimationRules {
if cfg!(feature = "servo") {
return AnimationRules(None, None)
}
match self.styles.get_primary() {
Some(v) => v.rules().get_animation_rules(),
None => AnimationRules(None, None),
}
}
} }

14
components/style/dom.rs
View file

@ -15,7 +15,7 @@ use data::ElementData;
use element_state::ElementState; use element_state::ElementState;
use font_metrics::FontMetricsProvider; use font_metrics::FontMetricsProvider;
use media_queries::Device; use media_queries::Device;
use properties::{ComputedValues, PropertyDeclarationBlock}; use properties::{AnimationRules, ComputedValues, PropertyDeclarationBlock};
#[cfg(feature = "gecko")] use properties::animated_properties::AnimationValue; #[cfg(feature = "gecko")] use properties::animated_properties::AnimationValue;
#[cfg(feature = "gecko")] use properties::animated_properties::TransitionProperty; #[cfg(feature = "gecko")] use properties::animated_properties::TransitionProperty;
use rule_tree::CascadeLevel; use rule_tree::CascadeLevel;
@ -379,6 +379,18 @@ pub trait TElement : Eq + PartialEq + Debug + Hash + Sized + Copy + Clone +
None None
} }
/// Get the combined animation and transition rules.
fn get_animation_rules(&self) -> AnimationRules {
if !self.may_have_animations() {
return AnimationRules(None, None)
}
AnimationRules(
self.get_animation_rule(),
self.get_transition_rule(),
)
}
/// Get this element's animation rule. /// Get this element's animation rule.
fn get_animation_rule(&self) fn get_animation_rule(&self)
-> Option<Arc<Locked<PropertyDeclarationBlock>>> { -> Option<Arc<Locked<PropertyDeclarationBlock>>> {

8
components/style/gecko/generated/atom_macro.rs
View file

@ -240,6 +240,8 @@ cfg_if! {
pub static nsGkAtoms_arrow: *mut nsIAtom; pub static nsGkAtoms_arrow: *mut nsIAtom;
#[link_name = "_ZN9nsGkAtoms7articleE"] #[link_name = "_ZN9nsGkAtoms7articleE"]
pub static nsGkAtoms_article: *mut nsIAtom; pub static nsGkAtoms_article: *mut nsIAtom;
#[link_name = "_ZN9nsGkAtoms2asE"]
pub static nsGkAtoms_as: *mut nsIAtom;
#[link_name = "_ZN9nsGkAtoms9ascendingE"] #[link_name = "_ZN9nsGkAtoms9ascendingE"]
pub static nsGkAtoms_ascending: *mut nsIAtom; pub static nsGkAtoms_ascending: *mut nsIAtom;
#[link_name = "_ZN9nsGkAtoms5asideE"] #[link_name = "_ZN9nsGkAtoms5asideE"]
@ -5367,6 +5369,8 @@ cfg_if! {
pub static nsGkAtoms_arrow: *mut nsIAtom; pub static nsGkAtoms_arrow: *mut nsIAtom;
#[link_name = "?article@nsGkAtoms@@2PEAVnsIAtom@@EA"] #[link_name = "?article@nsGkAtoms@@2PEAVnsIAtom@@EA"]
pub static nsGkAtoms_article: *mut nsIAtom; pub static nsGkAtoms_article: *mut nsIAtom;
#[link_name = "?as@nsGkAtoms@@2PEAVnsIAtom@@EA"]
pub static nsGkAtoms_as: *mut nsIAtom;
#[link_name = "?ascending@nsGkAtoms@@2PEAVnsIAtom@@EA"] #[link_name = "?ascending@nsGkAtoms@@2PEAVnsIAtom@@EA"]
pub static nsGkAtoms_ascending: *mut nsIAtom; pub static nsGkAtoms_ascending: *mut nsIAtom;
#[link_name = "?aside@nsGkAtoms@@2PEAVnsIAtom@@EA"] #[link_name = "?aside@nsGkAtoms@@2PEAVnsIAtom@@EA"]
@ -10494,6 +10498,8 @@ cfg_if! {
pub static nsGkAtoms_arrow: *mut nsIAtom; pub static nsGkAtoms_arrow: *mut nsIAtom;
#[link_name = "\x01?article@nsGkAtoms@@2PAVnsIAtom@@A"] #[link_name = "\x01?article@nsGkAtoms@@2PAVnsIAtom@@A"]
pub static nsGkAtoms_article: *mut nsIAtom; pub static nsGkAtoms_article: *mut nsIAtom;
#[link_name = "\x01?as@nsGkAtoms@@2PAVnsIAtom@@A"]
pub static nsGkAtoms_as: *mut nsIAtom;
#[link_name = "\x01?ascending@nsGkAtoms@@2PAVnsIAtom@@A"] #[link_name = "\x01?ascending@nsGkAtoms@@2PAVnsIAtom@@A"]
pub static nsGkAtoms_ascending: *mut nsIAtom; pub static nsGkAtoms_ascending: *mut nsIAtom;
#[link_name = "\x01?aside@nsGkAtoms@@2PAVnsIAtom@@A"] #[link_name = "\x01?aside@nsGkAtoms@@2PAVnsIAtom@@A"]
@ -15624,6 +15630,8 @@ macro_rules! atom {
{ unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_arrow as *mut _) } }; { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_arrow as *mut _) } };
("article") => ("article") =>
{ unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_article as *mut _) } }; { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_article as *mut _) } };
("as") =>
{ unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_as as *mut _) } };
("ascending") => ("ascending") =>
{ unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_ascending as *mut _) } }; { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_ascending as *mut _) } };
("aside") => ("aside") =>

2
components/style/gecko/generated/bindings.rs
View file

@ -2752,6 +2752,8 @@ extern "C" {
RawServoStyleSetBorrowed, RawServoStyleSetBorrowed,
element: element:
RawGeckoElementBorrowed, RawGeckoElementBorrowed,
existing_style:
ServoComputedValuesBorrowed,
snapshots: snapshots:
*const ServoElementSnapshotTable, *const ServoElementSnapshotTable,
pseudo_type: pseudo_type:

4914
components/style/gecko/generated/structs_debug.rs
View file

File diff suppressed because it is too large Load diff

4111
components/style/gecko/generated/structs_release.rs
View file

File diff suppressed because it is too large Load diff

1
components/style/lib.rs
View file

@ -123,6 +123,7 @@ pub mod selector_map;
pub mod selector_parser; pub mod selector_parser;
pub mod shared_lock; pub mod shared_lock;
pub mod sharing; pub mod sharing;
pub mod style_resolver;
pub mod stylist; pub mod stylist;
#[cfg(feature = "servo")] #[allow(unsafe_code)] pub mod servo; #[cfg(feature = "servo")] #[allow(unsafe_code)] pub mod servo;
pub mod sequential; pub mod sequential;

1242
components/style/matching.rs
View file

File diff suppressed because it is too large Load diff

6
components/style/properties/declaration_block.rs
View file

@ -28,10 +28,10 @@ use values::computed::Context;
/// ///
/// The first one is for Animation cascade level, and the second one is for /// The first one is for Animation cascade level, and the second one is for
/// Transition cascade level. /// Transition cascade level.
pub struct AnimationRules<'a>(pub Option<&'a Arc<Locked<PropertyDeclarationBlock>>>, pub struct AnimationRules(pub Option<Arc<Locked<PropertyDeclarationBlock>>>,
pub Option<&'a Arc<Locked<PropertyDeclarationBlock>>>); pub Option<Arc<Locked<PropertyDeclarationBlock>>>);
impl<'a> AnimationRules<'a> { impl AnimationRules {
/// Returns whether these animation rules represents an actual rule or not. /// Returns whether these animation rules represents an actual rule or not.
pub fn is_empty(&self) -> bool { pub fn is_empty(&self) -> bool {
self.0.is_none() && self.1.is_none() self.0.is_none() && self.1.is_none()

