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Hoist some work out of the tail of compute_style into the caller.

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This is really part of the "recalc" rather than the "compute" work. But more to
the point, it lets us early-return on the style-sharing stuff (see the next patch).
This commit is contained in:
Bobby Holley 2017-02-08 12:47:45 -08:00
parent 401a55e172
commit 095265affe
1 changed files with 14 additions and 18 deletions
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32
components/style/traversal.rs
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@ -428,7 +428,18 @@ pub fn recalc_style_at<E, D>(traversal: &D,
// Compute style for this element if necessary.
if compute_self {
inherited_style_changed = compute_style(traversal, traversal_data, context, element, &mut data);
compute_style(traversal, traversal_data, context, element, &mut data);
// If we're restyling this element to display:none, throw away all style
// data in the subtree, notify the caller to early-return.
let display_none = data.styles().is_display_none();
if display_none {
debug!("New element style is display:none - clearing data from descendants.");
clear_descendant_data(element, &|e| unsafe { D::clear_element_data(&e) });
}
// FIXME(bholley): Compute this accurately from the call to CalcStyleDifference.
inherited_style_changed = true;
}
// Now that matching and cascading is done, clear the bits corresponding to
@ -452,7 +463,7 @@ pub fn recalc_style_at<E, D>(traversal: &D,
// Make sure the dirty descendants bit is not set for the root of a
// display:none subtree, even if the style didn't change (since, if
// the style did change, we'd have already cleared it in compute_style).
// the style did change, we'd have already cleared it above).
//
// This keeps the tree in a valid state without requiring the DOM to
// check display:none on the parent when inserting new children (which
@ -464,13 +475,11 @@ pub fn recalc_style_at<E, D>(traversal: &D,
}
}
// Computes style, returning true if the inherited styles changed for this
// element.
fn compute_style<E, D>(_traversal: &D,
traversal_data: &mut PerLevelTraversalData,
context: &mut StyleContext<E>,
element: E,
mut data: &mut AtomicRefMut<ElementData>) -> bool
mut data: &mut AtomicRefMut<ElementData>)
where E: TElement,
D: DomTraversal<E>,
{
@ -546,19 +555,6 @@ fn compute_style<E, D>(_traversal: &D,
match_results.relations);
}
}
// If we're restyling this element to display:none, throw away all style data
// in the subtree, notify the caller to early-return.
let display_none = data.styles().is_display_none();
if display_none {
debug!("New element style is display:none - clearing data from descendants.");
clear_descendant_data(element, &|e| unsafe { D::clear_element_data(&e) });
}
// FIXME(bholley): Compute this accurately from the call to CalcStyleDifference.
let inherited_styles_changed = true;
inherited_styles_changed
}
fn preprocess_children<E, D>(traversal: &D,