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ot_aat_layout.go
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package harfbuzz
import (
"fmt"
"github.com/benoitkugler/textlayout/fonts"
tt "github.com/benoitkugler/textlayout/fonts/truetype"
)
// ported from harfbuzz/src/hb-aat-layout.h Copyright © 2018 Ebrahim Byagowi, Behdad Esfahbod
// The possible feature types defined for AAT shaping,
// from https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html
type aatLayoutFeatureType = uint16
const (
// Initial, unset feature type
// aatLayoutFeatureTypeInvalid = 0xFFFF
// [All Typographic Features](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type0)
// aatLayoutFeatureTypeAllTypographic = 0
// [Ligatures](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type1)
aatLayoutFeatureTypeLigatures = 1
// [Cursive Connection](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type2)
// aatLayoutFeatureTypeCurisveConnection = 2
// [Letter Case](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type3)
aatLayoutFeatureTypeLetterCase = 3
// [Vertical Substitution](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type4)
aatLayoutFeatureTypeVerticalSubstitution = 4
// [Linguistic Rearrangement](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type5)
// aatLayoutFeatureTypeLinguisticRearrangement = 5
// [Number Spacing](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type6)
aatLayoutFeatureTypeNumberSpacing = 6
// [Smart Swash](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type8)
// aatLayoutFeatureTypeSmartSwashType = 8
// [Diacritics](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type9)
// aatLayoutFeatureTypeDiacriticsType = 9
// [Vertical Position](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type10)
aatLayoutFeatureTypeVerticalPosition = 10
// [Fractions](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type11)
aatLayoutFeatureTypeFractions = 11
// [Overlapping Characters](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type13)
// aatLayoutFeatureTypeOverlappingCharactersType = 13
// [Typographic Extras](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type14)
aatLayoutFeatureTypeTypographicExtras = 14
// [Mathematical Extras](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type15)
aatLayoutFeatureTypeMathematicalExtras = 15
// [Ornament Sets](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type16)
// aatLayoutFeatureTypeOrnamentSetsType = 16
// [Character Alternatives](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type17)
aatLayoutFeatureTypeCharacterAlternatives = 17
// [Design Complexity](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type18)
aatLayoutFeatureTypeDesignComplexityType = 18
// [Style Options](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type19)
aatLayoutFeatureTypeStyleOptions = 19
// [Character Shape](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type20)
aatLayoutFeatureTypeCharacterShape = 20
// [Number Case](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type21)
aatLayoutFeatureTypeNumberCase = 21
// [Text Spacing](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type22)
aatLayoutFeatureTypeTextSpacing = 22
// [Transliteration](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type23)
aatLayoutFeatureTypeTransliteration = 23
// [Annotation](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type24)
aatLayoutFeatureTypeAnnotationType = 24
// [Kana Spacing](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type25)
aatLayoutFeatureTypeKanaSpacingType = 25
// [Ideographic Spacing](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type26)
aatLayoutFeatureTypeIdeographicSpacingType = 26
// [Unicode Decomposition](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type27)
aatLayoutFeatureTypeUnicodeDecompositionType = 27
// [Ruby Kana](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type28)
aatLayoutFeatureTypeRubyKana = 28
// [CJK Symbol Alternatives](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type29)
aatLayoutFeatureTypeCjkSymbolAlternativesType = 29
// [Ideographic Alternatives](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type30)
aatLayoutFeatureTypeIdeographicAlternativesType = 30
// [CJK Vertical Roman Placement](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type31)
aatLayoutFeatureTypeCjkVerticalRomanPlacementType = 31
// [Italic CJK Roman](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type32)
aatLayoutFeatureTypeItalicCjkRoman = 32
// [Case Sensitive Layout](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type33)
aatLayoutFeatureTypeCaseSensitiveLayout = 33
// [Alternate Kana](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type34)
aatLayoutFeatureTypeAlternateKana = 34
// [Stylistic Alternatives](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type35)
aatLayoutFeatureTypeStylisticAlternatives = 35
// [Contextual Alternatives](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type36)
aatLayoutFeatureTypeContextualAlternatives = 36
// [Lower Case](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type37)
aatLayoutFeatureTypeLowerCase = 37
// [Upper Case](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type38)
aatLayoutFeatureTypeUpperCase = 38
// [Language Tag](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type39)
aatLayoutFeatureTypeLanguageTagType = 39
// [CJK Roman Spacing](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type103)
aatLayoutFeatureTypeCjkRomanSpacingType = 103
)
// The selectors defined for specifying AAT feature settings.
