Struct palette::Xyz

#[repr(C)]
pub struct Xyz<Wp = D65, T = f32> where
    T: FloatComponent,
    Wp: WhitePoint,  {
    pub x: T,
    pub y: T,
    pub z: T,
    pub white_point: PhantomData<Wp>,
}

The CIE 1931 XYZ color space.

XYZ links the perceived colors to their wavelengths and simply makes it possible to describe the way we see colors as numbers. It’s often used when converting from one color space to an other, and requires a standard illuminant and a standard observer to be defined.

Conversions and operations on this color space depend on the defined white point

Fields

x: T

X is the scale of what can be seen as a response curve for the cone cells in the human eye. Its range depends on the white point and goes from 0.0 to 0.95047 for the default D65.

y: T

Y is the luminance of the color, where 0.0 is black and 1.0 is white.

z: T

Z is the scale of what can be seen as the blue stimulation. Its range depends on the white point and goes from 0.0 to 1.08883 for the default D65.

white_point: PhantomData<Wp>

The white point associated with the color’s illuminant and observer. D65 for 2 degree observer is used by default.

Implementations

impl<T> Xyz<D65, T> where
    T: FloatComponent, 

pub fn new(x: T, y: T, z: T) -> Xyz<D65, T>

CIE XYZ with white point D65.

impl<Wp, T> Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

pub fn with_wp(x: T, y: T, z: T) -> Xyz<Wp, T>

CIE XYZ.

pub fn into_components(self) -> (T, T, T)

Convert to a (X, Y, Z) tuple.

pub fn from_components((x, y, z): (T, T, T)) -> Self

Convert from a (X, Y, Z) tuple.

pub fn min_x() -> T

Return the x value minimum.

pub fn max_x() -> T

Return the x value maximum.

pub fn min_y() -> T

Return the y value minimum.

pub fn max_y() -> T

Return the y value maximum.

pub fn min_z() -> T

Return the z value minimum.

pub fn max_z() -> T

Return the z value maximum.

Trait Implementations

impl<Wp, T> AbsDiffEq<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent + AbsDiffEq,
    T::Epsilon: Copy + FloatComponent,
    Wp: WhitePoint + PartialEq, 

type Epsilon = T::Epsilon

Used for specifying relative comparisons.

fn default_epsilon() -> Self::Epsilon

The default tolerance to use when testing values that are close together.

fn abs_diff_eq(&self, other: &Self, epsilon: T::Epsilon) -> bool

A test for equality that uses the absolute difference to compute the approximate equality of two numbers.

fn abs_diff_ne(&self, other: &Self, epsilon: T::Epsilon) -> bool

The inverse of AbsDiffEq::abs_diff_eq.

impl<Wp, T> Add<T> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Output = Xyz<Wp, T>

The resulting type after applying the + operator.

fn add(self, c: T) -> Self::Output

Performs the + operation.

impl<Wp, T> Add<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Output = Xyz<Wp, T>

The resulting type after applying the + operator.

fn add(self, other: Xyz<Wp, T>) -> Self::Output

Performs the + operation.

impl<Wp, T> AddAssign<T> for Xyz<Wp, T> where
    T: FloatComponent + AddAssign,
    Wp: WhitePoint, 

fn add_assign(&mut self, c: T)

Performs the += operation.

impl<Wp, T> AddAssign<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent + AddAssign,
    Wp: WhitePoint, 

fn add_assign(&mut self, other: Xyz<Wp, T>)

Performs the += operation.

impl<Wp, T, P: ?Sized> AsMut<P> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    P: RawPixel<T>, 

fn as_mut(&mut self) -> &mut P

Performs the conversion.

impl<Wp, T, P: ?Sized> AsRef<P> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    P: RawPixel<T>, 

fn as_ref(&self) -> &P

Performs the conversion.

impl<Wp, T> Clamp for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

fn is_within_bounds(&self) -> bool

Check if the color’s components are within the expected clamped range bounds.

fn clamp(&self) -> Xyz<Wp, T>

Return a new color where the components have been clamped to the nearest valid values.

fn clamp_self(&mut self)

Clamp the color’s components to the nearest valid values.

impl<Wp, T> Clone for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

fn clone(&self) -> Xyz<Wp, T>

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<Wp, T> ComponentWise for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Scalar = T

The scalar type for color components.

fn component_wise<F: FnMut(T, T) -> T>(
    &self,
    other: &Xyz<Wp, T>,
    f: F
) -> Xyz<Wp, T>

Perform a binary operation on this and an other color.

fn component_wise_self<F: FnMut(T) -> T>(&self, f: F) -> Xyz<Wp, T>

Perform a unary operation on this color.

