Enum LayerBlend 

pub enum LayerBlend {
    Add,
    Screen,
    Multiply,
    Overlay,
}

How an over layer blends into the chain (ADR-0090): fixed at load, like every structural key, and applied in linear light within the layer’s premultiplied-alpha footprint. Parsed now; consumed by the blend pass (Plan 0076 Phase 3).

Variants

Add

Linear-light addition — the engine’s native compositing idiom.

Screen

1 - (1-a)(1-b): bounded brightening. The default — ADR-0090’s illustrative mode, and the one that cannot blow out.

Multiply

Darkens where the layer has coverage.

Overlay

Multiply below mid-grey, screen above.

Implementations

impl LayerBlend

pub const ALL: [LayerBlend; 4]

Every mode, for the load error’s “expected one of” listing.

pub fn from_name(name: &str) -> Option<Self>

Parse the canonical blend = "..." value, or None if unknown.

pub fn as_str(self) -> &'static str

The canonical name — from_name’s inverse.

Trait Implementations

impl Clone for LayerBlend

fn clone(&self) -> LayerBlend

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LayerBlend

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

Formats the value using the given formatter.

impl Default for LayerBlend

fn default() -> LayerBlend

Returns the “default value” for a type.

impl PartialEq for LayerBlend

fn eq(&self, other: &LayerBlend) -> 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 LayerBlend

impl Eq for LayerBlend

impl StructuralPartialEq for LayerBlend