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Issue #2982 - Fix regression in previous commit by handling possible floating point issues

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Basilisk-Dev 2026-03-06 14:51:37 -05:00 • committed by EAZYBLACK
commit 2540231fbd
2 changed files with 22 additions and 3 deletions
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17
layout/style/nsCSSParser.cpp
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@ -186,6 +186,21 @@ OKLabToSRGBColor(float aL, float aA, float aB, float aAlpha)
{
// Per CSS Color, the lightness component for Oklab/Oklch is clamped.
float lightness = mozilla::clamped(aL, 0.0f, 1.0f);
uint8_t alpha =
nsStyleUtil::FloatToColorComponent(mozilla::clamped(aAlpha, 0.0f, 1.0f));
// Treat values extremely close to the endpoints as the endpoints to avoid
// tiny floating-point representation differences for percentage inputs.
static constexpr float kLightnessEndpointEpsilon = 0.000002f;
// If lightness is at either endpoint, the color is black/white regardless
// of chroma and hue (or a/b).
if (lightness <= kLightnessEndpointEpsilon) {
return NS_RGBA(0, 0, 0, alpha);
}
if (lightness >= 1.0f - kLightnessEndpointEpsilon) {
return NS_RGBA(255, 255, 255, alpha);
}
float lRoot = lightness + 0.3963377774f * aA + 0.2158037573f * aB;
float mRoot = lightness - 0.1055613458f * aA - 0.0638541728f * aB;
@ -207,7 +222,7 @@ OKLabToSRGBColor(float aL, float aA, float aB, float aAlpha)
NSToIntRound(r * 255.0f),
NSToIntRound(g * 255.0f),
NSToIntRound(b * 255.0f),
nsStyleUtil::FloatToColorComponent(mozilla::clamped(aAlpha, 0.0f, 1.0f)));
alpha);
}
static_assert(css::eAuthorSheetFeatures == 0 &&