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Fix transform assertion failures in Layout 2013 and Layout 2020 (#30713)

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Layout asserts that it never creates stacking contexts that have a zero
scale, yet it doesn't prevent the creation of those stacking contexts.
This change stops their creation at an earlier stage.

Fixes #30118.
This commit is contained in:
Martin Robinson 2023-11-13 10:09:25 +01:00 • committed by GitHub
parent 1915032f66
commit 72cb34dc3d
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8 changed files with 19 additions and 17 deletions
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6
components/layout/fragment.rs
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@ -2760,9 +2760,11 @@ impl Fragment {
}
/// 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 {
pub fn has_non_invertible_transform_or_zero_scale(&self) -> bool {
self.transform_matrix(&Rect::default())
.map_or(false, |matrix| !matrix.is_invertible())
.map_or(false, |matrix| {
!matrix.is_invertible() || matrix.m11 == 0. || matrix.m22 == 0.
})
}
/// Returns true if this fragment establishes a new stacking context and false otherwise.