Trait nannou::color::Pixel

pub unsafe trait Pixel<T> {
    pub const CHANNELS: usize;
    pub fn as_raw<P>(&self) -> &P
    where
        P: RawPixel<T> + ?Sized,
    { ... }
    pub fn as_raw_mut<P>(&mut self) -> &mut P
    where
        P: RawPixel<T> + ?Sized,
    { ... }
    pub fn into_raw<P>(self) -> P
    where
        P: RawPixelSized<T>,
    { ... }
    pub fn from_raw<P>(pixel: &P) -> &Self
    where
        P: RawPixel<T> + ?Sized,
    { ... }
    pub fn from_raw_mut<P>(pixel: &mut P) -> &mut Self
    where
        P: RawPixel<T> + ?Sized,
    { ... }
    pub fn from_raw_slice(slice: &[T]) -> &[Self] { ... }
    pub fn from_raw_slice_mut(slice: &mut [T]) -> &mut [Self] { ... }
    pub fn into_raw_slice(slice: &[Self]) -> &[T] { ... }
    pub fn into_raw_slice_mut(slice: &mut [Self]) -> &mut [T] { ... }
}

Represents colors that can be serialized and deserialized from raw color components.

This uses bit by bit conversion, so make sure that anything that implements it can be represented as a contiguous sequence of a single type T. This is most safely done using #[derive(Pixel)].

Deriving

Pixel can be automatically derived. The only requirements are that the type is a struct, that it has a #[repr(C)] attribute, and that all of its fields have the same types. It stays on the conservative side and will show an error if any of those requirements are not fulfilled. If some fields have different types, but the same memory layout, or are zero-sized, they can be marked with attributes to show that their types are safe to use.

Field Attributes

• #[palette_unsafe_same_layout_as = "SomeType"]: Mark the field as having the same memory layout as SomeType.

  Unsafety: corrupt data and undefined behavior may occur if this is not true!

• #[palette_unsafe_zero_sized]: Mark the field as being zero-sized, and thus not taking up any memory space. This means that it can be ignored.

  Unsafety: corrupt data and undefined behavior may occur if this is not true!

Examples

Basic use:

#[macro_use]
extern crate palette;

use palette::Pixel;

#[derive(PartialEq, Debug, Pixel)]
#[repr(C)]
struct MyCmyk {
    cyan: f32,
    magenta: f32,
    yellow: f32,
    key: f32,
}

fn main() {
    let buffer = [0.1, 0.2, 0.3, 0.4];
    let color = MyCmyk::from_raw(&buffer);

    assert_eq!(
        color,
        &MyCmyk {
            cyan: 0.1,
            magenta: 0.2,
            yellow: 0.3,
            key: 0.4,
        }
    );
}

Heterogenous field types:

#[macro_use]
extern crate palette;

use std::marker::PhantomData;

use palette::{Pixel, RgbHue};
use palette::rgb::RgbStandard;
use palette::encoding::Srgb;

#[derive(PartialEq, Debug, Pixel)]
#[repr(C)]
struct MyCoolColor<S: RgbStandard> {
    #[palette_unsafe_zero_sized]
    standard: PhantomData<S>,
    // RgbHue is a wrapper with `#[repr(C)]`, so it can safely
    // be converted straight from `f32`.
    #[palette_unsafe_same_layout_as = "f32"]
    hue: RgbHue<f32>,
    lumen: f32,
    chroma: f32,
}

fn main() {
    let buffer = [172.0, 100.0, 0.3];
    let color = MyCoolColor::<Srgb>::from_raw(&buffer);

    assert_eq!(
        color,
        &MyCoolColor {
            hue: 172.0.into(),
            lumen: 100.0,
            chroma: 0.3,
            standard: PhantomData,
        }
    );
}

Associated Constants

pub const CHANNELS: usize

The number of color channels.

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Provided methods

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

Cast as a reference to raw color components.

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

Cast as a mutable reference to raw color components.

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

Convert from raw color components.

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

Cast from a reference to raw color components.

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

Cast from a mutable reference to raw color components.

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

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

use palette::{Pixel, Srgb};

let raw = &[255u8, 128, 64, 10, 20, 30];
let colors = Srgb::from_raw_slice(raw);

assert_eq!(colors.len(), 2);
assert_eq!(colors[0].blue, 64);
assert_eq!(colors[1].red, 10);

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

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

use palette::{Pixel, Srgb};

let raw = &mut [255u8, 128, 64, 10, 20, 30];
{
    let colors = Srgb::from_raw_slice_mut(raw);
    assert_eq!(colors.len(), 2);

    // These changes affects the raw slice, since they are the same data
    colors[0].blue = 100;
    colors[1].red = 200;
}

// Notice the two values in the middle:
assert_eq!(raw, &[255, 128, 100, 200, 20, 30]);

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

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

use palette::{Pixel, Srgb};

let colors = &[Srgb::new(255u8, 128, 64), Srgb::new(10, 20, 30)];
let raw = Srgb::into_raw_slice(colors);

assert_eq!(raw.len(), 6);
assert_eq!(raw, &[255u8, 128, 64, 10, 20, 30]);

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

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

use palette::{Pixel, Srgb};

let colors = &mut [Srgb::new(255u8, 128, 64), Srgb::new(10, 20, 30)];
{
    let raw = Srgb::into_raw_slice_mut(colors);
    assert_eq!(raw.len(), 6);

    // These changes affects the color slice, since they are the same data
    raw[2] = 100;
    raw[3] = 200;
}

assert_eq!(colors[0].blue, 100);
assert_eq!(colors[1].red, 200);

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Implementors

impl<S, T> Pixel<T> for Rgb<S, T> where
    S: RgbStandard,
    T: Component, 

pub const CHANNELS: usize

impl<S, T> Pixel<T> for Hsl<S, T> where
    S: RgbSpace,
    T: Component + Float, 

pub const CHANNELS: usize

impl<S, T> Pixel<T> for Hsv<S, T> where
    S: RgbSpace,
    T: Component + Float, 

pub const CHANNELS: usize

impl<S, T> Pixel<T> for Luma<S, T> where
    S: LumaStandard,
    T: Component, 

pub const CHANNELS: usize

impl<S, T> Pixel<T> for Hwb<S, T> where
    S: RgbSpace,
    T: Component + Float, 

pub const CHANNELS: usize

impl<T, C> Pixel<T> for PreAlpha<C, T> where
    C: Pixel<T>,
    T: Float, 

pub const CHANNELS: usize

impl<T, C> Pixel<T> for Alpha<C, T> where
    C: Pixel<T>, 

pub const CHANNELS: usize

impl<Wp, T> Pixel<T> for Lab<Wp, T> where
    T: Component + Float,
    Wp: WhitePoint, 

pub const CHANNELS: usize

impl<Wp, T> Pixel<T> for Lch<Wp, T> where
    T: Component + Float,
    Wp: WhitePoint, 

pub const CHANNELS: usize

impl<Wp, T> Pixel<T> for Xyz<Wp, T> where
    T: Component + Float,
    Wp: WhitePoint, 

pub const CHANNELS: usize

impl<Wp, T> Pixel<T> for Yxy<Wp, T> where
    T: Component + Float,
    Wp: WhitePoint, 

pub const CHANNELS: usize

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