@pdfa-lab/fontkit / GSUBProcessor

Class: GSUBProcessor<T>

Defined in: src/open-type/gsub-processor.ts:11

Applies OpenType GSUB lookups (substitutions) to a glyph buffer. Supports lookup types 1–7, delegating contextual (5) and chaining contextual (6) lookups to OTProcessor, and recursively resolving extension substitutions (7).

Extends

• OpenTypeProcessor<T>

Type Parameters

Type Parameter
T

Constructors

Constructor

new GSUBProcessor<T>(font, table): GSUBProcessor<T>

Defined in: src/open-type/open-type-processor.ts:35

Parameters

Parameter	Type
font	TrueTypeFont
table	GPOS | GSUB

Returns

GSUBProcessor<T>

Inherited from

OpenTypeProcessor.constructor

Properties

Property	Modifier	Type	Inherited from	Defined in
direction	protected	BidiDirection | undefined	OpenTypeProcessor.direction	src/open-type/open-type-processor.ts:32
features	public	Partial<Record<FeatureTag, Feature>>	OpenTypeProcessor.features	src/open-type/open-type-processor.ts:26
font	protected	TrueTypeFont	OpenTypeProcessor.font	src/open-type/open-type-processor.ts:20
glyphIterator	protected	GlyphIterator<T> | undefined	OpenTypeProcessor.glyphIterator	src/open-type/open-type-processor.ts:33
glyphs	protected	GlyphInfo<T>[]	OpenTypeProcessor.glyphs	src/open-type/open-type-processor.ts:28
ligatureID	protected	number	OpenTypeProcessor.ligatureID	src/open-type/open-type-processor.ts:30
positions?	protected	GlyphPosition[]	OpenTypeProcessor.positions	src/open-type/open-type-processor.ts:29

Methods

applyChainingContext()

protected applyChainingContext(table): boolean

Defined in: src/open-type/open-type-processor.ts:491

Parameters

Parameter	Type
table	ChainingContext

Returns

boolean

Inherited from

OpenTypeProcessor.applyChainingContext

---

applyContext()

protected applyContext(table): boolean

Defined in: src/open-type/open-type-processor.ts:439

Parameters

Parameter	Type
table	Context

Returns

boolean

Inherited from

OpenTypeProcessor.applyContext

---

applyFeatures()

applyFeatures(userFeatures, glyphs, advances?): void

Defined in: src/open-type/open-type-processor.ts:242

Parameters

Parameter	Type
userFeatures	keyof Features[]
glyphs	GlyphInfo<T>[]
advances?	GlyphPosition[]

Returns

void

Inherited from

OpenTypeProcessor.applyFeatures

---

applyLookup()

applyLookup(lookupType, table): boolean

Defined in: src/open-type/gsub-processor.ts:12

Parameters

Parameter	Type
lookupType	number
table	LookupTable

Returns

boolean

Overrides

OpenTypeProcessor.applyLookup

---

coverageIndex()

protected coverageIndex(coverage, glyph?): number

Defined in: src/open-type/open-type-processor.ts:317

Parameters

Parameter	Type
coverage	Coverage
glyph?	number

Returns

number

Inherited from

OpenTypeProcessor.coverageIndex

---

getClassID()

getClassID(glyph, classDef): number

Defined in: src/open-type/open-type-processor.ts:402

Parameters

Parameter	Type
glyph	number
classDef	ClassDef

Returns

number

Inherited from

OpenTypeProcessor.getClassID

---

selectScript()

selectScript(script?, language?, direction?): string | null

Defined in: src/open-type/open-type-processor.ts:82

Parameters

Parameter	Type
script?	string
language?	string | null
direction?	BidiDirection

Returns

string | null

Inherited from

OpenTypeProcessor.selectScript

---

sequenceMatchIndices()

protected sequenceMatchIndices(sequenceIndex, sequence): boolean | number[]

Defined in: src/open-type/open-type-processor.ts:374

Parameters

Parameter	Type
sequenceIndex	number
sequence	number[]

Returns

boolean | number[]

Inherited from

OpenTypeProcessor.sequenceMatchIndices