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layout: Don't call establishes_stacking_context() so much.

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That function is expensive because it has to check a lot.
This commit is contained in:
Patrick Walton 2016-03-02 15:41:02 -08:00
parent dd5c574d7f
commit 72a52e23e0
2 changed files with 25 additions and 11 deletions
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23
components/layout/block.rs
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@ -1622,14 +1622,18 @@ impl BlockFlow {
}
}
pub fn establishes_pseudo_stacking_context(&self) -> bool {
pub fn block_stacking_context_type(&self) -> BlockStackingContextType {
if self.fragment.establishes_stacking_context() {
return false;
return BlockStackingContextType::StackingContext
}
self.base.flags.contains(IS_ABSOLUTELY_POSITIONED) ||
self.fragment.style.get_box().position != position::T::static_ ||
self.base.flags.is_float()
if self.base.flags.contains(IS_ABSOLUTELY_POSITIONED) ||
self.fragment.style.get_box().position != position::T::static_ ||
self.base.flags.is_float() {
BlockStackingContextType::PseudoStackingContext
} else {
BlockStackingContextType::NonstackingContext
}
}
pub fn has_scrolling_overflow(&self) -> bool {
@ -3037,3 +3041,12 @@ impl ISizeAndMarginsComputer for InlineBlockReplaced {
MaybeAuto::Specified(fragment.content_inline_size())
}
}
/// A stacking context, a pseudo-stacking context, or a non-stacking context.
#[derive(Copy, Clone, PartialEq)]
pub enum BlockStackingContextType {
NonstackingContext,
PseudoStackingContext,
StackingContext,
}