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Make RestyleDamage::compute take no optional argument, delegate the handling to the caller.

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This commit is contained in:
Emilio Cobos Álvarez 2016-08-08 15:59:38 -07:00
parent 6b60383f24
commit 1c322f35a6
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GPG key ID: 056B727BB9C1027C
5 changed files with 79 additions and 65 deletions
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101
components/style/matching.rs
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@ -638,13 +638,17 @@ pub trait ElementMatchMethods : TElement {
let style = &mut node.mutate_data().unwrap().style;
let damage = {
let source =
node.existing_style_for_restyle_damage((*style).as_ref());
let damage = <<Self as TElement>::ConcreteNode as TNode>
::ConcreteRestyleDamage::compute(source, &shared_style);
damage
};
let damage =
match node.existing_style_for_restyle_damage((*style).as_ref()) {
Some(ref source) => {
<<Self as TElement>::ConcreteNode as TNode>
::ConcreteRestyleDamage::compute(source, &shared_style)
}
None => {
<<Self as TElement>::ConcreteNode as TNode>
::ConcreteRestyleDamage::rebuild_and_reflow()
}
};
let restyle_result = if shared_style.get_box().clone_display() == display::T::none {
RestyleResult::Stop
@ -713,6 +717,43 @@ pub trait MatchMethods : TNode {
}
}
fn compute_restyle_damage(&self,
old_style: Option<&Arc<ComputedValues>>,
new_style: &Arc<ComputedValues>) -> Self::ConcreteRestyleDamage {
match self.existing_style_for_restyle_damage(old_style) {
Some(ref source) => {
Self::ConcreteRestyleDamage::compute(source,
new_style)
}
None => {
// If there's no style source, two things can happen:
//
// 1. This is not an incremental restyle (old_style is none).
// In this case we can't do too much than sending
// rebuild_and_reflow.
//
// 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
// 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.
//
// 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!(new_style.get_box().clone_display() != display::T::none);
Self::ConcreteRestyleDamage::rebuild_and_reflow()
}
}
}
unsafe fn cascade_node<'a, Ctx>(&self,
context: &Ctx,
parent: Option<Self>,
@ -741,12 +782,8 @@ pub trait MatchMethods : TNode {
let mut data = &mut *data_ref;
let cloned_parent_style = ComputedValues::style_for_child_text_node(parent_style.unwrap());
let damage = {
let existing_style =
self.existing_style_for_restyle_damage(data.style.as_ref());
Self::ConcreteRestyleDamage::compute(existing_style,
&cloned_parent_style)
};
let damage =
self.compute_restyle_damage(data.style.as_ref(), &cloned_parent_style);
data.style = Some(cloned_parent_style);
@ -810,9 +847,7 @@ pub trait MatchMethods : TNode {
Some(display) if display == this_display => {
Self::ConcreteRestyleDamage::empty()
}
_ => {
Self::ConcreteRestyleDamage::rebuild_and_reflow()
}
_ => Self::ConcreteRestyleDamage::rebuild_and_reflow()
};
debug!("Short-circuiting traversal: {:?} {:?} {:?}",
@ -824,12 +859,8 @@ pub trait MatchMethods : TNode {
// Otherwise, we just compute the damage normally, and sum up the damage
// related to pseudo-elements.
let mut damage = {
let existing_style =
self.existing_style_for_restyle_damage(data.style.as_ref());
Self::ConcreteRestyleDamage::compute(existing_style, &final_style)
};
let mut damage =
self.compute_restyle_damage(data.style.as_ref(), &final_style);
data.style = Some(final_style);
@ -837,18 +868,23 @@ pub trait MatchMethods : TNode {
// effectively comparing with the old computed values (given our style
// source is the old nsStyleContext).
//
// I... don't think any difference can arise from comparing with the old
// element restyle damage vs the new one, given that we're only summing
// the changes, and any change that we could miss would already have
// been caught by the parent's change. If for some reason I'm wrong on
// this, we'd have to compare computed values in Gecko too.
// We should be diffing the old pseudo-element styles with the new ones,
// see https://bugzilla.mozilla.org/show_bug.cgi?id=1293399.
//
// For now we do the following, which preserves the old Servo behavior.
let existing_style =
self.existing_style_for_restyle_damage(data.style.as_ref());
let data_per_pseudo = &mut data.per_pseudo;
let new_style = data.style.as_ref();
debug_assert!(new_style.is_some());
let rebuild_and_reflow =
Self::ConcreteRestyleDamage::rebuild_and_reflow();
debug_assert!(existing_style.is_some() || damage == rebuild_and_reflow);
<Self::ConcreteElement as MatchAttr>::Impl::each_eagerly_cascaded_pseudo_element(|pseudo| {
let applicable_declarations_for_this_pseudo =
applicable_declarations.per_pseudo.get(&pseudo).unwrap();
@ -868,9 +904,14 @@ pub trait MatchMethods : TNode {
/* shareable = */ false,
should_animate_properties);
let new_damage =
Self::ConcreteRestyleDamage::compute(existing_style, &new_pseudo_style);
damage = damage | new_damage;
// No point in computing more damage if we're already doing all
// the work.
if damage != rebuild_and_reflow {
let new_damage =
Self::ConcreteRestyleDamage::compute(existing_style.unwrap(),
&new_pseudo_style);
damage = damage | new_damage;
}
data_per_pseudo.insert(pseudo, new_pseudo_style);
}
});