Derive PartialEq for AlphaColor, OpaqueColor, PremulColor (#76)

CHANGELOG.md

@@ -25,6 +25,7 @@ This release has an [MSRV][] of 1.82.
 * Support for the `ACEScg` colorspace. ([#54][] by [@MightyBurger][])
 * `DynamicColor` gets `with_alpha` and `multiply_alpha`. ([#71][] by [@waywardmonkeys][])
 * `DynamicColor` now impls `Hash` and `PartialEq`. ([#75][] by [@waywardmonkeys][])
+* `AlphaColor`, `OpaqueColor`, and `PremulColor` now impl `PartialEq`. ([#76][] by [@waywardmonkeys][])
 * `HueDirection` now impls `PartialEq`. ([#79][] by [@waywardmonkeys][])
 * `ColorSpaceTag` and `HueDirection` now have bytemuck support. ([#81][] by [@waywardmonkeys][])
 
@@ -55,6 +56,7 @@ This is the initial release.
 [#70]: https://github.com/linebender/color/pull/70
 [#71]: https://github.com/linebender/color/pull/71
 [#75]: https://github.com/linebender/color/pull/75
+[#76]: https://github.com/linebender/color/pull/76
 [#77]: https://github.com/linebender/color/pull/77
 [#78]: https://github.com/linebender/color/pull/78
 [#79]: https://github.com/linebender/color/pull/79

color/src/color.rs

@@ -21,7 +21,7 @@ use crate::floatfuncs::FloatFuncs;
 /// major motivation for including these is to enable weighted sums, including
 /// for spline interpolation. For cylindrical color spaces, hue fixup should
 /// be applied before interpolation.
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, PartialEq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[repr(transparent)]
 pub struct OpaqueColor<CS> {
@@ -38,7 +38,7 @@ pub struct OpaqueColor<CS> {
 /// A color in a color space known at compile time, with an alpha channel.
 ///
 /// See [`OpaqueColor`] for a discussion of arithmetic traits and interpolation.
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, PartialEq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[repr(transparent)]
 pub struct AlphaColor<CS> {
@@ -61,7 +61,7 @@ pub struct AlphaColor<CS> {
 /// give undesirable results.
 ///
 /// See [`OpaqueColor`] for a discussion of arithmetic traits and interpolation.
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, PartialEq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[repr(transparent)]
 pub struct PremulColor<CS> {