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Hoist RestyleDamage onto TElement.

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Instead of maintaining a dummy restyle damage field for text nodes, we can just
perform the necessary parent inheritance and is_changed adjustments on the fly
in ThreadSafeLayoutNode, simplifying the requirements on the style system.

MozReview-Commit-ID: DCqiCRLsLUF
This commit is contained in:
Bobby Holley 2016-10-25 19:29:32 -07:00
parent a5cabda484
commit 1cfd5e8172
7 changed files with 72 additions and 95 deletions
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67
components/script/layout_wrapper.rs
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@ -236,41 +236,12 @@ impl<'ln> TNode for ServoLayoutNode<'ln> {
debug_assert!(self.is_text_node());
let mut data = self.get_partial_layout_data().unwrap().borrow_mut();
data.style_data.style_text_node(style);
if self.has_changed() {
data.restyle_damage = RestyleDamage::rebuild_and_reflow();
} else {
// FIXME(bholley): This is necessary to make it correct to use restyle
// damage in construct_flows_at to determine whether to reconstruct
// text nodes. Without it, we fail cascade-import-dynamic-002.htm.
//
// Long-term, We should teach layout how to correctly propagate
// style changes from elements to child text nodes so that we don't
// need to do this explicitly here. This will likely all be rolled
// into a patch where we stop styling text nodes from the style
// system and instead generate the styles on the fly during frame
// construction / repair.
let parent = self.parent_node().unwrap();
let parent_data = parent.get_partial_layout_data().unwrap().borrow();
data.restyle_damage = parent_data.restyle_damage;
}
}
fn borrow_data(&self) -> Option<AtomicRef<NodeData>> {
self.get_style_data().map(|d| d.borrow())
}
fn restyle_damage(self) -> RestyleDamage {
self.get_partial_layout_data().unwrap().borrow().restyle_damage
}
fn set_restyle_damage(self, damage: RestyleDamage) {
let mut damage = damage;
if self.has_changed() {
damage = RestyleDamage::rebuild_and_reflow();
}
self.get_partial_layout_data().unwrap().borrow_mut().restyle_damage = damage;
}
fn parent_node(&self) -> Option<ServoLayoutNode<'ln>> {
unsafe {
self.node.parent_node_ref().map(|node| self.new_with_this_lifetime(&node))
@ -300,14 +271,6 @@ impl<'ln> TNode for ServoLayoutNode<'ln> {
self.node.next_sibling_ref().map(|node| self.new_with_this_lifetime(&node))
}
}
#[inline]
fn existing_style_for_restyle_damage<'a>(&'a self,
current_cv: Option<&'a Arc<ComputedValues>>,
_pseudo_element: Option<&PseudoElement>)
-> Option<&'a Arc<ComputedValues>> {
current_cv
}
}
pub struct ServoChildrenIterator<'a> {
@ -531,6 +494,19 @@ impl<'le> TElement for ServoLayoutElement<'le> {
fn attr_equals(&self, namespace: &Namespace, attr: &Atom, val: &Atom) -> bool {
self.get_attr(namespace, attr).map_or(false, |x| x == val)
}
fn set_restyle_damage(self, damage: RestyleDamage) {
let node = self.as_node();
node.get_partial_layout_data().unwrap().borrow_mut().restyle_damage = damage;
}
#[inline]
fn existing_style_for_restyle_damage<'a>(&'a self,
current_cv: Option<&'a Arc<ComputedValues>>,
_pseudo_element: Option<&PseudoElement>)
-> Option<&'a Arc<ComputedValues>> {
current_cv
}
}
impl<'le> PartialEq for ServoLayoutElement<'le> {
@ -885,11 +861,22 @@ impl<'ln> ThreadSafeLayoutNode for ServoThreadSafeLayoutNode<'ln> {
}
fn restyle_damage(self) -> RestyleDamage {
self.node.restyle_damage()
if self.node.has_changed() {
RestyleDamage::rebuild_and_reflow()
} else if self.is_text_node() {
let parent = self.node.parent_node().unwrap();
let parent_data = parent.get_partial_layout_data().unwrap().borrow();
parent_data.restyle_damage
} else {
self.node.get_partial_layout_data().unwrap().borrow().restyle_damage
}
}
fn set_restyle_damage(self, damage: RestyleDamage) {
self.node.set_restyle_damage(damage)
fn clear_restyle_damage(self) {
if self.is_element() {
let mut data = self.node.get_partial_layout_data().unwrap().borrow_mut();
data.restyle_damage = RestyleDamage::empty();
}
}
fn can_be_fragmented(&self) -> bool {