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layout: Don't built stacking contexts or display lists for empty blocks.

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This commit is contained in:
Josh Matthews 2020-06-02 16:50:40 -04:00
parent 4094d16323
commit 08427ccee5
6 changed files with 50 additions and 1 deletions
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10
components/layout/display_list/builder.rs
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@ -1571,6 +1571,11 @@ impl Fragment {
return;
}
// If this fragment takes up no space, we don't need to build any display items for it.
if self.has_non_invertible_transform() {
return;
}
debug!(
"Fragment::build_display_list at rel={:?}, abs={:?}: {:?}",
self.border_box, stacking_relative_border_box, self
@ -2376,6 +2381,11 @@ impl BlockFlow {
state: &mut StackingContextCollectionState,
flags: StackingContextCollectionFlags,
) {
// This block flow produces no stacking contexts if it takes up no space.
if self.has_non_invertible_transform() {
return;
}
let mut preserved_state = SavedStackingContextCollectionState::new(state);
let stacking_context_type = self.stacking_context_type(flags);