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Reuse XYZ-D65's conversions for XYZ-D50 absolute conversions #170

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Reuse XYZ-D65's conversions for XYZ-D50 absolute conversions #170

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5 changes: 5 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -15,6 +15,10 @@ You can find its changes [documented below](#030-2025-04-30).

This release has an [MSRV][] of 1.82.

### Added

* Implement absolute color conversion methods for XYZ-D50 for faster conversion without chromatic adaptation to and from this color space. ([#170][] by [@tomcur][])

## [0.3.0][] (2025-04-30)

This release has an [MSRV][] of 1.82.
Expand Down Expand Up @@ -170,6 +174,7 @@ This is the initial release.
[#164]: https://github.com/linebender/color/pull/164
[#165]: https://github.com/linebender/color/pull/165
[#166]: https://github.com/linebender/color/pull/166
[#170]: https://github.com/linebender/color/pull/170

[Unreleased]: https://github.com/linebender/color/compare/v0.3.0...HEAD
[0.3.0]: https://github.com/linebender/color/releases/tag/v0.3.0
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13 changes: 13 additions & 0 deletions color/src/colorspace.rs
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Expand Up @@ -1061,6 +1061,19 @@ impl ColorSpace for XyzD50 {
matvecmul(&LINEAR_SRGB_TO_XYZ, src)
}

fn to_linear_srgb_absolute(src: [f32; 3]) -> [f32; 3] {
// Reuse XYZ-D65's conversions. This works because XYZ-D65 and sRGB both use the D65 white
// point, so the "relative" conversion specified in XYZ-D65 to/from linear sRGB is an
// absolute one. Plus, though XYZ-D50 is relative to D50, XYZ-D50 and XYZ-D65 are otherwise
// the same color space.
XyzD65::to_linear_srgb(src)
}

fn from_linear_srgb_absolute(src: [f32; 3]) -> [f32; 3] {
// See the note in the method above.
XyzD65::from_linear_srgb(src)
}

fn clip([x, y, z]: [f32; 3]) -> [f32; 3] {
[x, y, z]
}
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