4
components/style/properties/properties.mako.rs
View file

@ -2576,11 +2576,11 @@ pub fn cascade(device: &Device,
flags: CascadeFlags, flags: CascadeFlags,
quirks_mode: QuirksMode) quirks_mode: QuirksMode)
-> ComputedValues { -> ComputedValues {
debug_assert_eq!(parent_style.is_some(), layout_parent_style.is_some()); debug_assert!(layout_parent_style.is_none() || parent_style.is_some());
let (inherited_style, layout_parent_style) = match parent_style { let (inherited_style, layout_parent_style) = match parent_style {
Some(parent_style) => { Some(parent_style) => {
(parent_style, (parent_style,
layout_parent_style.unwrap()) layout_parent_style.unwrap_or(parent_style))
}, },
None => { None => {
(device.default_computed_values(), (device.default_computed_values(),

50
components/style/rule_tree/mod.rs
View file

@ -9,7 +9,7 @@
use applicable_declarations::ApplicableDeclarationList; use applicable_declarations::ApplicableDeclarationList;
#[cfg(feature = "servo")] #[cfg(feature = "servo")]
use heapsize::HeapSizeOf; use heapsize::HeapSizeOf;
use properties::{AnimationRules, Importance, LonghandIdSet, PropertyDeclarationBlock}; use properties::{Importance, LonghandIdSet, PropertyDeclarationBlock};
use shared_lock::{Locked, StylesheetGuards, SharedRwLockReadGuard}; use shared_lock::{Locked, StylesheetGuards, SharedRwLockReadGuard};
use smallvec::SmallVec; use smallvec::SmallVec;
use std::io::{self, Write}; use std::io::{self, Write};
@ -150,8 +150,8 @@ impl RuleTree {
} }
/// Get the root rule node. /// Get the root rule node.
pub fn root(&self) -> StrongRuleNode { pub fn root(&self) -> &StrongRuleNode {
self.root.clone() &self.root
} }
fn dump<W: Write>(&self, guards: &StylesheetGuards, writer: &mut W) { fn dump<W: Write>(&self, guards: &StylesheetGuards, writer: &mut W) {
@ -171,11 +171,13 @@ impl RuleTree {
/// !important rules are detected and inserted into the appropriate position /// !important rules are detected and inserted into the appropriate position
/// in the rule tree. This allows selector matching to ignore importance, /// in the rule tree. This allows selector matching to ignore importance,
/// while still maintaining the appropriate cascade order in the rule tree. /// while still maintaining the appropriate cascade order in the rule tree.
pub fn insert_ordered_rules_with_important<'a, I>(&self, pub fn insert_ordered_rules_with_important<'a, I>(
&self,
iter: I, iter: I,
guards: &StylesheetGuards) guards: &StylesheetGuards
-> StrongRuleNode ) -> StrongRuleNode
where I: Iterator<Item=(StyleSource, CascadeLevel)>, where
I: Iterator<Item=(StyleSource, CascadeLevel)>,
{ {
use self::CascadeLevel::*; use self::CascadeLevel::*;
let mut current = self.root.clone(); let mut current = self.root.clone();
@ -257,11 +259,11 @@ impl RuleTree {
/// Given a list of applicable declarations, insert the rules and return the /// Given a list of applicable declarations, insert the rules and return the
/// corresponding rule node. /// corresponding rule node.
pub fn compute_rule_node(&self, pub fn compute_rule_node(
&self,
applicable_declarations: &mut ApplicableDeclarationList, applicable_declarations: &mut ApplicableDeclarationList,
guards: &StylesheetGuards) guards: &StylesheetGuards
-> StrongRuleNode ) -> StrongRuleNode {
{
let rules = applicable_declarations.drain().map(|d| d.order_and_level()); let rules = applicable_declarations.drain().map(|d| d.order_and_level());
let rule_node = self.insert_ordered_rules_with_important(rules, guards); let rule_node = self.insert_ordered_rules_with_important(rules, guards);
rule_node rule_node
@ -1321,32 +1323,6 @@ impl StrongRuleNode {
.find(|node| node.cascade_level() == CascadeLevel::SMILOverride) .find(|node| node.cascade_level() == CascadeLevel::SMILOverride)
.map(|node| node.get_animation_style()) .map(|node| node.get_animation_style())
} }
/// Returns AnimationRules that has processed during animation-only restyles.
pub fn get_animation_rules(&self) -> AnimationRules {
if cfg!(feature = "servo") {
return AnimationRules(None, None);
}
let mut animation = None;
let mut transition = None;
for node in self.self_and_ancestors()
.take_while(|node| node.cascade_level() >= CascadeLevel::Animations) {
match node.cascade_level() {
CascadeLevel::Animations => {
debug_assert!(animation.is_none());
animation = Some(node.get_animation_style())
},
CascadeLevel::Transitions => {
debug_assert!(transition.is_none());
transition = Some(node.get_animation_style())
},
_ => {},
}
}
AnimationRules(animation, transition)
}
} }
/// An iterator over a rule node and its ancestors. /// An iterator over a rule node and its ancestors.

14
components/style/sharing/mod.rs
View file

@ -75,7 +75,7 @@ use dom::{TElement, SendElement};
use matching::{ChildCascadeRequirement, MatchMethods}; use matching::{ChildCascadeRequirement, MatchMethods};
use properties::ComputedValues; use properties::ComputedValues;
use selector_parser::RestyleDamage; use selector_parser::RestyleDamage;
use selectors::matching::{ElementSelectorFlags, VisitedHandlingMode, StyleRelations}; use selectors::matching::{ElementSelectorFlags, VisitedHandlingMode};
use smallvec::SmallVec; use smallvec::SmallVec;
use std::mem; use std::mem;
use std::ops::Deref; use std::ops::Deref;
@ -494,11 +494,8 @@ impl<E: TElement> StyleSharingCandidateCache<E> {
pub fn insert_if_possible(&mut self, pub fn insert_if_possible(&mut self,
element: &E, element: &E,
style: &ComputedValues, style: &ComputedValues,
relations: StyleRelations, validation_data: ValidationData,
mut validation_data: ValidationData,
dom_depth: usize) { dom_depth: usize) {
use selectors::matching::AFFECTED_BY_PRESENTATIONAL_HINTS;
let parent = match element.traversal_parent() { let parent = match element.traversal_parent() {
Some(element) => element, Some(element) => element,
None => { None => {
@ -525,13 +522,6 @@ impl<E: TElement> StyleSharingCandidateCache<E> {
return; return;
} }
// Take advantage of the information we've learned during
// selector-matching.
if !relations.intersects(AFFECTED_BY_PRESENTATIONAL_HINTS) {
debug_assert!(validation_data.pres_hints.as_ref().map_or(true, |v| v.is_empty()));
validation_data.pres_hints = Some(SmallVec::new());
}
debug!("Inserting into cache: {:?} with parent {:?}", element, parent); debug!("Inserting into cache: {:?} with parent {:?}", element, parent);
if self.dom_depth != dom_depth { if self.dom_depth != dom_depth {

