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Bug 1331272: style: Unify restyle-damage display: none checks.

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They were formerly different because we used the element check to cull the
traversal.

Now this is no longer true, so we can just unify them.

Also, update a no-longer up-to-date comment on that.

MozReview-Commit-ID: FH5GH7NfI8G
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
This commit is contained in:
Emilio Cobos Álvarez 2017-01-15 22:42:40 +01:00
parent 747e130295
commit 6f3957a549
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GPG key ID: 056B727BB9C1027C
1 changed files with 15 additions and 39 deletions
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54
components/style/matching.rs
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@ -769,22 +769,23 @@ pub trait MatchMethods : TElement {
//
// 2. This is an incremental restyle, but the old display value
// is none, so there's no effective way for Gecko to get the
// style source. In this case, we could return either
// style source (which is the style context).
//
// In this case, we could return either
// RestyleDamage::empty(), in the case both displays are
// none, or rebuild_and_reflow, otherwise. The first case
// should be already handled when calling this function, so
// we can assert that the new display value is not none.
// none, or rebuild_and_reflow, otherwise.
//
// Also, this can be a text node (in which case we don't
// care of watching the new display value).
//
// Unfortunately we can't strongly assert part of this, since
// we style some nodes that in Gecko never generate a frame,
// like children of replaced content. Arguably, we shouldn't be
// styling those here, but until we implement that we'll have to
// stick without the assertions.
debug_assert!(pseudo.is_none() ||
new_style.get_box().clone_display() != display::T::none);
if let Some(old_style) = old_style {
// FIXME(emilio): This should assert the old style is
// display: none, but we still can't get an old style
// context for other stuff that should give us a style
// context source like display: contents, so we fall on the
// safe side here.
if new_style.get_box().clone_display() == display::T::none &&
old_style.get_box().clone_display() == display::T::none {
return RestyleDamage::empty();
}
}
RestyleDamage::rebuild_and_reflow()
}
}
@ -881,31 +882,6 @@ pub trait MatchMethods : TElement {
possibly_expired_animations: &mut Vec<PropertyAnimation>)
-> RestyleDamage
{
// Here we optimise the case of the style changing but both the
// previous and the new styles having display: none. In this
// case, we can always optimize the traversal, regardless of the
// restyle hint.
let this_display = new_primary.get_box().clone_display();
if this_display == display::T::none {
let old_display = old_primary.map(|old| {
old.get_box().clone_display()
});
// If display passed from none to something, then we need to reflow,
// otherwise, we don't do anything.
let damage = match old_display {
Some(display) if display == this_display => {
RestyleDamage::empty()
}
_ => RestyleDamage::rebuild_and_reflow()
};
debug!("Short-circuiting traversal: {:?} {:?} {:?}",
this_display, old_display, damage);
return damage
}
// Compute the damage and sum up the damage related to pseudo-elements.
let mut damage =
self.compute_restyle_damage(old_primary, new_primary, None);