From d72f0961867826c6bf9983b40734ada6e1dab70e Mon Sep 17 00:00:00 2001 From: Trevor Brown Date: Sun, 1 Nov 2026 11:54:35 -0500 Subject: [PATCH] M8: color-mix(): a none in color() is a missing component too Co-Authored-By: Claude Fable 5.1 --- crates/svg/src/import/css_color.rs | 5 ++++- crates/svg/src/import/css_color_tests.rs | 9 +++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/crates/svg/src/import/css_color.rs b/crates/svg/src/import/css_color.rs index 9301275ed..715883de8 100644 --- a/crates/svg/src/import/css_color.rs +++ b/crates/svg/src/import/css_color.rs @@ -218,12 +218,15 @@ fn color_fn(args: &str, profile: ColorProfile) -> Eval { None => 1.0, }; let c = Color::new(value(r)?, value(g)?, value(b)?, a); + // A `none` is 0 here and missing in a mix: reds, greens and blues are analogous across the RGB + // spaces (CSS Color 4 section 12.2), so a missing channel stays missing through the conversion. + let missing = Missing { r: *r == "none", g: *g == "none", b: *b == "none", a: alpha == Some("none") }; let (from, why) = match *space { "srgb" => (ColorProfile::Srgb, None), "display-p3" => (ColorProfile::DisplayP3, None), _ => (ColorProfile::Srgb, Some("only the srgb and display-p3 spaces are read: its values were taken as sRGB")), }; - Ok((from.conversion_to(profile).apply(c), why, Missing::NONE)) + Ok((from.conversion_to(profile).apply(c), why, missing)) } /// A CSS number, a percentage (100% is 1) or `none` (0); finite only. diff --git a/crates/svg/src/import/css_color_tests.rs b/crates/svg/src/import/css_color_tests.rs index ee66b42da..c327fee01 100644 --- a/crates/svg/src/import/css_color_tests.rs +++ b/crates/svg/src/import/css_color_tests.rs @@ -86,6 +86,15 @@ fn color_mix_in_srgb_oklab_and_oklch() { assert_eq!(rgba8(fill("color-mix(in oklab, rgb(none 0 0), red)").0), rgba8(fill("color-mix(in oklab, black, red)").0)); // Missing in both stays missing through a nested mix and is carried in the outer one. assert_eq!(rgba8(fill("color-mix(in srgb, color-mix(in srgb, rgb(0 255 0 / none), rgb(0 255 0 / none)), red)").0), Some([128, 128, 0, 255])); + // `color()` gives its `none` values the same way, in either of its spaces (reds, greens and + // blues are analogous across RGB spaces, CSS Color 4 section 12.2). + assert_eq!(rgba8(fill("color-mix(in srgb, color(srgb 1 0 0 / none), blue)").0), Some([128, 0, 128, 255])); + assert_eq!(rgba8(fill("color-mix(in srgb, color(srgb none 0 0), red)").0), Some([255, 0, 0, 255])); + assert_eq!(rgba8(fill("color-mix(in srgb, color(display-p3 none 0 0), red)").0), Some([255, 0, 0, 255])); + assert_eq!( + rgba8(fill("color-mix(in srgb, color-mix(in srgb, color(srgb 0 1 0 / none), color(srgb 0 1 0 / none)), red)").0), + Some([128, 128, 0, 255]) + ); // Nested, with color() inside. assert_eq!(rgba8(fill("color-mix(in srgb, color-mix(in srgb, red, blue), color(srgb 0 1 0) 0%)").0), Some([128, 0, 128, 255])); }