505
components/style/style_resolver.rs Normal file
View file

@ -0,0 +1,505 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Style resolution for a given element or pseudo-element.
use applicable_declarations::ApplicableDeclarationList;
use cascade_info::CascadeInfo;
use context::{CascadeInputs, ElementCascadeInputs, StyleContext};
use data::{ElementStyles, EagerPseudoStyles};
use dom::TElement;
use log::LogLevel::Trace;
use matching::{CascadeVisitedMode, MatchMethods};
use properties::{AnimationRules, CascadeFlags, ComputedValues};
use properties::{IS_ROOT_ELEMENT, PROHIBIT_DISPLAY_CONTENTS, SKIP_ROOT_AND_ITEM_BASED_DISPLAY_FIXUP};
use properties::{VISITED_DEPENDENT_ONLY, cascade};
use rule_tree::StrongRuleNode;
use selector_parser::{PseudoElement, SelectorImpl};
use selectors::matching::{ElementSelectorFlags, MatchingContext, MatchingMode, VisitedHandlingMode};
use stylearc::Arc;
use stylist::RuleInclusion;
/// A struct that takes care of resolving the style of a given element.
pub struct StyleResolverForElement<'a, 'ctx, 'le, E>
where
'ctx: 'a,
'le: 'ctx,
E: TElement + MatchMethods + 'le,
{
element: E,
context: &'a mut StyleContext<'ctx, E>,
rule_inclusion: RuleInclusion,
_marker: ::std::marker::PhantomData<&'le E>,
}
struct MatchingResults {
rule_node: StrongRuleNode,
relevant_link_found: bool,
}
/// The primary style of an element or an element-backed pseudo-element.
pub struct PrimaryStyle {
/// The style per se.
pub style: Arc<ComputedValues>,
}
fn with_default_parent_styles<E, F, R>(element: E, f: F) -> R
where
E: TElement,
F: FnOnce(Option<&ComputedValues>, Option<&ComputedValues>) -> R,
{
let parent_el = element.inheritance_parent();
let parent_data = parent_el.as_ref().and_then(|e| e.borrow_data());
let parent_style = parent_data.as_ref().map(|d| {
// Sometimes Gecko eagerly styles things without processing
// pending restyles first. In general we'd like to avoid this,
// but there can be good reasons (for example, needing to
// construct a frame for some small piece of newly-added
// content in order to do something specific with that frame,
// but not wanting to flush all of layout).
debug_assert!(cfg!(feature = "gecko") ||
parent_el.unwrap().has_current_styles(d));
d.styles.primary()
});
let mut layout_parent_el = parent_el.clone();
let layout_parent_data;
let mut layout_parent_style = parent_style;
if parent_style.map_or(false, |s| s.is_display_contents()) {
layout_parent_el = Some(layout_parent_el.unwrap().layout_parent());
layout_parent_data = layout_parent_el.as_ref().unwrap().borrow_data().unwrap();
layout_parent_style = Some(layout_parent_data.styles.primary());
}
f(parent_style.map(|s| &**s), layout_parent_style.map(|s| &**s))
}
impl<'a, 'ctx, 'le, E> StyleResolverForElement<'a, 'ctx, 'le, E>
where
'ctx: 'a,
'le: 'ctx,
E: TElement + MatchMethods + 'le,
{
/// Trivially construct a new StyleResolverForElement.
pub fn new(
element: E,
context: &'a mut StyleContext<'ctx, E>,
rule_inclusion: RuleInclusion,
) -> Self {
Self {
element,
context,
rule_inclusion,
_marker: ::std::marker::PhantomData,
}
}
/// Resolve just the style of a given element.
pub fn resolve_primary_style(
&mut self,
parent_style: Option<&ComputedValues>,
layout_parent_style: Option<&ComputedValues>,
) -> PrimaryStyle {
let primary_results =
self.match_primary(VisitedHandlingMode::AllLinksUnvisited);
let relevant_link_found = primary_results.relevant_link_found;
let visited_rules = if relevant_link_found {
let visited_matching_results =
self.match_primary(VisitedHandlingMode::RelevantLinkVisited);
Some(visited_matching_results.rule_node)
} else {
None
};
let mut visited_style = None;
let should_compute_visited_style =
relevant_link_found ||
parent_style.and_then(|s| s.get_visited_style()).is_some();
if should_compute_visited_style {
visited_style = Some(self.cascade_style(
visited_rules.as_ref(),
/* style_if_visited = */ None,
parent_style,
layout_parent_style,
CascadeVisitedMode::Visited,
/* pseudo = */ None,
));
}
let style = self.cascade_style(
Some(&primary_results.rule_node),
visited_style,
parent_style,
layout_parent_style,
CascadeVisitedMode::Unvisited,
/* pseudo = */ None,
);
PrimaryStyle { style, }
}
/// Resolve the style of a given element, and all its eager pseudo-elements.
pub fn resolve_style(
&mut self,
parent_style: Option<&ComputedValues>,
layout_parent_style: Option<&ComputedValues>,
) -> ElementStyles {
use properties::longhands::display::computed_value::T as display;
let primary_style =
self.resolve_primary_style(parent_style, layout_parent_style);
let mut pseudo_styles = EagerPseudoStyles::default();
if primary_style.style.get_box().clone_display() == display::none {
return ElementStyles {
// FIXME(emilio): Remove the Option<>.
primary: Some(primary_style.style),
pseudos: pseudo_styles,
}
}
if self.element.implemented_pseudo_element().is_none() {
let layout_parent_style_for_pseudo =
if primary_style.style.is_display_contents() {
layout_parent_style
} else {
Some(&*primary_style.style)
};
SelectorImpl::each_eagerly_cascaded_pseudo_element(|pseudo| {
let pseudo_style = self.resolve_pseudo_style(
&pseudo,
&primary_style,
layout_parent_style_for_pseudo
);
if let Some(style) = pseudo_style {
pseudo_styles.set(&pseudo, style);
}
})
}
ElementStyles {
// FIXME(emilio): Remove the Option<>.
primary: Some(primary_style.style),
pseudos: pseudo_styles,
}
}
/// Resolve an element's styles with the default inheritance parent/layout
/// parents.
pub fn resolve_style_with_default_parents(&mut self) -> ElementStyles {
with_default_parent_styles(self.element, |parent_style, layout_parent_style| {
self.resolve_style(parent_style, layout_parent_style)
})
}
/// Cascade a set of rules, using the default parent for inheritance.
pub fn cascade_style_and_visited_with_default_parents(
&mut self,
inputs: CascadeInputs,
) -> Arc<ComputedValues> {
with_default_parent_styles(self.element, |parent_style, layout_parent_style| {
self.cascade_style_and_visited(
inputs,
parent_style,
layout_parent_style,
/* pseudo = */ None
)
})
}
fn cascade_style_and_visited(
&mut self,
inputs: CascadeInputs,
parent_style: Option<&ComputedValues>,
layout_parent_style: Option<&ComputedValues>,
pseudo: Option<&PseudoElement>,
) -> Arc<ComputedValues> {
let mut style_if_visited = None;
if parent_style.map_or(false, |s| s.get_visited_style().is_some()) ||
inputs.visited_rules.is_some() {
style_if_visited = Some(self.cascade_style(
inputs.visited_rules.as_ref(),
/* style_if_visited = */ None,
parent_style,
layout_parent_style,
CascadeVisitedMode::Visited,
pseudo,
));
}
self.cascade_style(
inputs.rules.as_ref(),
style_if_visited,
parent_style,
layout_parent_style,
CascadeVisitedMode::Unvisited,
