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fix(theme): use alternative contrast algorithm
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1 changed files with 6 additions and 3 deletions
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@ -220,8 +220,11 @@ function getContrastingColour(hex: string, fallback?: string): string {
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const colour = rgba(hex);
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if (!colour) return fallback ? getContrastingColour(fallback) : "black";
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// https://awik.io/determine-color-bright-dark-using-javascript/
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// http://alienryderflex.com/hsp.html
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const [r, g, b] = colour;
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return (r / 255) * 0.299 + (g / 255) * 0.587 + (b / 255) * 0.114 >= 0.186
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? "black"
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: "white";
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// const hsp = Math.sqrt(0.299 * r ** 2 + 0.587 * g ** 2 + 0.114 * b ** 2);
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// Using Skia numbers.
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const hsp = Math.sqrt(0.2126 * r ** 2 + 0.7152 * g ** 2 + 0.0722 * b ** 2);
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return hsp > 175 ? "black" : "white";
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}
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