UI agnostic color management for Swift

Summary of the key points in this color management system design:

ColorSpace: Base protocol for all color spaces LinearColorSpace: Protocol for linear color spaces AbsoluteColorSpace: Protocol for absolute color spaces (e.g., XYZ, Lab) RelativeColorSpace: Protocol for relative color spaces (e.g., sRGB, Adobe RGB)

ColorUnit: Typealias for Double, used for color component values CIExyY: Structure for representing chromaticity coordinates and luminance Matrix3x3: Utility structure for 3x3 matrix operations

Each color space (e.g., XYZ, sRGB, AdobeRGB, HSL, HSLuv) is implemented as a struct conforming to the appropriate protocol(s) Linear and non-linear versions of RGB color spaces are separate structs Each color space includes methods for conversion to/from XYZ

Generic struct that encapsulates a color space, white point, and illuminant Provides a convert method for transforming between color spaces

Protocols defined for chromatic adaptation and color appearance models Default implementations provided (e.g., Bradford adaptation, simple CAM)

Clear separation between linear and non-linear color spaces Distinction between absolute and relative color spaces Fully spelled-out color component names (e.g., red, green, blue instead of r, g, b) Support for different white points and illuminants Accurate implementations of complex color spaces (e.g., HSLuv)

Conversion between 8-bit integer and floating-point representations Clamping methods to ensure color values are within valid ranges Direct conversions between common color spaces (e.g., sRGB to Adobe RGB)

Easy to add new color spaces by conforming to existing protocols Chromatic adaptation and color appearance models can be easily swapped or extended

This design provides a robust, flexible, and accurate foundation for color management, allowing for precise color space conversions and manipulations while maintaining type safety and clarity in the codebase.