pseudo,
)
}
/// Cascade the element and pseudo-element styles with the default parents.
pub fn cascade_styles_with_default_parents(
&mut self,
inputs: ElementCascadeInputs,
) -> ElementStyles {
use properties::longhands::display::computed_value::T as display;
with_default_parent_styles(self.element, move |parent_style, layout_parent_style| {
let primary_style = PrimaryStyle {
style: self.cascade_style_and_visited(
inputs.primary,
parent_style,
layout_parent_style,
/* pseudo = */ None,
),
};
let mut pseudo_styles = EagerPseudoStyles::default();
let pseudo_array = inputs.pseudos.into_array();
if pseudo_array.is_none() ||
primary_style.style.get_box().clone_display() == display::none {
return ElementStyles {
primary: Some(primary_style.style),
pseudos: pseudo_styles,
}
}
{
let layout_parent_style_for_pseudo =
if primary_style.style.is_display_contents() {
layout_parent_style
} else {
Some(&*primary_style.style)
};
for (i, mut inputs) in pseudo_array.unwrap().iter_mut().enumerate() {
if let Some(inputs) = inputs.take() {
let pseudo = PseudoElement::from_eager_index(i);
pseudo_styles.set(
&pseudo,
self.cascade_style_and_visited(
inputs,
Some(&*primary_style.style),
layout_parent_style_for_pseudo,
Some(&pseudo),
)
)
}
}
}
ElementStyles {
primary: Some(primary_style.style),
pseudos: pseudo_styles,
}
})
}
fn resolve_pseudo_style(
&mut self,
pseudo: &PseudoElement,
originating_element_style: &PrimaryStyle,
layout_parent_style: Option<&ComputedValues>,
) -> Option<Arc<ComputedValues>> {
let rules = self.match_pseudo(
&originating_element_style.style,
pseudo,
VisitedHandlingMode::AllLinksUnvisited
);
let rules = match rules {
Some(rules) => rules,
None => return None,
};
let mut visited_rules = None;
if originating_element_style.style.get_visited_style().is_some() {
visited_rules = self.match_pseudo(
&originating_element_style.style,
pseudo,
VisitedHandlingMode::RelevantLinkVisited,
);
}
Some(self.cascade_style_and_visited(
CascadeInputs {
rules: Some(rules),
visited_rules
},
Some(&originating_element_style.style),
layout_parent_style,
Some(pseudo),
))
}
fn match_primary(
&mut self,
visited_handling: VisitedHandlingMode,
) -> MatchingResults {
debug!("Match primary for {:?}, visited: {:?}",
self.element, visited_handling);
let mut applicable_declarations = ApplicableDeclarationList::new();
let map = &mut self.context.thread_local.selector_flags;
let bloom_filter = self.context.thread_local.bloom_filter.filter();
let mut matching_context =
MatchingContext::new_for_visited(
MatchingMode::Normal,
Some(bloom_filter),
visited_handling,
self.context.shared.quirks_mode
);
let stylist = &self.context.shared.stylist;
let implemented_pseudo = self.element.implemented_pseudo_element();
{
let resolving_element = self.element;
let mut set_selector_flags = |element: &E, flags: ElementSelectorFlags| {
resolving_element.apply_selector_flags(map, element, flags);
};
// Compute the primary rule node.
stylist.push_applicable_declarations(
&self.element,
implemented_pseudo.as_ref(),
self.element.style_attribute(),
self.element.get_smil_override(),
self.element.get_animation_rules(),
self.rule_inclusion,
&mut applicable_declarations,
&mut matching_context,
&mut set_selector_flags,
);
}
// FIXME(emilio): This is a hack for animations, and should go away.
self.element.unset_dirty_style_attribute();
let relevant_link_found = matching_context.relevant_link_found;
let rule_node = stylist.rule_tree().compute_rule_node(
&mut applicable_declarations,
&self.context.shared.guards
);
if log_enabled!(Trace) {
trace!("Matched rules:");
for rn in rule_node.self_and_ancestors() {
let source = rn.style_source();
if source.is_some() {
trace!(" > {:?}", source);
}
}
}
MatchingResults { rule_node, relevant_link_found }
}
fn match_pseudo(
&mut self,
originating_element_style: &ComputedValues,
pseudo_element: &PseudoElement,
visited_handling: VisitedHandlingMode,
) -> Option<StrongRuleNode> {
debug!("Match pseudo {:?} for {:?}, visited: {:?}",
self.element, pseudo_element, visited_handling);
debug_assert!(pseudo_element.is_eager() || pseudo_element.is_lazy());
debug_assert!(self.element.implemented_pseudo_element().is_none(),
"Element pseudos can't have any other pseudo.");
let mut applicable_declarations = ApplicableDeclarationList::new();
let stylist = &self.context.shared.stylist;
if !self.element.may_generate_pseudo(pseudo_element, originating_element_style) {
return None;
}
let bloom_filter = self.context.thread_local.bloom_filter.filter();
let mut matching_context =
MatchingContext::new_for_visited(
MatchingMode::ForStatelessPseudoElement,
Some(bloom_filter),
visited_handling,
self.context.shared.quirks_mode
);
let map = &mut self.context.thread_local.selector_flags;
let resolving_element = self.element;
let mut set_selector_flags = |element: &E, flags: ElementSelectorFlags| {
resolving_element.apply_selector_flags(map, element, flags);
};
// NB: We handle animation rules for ::before and ::after when
// traversing them.
stylist.push_applicable_declarations(
&self.element,
Some(pseudo_element),
None,
None,
AnimationRules(None, None),
self.rule_inclusion,
&mut applicable_declarations,
&mut matching_context,
&mut set_selector_flags
);
if applicable_declarations.is_empty() {
return None;
}
let rule_node = stylist.rule_tree().compute_rule_node(
&mut applicable_declarations,
&self.context.shared.guards
);
Some(rule_node)
}
fn cascade_style(
&mut self,
rules: Option<&StrongRuleNode>,
style_if_visited: Option<Arc<ComputedValues>>,
mut parent_style: Option<&ComputedValues>,
layout_parent_style: Option<&ComputedValues>,
cascade_visited: CascadeVisitedMode,
pseudo: Option<&PseudoElement>,
) -> Arc<ComputedValues> {
let mut cascade_info = CascadeInfo::new();
let mut cascade_flags = CascadeFlags::empty();
if self.element.skip_root_and_item_based_display_fixup() {
cascade_flags.insert(SKIP_ROOT_AND_ITEM_BASED_DISPLAY_FIXUP);
}
if cascade_visited.visited_dependent_only() {
parent_style = parent_style.map(|s| {
s.get_visited_style().map(|s| &**s).unwrap_or(s)
});
cascade_flags.insert(VISITED_DEPENDENT_ONLY);
}
if self.element.is_native_anonymous() || pseudo.is_some() {
cascade_flags.insert(PROHIBIT_DISPLAY_CONTENTS);
} else if self.element.is_root() {
cascade_flags.insert(IS_ROOT_ELEMENT);
}
let values =
Arc::new(cascade(
self.context.shared.stylist.device(),
rules.unwrap_or(self.context.shared.stylist.rule_tree().root()),
&self.context.shared.guards,
parent_style,
layout_parent_style,
style_if_visited,
Some(&mut cascade_info),
&self.context.thread_local.font_metrics_provider,
cascade_flags,
self.context.shared.quirks_mode
));
cascade_info.finish(&self.element.as_node());
values
}
}

