Struct Expression 

pub struct Expression<S = Source> {
    pub sources: Vec<S>,
    pub terms: Vec<Term>,
}

A value per pixel as f32 operations on its sources (see the module): a weight channel’s over Sources, a layer’s colour lane over the lanes of its own colour (ColorLane).

Fields

sources: Vec<S>

The sources its Term::Source terms read, each once.

terms: Vec<Term>

Its terms, each after the terms it reads; the last is the value.

Implementations

impl<S: Clone + PartialEq + Serialize> Expression<S>

pub fn evaluate(&self, values: &[f32]) -> f32

Its value from its sources’ values (in Expression::sources order), under the module’s numeric rules.

pub fn canonical(&self) -> Result<Expression<S>, String>

Its canonical spelling (see the module), or why it has none: a term reading itself or a later term, a source that is not there, a constant that is not finite, no terms, or more than TERM_LIMIT once canonical.

pub fn check(&self) -> Result<(), String>

Its own checks (its sources’ apart): it is its canonical spelling. That it is no named form is Channel::check’s.

Trait Implementations

impl<S: Clone> Clone for Expression<S>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S: Debug> Debug for Expression<S>

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

Formats the value using the given formatter.

impl<S: PartialEq> PartialEq for Expression<S>

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

Equality operator ==.

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

Inequality operator !=.

impl<S> Serialize for Expression<S>

where S: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<S: PartialEq> StructuralPartialEq for Expression<S>