Enum BlendMode

pub enum BlendMode {
    Normal,
    PlusLighter,
    Overlay,
    Multiply,
    Screen,
}

How a shadow composites against the layers below it.

All modes assume premultiplied colour and alpha. The GPU pipeline is expected to be premul-correct; the software pipeline must premultiply before applying these formulas.

Variants

Normal

Standard src-over: result = src + dst × (1 − src.a).

PlusLighter

CSS plus-lighter: result = min(1, src + dst), channel-wise on premultiplied values. Adds light; never darkens.

Overlay

Overlay (multiply on dark base, screen on light base). Preserves the base’s luminance while pushing local contrast.

Multiply

Multiplicative blend: result = src × dst. Only darkens.

Screen

Screen blend: result = 1 − (1 − src) × (1 − dst). Only lightens.

Trait Implementations

impl Clone for BlendMode

fn clone(&self) -> BlendMode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BlendMode

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

Formats the value using the given formatter.

impl Default for BlendMode

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for BlendMode

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for BlendMode

impl Eq for BlendMode

impl StructuralPartialEq for BlendMode