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farewell

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Matthew Butterick 6 years ago
parent 0ea63c0144
commit 5093cd8fef
3 changed files with 0 additions and 198 deletions
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1
fontland/fontland/info.rkt
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#lang info

1
fontland/fontland/main.rkt
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#lang racket/base
(require "racket.rkt")
(r+p "font.rkt"
"glyph-position.rkt"
"subset.rkt"

196
fontland/fontland/opentype.rkt
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#lang racket/base
(require "racket.rkt")
(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)))))
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