type aatLayoutFeatureSelector = uint16
const (
// Initial, unset feature selector
aatLayoutFeatureSelectorInvalid = 0xFFFF
/* Selectors for #aatLayoutFeatureTypeAllTypographic */
// for #aatLayoutFeatureTypeAllTypographic
aatLayoutFeatureSelectorAllTypeFeaturesOn = 0
// for #aatLayoutFeatureTypeAllTypographic
aatLayoutFeatureSelectorAllTypeFeaturesOff = 1
/* Selectors for #aatLayoutFeatureTypeLigatures */
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorRequiredLigaturesOn = 0
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorRequiredLigaturesOff = 1
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorCommonLigaturesOn = 2
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorCommonLigaturesOff = 3
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorRareLigaturesOn = 4
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorRareLigaturesOff = 5
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorLogosOn = 6
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorLogosOff = 7
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorRebusPicturesOn = 8
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorRebusPicturesOff = 9
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorDiphthongLigaturesOn = 10
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorDiphthongLigaturesOff = 11
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorSquaredLigaturesOn = 12
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorSquaredLigaturesOff = 13
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorAbbrevSquaredLigaturesOn = 14
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorAbbrevSquaredLigaturesOff = 15
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorSymbolLigaturesOn = 16
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorSymbolLigaturesOff = 17
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorContextualLigaturesOn = 18
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorContextualLigaturesOff = 19
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorHistoricalLigaturesOn = 20
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorHistoricalLigaturesOff = 21
/* Selectors for #aatLayoutFeatureTypeLigatures */
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorUnconnected = 0
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorPartiallyConnected = 1
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorCursive = 2
/* Selectors for #aatLayoutFeatureTypeLetterCase */
// Deprecated
aatLayoutFeatureSelectorUpperAndLowerCase = 0 /* deprecated */
// Deprecated
aatLayoutFeatureSelectorAllCaps = 1 /* deprecated */
// Deprecated
aatLayoutFeatureSelectorAllLowerCase = 2 /* deprecated */
// Deprecated
aatLayoutFeatureSelectorSmallCaps = 3 /* deprecated */
// Deprecated
aatLayoutFeatureSelectorInitialCaps = 4 /* deprecated */
// Deprecated
aatLayoutFeatureSelectorInitialCapsAndSmallCaps = 5 /* deprecated */
/* Selectors for #aatLayoutFeatureTypeVerticalSubstitution */
// for #aatLayoutFeatureTypeVerticalSubstitution
aatLayoutFeatureSelectorSubstituteVerticalFormsOn = 0
// for #aatLayoutFeatureTypeVerticalSubstitution
aatLayoutFeatureSelectorSubstituteVerticalFormsOff = 1
/* Selectors for #aatLayoutFeatureTypeLinguisticRearrangement */
// for #aatLayoutFeatureTypeLinguisticRearrangement
aatLayoutFeatureSelectorLinguisticRearrangementOn = 0
// for #aatLayoutFeatureTypeLinguisticRearrangement
aatLayoutFeatureSelectorLinguisticRearrangementOff = 1
/* Selectors for #aatLayoutFeatureTypeNumberSpacing */
// for #aatLayoutFeatureTypeNumberSpacing
aatLayoutFeatureSelectorMonospacedNumbers = 0
// for #aatLayoutFeatureTypeNumberSpacing
