You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
195 lines
6.5 KiB
Racket
195 lines
6.5 KiB
Racket
#lang fontkit/racket
|
|
(require xenomorph)
|
|
(provide (all-defined-out))
|
|
|
|
#|
|
|
approximates
|
|
https://github.com/mbutterick/fontkit/blob/master/src/tables/opentype.js
|
|
|#
|
|
|
|
;;########################
|
|
;; Scripts and Languages #
|
|
;;########################
|
|
|
|
(define-subclass Array (FeatIdxArray))
|
|
|
|
(define LangSysTable (+Struct
|
|
(dictify 'reserved uint16be
|
|
'reqFeatureIndex uint16be
|
|
'featureCount uint16be
|
|
'featureIndexes (+FeatIdxArray uint16be 'featureCount))))
|
|
|
|
(define-subclass Pointer (LSR-Pointer))
|
|
(define LangSysRecord (+Struct
|
|
(dictify 'tag (+Symbol 4)
|
|
'langSys (+LSR-Pointer uint16be LangSysTable (mhash 'type 'parent)))))
|
|
|
|
(define-subclass Pointer (DLS-Pointer))
|
|
(define-subclass Array (DLS-Array))
|
|
(define Script (+Struct
|
|
(dictify 'defaultLangSys (+DLS-Pointer uint16be LangSysTable)
|
|
'count uint16be
|
|
'langSysRecords (+DLS-Array LangSysRecord 'count))))
|
|
|
|
(define-subclass Struct (ScriptRecord-Struct))
|
|
(define-subclass Pointer (ScriptRecord-Pointer))
|
|
(define ScriptRecord (+ScriptRecord-Struct
|
|
(dictify 'tag (+Symbol 4)
|
|
'script (+ScriptRecord-Pointer uint16be Script (mhash 'type 'parent)))))
|
|
|
|
(define ScriptList (+Array ScriptRecord uint16be))
|
|
|
|
;;#######################
|
|
;; Features and Lookups #
|
|
;;#######################
|
|
|
|
|
|
(define Feature (+Struct (dictify
|
|
'featureParams uint16be
|
|
'lookupCount uint16be
|
|
'lookupListIndexes (+Array uint16be 'lookupCount))))
|
|
|
|
(define-subclass Struct (FeatureRec))
|
|
(define-subclass Pointer (FeatureRec-Pointer))
|
|
(define FeatureRecord (+FeatureRec (dictify
|
|
'tag (+Symbol 4)
|
|
'feature (+FeatureRec-Pointer uint16be Feature (mhash 'type 'parent)))))
|
|
|
|
(define FeatureList (+Array FeatureRecord uint16be))
|
|
|
|
(define LookupFlags (+Bitfield uint16be '(rightToLeft ignoreBaseGlyphs ignoreLigatures ignoreMarks useMarkFilteringSet #f markAttachmentType)))
|
|
|
|
(define (LookupList SubTable)
|
|
(define Lookup (+Struct
|
|
(dictify
|
|
'lookupType uint16be
|
|
'flags LookupFlags
|
|
'subTableCount uint16be
|
|
'subTables (+Array (+Pointer uint16be SubTable) 'subTableCount)
|
|
'markFilteringSet uint16be)))
|
|
(+LazyArray (+Pointer uint16be Lookup) uint16be))
|
|
|
|
|
|
;;#################
|
|
;; Coverage Table #
|
|
;;#################
|
|
|
|
(define RangeRecord
|
|
(+Struct
|
|
(dictify
|
|
'start uint16be
|
|
'end uint16be
|
|
'startCoverageIndex uint16be)))
|
|
|
|
(define Coverage
|
|
(+VersionedStruct uint16be
|
|
(dictify
|
|
1 (dictify
|
|
'glyphCount uint16be
|
|
'glyphs (+Array uint16be 'glyphCount))
|
|
|
|
2 (dictify
|
|
'rangeCount uint16be
|
|
'rangeRecords (+Array RangeRecord 'rangeCount)))))
|
|
|
|
;;#########################
|
|
;; Class Definition Table #
