Enum Blend 

#[non_exhaustive]
pub enum Blend {
    Clear,
    Source,
    Over,
    In,
    Out,
    Atop,
    Dest,
    DestOver,
    DestIn,
    DestOut,
    DestAtop,
    Xor,
    Add,
    Saturate,
    Multiply,
    Screen,
    Overlay,
    Darken,
    Lighten,
    ColourDodge,
    ColourBurn,
    HardLight,
    SoftLight,
    Difference,
    Exclusion,
}

How the overlay is combined with the base: sharp’s blend.

In the formulas, A is the overlay and B the base.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Clear

Nothing: the area under the overlay becomes transparent.

Source

The overlay replaces the base, alpha included.

Over

Porter-Duff source-over: the overlay is drawn on top of the base.

In

The overlay where the base is, transparent elsewhere.

Out

The overlay where the base is not.

Atop

The overlay over the base, kept to the base’s alpha.

Dest

The base alone: the overlay is ignored.

DestOver

The base over the overlay.

DestIn

The base where the overlay is.

DestOut

The base where the overlay is not: an overlay used as an eraser.

DestAtop

The base over the overlay, kept to the overlay’s alpha.

Xor

Each where the other is not.

Add

Colours and alphas summed.

Saturate

The overlay added only as far as the base has room for it.

Multiply

Colours multiplied: darkens.

Screen

Inverted colours multiplied: lightens.

Overlay

Multiply or screen, chosen by the base’s colour.

Darken

The darker of the two colours.

Lighten

The lighter of the two colours.

ColourDodge

The base brightened to reflect the overlay.

ColourBurn

The base darkened to reflect the overlay.

HardLight

Multiply or screen, chosen by the overlay’s colour.

SoftLight

A softer Blend::HardLight.

Difference

The absolute difference of the colours.

Exclusion

Blend::Difference with lower contrast.

Trait Implementations

impl Clone for Blend

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Blend

impl Debug for Blend

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

Formats the value using the given formatter.

impl Default for Blend

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Blend

impl Hash for Blend

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Blend

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Blend