Struct PairPosFormat4 

pub struct PairPosFormat4<'a> {
    data: TableDataRef<'a, PairPosFormat4FixedHeader>,
}

PairPosFormat4 (ISO/IEC 14496-22:2026).

Fields

data: TableDataRef<'a, PairPosFormat4FixedHeader>

Implementations

impl<'a> PairPosFormat4<'a>

pub const MIN_SIZE: usize

pub fn resolve_offset<O: Offset, R: FontRead<'a, Args = ()>>( &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 pos_format(&self) -> u16

Format identifier: format = 4

pub fn coverage_offset(&self) -> Offset32

Offset to Coverage table, from beginning of PairPos subtable.

pub fn coverage(&self) -> Result<CoverageTable<'a>, ReadError>

Attempt to resolve coverage_offset.

pub fn value_format1(&self) -> ValueFormat

ValueRecord definition — for the first glyph of the pair (may be zero).

pub fn value_format2(&self) -> ValueFormat

ValueRecord definition — for the second glyph of the pair (may be zero).

pub fn class_def1_offset(&self) -> Offset32

Offset to ClassDef table, from beginning of PairPos subtable — for the first glyph of the pair.

pub fn class_def1(&self) -> Result<ClassDef<'a>, ReadError>

Attempt to resolve class_def1_offset.

pub fn class_def2_offset(&self) -> Offset32

Offset to ClassDef table, from beginning of PairPos subtable — for the second glyph of the pair.

pub fn class_def2(&self) -> Result<ClassDef<'a>, ReadError>

Attempt to resolve class_def2_offset.

pub fn class1_count(&self) -> u16

Number of classes in classDef1 table — includes Class 0.

pub fn class2_count(&self) -> u16

Number of classes in classDef2 table — includes Class 0.

pub fn class1_records(&self) -> ComputedArray<'a, Class1Record<'a>>

Array of Class1 records, ordered by classes in classDef1.

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

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

pub fn value_format1_byte_range(&self) -> Range<usize>

pub fn value_format2_byte_range(&self) -> Range<usize>

pub fn class_def1_offset_byte_range(&self) -> Range<usize>

pub fn class_def2_offset_byte_range(&self) -> Range<usize>

pub fn class1_count_byte_range(&self) -> Range<usize>

pub fn class2_count_byte_range(&self) -> Range<usize>

pub fn class1_records_byte_range(&self) -> Range<usize>

impl<'a> PairPosFormat4<'a>

pub fn class_value_records(&self) -> ClassValueRecords<'a>

Returns the two-dimensional array of class value records, located but not read.

pub fn value_record_refs( &self, class1: u16, class2: u16, ) -> Option<[ValueRecord<'a>; 2]>

Returns the pair of value records for the given classes, located but not read.

Returns None if either class is out of range. When reading more than one class pair, prefer class_value_records, which reads the table’s counts and formats only once.

Trait Implementations

impl<'a> Clone for PairPosFormat4<'a>

fn clone(&self) -> PairPosFormat4<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> FontRead<'a> for PairPosFormat4<'a>

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

Read an item, performing validation.

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

where Self: FontRead<'a, Args = ()>,

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

impl Format<u16> for PairPosFormat4<'_>

const FORMAT: u16 = 4

The format value for this table.

impl Intersect for PairPosFormat4<'_>

fn intersects(&self, glyphs: &IntSet<GlyphId>) -> Result<bool, ReadError>

impl<'a> MinByteRange<'a> for PairPosFormat4<'a>

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

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

impl ReadArgs for PairPosFormat4<'_>

type Args = ()