@mapcss/preset-svg/esm/core/utils/parse.js

SVG as CSS for MapCSS

export function hex2RGBA(str) {
    const [, body] = str.match(/^#?([\da-f]+)$/i) || [];
    if (!body) {
        return;
    }
    switch (body.length) {
        case 3:
        case 4: {
            const digits = Array.from(body, (s) => Number.parseInt(s, 16)).map((n) => (n << 4) | n);
            const [r, g, b] = digits;
            return {
                r,
                g,
                b,
                a: body.length === 3
                    ? undefined
                    : Math.round(digits[3] / 255 * 100) / 100,
            };
        }
        case 6:
        case 8: {
            const value = Number.parseInt(body, 16);
            const [r, g, b] = body.length === 6
                ? [(value >> 16) & 0xFF, (value >> 8) & 0xFF, value & 0xFF]
                : [(value >> 24) & 0xFF, (value >> 16) & 0xFF, (value >> 8) & 0xFF];
            return {
                r,
                g,
                b,
                a: body.length === 6
                    ? undefined
                    : Math.round((value & 0xFF) / 255 * 100) / 100,
            };
        }
    }
}