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//! Linear encoding

use core::marker::PhantomData;

use crate::encoding::TransferFn;
use crate::float::Float;
use crate::luma::LumaStandard;
use crate::rgb::{RgbSpace, RgbStandard};
use crate::white_point::WhitePoint;

/// A generic standard with linear components.
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub struct Linear<S>(PhantomData<S>);

impl<S: RgbSpace> RgbStandard for Linear<S> {
    type Space = S;
    type TransferFn = LinearFn;
}

impl<Wp: WhitePoint> LumaStandard for Linear<Wp> {
    type WhitePoint = Wp;
    type TransferFn = LinearFn;
}

/// Linear color component encoding.
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub struct LinearFn;

impl TransferFn for LinearFn {
    #[inline(always)]
    fn into_linear<T: Float>(x: T) -> T {
        x
    }

    #[inline(always)]
    fn from_linear<T: Float>(x: T) -> T {
        x
    }
}