aatLayoutFeatureSelectorProportionalNumbers = 1
// for #aatLayoutFeatureTypeNumberSpacing
aatLayoutFeatureSelectorThirdWidthNumbers = 2
// for #aatLayoutFeatureTypeNumberSpacing
aatLayoutFeatureSelectorQuarterWidthNumbers = 3
/* Selectors for #aatLayoutFeatureTypeSmartSwashType */
// for #aatLayoutFeatureTypeSmartSwashType
aatLayoutFeatureSelectorWordInitialSwashesOn = 0
// for #aatLayoutFeatureTypeSmartSwashType
aatLayoutFeatureSelectorWordInitialSwashesOff = 1
// for #aatLayoutFeatureTypeSmartSwashType
aatLayoutFeatureSelectorWordFinalSwashesOn = 2
// for #aatLayoutFeatureTypeSmartSwashType
aatLayoutFeatureSelectorWordFinalSwashesOff = 3
// for #aatLayoutFeatureTypeSmartSwashType
aatLayoutFeatureSelectorLineInitialSwashesOn = 4
// for #aatLayoutFeatureTypeSmartSwashType
aatLayoutFeatureSelectorLineInitialSwashesOff = 5
// for #aatLayoutFeatureTypeSmartSwashType
aatLayoutFeatureSelectorLineFinalSwashesOn = 6
// for #aatLayoutFeatureTypeSmartSwashType
aatLayoutFeatureSelectorLineFinalSwashesOff = 7
// for #aatLayoutFeatureTypeSmartSwashType
aatLayoutFeatureSelectorNonFinalSwashesOn = 8
// for #aatLayoutFeatureTypeSmartSwashType
aatLayoutFeatureSelectorNonFinalSwashesOff = 9
/* Selectors for #aatLayoutFeatureTypeDiacriticsType */
// for #aatLayoutFeatureTypeDiacriticsType
aatLayoutFeatureSelectorShowDiacritics = 0
// for #aatLayoutFeatureTypeDiacriticsType
aatLayoutFeatureSelectorHideDiacritics = 1
// for #aatLayoutFeatureTypeDiacriticsType
aatLayoutFeatureSelectorDecomposeDiacritics = 2
/* Selectors for #aatLayoutFeatureTypeVerticalPosition */
// for #aatLayoutFeatureTypeVerticalPosition
aatLayoutFeatureSelectorNormalPosition = 0
// for #aatLayoutFeatureTypeVerticalPosition
aatLayoutFeatureSelectorSuperiors = 1
// for #aatLayoutFeatureTypeVerticalPosition
aatLayoutFeatureSelectorInferiors = 2
// for #aatLayoutFeatureTypeVerticalPosition
aatLayoutFeatureSelectorOrdinals = 3
// for #aatLayoutFeatureTypeVerticalPosition
aatLayoutFeatureSelectorScientificInferiors = 4
/* Selectors for #aatLayoutFeatureTypeFractions */
// for #aatLayoutFeatureTypeFractions
aatLayoutFeatureSelectorNoFractions = 0
// for #aatLayoutFeatureTypeFractions
aatLayoutFeatureSelectorVerticalFractions = 1
// for #aatLayoutFeatureTypeFractions
aatLayoutFeatureSelectorDiagonalFractions = 2
/* Selectors for #aatLayoutFeatureTypeOverlappingCharactersType */
// for #aatLayoutFeatureTypeOverlappingCharactersType
aatLayoutFeatureSelectorPreventOverlapOn = 0
// for #aatLayoutFeatureTypeOverlappingCharactersType
aatLayoutFeatureSelectorPreventOverlapOff = 1
/* Selectors for #aatLayoutFeatureTypeTypographicExtras */
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorHyphensToEmDashOn = 0
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorHyphensToEmDashOff = 1
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorHyphenToEnDashOn = 2
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorHyphenToEnDashOff = 3
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorSlashedZeroOn = 4
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorSlashedZeroOff = 5
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorFormInterrobangOn = 6
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorFormInterrobangOff = 7
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorSmartQuotesOn = 8
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorSmartQuotesOff = 9
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorPeriodsToEllipsisOn = 10
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorPeriodsToEllipsisOff = 11
/* Selectors for #aatLayoutFeatureTypeMathematicalExtras */
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorHyphenToMinusOn = 0