84
components/style/stylist.rs
View file

@ -15,19 +15,18 @@ use font_metrics::FontMetricsProvider;
use gecko_bindings::structs::{nsIAtom, StyleRuleInclusion}; use gecko_bindings::structs::{nsIAtom, StyleRuleInclusion};
use invalidation::element::invalidation_map::InvalidationMap; use invalidation::element::invalidation_map::InvalidationMap;
use invalidation::media_queries::{EffectiveMediaQueryResults, ToMediaListKey}; use invalidation::media_queries::{EffectiveMediaQueryResults, ToMediaListKey};
use matching::CascadeVisitedMode;
use media_queries::Device; use media_queries::Device;
use properties::{self, CascadeFlags, ComputedValues}; use properties::{self, CascadeFlags, ComputedValues};
use properties::{AnimationRules, PropertyDeclarationBlock}; use properties::{AnimationRules, PropertyDeclarationBlock};
#[cfg(feature = "servo")] #[cfg(feature = "servo")]
use properties::INHERIT_ALL; use properties::INHERIT_ALL;
use rule_tree::{CascadeLevel, RuleTree, StrongRuleNode, StyleSource}; use rule_tree::{CascadeLevel, RuleTree, StyleSource};
use selector_map::{SelectorMap, SelectorMapEntry}; use selector_map::{SelectorMap, SelectorMapEntry};
use selector_parser::{SelectorImpl, PseudoElement}; use selector_parser::{SelectorImpl, PseudoElement};
use selectors::attr::NamespaceConstraint; use selectors::attr::NamespaceConstraint;
use selectors::bloom::BloomFilter; use selectors::bloom::BloomFilter;
use selectors::matching::{ElementSelectorFlags, matches_selector, MatchingContext, MatchingMode}; use selectors::matching::{ElementSelectorFlags, matches_selector, MatchingContext, MatchingMode};
use selectors::matching::{VisitedHandlingMode, AFFECTED_BY_PRESENTATIONAL_HINTS}; use selectors::matching::VisitedHandlingMode;
use selectors::parser::{AncestorHashes, Combinator, Component, Selector, SelectorAndHashes}; use selectors::parser::{AncestorHashes, Combinator, Component, Selector, SelectorAndHashes};
use selectors::parser::{SelectorIter, SelectorMethods}; use selectors::parser::{SelectorIter, SelectorMethods};
use selectors::sink::Push; use selectors::sink::Push;
@ -607,13 +606,12 @@ impl Stylist {
let rule_node = match self.precomputed_pseudo_element_decls.get(pseudo) { let rule_node = match self.precomputed_pseudo_element_decls.get(pseudo) {
Some(declarations) => { Some(declarations) => {
// FIXME(emilio): When we've taken rid of the cascade we can just
// use into_iter.
self.rule_tree.insert_ordered_rules_with_important( self.rule_tree.insert_ordered_rules_with_important(
declarations.into_iter().map(|a| (a.source.clone(), a.level())), declarations.into_iter().map(|a| (a.source.clone(), a.level())),
guards) guards
)
} }
None => self.rule_tree.root(), None => self.rule_tree.root().clone(),
}; };
// NOTE(emilio): We skip calculating the proper layout parent style // NOTE(emilio): We skip calculating the proper layout parent style
@ -720,24 +718,30 @@ impl Stylist {
{ {
// We may have only visited rules in cases when we are actually // We may have only visited rules in cases when we are actually
// resolving, not probing, pseudo-element style. // resolving, not probing, pseudo-element style.
if !inputs.has_rules() && !inputs.has_visited_rules() { if inputs.rules.is_none() && inputs.visited_rules.is_none() {
return None return None
} }
// We need to compute visited values if we have visited rules or if our // We need to compute visited values if we have visited rules or if our
// parent has visited values. // parent has visited values.
let visited_values = if inputs.has_visited_rules() || parent_style.get_visited_style().is_some() { let visited_values = if inputs.visited_rules.is_some() || parent_style.get_visited_style().is_some() {
// Slightly annoying: we know that inputs has either rules or // Slightly annoying: we know that inputs has either rules or
// visited rules, but we can't do inputs.rules() up front because // visited rules, but we can't do inputs.rules() up front because
// maybe it just has visited rules, so can't unwrap_or. // maybe it just has visited rules, so can't unwrap_or.
let rule_node = match inputs.get_visited_rules() { let rule_node = match inputs.visited_rules.as_ref() {
Some(rules) => rules, Some(rules) => rules,
None => inputs.rules() None => inputs.rules.as_ref().unwrap(),
}; };
// We want to use the visited bits (if any) from our parent style as // We want to use the visited bits (if any) from our parent style as
// our parent. // our parent.
let mode = CascadeVisitedMode::Visited; let inherited_style =
let inherited_style = mode.values(parent_style); parent_style.get_visited_style().unwrap_or(&*parent_style);
// FIXME(emilio): The lack of layout_parent_style here could be
// worrying, but we're probably dropping the display fixup for
// pseudos other than before and after, so it's probably ok.
//
// (Though the flags don't indicate so!)
let computed = let computed =
properties::cascade(&self.device, properties::cascade(&self.device,
rule_node, rule_node,
@ -757,13 +761,7 @@ impl Stylist {
// We may not have non-visited rules, if we only had visited ones. In // We may not have non-visited rules, if we only had visited ones. In
// that case we want to use the root rulenode for our non-visited rules. // that case we want to use the root rulenode for our non-visited rules.
let root; let rules = inputs.rules.as_ref().unwrap_or(self.rule_tree.root());
let rules = if let Some(rules) = inputs.get_rules() {
rules
} else {
root = self.rule_tree.root();
&root
};
// Read the comment on `precomputed_values_for_pseudo` to see why it's // Read the comment on `precomputed_values_for_pseudo` to see why it's
// difficult to assert that display: contents nodes never arrive here // difficult to assert that display: contents nodes never arrive here
@ -839,7 +837,9 @@ impl Stylist {
MatchingContext::new(MatchingMode::ForStatelessPseudoElement, MatchingContext::new(MatchingMode::ForStatelessPseudoElement,
None, None,
self.quirks_mode); self.quirks_mode);
self.push_applicable_declarations(element,
self.push_applicable_declarations(
element,
Some(&pseudo), Some(&pseudo),
None, None,
None, None,
@ -847,19 +847,17 @@ impl Stylist {
rule_inclusion, rule_inclusion,
&mut declarations, &mut declarations,
&mut matching_context, &mut matching_context,
&mut set_selector_flags); &mut set_selector_flags
);
if !declarations.is_empty() { if !declarations.is_empty() {
let rule_node = self.rule_tree.insert_ordered_rules_with_important( let rule_node =
declarations.into_iter().map(|a| a.order_and_level()), self.rule_tree.compute_rule_node(&mut declarations, guards);
guards); debug_assert!(rule_node != *self.rule_tree.root());
if rule_node != self.rule_tree.root() { inputs.rules = Some(rule_node);
inputs.set_rules(VisitedHandlingMode::AllLinksUnvisited,
rule_node);
} }
};
if is_probe && !inputs.has_rules() { if is_probe && inputs.rules.is_none() {
// When probing, don't compute visited styles if we have no // When probing, don't compute visited styles if we have no
// unvisited styles. // unvisited styles.
return inputs; return inputs;
@ -886,9 +884,8 @@ impl Stylist {
self.rule_tree.insert_ordered_rules_with_important( self.rule_tree.insert_ordered_rules_with_important(
declarations.into_iter().map(|a| a.order_and_level()), declarations.into_iter().map(|a| a.order_and_level()),
guards); guards);
if rule_node != self.rule_tree.root() { if rule_node != *self.rule_tree.root() {
inputs.set_rules(VisitedHandlingMode::RelevantLinkVisited, inputs.visited_rules = Some(rule_node);
rule_node);
} }
} }
} }
@ -1148,7 +1145,6 @@ impl Stylist {
self.quirks_mode, self.quirks_mode,
flags_setter, flags_setter,
CascadeLevel::UANormal); CascadeLevel::UANormal);
debug!("UA normal: {:?}", context.relations);
if pseudo_element.is_none() && !only_default_rules { if pseudo_element.is_none() && !only_default_rules {
// Step 2: Presentational hints. // Step 2: Presentational hints.
@ -1163,12 +1159,7 @@ impl Stylist {
assert_eq!(declaration.level(), CascadeLevel::PresHints); assert_eq!(declaration.level(), CascadeLevel::PresHints);
} }
} }
// Note the existence of presentational attributes so that the
// style sharing cache can avoid re-querying them if they don't
// exist.
context.relations |= AFFECTED_BY_PRESENTATIONAL_HINTS;
} }
debug!("preshints: {:?}", context.relations);
} }
// NB: the following condition, although it may look somewhat // NB: the following condition, although it may look somewhat
@ -1188,7 +1179,6 @@ impl Stylist {
self.quirks_mode, self.quirks_mode,
flags_setter, flags_setter,
CascadeLevel::UserNormal); CascadeLevel::UserNormal);
debug!("user normal: {:?}", context.relations);
} else { } else {
debug!("skipping user rules"); debug!("skipping user rules");
} }
@ -1197,7 +1187,6 @@ impl Stylist {
let cut_off_inheritance = let cut_off_inheritance =
element.get_declarations_from_xbl_bindings(pseudo_element, element.get_declarations_from_xbl_bindings(pseudo_element,
applicable_declarations); applicable_declarations);
debug!("XBL: {:?}", context.relations);
if rule_hash_target.matches_user_and_author_rules() && !only_default_rules { if rule_hash_target.matches_user_and_author_rules() && !only_default_rules {
// Gecko skips author normal rules if cutting off inheritance. // Gecko skips author normal rules if cutting off inheritance.
@ -1211,7 +1200,6 @@ impl Stylist {
self.quirks_mode, self.quirks_mode,
flags_setter, flags_setter,
CascadeLevel::AuthorNormal); CascadeLevel::AuthorNormal);
debug!("author normal: {:?}", context.relations);
} else { } else {
debug!("skipping author normal rules due to cut off inheritance"); debug!("skipping author normal rules due to cut off inheritance");
} }
@ -1227,7 +1215,6 @@ impl Stylist {
ApplicableDeclarationBlock::from_declarations(sa.clone(), ApplicableDeclarationBlock::from_declarations(sa.clone(),
CascadeLevel::StyleAttributeNormal)); CascadeLevel::StyleAttributeNormal));
} }
debug!("style attr: {:?}", context.relations);
// Step 5: SMIL override. // Step 5: SMIL override.
// Declarations from SVG SMIL animation elements. // Declarations from SVG SMIL animation elements.
@ -1237,7 +1224,6 @@ impl Stylist {
ApplicableDeclarationBlock::from_declarations(so.clone(), ApplicableDeclarationBlock::from_declarations(so.clone(),
CascadeLevel::SMILOverride)); CascadeLevel::SMILOverride));
} }
debug!("SMIL: {:?}", context.relations);
// Step 6: Animations. // Step 6: Animations.
// The animations sheet (CSS animations, script-generated animations, // The animations sheet (CSS animations, script-generated animations,
@ -1248,7 +1234,6 @@ impl Stylist {
ApplicableDeclarationBlock::from_declarations(anim.clone(), ApplicableDeclarationBlock::from_declarations(anim.clone(),
CascadeLevel::Animations)); CascadeLevel::Animations));
} }
debug!("animation: {:?}", context.relations);
} else { } else {
debug!("skipping style attr and SMIL & animation rules"); debug!("skipping style attr and SMIL & animation rules");
} }
@ -1267,12 +1252,9 @@ impl Stylist {
ApplicableDeclarationBlock::from_declarations(anim.clone(), ApplicableDeclarationBlock::from_declarations(anim.clone(),
CascadeLevel::Transitions)); CascadeLevel::Transitions));
} }
debug!("transition: {:?}", context.relations);
} else { } else {
debug!("skipping transition rules"); debug!("skipping transition rules");
} }
debug!("push_applicable_declarations: shareable: {:?}", context.relations);
} }
/// Given an id, returns whether there might be any rules for that id in any /// Given an id, returns whether there might be any rules for that id in any
@ -1295,12 +1277,6 @@ impl Stylist {
&self.animations &self.animations
} }
/// Returns the rule root node.
#[inline]
pub fn rule_tree_root(&self) -> StrongRuleNode {
self.rule_tree.root()
}
/// Computes the match results of a given element against the set of /// Computes the match results of a given element against the set of
/// revalidation selectors. /// revalidation selectors.
pub fn match_revalidation_selectors<E, F>(&self, pub fn match_revalidation_selectors<E, F>(&self,

