Trait image::imageops::colorops::ColorMap

pub trait ColorMap {
    type Color;
    fn index_of(&self, color: &Self::Color) -> usize;
    fn map_color(&self, color: &mut Self::Color);

    fn lookup(&self, index: usize) -> Option<Self::Color> { ... }
    fn has_lookup(&self) -> bool { ... }
}

A color map

Associated Types

type Color

The color type on which the map operates on

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Required methods

fn index_of(&self, color: &Self::Color) -> usize

Returns the index of the closest match of color in the color map.

fn map_color(&self, color: &mut Self::Color)

Maps color to the closest color in the color map.

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Provided methods

fn lookup(&self, index: usize) -> Option<Self::Color>

Looks up color by index in the color map. If idx is out of range for the color map, or ColorMap doesn’t implement lookup None is returned.

fn has_lookup(&self) -> bool

Determine if this implementation of ColorMap overrides the default lookup.

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Implementations on Foreign Types

impl ColorMap for NeuQuant

type Color = Rgba<u8>

fn index_of(&self, color: &Rgba<u8>) -> usize

fn lookup(&self, idx: usize) -> Option<Self::Color>

fn has_lookup(&self) -> bool

Indicate NeuQuant implements lookup.

fn map_color(&self, color: &mut Rgba<u8>)

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Implementors

impl ColorMap for image::math::nq::NeuQuant

type Color = Rgba<u8>

fn index_of(&self, color: &Rgba<u8>) -> usize

fn lookup(&self, idx: usize) -> Option<Self::Color>

fn has_lookup(&self) -> bool

Indicate NeuQuant implements lookup.

fn map_color(&self, color: &mut Rgba<u8>)

impl ColorMap for BiLevel

type Color = Luma<u8>

fn index_of(&self, color: &Luma<u8>) -> usize

fn lookup(&self, idx: usize) -> Option<Self::Color>

fn has_lookup(&self) -> bool

Indicate NeuQuant implements lookup.

fn map_color(&self, color: &mut Luma<u8>)

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