|
|
;;#########################
|
|
|
|
(define ClassRangeRecord (+Struct
|
|
(dictify
|
|
'start uint16be
|
|
'end uint16be
|
|
'class uint16be)))
|
|
|
|
(define ClassDef (+VersionedStruct uint16be
|
|
(dictify
|
|
1 ;; Class array
|
|
(dictify
|
|
'startGlyph uint16be
|
|
'glyphCount uint16be
|
|
'classValueArray (+Array uint16be 'glyphCount))
|
|
2 ;; Class ranges
|
|
(dictify
|
|
'classRangeCount uint16be
|
|
'classRangeRecord (+Array ClassRangeRecord 'classRangeCount)))))
|
|
|
|
|
|
;;###############
|
|
;; Device Table #
|
|
;;###############
|
|
|
|
(define Device (+Struct
|
|
(dictify
|
|
'startSize uint16be
|
|
'endSize uint16be
|
|
'deltaFormat uint16be)))
|
|
|
|
;;#############################################
|
|
;; Contextual Substitution/Positioning Tables #
|
|
;;#############################################
|
|
|
|
|
|
(define LookupRecord (+Struct
|
|
(dictify
|
|
'sequenceIndex uint16be
|
|
'lookupListIndex uint16be)))
|
|
|
|
(define Context
|
|
(+VersionedStruct
|
|
uint16be
|
|
(dictify
|
|
;; Simple context
|
|
1 (dictify
|
|
'coverage (+Pointer uint16be 'Coverage)
|
|
'ruleSetCount uint16be
|
|
'ruleSets (+Array (+Pointer uint16be 'RuleSet) 'ruleSetCount))
|
|
|
|
;; Class-based context
|
|
2 (dictify
|
|
'coverage (+Pointer uint16be 'Coverage)
|
|
'classDef (+Pointer uint16be 'ClassDef)
|
|
'classSetCnt uint16be
|
|
'classSet (+Array (+Pointer uint16be 'ClassSet) 'classSetCnt))
|
|
|
|
3 (dictify
|
|
'glyphCount uint16be
|
|
'lookupCount uint16be
|
|
'coverages (+Array (+Pointer uint16be 'Coverage) 'glyphCount)
|
|
'lookupRecords (+Array LookupRecord 'lookupCount)))))
|
|
|
|
|
|
;;######################################################
|
|
;; Chaining Contextual Substitution/Positioning Tables #
|
|
;;######################################################
|
|
|
|
(define ChainingContext
|
|
(+VersionedStruct
|
|
uint16be
|
|
(dictify
|
|
;; Simple context glyph substitution
|
|
1 (dictify
|
|
'coverage (+Pointer uint16be 'Coverage)
|
|
'chainCount uint16be
|
|
'chainRuleSets (+Array (+Pointer uint16be 'ChainRuleSet) 'chainCount))
|
|
|
|
;; Class-based chaining context
|
|
2 (dictify
|
|
'coverage (+Pointer uint16be 'Coverage)
|
|
'backtrackClassDef (+Pointer uint16be 'ClassDef)
|
|
'inputClassDef (+Pointer uint16be 'ClassDef)
|
|
'lookaheadClassDef (+Pointer uint16be 'ClassDef)
|
|
'chainCount uint16be
|
|
'chainClassSet (+Array (+Pointer uint16be 'ChainRuleSet) 'chainCount))
|
|
|
|
;; Coverage-based chaining context
|
|
3 (dictify
|
|
'backtrackGlyphCount uint16be
|
|
'backtrackCoverage (+Array (+Pointer uint16be 'Coverage) 'backtrackGlyphCount)
|
|
'inputGlyphCount uint16be
|
|
'inputCoverage (+Array (+Pointer uint16be 'Coverage) 'inputGlyphCount)
|
|
'lookaheadGlyphCount uint16be
|
|
'lookaheadCoverage (+Array (+Pointer uint16be 'Coverage) 'lookaheadGlyphCount)
|
|
'lookupCount uint16be
|
|
'lookupRecords (+Array LookupRecord 'lookupCount)))))
|