Struct FontFeature 

pub struct FontFeature {
    pub tag: [u8; 4],
    pub value: u32,
}

An OpenType feature toggle applied during shaping.

tag is the 4-byte feature tag (e.g. *b"liga", *b"smcp", *b"tnum", *b"ss01"); value is the feature value — 0 disables it, 1 enables it, and some features (e.g. aalt) take an index.

Script-mandated features (Arabic joining, Indic reordering, etc.) always apply regardless of this list; these toggles control the discretionary typographic features a caller wants on or off.

Fields

tag: [u8; 4]

The 4-byte OpenType feature tag.

value: u32

Feature value: 0 = off, 1 = on, or a feature-specific index.

Implementations

impl FontFeature

pub const fn on(tag: [u8; 4]) -> Self

A feature tag turned on (value = 1).

pub const fn off(tag: [u8; 4]) -> Self

A feature tag turned off (value = 0).

pub const fn new(tag: [u8; 4], value: u32) -> Self

A feature tag with an explicit value.

Trait Implementations

impl Clone for FontFeature

fn clone(&self) -> FontFeature

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FontFeature

impl Debug for FontFeature

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

Formats the value using the given formatter.

impl Eq for FontFeature

impl Hash for FontFeature

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 FontFeature

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FontFeature