/**
 * Converts a hex color number to an [R, G, B] array
 *
 * @memberof PIXI.utils
 * @function hex2rgb
 * @param {number} hex - The number to convert
 * @param  {number[]} [out=[]] If supplied, this array will be used rather than returning a new one
 * @return {number[]} An array representing the [R, G, B] of the color.
 */
export function hex2rgb(hex, out)
{
    out = out || [];

    out[0] = ((hex >> 16) & 0xFF) / 255;
    out[1] = ((hex >> 8) & 0xFF) / 255;
    out[2] = (hex & 0xFF) / 255;

    return out;
}

/**
 * Converts a hex color number to a string.
 *
 * @memberof PIXI.utils
 * @function hex2string
 * @param {number} hex - Number in hex
 * @return {string} The string color.
 */
export function hex2string(hex)
{
    hex = hex.toString(16);
    hex = '000000'.substr(0, 6 - hex.length) + hex;

    return `#${hex}`;
}

/**
 * Converts a hex string to a hex color number.
 *
 * @memberof PIXI.utils
 * @function string2hex
 * @param {string} The string color that starts with #
 * @return {number} hex - Number in hex
 */
export function string2hex(string)
{
    if (typeof string === 'string' && string[0] === '#')
    {
        string = string.substr(1);
    }

    return parseInt(string, 16);
}

/**
 * Converts a color as an [R, G, B] array to a hex number
 *
 * @memberof PIXI.utils
 * @function rgb2hex
 * @param {number[]} rgb - rgb array
 * @return {number} The color number
 */
export function rgb2hex(rgb)
{
    return (((rgb[0] * 255) << 16) + ((rgb[1] * 255) << 8) + (rgb[2] * 255 | 0));
}