Type Alias Feature

pub type Feature<'a> = TableRef<'a, FeatureMarker>;

Feature Table

Aliased Type

struct Feature<'a> { /* private fields */ }

Implementations

impl<'a> Feature<'a>

pub fn read(data: FontData<'a>, feature_tag: Tag) -> Result<Self, ReadError>

A constructor that requires additional arguments.

This type requires some external state in order to be parsed.

impl<'a> Feature<'a>

pub fn feature_params_offset(&self) -> Nullable<Offset16>

Offset from start of Feature table to FeatureParams table, if defined for the feature and present, else NULL

pub fn feature_params(&self) -> Option<Result<FeatureParams<'a>, ReadError>>

Attempt to resolve feature_params_offset.

pub fn lookup_index_count(&self) -> u16

Number of LookupList indices for this feature

pub fn lookup_list_indices(&self) -> &'a [BigEndian<u16>]

Array of indices into the LookupList — zero-based (first lookup is LookupListIndex = 0)

impl<'a, T> TableRef<'a, T>

pub fn resolve_offset<O: Offset, R: FontRead<'a>>( &self, offset: O, ) -> Result<R, ReadError>

Resolve the provided offset from the start of this table.

pub fn offset_data(&self) -> FontData<'a>

Return a reference to this table’s raw data.

We use this in the compile crate to resolve offsets.

pub fn shape(&self) -> &T

Return a reference to the table’s ‘Shape’ struct.

This is a low level implementation detail, but it can be useful in some cases where you want to know things about a table’s layout, such as the byte offsets of specific fields.

Trait Implementations

impl<'a> FontReadWithArgs<'a> for Feature<'a>

fn read_with_args(data: FontData<'a>, args: &Tag) -> Result<Self, ReadError>

read an item, using the provided args.

impl ReadArgs for Feature<'_>

type Args = Tag

impl<'a, T: Clone> Clone for TableRef<'a, T>

fn clone(&self) -> TableRef<'a, T>

Returns a copy of the value.

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

Performs copy-assignment from source.