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorHyphenToMinusOff = 1
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorAsteriskToMultiplyOn = 2
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorAsteriskToMultiplyOff = 3
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorSlashToDivideOn = 4
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorSlashToDivideOff = 5
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorInequalityLigaturesOn = 6
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorInequalityLigaturesOff = 7
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorExponentsOn = 8
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorExponentsOff = 9
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorMathematicalGreekOn = 10
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorMathematicalGreekOff = 11
/* Selectors for #aatLayoutFeatureTypeOrnamentSetsType */
// for #aatLayoutFeatureTypeOrnamentSetsType
aatLayoutFeatureSelectorNoOrnaments = 0
// for #aatLayoutFeatureTypeOrnamentSetsType
aatLayoutFeatureSelectorDingbats = 1
// for #aatLayoutFeatureTypeOrnamentSetsType
aatLayoutFeatureSelectorPiCharacters = 2
// for #aatLayoutFeatureTypeOrnamentSetsType
aatLayoutFeatureSelectorFleurons = 3
// for #aatLayoutFeatureTypeOrnamentSetsType
aatLayoutFeatureSelectorDecorativeBorders = 4
// for #aatLayoutFeatureTypeOrnamentSetsType
aatLayoutFeatureSelectorInternationalSymbols = 5
// for #aatLayoutFeatureTypeOrnamentSetsType
aatLayoutFeatureSelectorMathSymbols = 6
/* Selectors for #aatLayoutFeatureTypeCharacterAlternatives */
// for #aatLayoutFeatureTypeCharacterAlternatives
aatLayoutFeatureSelectorNoAlternates = 0
/* Selectors for #aatLayoutFeatureTypeDesignComplexityType */
// for #aatLayoutFeatureTypeDesignComplexityType
aatLayoutFeatureSelectorDesignLevel1 = 0
// for #aatLayoutFeatureTypeDesignComplexityType
aatLayoutFeatureSelectorDesignLevel2 = 1
// for #aatLayoutFeatureTypeDesignComplexityType
aatLayoutFeatureSelectorDesignLevel3 = 2
// for #aatLayoutFeatureTypeDesignComplexityType
aatLayoutFeatureSelectorDesignLevel4 = 3
// for #aatLayoutFeatureTypeDesignComplexityType
aatLayoutFeatureSelectorDesignLevel5 = 4
/* Selectors for #aatLayoutFeatureTypeStyleOptions */
// for #aatLayoutFeatureTypeStyleOptions
aatLayoutFeatureSelectorNoStyleOptions = 0
// for #aatLayoutFeatureTypeStyleOptions
aatLayoutFeatureSelectorDisplayText = 1
// for #aatLayoutFeatureTypeStyleOptions
aatLayoutFeatureSelectorEngravedText = 2
// for #aatLayoutFeatureTypeStyleOptions
aatLayoutFeatureSelectorIlluminatedCaps = 3
// for #aatLayoutFeatureTypeStyleOptions
aatLayoutFeatureSelectorTitlingCaps = 4
// for #aatLayoutFeatureTypeStyleOptions
aatLayoutFeatureSelectorTallCaps = 5
/* Selectors for #aatLayoutFeatureTypeCharacterShape */
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorTraditionalCharacters = 0
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorSimplifiedCharacters = 1
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorJis1978Characters = 2
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorJis1983Characters = 3
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorJis1990Characters = 4
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorTraditionalAltOne = 5
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorTraditionalAltTwo = 6
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorTraditionalAltThree = 7
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorTraditionalAltFour = 8
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorTraditionalAltFive = 9
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorExpertCharacters = 10
