Struct Gsub 

pub struct Gsub<'a> {
    data: FontData<'a>,
}

GSUB

Fields

data: FontData<'a>

Implementations

impl Gsub<'_>

pub fn closure_glyphs( &self, lookups: &IntSet<u16>, glyphs: &mut IntSet<GlyphId>, ) -> Result<(), ReadError>

Return the set of glyphs reachable from the input set via any substitution. ref: https://github.com/harfbuzz/harfbuzz/blob/8d517f7e43f648cb804c46c47ae8009330fe4a47/src/hb-ot-layout.cc#L1616

pub fn collect_lookups( &self, feature_indices: &IntSet<u16>, ) -> Result<IntSet<u16>, ReadError>

Return a set of lookups referenced by the specified features

Pass &IntSet::all() to get the lookups referenced by all features.

pub fn collect_features( &self, scripts: &IntSet<Tag>, languages: &IntSet<Tag>, features: &IntSet<Tag>, ) -> Result<IntSet<u16>, ReadError>

Return a set of all feature indices underneath the specified scripts, languages and features

pub fn closure_lookups( &self, glyphs: &IntSet<GlyphId>, lookup_indices: &mut IntSet<u16>, ) -> Result<(), ReadError>

Update the set of lookup indices with all lookups reachable from specified glyph set and lookup_indices.

impl<'a> Gsub<'a>

pub const MIN_SIZE: usize

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) -> &Self

👎Deprecated: just use the base type directly

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.

pub fn version(&self) -> MajorMinor

The major and minor version of the GSUB table, as a tuple (u16, u16)

pub fn script_list_offset(&self) -> Offset16

Offset to ScriptList table, from beginning of GSUB table

pub fn script_list(&self) -> Result<ScriptList<'a>, ReadError>

Attempt to resolve script_list_offset.

pub fn feature_list_offset(&self) -> Offset16

Offset to FeatureList table, from beginning of GSUB table

pub fn feature_list(&self) -> Result<FeatureList<'a>, ReadError>

Attempt to resolve feature_list_offset.

pub fn lookup_list_offset(&self) -> Offset16

Offset to LookupList table, from beginning of GSUB table

pub fn lookup_list(&self) -> Result<SubstitutionLookupList<'a>, ReadError>

Attempt to resolve lookup_list_offset.

pub fn feature_variations_offset(&self) -> Option<Nullable<Offset32>>

Offset to FeatureVariations table, from beginning of the GSUB table (may be NULL)

pub fn feature_variations( &self, ) -> Option<Result<FeatureVariations<'a>, ReadError>>

Attempt to resolve feature_variations_offset.

pub fn version_byte_range(&self) -> Range<usize>

pub fn script_list_offset_byte_range(&self) -> Range<usize>

pub fn feature_list_offset_byte_range(&self) -> Range<usize>

pub fn lookup_list_offset_byte_range(&self) -> Range<usize>

pub fn feature_variations_offset_byte_range(&self) -> Range<usize>

Trait Implementations

impl<'a> Clone for Gsub<'a>

fn clone(&self) -> Gsub<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> FontRead<'a> for Gsub<'a>

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

Read an instance of Self from the provided data, performing validation.

impl<'a> MinByteRange<'a> for Gsub<'a>

fn min_byte_range(&self) -> Range<usize>

fn min_table_bytes(&self) -> &'a [u8]

impl TopLevelTable for Gsub<'_>

const TAG: Tag

GSUB