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Introduce is_native_anonymous and cull style traversal of doomed native anonymous content.

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MozReview-Commit-ID: LqwmavJnqW
This commit is contained in:
Bobby Holley 2017-02-23 14:55:26 -08:00
parent e2671459cb
commit 7e3671fc4c
3 changed files with 24 additions and 0 deletions
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15
components/style/traversal.rs
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@ -182,6 +182,21 @@ pub trait DomTraversal<E: TElement> : Sync {
match node.as_element() {
None => Self::text_node_needs_traversal(node),
Some(el) => {
// If the element is native-anonymous and an ancestor frame will
// be reconstructed, the child and all its descendants will be
// destroyed. In that case, we don't need to traverse the subtree.
if el.is_native_anonymous() {
if let Some(parent) = el.parent_element() {
let parent_data = parent.borrow_data().unwrap();
if let Some(r) = parent_data.get_restyle() {
if (r.damage | r.damage_handled()).contains(RestyleDamage::reconstruct()) {
debug!("Element {:?} is in doomed NAC subtree - culling traversal", el);
return false;
}
}
}
}
// In case of animation-only traversal we need to traverse
// the element if the element has animation only dirty
// descendants bit, animation-only restyle hint or recascade.