277
components/style/traversal.rs
View file

@ -7,12 +7,13 @@
use atomic_refcell::AtomicRefCell; use atomic_refcell::AtomicRefCell;
use context::{ElementCascadeInputs, StyleContext, SharedStyleContext}; use context::{ElementCascadeInputs, StyleContext, SharedStyleContext};
use data::{ElementData, ElementStyles}; use data::{ElementData, ElementStyles};
use dom::{DirtyDescendants, NodeInfo, OpaqueNode, TElement, TNode}; use dom::{NodeInfo, OpaqueNode, TElement, TNode};
use invalidation::element::restyle_hints::{RECASCADE_SELF, RECASCADE_DESCENDANTS, RestyleHint}; use invalidation::element::restyle_hints::{RECASCADE_SELF, RECASCADE_DESCENDANTS, RestyleHint};
use matching::{ChildCascadeRequirement, MatchMethods}; use matching::{ChildCascadeRequirement, MatchMethods};
use sharing::{StyleSharingBehavior, StyleSharingTarget}; use sharing::StyleSharingTarget;
#[cfg(feature = "servo")] use servo_config::opts;
use smallvec::SmallVec; use smallvec::SmallVec;
use style_resolver::StyleResolverForElement;
use stylist::RuleInclusion;
/// A per-traversal-level chunk of data. This is sent down by the traversal, and /// A per-traversal-level chunk of data. This is sent down by the traversal, and
/// currently only holds the dom depth for the bloom filter. /// currently only holds the dom depth for the bloom filter.
@ -41,8 +42,6 @@ bitflags! {
/// Traverse and update all elements with CSS animations since /// Traverse and update all elements with CSS animations since
/// @keyframes rules may have changed /// @keyframes rules may have changed
const FOR_CSS_RULE_CHANGES = 0x08, const FOR_CSS_RULE_CHANGES = 0x08,
/// Only include user agent style sheets when selector matching.
const FOR_DEFAULT_STYLES = 0x10,
} }
} }
@ -66,12 +65,6 @@ impl TraversalFlags {
pub fn for_css_rule_changes(&self) -> bool { pub fn for_css_rule_changes(&self) -> bool {
self.contains(FOR_CSS_RULE_CHANGES) self.contains(FOR_CSS_RULE_CHANGES)
} }
/// Returns true if the traversal is to compute the default computed styles
/// for an element.
pub fn for_default_styles(&self) -> bool {
self.contains(FOR_DEFAULT_STYLES)
}
} }
/// This structure exists to enforce that callers invoke pre_traverse, and also /// This structure exists to enforce that callers invoke pre_traverse, and also
@ -126,6 +119,8 @@ impl TraversalDriver {
#[cfg(feature = "servo")] #[cfg(feature = "servo")]
fn is_servo_nonincremental_layout() -> bool { fn is_servo_nonincremental_layout() -> bool {
use servo_config::opts;
opts::get().nonincremental_layout opts::get().nonincremental_layout
} }
@ -520,151 +515,87 @@ pub trait DomTraversal<E: TElement> : Sync {
fn is_parallel(&self) -> bool; fn is_parallel(&self) -> bool;
} }
/// Helper for the function below.
fn resolve_style_internal<E, F>(
context: &mut StyleContext<E>,
element: E, ensure_data: &F
) -> Option<E>
where E: TElement,
F: Fn(E),
{
ensure_data(element);
let mut data = element.mutate_data().unwrap();
let mut display_none_root = None;
// If the Element isn't styled, we need to compute its style.
if !data.has_styles() {
// Compute the parent style if necessary.
let parent = element.traversal_parent();
if let Some(p) = parent {
display_none_root = resolve_style_internal(context, p, ensure_data);
}
// Maintain the bloom filter. If it doesn't exist, we need to build it
// from scratch. Otherwise we just need to push the parent.
if context.thread_local.bloom_filter.is_empty() {
context.thread_local.bloom_filter.rebuild(element);
} else {
context.thread_local.bloom_filter.push(parent.unwrap());
context.thread_local.bloom_filter.assert_complete(element);
}
// Compute our style.
context.thread_local.begin_element(element, &data);
element.match_and_cascade(context,
&mut data,
StyleSharingBehavior::Disallow);
context.thread_local.end_element(element);
if !context.shared.traversal_flags.for_default_styles() {
// Conservatively mark us as having dirty descendants, since there
// might be other unstyled siblings we miss when walking straight up
// the parent chain.
//
// No need to do this if we're computing default styles, since
// resolve_default_style will want the tree to be left as it is.
unsafe { element.note_descendants::<DirtyDescendants>() };
}
}
// If we're display:none and none of our ancestors are, we're the root of a
// display:none subtree.
if display_none_root.is_none() && data.styles.is_display_none() {
display_none_root = Some(element);
}
return display_none_root
}
/// Manually resolve style by sequentially walking up the parent chain to the /// Manually resolve style by sequentially walking up the parent chain to the
/// first styled Element, ignoring pending restyles. The resolved style is made /// first styled Element, ignoring pending restyles. The resolved style is made
/// available via a callback, and can be dropped by the time this function /// available via a callback, and can be dropped by the time this function
/// returns in the display:none subtree case. /// returns in the display:none subtree case.
pub fn resolve_style<E, F, G, H>(context: &mut StyleContext<E>, element: E, pub fn resolve_style<E>(
ensure_data: &F, clear_data: &G, callback: H) context: &mut StyleContext<E>,
where E: TElement, element: E,
F: Fn(E), rule_inclusion: RuleInclusion,
G: Fn(E), ) -> ElementStyles
H: FnOnce(&ElementStyles) where
E: TElement,
{ {
use style_resolver::StyleResolverForElement;
debug_assert!(rule_inclusion == RuleInclusion::DefaultOnly ||
element.borrow_data().map_or(true, |d| !d.has_styles()),
"Why are we here?");
let mut ancestors_requiring_style_resolution = SmallVec::<[E; 16]>::new();
// Clear the bloom filter, just in case the caller is reusing TLS. // Clear the bloom filter, just in case the caller is reusing TLS.
context.thread_local.bloom_filter.clear(); context.thread_local.bloom_filter.clear();
// Resolve styles up the tree. let mut style = None;
let display_none_root = resolve_style_internal(context, element, ensure_data); let mut ancestor = element.traversal_parent();
while let Some(current) = ancestor {
// Make them available for the scope of the callback. The callee may use the if rule_inclusion == RuleInclusion::All {
// argument, or perform any other processing that requires the styles to if let Some(data) = element.borrow_data() {
// exist on the Element. if let Some(ancestor_style) = data.styles.get_primary() {
