Fix carry-forward of missing components for color mixing

Color::CarryForwardAnalogousMissingComponents() was operating on a copy of the Color, meaning that it was essentially a no-op. With that fixed it would however also clear any 'none' values that was introduced by the process of conversion. Split carry-forward handling to have a step before the conversion that determines which 'none' values to carry-forward and arrange them for the interpolation space, and one step after that simply applies the 'none' values determined by the pre-step. Fixed: 387132019 Change-Id: I4f678261082984a1002d6bf7db75cc4eeb17a026 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6258092 Auto-Submit: Fredrik Söderquist <fs@opera.com> Commit-Queue: Aaron Krajeski <aaronhk@chromium.org> Reviewed-by: Aaron Krajeski <aaronhk@chromium.org> Cr-Commit-Position: refs/heads/main@{#1421959}
web-platform-tests · Feb 19, 2025 · bbb5c43 · bbb5c43
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commit bbb5c43
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/css/css-color/color-mix-missing-components.html b/css/css-color/color-mix-missing-components.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>color-mix(): &lt;color>s with missing components</title>
+<link rel="help" href="https://drafts.csswg.org/css-color-5/#color-mix">
+<link rel="help" href="https://drafts.csswg.org/css-color-4/#interpolation-missing">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<script src="/css/support/color-testcommon.js"></script>
+<div id="target"></div>
+<script>
+  fuzzy_test_computed_color(`color-mix(in srgb, oklch(0 none none), white)`, `color(srgb 0.5 0.5 0.5)`);
+</script>