Add Compose::PlusDarker

Signed-off-by: sagudev <[email protected]>

Author: sagudev

CHANGELOG.md

@@ -15,6 +15,10 @@ You can find its changes [documented below](#040-2025-04-30).
 
 This release has an [MSRV] of 1.82.
 
+### Added
+
+- `PlusDarker` variant to `Compose`
+
 ## [0.4.0][] (2025-04-30)
 
 This release has an [MSRV] of 1.82.

src/blend.rs

@@ -91,6 +91,9 @@ pub enum Compose {
     /// Allows two elements to cross fade by changing their opacities from 0 to 1 on one
     /// element and 1 to 0 on the other element.
     PlusLighter = 13,
+    /// Allows two elements to cross fade by changing their opacities from 1 to 0 on one
+    /// element and 0 to 1 on the other element.
+    PlusDarker = 14,
     // NOTICE: If a new value is added, be sure to modify `MAX_VALUE` in the bytemuck impl.
 }
 

src/impl_bytemuck.rs

@@ -27,7 +27,7 @@ unsafe impl bytemuck::checked::CheckedBitPattern for Compose {
 unsafe impl bytemuck::Contiguous for Compose {
     type Int = u8;
     const MIN_VALUE: u8 = Self::Clear as u8;
-    const MAX_VALUE: u8 = Self::PlusLighter as u8;
+    const MAX_VALUE: u8 = Self::PlusDarker as u8;
 }
 
 // Safety: The enum is `repr(u8)` and has only fieldless variants.
@@ -188,7 +188,7 @@ mod tests {
 
     #[test]
     fn contiguous() {
-        let compose1 = Compose::PlusLighter;
+        let compose1 = Compose::PlusDarker;
         let compose2 = Compose::from_integer(compose1.into_integer());
         assert_eq!(Some(compose1), compose2);