sharp-chat/SharpChatCommon/Colour.cs

namespace SharpChat {
    public readonly struct Colour {
        public readonly byte Red;
        public readonly byte Green;
        public readonly byte Blue;
        public readonly bool Inherits;

        public static Colour None { get; } = new();

        public Colour() {
            Red = 0;
            Green = 0;
            Blue = 0;
            Inherits = true;
        }

        public Colour(byte red, byte green, byte blue) {
            Red = red;
            Green = green;
            Blue = blue;
            Inherits = false;
        }

        public bool Equals(Colour other) {
            return Inherits == other.Inherits
                && Red == other.Red
                && Green == other.Green
                && Blue == other.Blue;
        }

        public override string ToString() {
            return Inherits
                ? "inherit"
                : string.Format("#{0:x2}{1:x2}{2:x2}", Red, Green, Blue);
        }

        public int ToRawRGB() {
            return (Red << 16) | (Green << 8) | Blue;
        }

        public static Colour FromRawRGB(int rgb) {
            return new(
                (byte)((rgb >> 16) & 0xFF),
                (byte)((rgb >> 8) & 0xFF),
                (byte)(rgb & 0xFF)
            );
        }

        private const int MSZ_INHERIT = 0x40000000;

        public int ToMisuzu() {
            return Inherits ? MSZ_INHERIT : ToRawRGB();
        }

        public static Colour FromMisuzu(int raw) {
            return (raw & MSZ_INHERIT) > 0
                ? None
                : FromRawRGB(raw);
        }
    }
}