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stylo: Make TraverseSubtree cheaper in the initial styling case.

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We assert against the display: none / unstyled parent already, so there's no
need to check it here as well.
This commit is contained in:
Emilio Cobos Álvarez 2017-11-22 21:07:34 +01:00
parent a812af51d6
commit b13f62714a
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GPG key ID: 056B727BB9C1027C
1 changed files with 51 additions and 29 deletions
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80
ports/geckolib/glue.rs
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@ -228,24 +228,14 @@ fn create_shared_context<'a>(global_style_data: &GlobalStyleData,
}
}
fn traverse_subtree(element: GeckoElement,
raw_data: RawServoStyleSetBorrowed,
traversal_flags: TraversalFlags,
snapshots: &ServoElementSnapshotTable) {
// When new content is inserted in a display:none subtree, we will call into
// servo to try to style it. Detect that here and bail out.
if let Some(parent) = element.traversal_parent() {
if parent.borrow_data().map_or(true, |d| d.styles.is_display_none()) {
debug!("{:?} has unstyled parent {:?} - ignoring call to traverse_subtree", element, parent);
return;
}
}
let per_doc_data = PerDocumentStyleData::from_ffi(raw_data).borrow();
debug_assert!(!per_doc_data.stylist.stylesheets_have_changed());
let global_style_data = &*GLOBAL_STYLE_DATA;
let guard = global_style_data.shared_lock.read();
fn traverse_subtree(
element: GeckoElement,
global_style_data: &GlobalStyleData,
per_doc_data: &PerDocumentStyleDataImpl,
guard: &SharedRwLockReadGuard,
traversal_flags: TraversalFlags,
snapshots: &ServoElementSnapshotTable,
) {
let shared_style_context = create_shared_context(
&global_style_data,
&guard,
@ -295,23 +285,50 @@ pub extern "C" fn Servo_TraverseSubtree(
debug!("Servo_TraverseSubtree (flags={:?})", traversal_flags);
debug!("{:?}", ShowSubtreeData(element.as_node()));
if cfg!(debug_assertions) {
if let Some(parent) = element.traversal_parent() {
let data =
parent.borrow_data().expect("Styling element with unstyled parent");
assert!(
!data.styles.is_display_none(),
"Styling element with display: none parent"
);
}
}
let needs_animation_only_restyle =
element.has_animation_only_dirty_descendants() ||
element.has_animation_restyle_hints();
let per_doc_data = PerDocumentStyleData::from_ffi(raw_data).borrow();
debug_assert!(!per_doc_data.stylist.stylesheets_have_changed());
let global_style_data = &*GLOBAL_STYLE_DATA;
let guard = global_style_data.shared_lock.read();
let was_initial_style = element.get_data().is_none();
if needs_animation_only_restyle {
debug!("Servo_TraverseSubtree doing animation-only restyle (aodd={})",
element.has_animation_only_dirty_descendants());
traverse_subtree(element,
raw_data,
traversal_flags | TraversalFlags::AnimationOnly,
unsafe { &*snapshots });
traverse_subtree(
element,
&global_style_data,
&per_doc_data,
&guard,
traversal_flags | TraversalFlags::AnimationOnly,
unsafe { &*snapshots },
);
}
traverse_subtree(element,
raw_data,
traversal_flags,
unsafe { &*snapshots });
traverse_subtree(
element,
&global_style_data,
&per_doc_data,
&guard,
traversal_flags,
unsafe { &*snapshots },
);
debug!("Servo_TraverseSubtree complete (dd={}, aodd={}, lfcd={}, lfc={}, data={:?})",
element.has_dirty_descendants(),
@ -320,9 +337,14 @@ pub extern "C" fn Servo_TraverseSubtree(
element.needs_frame(),
element.borrow_data().unwrap());
let element_was_restyled =
element.borrow_data().unwrap().contains_restyle_data();
element_was_restyled
if was_initial_style {
debug_assert!(!element.borrow_data().unwrap().contains_restyle_data());
false
} else {
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