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gfx: Avoid copying stacking contexts around so much during stacking

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context creation.
This commit is contained in:
Patrick Walton 2016-03-02 11:48:49 -08:00
parent 4233e0f163
commit 983576ebaa
1 changed files with 19 additions and 13 deletions
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32
components/layout/display_list_builder.rs
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@ -1643,18 +1643,24 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
StackingContextCreationMode::PseudoFloat
};
let mut stacking_context =
self.fragment.create_stacking_context(stacking_context_id,
&self.base,
ScrollPolicy::Scrollable,
creation_mode);
let (mut floating, mut positioned) = child_contexts.into_iter().partition(|context| {
context.context_type == StackingContextType::PseudoFloat
});
let stacking_context_index = contexts.len();
contexts.push(self.fragment.create_stacking_context(stacking_context_id,
&self.base,
ScrollPolicy::Scrollable,
creation_mode));
stacking_context.children.append(&mut floating);
contexts.push(stacking_context);
contexts.append(&mut positioned);
let mut floating = vec![];
for child_context in child_contexts.into_iter() {
if child_context.context_type == StackingContextType::PseudoFloat {
// Floating.
floating.push(child_context)
} else {
// Positioned.
contexts.push(child_context)
}
}
contexts[stacking_context_index].children = floating;
return stacking_context_id;
}
@ -1670,7 +1676,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
&self.base,
scroll_policy,
StackingContextCreationMode::InnerScrollWrapper);
inner_stacking_context.children.append(&mut child_contexts);
inner_stacking_context.children = child_contexts;
let mut outer_stacking_context = self.fragment.create_stacking_context(
stacking_context_id,
@ -1685,7 +1691,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
&self.base,
scroll_policy,
StackingContextCreationMode::Normal);
stacking_context.children.append(&mut child_contexts);
stacking_context.children = child_contexts;
stacking_context
};