Struct FontFeatures 

pub struct FontFeatures { /* private fields */ }

A set of OpenType features requested for shaping.

Stack-allocated for the common case of ≤4 features.

Implementations

impl FontFeatures

pub fn new() -> Self

Create an empty feature set.

pub fn push(&mut self, feature: FontFeature)

Add a feature to the set.

pub fn from_slice(features: &[FontFeature]) -> Self

Create from a slice of features.

pub fn len(&self) -> usize

Number of features.

pub fn is_empty(&self) -> bool

Whether the feature set is empty.

pub fn iter(&self) -> impl Iterator<Item = &FontFeature>

Iterate over features.

pub fn feature_value(&self, tag: [u8; 4]) -> Option<u32>

Return the value for a feature tag if present.

pub fn set_feature_value(&mut self, tag: [u8; 4], value: u32)

Insert or update a feature value by tag.

pub fn set_standard_ligatures(&mut self, enabled: bool)

Toggle standard ligature features (liga, clig).

This explicit toggle is used by capability-gated fallback code so ligature behavior stays deterministic across runtimes.

pub fn standard_ligatures_enabled(&self) -> Option<bool>

Return explicit standard-ligature state if configured.

• Some(true): all explicitly configured standard ligatures are on.
• Some(false): at least one explicit standard-ligature feature is off.
• None: no explicit standard-ligature feature was configured.

pub fn canonicalize(&mut self)

Sort features by tag for deterministic hashing.

Trait Implementations

impl Clone for FontFeatures

fn clone(&self) -> FontFeatures

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FontFeatures

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

Formats the value using the given formatter.

impl Default for FontFeatures

fn default() -> FontFeatures

Returns the “default value” for a type.

impl Hash for FontFeatures

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 FontFeatures

fn eq(&self, other: &FontFeatures) -> 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 Eq for FontFeatures

impl StructuralPartialEq for FontFeatures