问在javascript中将3D LUTs相互结合

EN

function mapColorsFast(out, image, clut, clutMix){
    let od = out.data,
        id = image.data,
        w = out.width,
        h = out.height,
        cd = clut.data,
        cl = Math.floor(Math.pow(clut.width, 1/3)+0.001),
        cs = cl*cl,
        cs1 = cs-1;

    var x0 = 1 - clutMix, x1 = clutMix;
    for(var y = 0; y < h; y++) {
        for(var x = 0; x < w; x++) {
            let i = (y*w+x)*4,
                r = id[i]/255*cs1,
                g = id[i+1]/255*cs1,
                b = id[i+2]/255*cs1,
                a = id[i+3]/255,
                ci = (dither(b)*cs*cs+dither(g)*cs+dither(r))*4;

            od[i] = id[i]*x0 + x1*cd[ci];
            od[i+1] = id[i+1]*x0 + x1*cd[ci+1];
            od[i+2] = id[i+2]*x0 + x1*cd[ci+2];
            od[i+3] = a*255;
        }
    }
}