color.ts

export function shadeBlendConvert(p, from, to) {
    if (typeof (p) != "number" || p < -1 || p > 1 || typeof (from) != "string" || (from[0] != 'r' && from[0] != '#') || (to && typeof (to) != "string")) return null; //ErrorCheck
    if (!this.sbcRip) this.sbcRip = (d) => {
        let l = d.length, RGB = {};
        if (l > 9) {
            d = d.split(",");
            if (d.length < 3 || d.length > 4) return null;//ErrorCheck
            RGB[0] = i(d[0].split("(")[1]), RGB[1] = i(d[1]), RGB[2] = i(d[2]), RGB[3] = d[3] ? parseFloat(d[3]) : -1;
        } else {
            if (l == 8 || l == 6 || l < 4) return null; //ErrorCheck
            if (l < 6) d = "#" + d[1] + d[1] + d[2] + d[2] + d[3] + d[3] + (l > 4 ? d[4] + "" + d[4] : ""); //3 or 4 digit
            d = i(d.slice(1), 16), RGB[0] = d >> 16 & 255, RGB[1] = d >> 8 & 255, RGB[2] = d & 255, RGB[3] = -1;
            if (l == 9 || l == 5) RGB[3] = r((RGB[2] / 255) * 10000) / 10000, RGB[2] = RGB[1], RGB[1] = RGB[0], RGB[0] = d >> 24 & 255;
        }
        return RGB;
    }
    var i = parseInt,
        r = Math.round,
        h = from.length > 9,
        h = typeof (to) == "string" ? to.length > 9 ? true : to == "c" ? !h : false : h,
        b = p < 0,
        p = <any>(b ? p * -1 : p),
        to = to && to != "c" ? to : b ? "#000000" : "#FFFFFF",
        f = this.sbcRip(from),
        t = this.sbcRip(to);
    if (!f || !t) return null; //ErrorCheck
    if (h) return "rgb" + (f[3] > -1 || t[3] > -1 ? "a(" : "(") + r((t[0] - f[0]) * p + f[0]) + "," + r((t[1] - f[1]) * p + f[1]) + "," + r((t[2] - f[2]) * p + f[2]) + (f[3] < 0 && t[3] < 0 ? ")" : "," + (f[3] > -1 && t[3] > -1 ? r(((t[3] - f[3]) * p + f[3]) * 10000) / 10000 : t[3] < 0 ? f[3] : t[3]) + ")");
    else return "#" + (0x100000000 + r((t[0] - f[0]) * p + f[0]) * 0x1000000 + r((t[1] - f[1]) * p + f[1]) * 0x10000 + r((t[2] - f[2]) * p + f[2]) * 0x100 + (f[3] > -1 && t[3] > -1 ? r(((t[3] - f[3]) * p + f[3]) * 255) : t[3] > -1 ? r(t[3] * 255) : f[3] > -1 ? r(f[3] * 255) : 255)).toString(16).slice(1, f[3] > -1 || t[3] > -1 ? undefined : -2);
}