callback(&element.borrow_data().unwrap().styles); style = Some(ancestor_style.clone());
// Clear any styles in display:none subtrees or subtrees not in the
// document, to leave the tree in a valid state. For display:none subtrees,
// we leave the styles on the display:none root, but for subtrees not in the
// document, we clear styles all the way up to the root of the disconnected
// subtree.
let in_doc = element.as_node().is_in_doc();
if !in_doc || display_none_root.is_some() {
let mut curr = element;
loop {
unsafe {
curr.unset_dirty_descendants();
curr.unset_animation_only_dirty_descendants();
}
if in_doc && curr == display_none_root.unwrap() {
break; break;
} }
clear_data(curr);
curr = match curr.traversal_parent() {
Some(parent) => parent,
None => break,
};
} }
} }
ancestors_requiring_style_resolution.push(current);
ancestor = current.traversal_parent();
} }
/// Manually resolve default styles for the given Element, which are the styles if let Some(ancestor) = ancestor {
/// only taking into account user agent and user cascade levels. The resolved context.thread_local.bloom_filter.rebuild(ancestor);
/// style is made available via a callback, and will be dropped by the time this context.thread_local.bloom_filter.push(ancestor);
/// function returns. }
pub fn resolve_default_style<E, F, G, H>(
context: &mut StyleContext<E>, let mut layout_parent_style = style.clone();
element: E, while let Some(style) = layout_parent_style.take() {
ensure_data: &F, if !style.is_display_contents() {
set_data: &G, layout_parent_style = Some(style);
callback: H break;
}
ancestor = ancestor.unwrap().traversal_parent();
layout_parent_style = ancestor.map(|a| {
a.borrow_data().unwrap().styles.primary().clone()
});
}
for ancestor in ancestors_requiring_style_resolution.iter().rev() {
context.thread_local.bloom_filter.assert_complete(*ancestor);
let primary_style =
StyleResolverForElement::new(*ancestor, context, rule_inclusion)
.resolve_primary_style(
style.as_ref().map(|s| &**s),
layout_parent_style.as_ref().map(|s| &**s)
);
let is_display_contents = primary_style.style.is_display_contents();
style = Some(primary_style.style);
if !is_display_contents {
layout_parent_style = style.clone();
}
context.thread_local.bloom_filter.push(*ancestor);
}
context.thread_local.bloom_filter.assert_complete(element);
StyleResolverForElement::new(element, context, rule_inclusion)
.resolve_style(
style.as_ref().map(|s| &**s),
layout_parent_style.as_ref().map(|s| &**s)
) )
where
E: TElement,
F: Fn(E),
G: Fn(E, Option<ElementData>) -> Option<ElementData>,
H: FnOnce(&ElementStyles),
{
// Save and clear out element data from the element and its ancestors.
let mut old_data: SmallVec<[(E, Option<ElementData>); 8]> = SmallVec::new();
{
let mut e = element;
loop {
old_data.push((e, set_data(e, None)));
match e.traversal_parent() {
Some(parent) => e = parent,
None => break,
}
}
}
// Resolve styles up the tree.
resolve_style_internal(context, element, ensure_data);
// Make them available for the scope of the callback. The callee may use the
// argument, or perform any other processing that requires the styles to
// exist on the Element.
callback(&element.borrow_data().unwrap().styles);
// Swap the old element data back into the element and its ancestors.
for entry in old_data {
set_data(entry.0, entry.1);
}
} }
/// Calculates the style for a single node. /// Calculates the style for a single node.
@ -827,7 +758,8 @@ where
data.restyle.set_restyled(); data.restyle.set_restyled();
} }
match kind { let mut important_rules_changed = false;
let new_styles = match kind {
MatchAndCascade => { MatchAndCascade => {
debug_assert!(!context.shared.traversal_flags.for_animation_only(), debug_assert!(!context.shared.traversal_flags.for_animation_only(),
"MatchAndCascade shouldn't be processed during \ "MatchAndCascade shouldn't be processed during \
@ -852,36 +784,63 @@ where
context.thread_local.statistics.elements_matched += 1; context.thread_local.statistics.elements_matched += 1;
important_rules_changed = true;
// Perform the matching and cascading. // Perform the matching and cascading.
element.match_and_cascade( let new_styles =
context, StyleResolverForElement::new(element, context, RuleInclusion::All)
data, .resolve_style_with_default_parents();
StyleSharingBehavior::Allow
) // If we previously tried to match this element against the cache,
// the revalidation match results will already be cached. Otherwise
// we'll have None, and compute them later on-demand.
//
// If we do have the results, grab them here to satisfy the borrow
// checker.
let validation_data =
context.thread_local
.current_element_info
.as_mut().unwrap()
.validation_data
.take();
let dom_depth = context.thread_local.bloom_filter.matching_depth();
context.thread_local
.style_sharing_candidate_cache
.insert_if_possible(
&element,
new_styles.primary(),
validation_data,
dom_depth
);
new_styles
} }
CascadeWithReplacements(flags) => { CascadeWithReplacements(flags) => {
// Skipping full matching, load cascade inputs from previous values. // Skipping full matching, load cascade inputs from previous values.
*context.cascade_inputs_mut() = let mut cascade_inputs =
ElementCascadeInputs::new_from_element_data(data); ElementCascadeInputs::new_from_element_data(data);
let important_rules_changed = element.replace_rules(flags, context); important_rules_changed =
element.cascade_primary_and_pseudos( element.replace_rules(flags, context, &mut cascade_inputs);
context, StyleResolverForElement::new(element, context, RuleInclusion::All)
data, .cascade_styles_with_default_parents(cascade_inputs)
important_rules_changed
)
} }
CascadeOnly => { CascadeOnly => {
// Skipping full matching, load cascade inputs from previous values. // Skipping full matching, load cascade inputs from previous values.
*context.cascade_inputs_mut() = let cascade_inputs =
ElementCascadeInputs::new_from_element_data(data); ElementCascadeInputs::new_from_element_data(data);
element.cascade_primary_and_pseudos( StyleResolverForElement::new(element, context, RuleInclusion::All)
.cascade_styles_with_default_parents(cascade_inputs)
}
};
element.finish_restyle(
context, context,
data, data,
/* important_rules_changed = */ false new_styles,
important_rules_changed
) )
} }
}
}
fn preprocess_children<E, D>( fn preprocess_children<E, D>(
context: &mut StyleContext<E>, context: &mut StyleContext<E>,

