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Remove a memory allocation (iter.collect::<Vec<_>>()) in cascade()

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This vector was there to pre-acquire locks and give all declarations
the same lifetime (which is necessary for custom properties cascading).

https://github.com/servo/servo/pull/16014 introduce a guard to a shared
pre-acquired lock, making this vector unnecessary.
This commit is contained in:
Simon Sapin 2017-04-03 11:39:10 +02:00
parent 5b037a0aa0
commit 510bcc6186
1 changed files with 18 additions and 17 deletions
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19
components/style/properties/properties.mako.rs
View file

@ -1976,19 +1976,20 @@ pub fn cascade(device: &Device,
}
};
// Hold locks until after the apply_declarations() call returns.
// Use filter_map because the root node has no style source.
let declaration_blocks = rule_node.self_and_ancestors().filter_map(|node| {
let guard = node.cascade_level().guard(guards);
node.style_source().map(|source| (source.read(guard), node.importance()))
}).collect::<Vec<_>>();
let iter_declarations = || {
declaration_blocks.iter().flat_map(|&(ref source, source_importance)| {
source.declarations().iter()
rule_node.self_and_ancestors().flat_map(|node| {
let declarations = match node.style_source() {
Some(source) => source.read(node.cascade_level().guard(guards)).declarations(),
// The root node has no style source.
None => &[]
};
let node_importance = node.importance();
declarations
.iter()
// Yield declarations later in source order (with more precedence) first.
.rev()
.filter_map(move |&(ref declaration, declaration_importance)| {
if declaration_importance == source_importance {
if declaration_importance == node_importance {
Some(declaration)
} else {
None