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gfx: Box stacking contexts to minimize memmove
traffic.
`memmove` was showing up high in the profile when concatenating and shorting display lists. This change drastically reduces the `memmove` cost in exchange for some minor additional allocation cost.
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15 changed files with 35 additions and 36 deletions
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@ -451,7 +451,7 @@ impl Flow for TableWrapperFlow {
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fn collect_stacking_contexts(&mut self,
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parent_id: StackingContextId,
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contexts: &mut Vec<StackingContext>)
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contexts: &mut Vec<Box<StackingContext>>)
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-> StackingContextId {
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self.block_flow.collect_stacking_contexts(parent_id, contexts)
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}
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