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peniko: add BlendMode::is_destructive #166

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Merged
waywardmonkeys merged 1 commit into from
Apr 16, 2026
Merged

peniko: add BlendMode::is_destructive #166

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17 changes: 17 additions & 0 deletions peniko/src/blend.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -170,6 +170,23 @@ impl BlendMode {
pub const fn new(mix: Mix, compose: Compose) -> Self {
Self { mix, compose }
}

/// Returns whether this blend mode might cause destructive changes in the backdrop.
///
/// Destructive blend modes disallow certain optimizations, such as skipping
/// transparent paints.
#[must_use]
pub const fn is_destructive(&self) -> bool {
matches!(
self.compose,
Compose::Clear
| Compose::Copy
| Compose::SrcIn
| Compose::DestIn
| Compose::SrcOut
| Compose::DestAtop
)
}
}

impl Default for BlendMode {
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