impl<Wp: Debug, T: Debug> Debug for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<Wp, T> Default for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

fn default() -> Xyz<Wp, T>

Returns the “default value” for a type.

impl<Wp, T> Div<T> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Output = Xyz<Wp, T>

The resulting type after applying the / operator.

fn div(self, c: T) -> Self::Output

Performs the / operation.

impl<Wp, T> Div<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Output = Xyz<Wp, T>

The resulting type after applying the / operator.

fn div(self, other: Xyz<Wp, T>) -> Self::Output

Performs the / operation.

impl<Wp, T> DivAssign<T> for Xyz<Wp, T> where
    T: FloatComponent + DivAssign,
    Wp: WhitePoint, 

fn div_assign(&mut self, c: T)

Performs the /= operation.

impl<Wp, T> DivAssign<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent + DivAssign,
    Wp: WhitePoint, 

fn div_assign(&mut self, other: Xyz<Wp, T>)

Performs the /= operation.

impl<Wp: WhitePoint, T: FloatComponent> From<(T, T, T)> for Xyz<Wp, T>

fn from(components: (T, T, T)) -> Self

Performs the conversion.

impl<Wp, T, _C, _A> FromColorUnclamped<Alpha<_C, _A>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    Wp: WhitePoint,
    _C: IntoColorUnclamped<Self>,
    _A: Component, 

fn from_color_unclamped(color: Alpha<_C, _A>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T, _S> FromColorUnclamped<Hsl<_S, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    _S: RgbStandard,
    _S::Space: RgbSpace<WhitePoint = Wp>, 

fn from_color_unclamped(color: Hsl<_S, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Hsluv<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent, 

fn from_color_unclamped(color: Hsluv<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T, _S> FromColorUnclamped<Hsv<_S, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    _S: RgbStandard,
    _S::Space: RgbSpace<WhitePoint = Wp>, 

fn from_color_unclamped(color: Hsv<_S, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T, _S> FromColorUnclamped<Hwb<_S, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    _S: RgbStandard,
    _S::Space: RgbSpace<WhitePoint = Wp>, 

fn from_color_unclamped(color: Hwb<_S, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Lab<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

fn from_color_unclamped(color: Lab<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Lch<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent, 

fn from_color_unclamped(color: Lch<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Lchuv<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent, 

fn from_color_unclamped(color: Lchuv<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T, S> FromColorUnclamped<Luma<S, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    S: LumaStandard<WhitePoint = Wp>, 

fn from_color_unclamped(color: Luma<S, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Luv<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

fn from_color_unclamped(color: Luv<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T, S> FromColorUnclamped<Rgb<S, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    S: RgbStandard,
    S::Space: RgbSpace<WhitePoint = Wp>, 

fn from_color_unclamped(color: Rgb<S, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<S, T> FromColorUnclamped<Xyz<<<S as RgbStandard>::Space as RgbSpace>::WhitePoint, T>> for Hsl<S, T> where
    T: FloatComponent,
    S: RgbStandard,
    T: FloatComponent,
    T: FloatComponent, 

fn from_color_unclamped(
    color: Xyz<<S::Space as RgbSpace>::WhitePoint, T>
) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<S, T> FromColorUnclamped<Xyz<<<S as RgbStandard>::Space as RgbSpace>::WhitePoint, T>> for Hsv<S, T> where
    T: FloatComponent,
    S: RgbStandard,
    T: FloatComponent,
    T: FloatComponent, 

fn from_color_unclamped(
    color: Xyz<<S::Space as RgbSpace>::WhitePoint, T>
) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<S, T> FromColorUnclamped<Xyz<<<S as RgbStandard>::Space as RgbSpace>::WhitePoint, T>> for Hwb<S, T> where
    T: FloatComponent,
    S: RgbStandard,
    T: FloatComponent,
    T: FloatComponent, 

fn from_color_unclamped(
    color: Xyz<<S::Space as RgbSpace>::WhitePoint, T>
) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<S, T> FromColorUnclamped<Xyz<<<S as RgbStandard>::Space as RgbSpace>::WhitePoint, T>> for Rgb<S, T> where
    S: RgbStandard,
    T: FloatComponent, 

fn from_color_unclamped(
    color: Xyz<<S::Space as RgbSpace>::WhitePoint, T>
) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<S, T> FromColorUnclamped<Xyz<<S as LumaStandard>::WhitePoint, T>> for Luma<S, T> where
    S: LumaStandard,
    T: FloatComponent, 

fn from_color_unclamped(color: Xyz<S::WhitePoint, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Xyz<Wp, T>> for Hsluv<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent, 

