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style: Lazily tweak the traversal root to account for sibling invalidations.

Browse source 
Bug: 1403078
Reviewed-by: heycam
MozReview-Commit-ID: Ij3nMOKu5FO
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
This commit is contained in:
Emilio Cobos Álvarez 2017-09-26 07:25:06 +02:00
parent 1282e0d808
commit 07d55a4bf8
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GPG key ID: 056B727BB9C1027C
5 changed files with 69 additions and 63 deletions
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29
ports/geckolib/glue.rs
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@ -235,16 +235,19 @@ fn traverse_subtree(element: GeckoElement,
let global_style_data = &*GLOBAL_STYLE_DATA;
let guard = global_style_data.shared_lock.read();
let shared_style_context = create_shared_context(&global_style_data,
&guard,
&per_doc_data,
traversal_flags,
snapshots);
let shared_style_context = create_shared_context(
&global_style_data,
&guard,
&per_doc_data,
traversal_flags,
snapshots,
);
let token = RecalcStyleOnly::pre_traverse(
element,
&shared_style_context,
);
let token = RecalcStyleOnly::pre_traverse(element,
&shared_style_context,
traversal_flags);
if !token.should_traverse() {
return;
}
@ -259,13 +262,13 @@ fn traverse_subtree(element: GeckoElement,
};
let traversal = RecalcStyleOnly::new(shared_style_context);
driver::traverse_dom(&traversal, element, token, thread_pool);
driver::traverse_dom(&traversal, token, thread_pool);
}
/// Traverses the subtree rooted at `root` for restyling.
///
/// Returns whether a Gecko post-traversal (to perform lazy frame construction,
/// or consume any RestyleData, or drop any ElementData) is required.
/// Returns whether the root was restyled. Whether anything else was restyled or
/// not can be inferred from the dirty bits in the rest of the tree.
#[no_mangle]
pub extern "C" fn Servo_TraverseSubtree(
root: RawGeckoElementBorrowed,
@ -309,7 +312,9 @@ pub extern "C" fn Servo_TraverseSubtree(
element.needs_frame(),
element.borrow_data().unwrap());
element.needs_post_traversal()
let element_was_restyled =
element.borrow_data().unwrap().contains_restyle_data();
element_was_restyled
}
/// Checks whether the rule tree has crossed its threshold for unused nodes, and