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layout: Implement opacity per CSS-COLOR § 3.2.

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This adds the infrastructure necessary to support stacking contexts that
are not containing blocks for absolutely-positioned elements. Our
infrastructure did not support that before. This minor revamp actually
ended up simplifying the logic around display list building and
stacking-relative position computation for absolutely-positioned flows,
which was nice.
This commit is contained in:
Patrick Walton 2014-11-18 15:37:53 -08:00
parent 873ca6cadd
commit 1c1c507c03
17 changed files with 421 additions and 146 deletions
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3
components/layout/fragment.rs
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@ -1494,6 +1494,9 @@ impl Fragment {
/// Returns true if this fragment establishes a new stacking context and false otherwise.
pub fn establishes_stacking_context(&self) -> bool {
if self.style().get_effects().opacity != 1.0 {
return true
}
match self.style().get_box().position {
position::absolute | position::fixed => {
// FIXME(pcwalton): This should only establish a new stacking context when