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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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6
components/layout/fragment.rs
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@ -2730,6 +2730,12 @@ impl Fragment {
self.style().get_box().perspective != Perspective::None
}
/// Returns true if this fragment has a transform applied that causes it to take up no space.
pub fn has_non_invertible_transform(&self) -> bool {
self.transform_matrix(&Rect::default())
.map_or(false, |matrix| !matrix.is_invertible())
}
/// Returns true if this fragment establishes a new stacking context and false otherwise.
pub fn establishes_stacking_context(&self) -> bool {
// Text fragments shouldn't create stacking contexts.