fn from_color_unclamped(color: Xyz<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Xyz<Wp, T>> for Lab<Wp, T> where
    Wp: WhitePoint,
    T: FloatComponent, 

fn from_color_unclamped(color: Xyz<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Xyz<Wp, T>> for Lch<Wp, T> where
    Wp: WhitePoint,
    T: FloatComponent, 

fn from_color_unclamped(color: Xyz<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Xyz<Wp, T>> for Lchuv<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent,
    Wp: WhitePoint,
    T: FloatComponent, 

fn from_color_unclamped(color: Xyz<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Xyz<Wp, T>> for Luv<Wp, T> where
    Wp: WhitePoint,
    T: FloatComponent, 

fn from_color_unclamped(color: Xyz<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Xyz<Wp, T>> for Xyz<Wp, T> where
    Wp: WhitePoint,
    T: FloatComponent, 

fn from_color_unclamped(color: Xyz<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Xyz<Wp, T>> for Yxy<Wp, T> where
    Wp: WhitePoint,
    T: FloatComponent, 

fn from_color_unclamped(xyz: Xyz<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp, T> FromColorUnclamped<Yxy<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

fn from_color_unclamped(color: Yxy<Wp, T>) -> Self

Convert from T. The resulting color might be invalid in its color space.

impl<Wp: WhitePoint, T: FloatComponent> Into<(T, T, T)> for Xyz<Wp, T>

fn into(self) -> (T, T, T)

Performs the conversion.

impl<Wp, T> Mix for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Scalar = T

The type of the mixing factor.

fn mix(&self, other: &Xyz<Wp, T>, factor: T) -> Xyz<Wp, T>

Mix the color with an other color, by factor.

impl<Wp, T> Mul<T> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Output = Xyz<Wp, T>

The resulting type after applying the * operator.

fn mul(self, c: T) -> Self::Output

Performs the * operation.

impl<Wp, T> Mul<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Output = Xyz<Wp, T>

The resulting type after applying the * operator.

fn mul(self, other: Xyz<Wp, T>) -> Self::Output

Performs the * operation.

impl<Wp, T> MulAssign<T> for Xyz<Wp, T> where
    T: FloatComponent + MulAssign,
    Wp: WhitePoint, 

fn mul_assign(&mut self, c: T)

Performs the *= operation.

impl<Wp, T> MulAssign<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent + MulAssign,
    Wp: WhitePoint, 

fn mul_assign(&mut self, other: Xyz<Wp, T>)

Performs the *= operation.

impl<Wp, T> PartialEq<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent + PartialEq,
    Wp: WhitePoint, 

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use]

pub fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<Wp, T> Pixel<T> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

const CHANNELS: usize

The number of color channels.

fn as_raw<P: RawPixel<T> + ?Sized>(&self) -> &P

Cast as a reference to raw color components.

fn as_raw_mut<P: RawPixel<T> + ?Sized>(&mut self) -> &mut P

Cast as a mutable reference to raw color components.

fn into_raw<P: RawPixelSized<T>>(self) -> P

Convert into raw color components.

fn from_raw<P: RawPixel<T> + ?Sized>(pixel: &P) -> &Self

Cast from a reference to raw color components.

fn from_raw_mut<P: RawPixel<T> + ?Sized>(pixel: &mut P) -> &mut Self

Cast from a mutable reference to raw color components.

fn from_raw_slice(slice: &[T]) -> &[Self]

Cast a slice of raw color components to a slice of colors.

fn from_raw_slice_mut(slice: &mut [T]) -> &mut [Self]

Cast a mutable slice of raw color components to a mutable slice of colors.

fn into_raw_slice(slice: &[Self]) -> &[T]

Cast a slice of colors to a slice of raw color components.

fn into_raw_slice_mut(slice: &mut [Self]) -> &mut [T]

Cast a mutable slice of colors to a mutable slice of raw color components.

impl<Wp, T> RelativeContrast for Xyz<Wp, T> where
    Wp: WhitePoint,
    T: FloatComponent, 

type Scalar = T

The type of the contrast ratio.

fn get_contrast_ratio(&self, other: &Self) -> T

Calculate the contrast ratio between two colors.

fn has_min_contrast_text(&self, other: &Self) -> bool

Verify the contrast between two colors satisfies SC 1.4.3. Contrast is at least 4.5:1 (Level AA).

fn has_min_contrast_large_text(&self, other: &Self) -> bool

Verify the contrast between two colors satisfies SC 1.4.3 for large text. Contrast is at least 3:1 (Level AA).

