all files / fontkit/src/tables/ opentype.coffee

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r = require 'restructure'
 
#########################
# Scripts and Languages #
#########################
 
LangSysTable = new r.Struct
  reserved:         new r.Reserved(r.uint16)
  reqFeatureIndex:  r.uint16
  featureCount:     r.uint16
  featureIndexes:   new r.Array(r.uint16, 'featureCount')
  
LangSysRecord = new r.Struct
  tag:      new r.String(4)
  langSys:  new r.Pointer(r.uint16, LangSysTable, type: 'parent')
  
Script = new r.Struct
  defaultLangSys: new r.Pointer(r.uint16, LangSysTable)
  count:          r.uint16
  langSysRecords: new r.Array(LangSysRecord, 'count')
  
ScriptRecord = new r.Struct
  tag:    new r.String(4)
  script: new r.Pointer(r.uint16, Script, type: 'parent')
 
exports.ScriptList = new r.Array(ScriptRecord, r.uint16)
 
########################
# Features and Lookups #
########################
 
Feature = new r.Struct
  featureParams:      r.uint16 # pointer
  lookupCount:        r.uint16
  lookupListIndexes:  new r.Array(r.uint16, 'lookupCount')
  
FeatureRecord = new r.Struct
  tag:      new r.String(4)
  feature:  new r.Pointer(r.uint16, Feature, type: 'parent')
 
exports.FeatureList = new r.Array(FeatureRecord, r.uint16)
 
LookupFlags = new r.Bitfield r.uint16, [
  'rightToLeft', 'ignoreBaseGlyphs', 'ignoreLigatures',
  'ignoreMarks', 'useMarkFilteringSet', null, 'markAttachmentType'
]
 
exports.LookupList = (SubTable) ->
  Lookup = new r.Struct
    lookupType:         r.uint16
    flags:              LookupFlags
    subTableCount:      r.uint16
    subTables:          new r.Array(new r.Pointer(r.uint16, SubTable), 'subTableCount')
    markFilteringSet:   r.uint16 # TODO: only present when flags says so...
      
  return new r.LazyArray new r.Pointer(r.uint16, Lookup), r.uint16
  
##################
# Coverage Table #
##################
  
RangeRecord = new r.Struct
  start:              r.uint16
  end:                r.uint16
  startCoverageIndex: r.uint16
  
Coverage = new r.VersionedStruct r.uint16,
  1: 
    glyphCount:   r.uint16
    glyphs:       new r.Array(r.uint16, 'glyphCount')
  2:
    rangeCount:   r.uint16
    rangeRecords: new r.Array(RangeRecord, 'rangeCount')
    
exports.Coverage = Coverage
    
##########################
# Class Definition Table #
##########################
    
ClassRangeRecord = new r.Struct
  start:  r.uint16
  end:    r.uint16
  class:  r.uint16
 
ClassDef = new r.VersionedStruct r.uint16,
  1: # Class array
    startGlyph:       r.uint16
    glyphCount:       r.uint16
    classValueArray:  new r.Array(r.uint16, 'glyphCount')
  2: # Class ranges
    classRangeCount:  r.uint16
    classRangeRecord: new r.Array(ClassRangeRecord, 'classRangeCount')
    
exports.ClassDef = ClassDef
      
################
# Device Table #
################
      
exports.Device = new r.Struct
  startSize:    r.uint16
  endSize:      r.uint16
  deltaFormat:  r.uint16
  
##############################################
# Contextual Substitution/Positioning Tables #
##############################################
  
LookupRecord = new r.Struct
  sequenceIndex:      r.uint16
  lookupListIndex:    r.uint16
  
Rule = new r.Struct
  glyphCount:     r.uint16
  lookupCount:    r.uint16
  input:          new r.Array(r.uint16, -> @glyphCount - 1)
  lookupRecords:  new r.Array(LookupRecord, 'lookupCount')
 
RuleSet = new r.Array(new r.Pointer(r.uint16, Rule), r.uint16)
 
ClassRule = new r.Struct
  glyphCount:     r.uint16
  lookupCount:    r.uint16
  classes:        new r.Array(r.uint16, -> @glyphCount - 1)
  lookupRecords:  new r.Array(LookupRecord, 'lookupCount')
      
ClassSet = new r.Array(new r.Pointer(r.uint16, ClassRule), r.uint16)
  
exports.Context = new r.VersionedStruct r.uint16,
  1: # Simple context
    coverage:      new r.Pointer(r.uint16, Coverage)
    ruleSetCount:  r.uint16
    ruleSets:      new r.Array(new r.Pointer(r.uint16, RuleSet), 'ruleSetCount')
  2: # Class-based context
    coverage:      new r.Pointer(r.uint16, Coverage)
    classDef:      new r.Pointer(r.uint16, ClassDef)
    classSetCnt:   r.uint16
    classSet:      new r.Array(new r.Pointer(r.uint16, ClassSet), 'classSetCnt')
  3:
    glyphCount:    r.uint16
    lookupCount:   r.uint16
    coverages:     new r.Array(new r.Pointer(r.uint16, Coverage), 'glyphCount')
    lookupRecords: new r.Array(LookupRecord, 'lookupCount')
    
#######################################################
# Chaining Contextual Substitution/Positioning Tables #
#######################################################
    
ChainRule = new r.Struct
  backtrackGlyphCount:  r.uint16
  backtrack:            new r.Array(r.uint16, 'backtrackGlyphCount')
  inputGlyphCount:      r.uint16
  input:                new r.Array(r.uint16, -> @inputGlyphCount - 1)
  lookaheadGlyphCount:  r.uint16
  lookahead:            new r.Array(r.uint16, 'lookaheadGlyphCount')
  lookupCount:          r.uint16
  lookupRecords:        new r.Array(LookupRecord, 'lookupCount')
 
ChainRuleSet = new r.Array(new r.Pointer(r.uint16, ChainRule), r.uint16)
 
exports.ChainingContext = new r.VersionedStruct r.uint16,
  1: # Simple context glyph substitution
    coverage:           new r.Pointer(r.uint16, Coverage)
    chainCount:         r.uint16
    chainRuleSets:      new r.Array(new r.Pointer(r.uint16, ChainRuleSet), 'chainCount')
    
  2: # Class-based chaining context
    coverage:           new r.Pointer(r.uint16, Coverage)
    backtrackClassDef:  new r.Pointer(r.uint16, ClassDef)
    inputClassDef:      new r.Pointer(r.uint16, ClassDef)
    lookaheadClassDef:  new r.Pointer(r.uint16, ClassDef)
    chainCount:         r.uint16
    chainClassSet:      new r.Array(new r.Pointer(r.uint16, ChainRuleSet), 'chainCount')
    
  3: # Coverage-based chaining context 
    backtrackGlyphCount:    r.uint16
    backtrackCoverage:      new r.Array(new r.Pointer(r.uint16, Coverage), 'backtrackGlyphCount')
    inputGlyphCount:        r.uint16
    inputCoverage:          new r.Array(new r.Pointer(r.uint16, Coverage), 'inputGlyphCount')
    lookaheadGlyphCount:    r.uint16
    lookaheadCoverage:      new r.Array(new r.Pointer(r.uint16, Coverage), 'lookaheadGlyphCount')
    lookupCount:            r.uint16
    lookupRecords:          new r.Array(LookupRecord, 'lookupCount')