RGBA color space (javascript)

argb.js

decode_argb = function(argb_val)
{
    /*
    - https://en.wikipedia.org/wiki/RGBA_color_space
    - ARGB (word-order)
    - https://developer.mozilla.org/en-US/docs/Web/CSS/color_value
    */

    return {
        a: (argb_val & 0xff000000) >>> 24,
        r: (argb_val & 0x00ff0000) >>> 16,
        g: (argb_val & 0x0000ff00) >>> 8,
        b: (argb_val & 0x000000ff)
    }
}

encode_argb = function(a, r, g, b)
{
    return (a << 24) + (r << 16) + (g << 8) + b;
}