Enum ttf_parser::opentype_layout::ChainedContextLookup

pub enum ChainedContextLookup<'a> {
    Format1 {
        coverage: Coverage<'a>,
        sets: ChainedSequenceRuleSets<'a>,
    },
    Format2 {
        coverage: Coverage<'a>,
        backtrack_classes: ClassDefinition<'a>,
        input_classes: ClassDefinition<'a>,
        lookahead_classes: ClassDefinition<'a>,
        sets: ChainedSequenceRuleSets<'a>,
    },
    Format3 {
        coverage: Coverage<'a>,
        backtrack_coverages: LazyOffsetArray16<'a, Coverage<'a>>,
        input_coverages: LazyOffsetArray16<'a, Coverage<'a>>,
        lookahead_coverages: LazyOffsetArray16<'a, Coverage<'a>>,
        lookups: LazyArray16<'a, SequenceLookupRecord>,
    },
}

A Chained Contextual Lookup Subtable.

Variants

Format1

Simple glyph contexts.

Fields

coverage: Coverage<'a>

sets: ChainedSequenceRuleSets<'a>

Format2

Class-based glyph contexts.

Fields

coverage: Coverage<'a>

backtrack_classes: ClassDefinition<'a>

input_classes: ClassDefinition<'a>

lookahead_classes: ClassDefinition<'a>

sets: ChainedSequenceRuleSets<'a>

Format3

Coverage-based glyph contexts.

Fields

coverage: Coverage<'a>

backtrack_coverages: LazyOffsetArray16<'a, Coverage<'a>>

input_coverages: LazyOffsetArray16<'a, Coverage<'a>>

lookahead_coverages: LazyOffsetArray16<'a, Coverage<'a>>

lookups: LazyArray16<'a, SequenceLookupRecord>

Implementations

impl<'a> ChainedContextLookup<'a>

pub(crate) fn parse(data: &'a [u8]) -> Option<Self>

pub fn coverage(&self) -> Coverage<'a>

Returns the subtable coverage.

Trait Implementations

impl<'a> Clone for ChainedContextLookup<'a>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for ChainedContextLookup<'a>

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

Formats the value using the given formatter.

impl<'a> Copy for ChainedContextLookup<'a>