97
ports/geckolib/glue.rs
View file

@ -113,8 +113,8 @@ use style::stylist::RuleInclusion;
use style::thread_state; use style::thread_state;
use style::timer::Timer; use style::timer::Timer;
use style::traversal::{ANIMATION_ONLY, DomTraversal, FOR_CSS_RULE_CHANGES, FOR_RECONSTRUCT}; use style::traversal::{ANIMATION_ONLY, DomTraversal, FOR_CSS_RULE_CHANGES, FOR_RECONSTRUCT};
use style::traversal::{FOR_DEFAULT_STYLES, TraversalDriver, TraversalFlags, UNSTYLED_CHILDREN_ONLY}; use style::traversal::{TraversalDriver, TraversalFlags, UNSTYLED_CHILDREN_ONLY};
use style::traversal::{resolve_style, resolve_default_style}; use style::traversal::resolve_style;
use style::values::{CustomIdent, KeyframesName}; use style::values::{CustomIdent, KeyframesName};
use style::values::computed::Context; use style::values::computed::Context;
use style_traits::{PARSING_MODE_DEFAULT, ToCss}; use style_traits::{PARSING_MODE_DEFAULT, ToCss};
@ -654,41 +654,69 @@ pub extern "C" fn Servo_AnimationValue_Uncompute(value: RawServoAnimationValueBo
#[no_mangle] #[no_mangle]
pub extern "C" fn Servo_StyleSet_GetBaseComputedValuesForElement(raw_data: RawServoStyleSetBorrowed, pub extern "C" fn Servo_StyleSet_GetBaseComputedValuesForElement(raw_data: RawServoStyleSetBorrowed,
element: RawGeckoElementBorrowed, element: RawGeckoElementBorrowed,
computed_values: ServoComputedValuesBorrowed,
snapshots: *const ServoElementSnapshotTable, snapshots: *const ServoElementSnapshotTable,
pseudo_type: CSSPseudoElementType) pseudo_type: CSSPseudoElementType)
-> ServoComputedValuesStrong -> ServoComputedValuesStrong
{ {
use style::matching::MatchMethods; use style::style_resolver::StyleResolverForElement;
debug_assert!(!snapshots.is_null()); debug_assert!(!snapshots.is_null());
let computed_values = ComputedValues::as_arc(&computed_values);
let rules = match computed_values.rules {
None => return computed_values.clone().into_strong(),
Some(ref rules) => rules,
};
let doc_data = PerDocumentStyleData::from_ffi(raw_data).borrow(); let doc_data = PerDocumentStyleData::from_ffi(raw_data).borrow();
let without_animations =
doc_data.stylist.rule_tree().remove_animation_rules(rules);
if without_animations == *rules {
return computed_values.clone().into_strong();
}
let element = GeckoElement(element);
let element_data = match element.borrow_data() {
Some(data) => data,
None => return computed_values.clone().into_strong(),
};
let styles = &element_data.styles;
if let Some(pseudo) = PseudoElement::from_pseudo_type(pseudo_type) {
// This style already doesn't have animations.
return styles
.pseudos
.get(&pseudo)
.expect("GetBaseComputedValuesForElement for an unexisting pseudo?")
.clone().into_strong();
}
let global_style_data = &*GLOBAL_STYLE_DATA; let global_style_data = &*GLOBAL_STYLE_DATA;
let guard = global_style_data.shared_lock.read(); let guard = global_style_data.shared_lock.read();
let shared_context = create_shared_context(&global_style_data, let shared = create_shared_context(&global_style_data,
&guard, &guard,
&doc_data, &doc_data,
TraversalFlags::empty(), TraversalFlags::empty(),
unsafe { &*snapshots }); unsafe { &*snapshots });
let element = GeckoElement(element); let mut tlc = ThreadLocalStyleContext::new(&shared);
let element_data = element.borrow_data().unwrap(); let mut context = StyleContext {
let styles = &element_data.styles; shared: &shared,
thread_local: &mut tlc,
let pseudo = PseudoElement::from_pseudo_type(pseudo_type);
let pseudos = &styles.pseudos;
let pseudo_style = match pseudo {
Some(ref p) => {
let style = pseudos.get(p);
debug_assert!(style.is_some());
style
}
None => None,
}; };
let provider = get_metrics_provider_for_product(); // This currently ignores visited styles, which seems acceptable, as
element.get_base_style(&shared_context, // existing browsers don't appear to animate visited styles.
&provider, let inputs =
styles.primary(), CascadeInputs {
pseudo_style) rules: Some(without_animations),
visited_rules: None,
};
StyleResolverForElement::new(element, &mut context, RuleInclusion::All)
.cascade_style_and_visited_with_default_parents(inputs)
.into_strong() .into_strong()
} }
@ -2769,39 +2797,20 @@ pub extern "C" fn Servo_ResolveStyleLazily(element: RawGeckoElementBorrowed,
} }
} }
let traversal_flags = match rule_inclusion {
RuleInclusion::All => TraversalFlags::empty(),
RuleInclusion::DefaultOnly => FOR_DEFAULT_STYLES,
};
// We don't have the style ready. Go ahead and compute it as necessary. // We don't have the style ready. Go ahead and compute it as necessary.
let mut result = None;
let shared = create_shared_context(&global_style_data, let shared = create_shared_context(&global_style_data,
&guard, &guard,
&data, &data,
traversal_flags, TraversalFlags::empty(),
unsafe { &*snapshots }); unsafe { &*snapshots });
let mut tlc = ThreadLocalStyleContext::new(&shared); let mut tlc = ThreadLocalStyleContext::new(&shared);
let mut context = StyleContext { let mut context = StyleContext {
shared: &shared, shared: &shared,
thread_local: &mut tlc, thread_local: &mut tlc,
}; };
let ensure = |el: GeckoElement| { unsafe { el.ensure_data(); } };
match rule_inclusion { let styles = resolve_style(&mut context, element, rule_inclusion);
RuleInclusion::All => { finish(&styles).into_strong()
let clear = |el: GeckoElement| el.clear_data();
resolve_style(&mut context, element, &ensure, &clear,
|styles| result = Some(finish(styles)));
}
RuleInclusion::DefaultOnly => {
let set_data = |el: GeckoElement, data| { unsafe { el.set_data(data) } };
resolve_default_style(&mut context, element, &ensure, &set_data,
|styles| result = Some(finish(styles)));
}
}
result.unwrap().into_strong()
} }
#[cfg(feature = "gecko_debug")] #[cfg(feature = "gecko_debug")]