fn has_enhanced_contrast_text(&self, other: &Self) -> bool

Verify the contrast between two colors satisfies SC 1.4.6. Contrast is at least 7:1 (Level AAA).

fn has_enhanced_contrast_large_text(&self, other: &Self) -> bool

Verify the contrast between two colors satisfies SC 1.4.6 for large text. Contrast is at least 4.5:1 (Level AAA).

fn has_min_contrast_graphics(&self, other: &Self) -> bool

Verify the contrast between two colors satisfies SC 1.4.11 for graphical objects. Contrast is at least 3:1 (Level AA).

impl<Wp, T> RelativeEq<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent + RelativeEq,
    T::Epsilon: Copy + FloatComponent,
    Wp: WhitePoint + PartialEq, 

fn default_max_relative() -> T::Epsilon

The default relative tolerance for testing values that are far-apart.

fn relative_eq(
    &self,
    other: &Self,
    epsilon: T::Epsilon,
    max_relative: T::Epsilon
) -> bool

A test for equality that uses a relative comparison if the values are far apart.

fn relative_ne(
    &self,
    other: &Self,
    epsilon: T::Epsilon,
    max_relative: T::Epsilon
) -> bool

The inverse of RelativeEq::relative_eq.

impl<Wp, T> Shade for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Scalar = T

The type of the lighten/darken modifier.

fn lighten(&self, factor: T) -> Xyz<Wp, T>

Scale the color towards the maximum lightness by factor, a value ranging from 0.0 to 1.0.

fn lighten_fixed(&self, amount: T) -> Xyz<Wp, T>

Lighten the color by amount, a value ranging from 0.0 to 1.0.

fn darken(&self, factor: Self::Scalar) -> Self

Scale the color towards the minimum lightness by factor, a value ranging from 0.0 to 1.0.

fn darken_fixed(&self, amount: Self::Scalar) -> Self

Darken the color by amount, a value ranging from 0.0 to 1.0.

impl<Wp, T> Sub<T> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Output = Xyz<Wp, T>

The resulting type after applying the - operator.

fn sub(self, c: T) -> Self::Output

Performs the - operation.

impl<Wp, T> Sub<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

type Output = Xyz<Wp, T>

The resulting type after applying the - operator.

fn sub(self, other: Xyz<Wp, T>) -> Self::Output

Performs the - operation.

impl<Wp, T> SubAssign<T> for Xyz<Wp, T> where
    T: FloatComponent + SubAssign,
    Wp: WhitePoint, 

fn sub_assign(&mut self, c: T)

Performs the -= operation.

impl<Wp, T> SubAssign<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent + SubAssign,
    Wp: WhitePoint, 

fn sub_assign(&mut self, other: Xyz<Wp, T>)

Performs the -= operation.

impl<Wp, T> UlpsEq<Xyz<Wp, T>> for Xyz<Wp, T> where
    T: FloatComponent + UlpsEq,
    T::Epsilon: Copy + FloatComponent,
    Wp: WhitePoint + PartialEq, 

fn default_max_ulps() -> u32

The default ULPs to tolerate when testing values that are far-apart.

fn ulps_eq(&self, other: &Self, epsilon: T::Epsilon, max_ulps: u32) -> bool

A test for equality that uses units in the last place (ULP) if the values are far apart.

fn ulps_ne(&self, other: &Self, epsilon: T::Epsilon, max_ulps: u32) -> bool

The inverse of UlpsEq::ulps_eq.

impl<Wp, T, _A> WithAlpha<_A> for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint,
    _A: Component, 

type Color = Self

The opaque color type, without any transparency.

type WithAlpha = Alpha<Self, _A>

The color type with transparency applied.

fn with_alpha(self, alpha: _A) -> Self::WithAlpha

Transforms the color into a transparent color with the provided alpha value. If Self already has a transparency, it is overwritten.

fn without_alpha(self) -> Self::Color

Removes the transparency from the color. If Self::Color has an internal transparency field, that field will be set to A::max_intensity() to make it opaque.

fn split(self) -> (Self::Color, _A)

Splits the color into separate color and transparency values.

fn opaque(self) -> Self::WithAlpha

Transforms the color into a fully opaque color with a transparency field. If Self already has a transparency, it is overwritten.

fn transparent(self) -> Self::WithAlpha

Transforms the color into a fully transparent color. If Self already has a transparency, it is overwritten.

impl<Wp, T> Copy for Xyz<Wp, T> where
    T: FloatComponent,
    Wp: WhitePoint, 

impl<Wp, T> Eq for Xyz<Wp, T> where
    T: FloatComponent + Eq,
    Wp: WhitePoint,