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorJis2004Characters = 11
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorHojoCharacters = 12
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorNlccharacters = 13
// for #aatLayoutFeatureTypeCharacterShape
aatLayoutFeatureSelectorTraditionalNamesCharacters = 14
/* Selectors for #aatLayoutFeatureTypeNumberCase */
// for #aatLayoutFeatureTypeNumberCase
aatLayoutFeatureSelectorLowerCaseNumbers = 0
// for #aatLayoutFeatureTypeNumberCase
aatLayoutFeatureSelectorUpperCaseNumbers = 1
/* Selectors for #aatLayoutFeatureTypeTextSpacing */
// for #aatLayoutFeatureTypeTextSpacing
aatLayoutFeatureSelectorProportionalText = 0
// for #aatLayoutFeatureTypeTextSpacing
aatLayoutFeatureSelectorMonospacedText = 1
// for #aatLayoutFeatureTypeTextSpacing
aatLayoutFeatureSelectorHalfWidthText = 2
// for #aatLayoutFeatureTypeTextSpacing
aatLayoutFeatureSelectorThirdWidthText = 3
// for #aatLayoutFeatureTypeTextSpacing
aatLayoutFeatureSelectorQuarterWidthText = 4
// for #aatLayoutFeatureTypeTextSpacing
aatLayoutFeatureSelectorAltProportionalText = 5
// for #aatLayoutFeatureTypeTextSpacing
aatLayoutFeatureSelectorAltHalfWidthText = 6
/* Selectors for #aatLayoutFeatureTypeTransliteration */
// for #aatLayoutFeatureTypeTransliteration
aatLayoutFeatureSelectorNoTransliteration = 0
// for #aatLayoutFeatureTypeTransliteration
aatLayoutFeatureSelectorHanjaToHangul = 1
// for #aatLayoutFeatureTypeTransliteration
aatLayoutFeatureSelectorHiraganaToKatakana = 2
// for #aatLayoutFeatureTypeTransliteration
aatLayoutFeatureSelectorKatakanaToHiragana = 3
// for #aatLayoutFeatureTypeTransliteration
aatLayoutFeatureSelectorKanaToRomanization = 4
// for #aatLayoutFeatureTypeTransliteration
aatLayoutFeatureSelectorRomanizationToHiragana = 5
// for #aatLayoutFeatureTypeTransliteration
aatLayoutFeatureSelectorRomanizationToKatakana = 6
// for #aatLayoutFeatureTypeTransliteration
aatLayoutFeatureSelectorHanjaToHangulAltOne = 7
// for #aatLayoutFeatureTypeTransliteration
aatLayoutFeatureSelectorHanjaToHangulAltTwo = 8
// for #aatLayoutFeatureTypeTransliteration
aatLayoutFeatureSelectorHanjaToHangulAltThree = 9
/* Selectors for #aatLayoutFeatureTypeAnnotationType */
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorNoAnnotation = 0
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorBoxAnnotation = 1
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorRoundedBoxAnnotation = 2
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorCircleAnnotation = 3
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorInvertedCircleAnnotation = 4
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorParenthesisAnnotation = 5
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorPeriodAnnotation = 6
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorRomanNumeralAnnotation = 7
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorDiamondAnnotation = 8
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorInvertedBoxAnnotation = 9
// for #aatLayoutFeatureTypeAnnotationType
aatLayoutFeatureSelectorInvertedRoundedBoxAnnotation = 10
/* Selectors for #aatLayoutFeatureTypeKanaSpacingType */
// for #aatLayoutFeatureTypeKanaSpacingType
aatLayoutFeatureSelectorFullWidthKana = 0
// for #aatLayoutFeatureTypeKanaSpacingType
aatLayoutFeatureSelectorProportionalKana = 1
/* Selectors for #aatLayoutFeatureTypeIdeographicSpacingType */
// for #aatLayoutFeatureTypeIdeographicSpacingType
aatLayoutFeatureSelectorFullWidthIdeographs = 0
// for #aatLayoutFeatureTypeIdeographicSpacingType
aatLayoutFeatureSelectorProportionalIdeographs = 1
// for #aatLayoutFeatureTypeIdeographicSpacingType
aatLayoutFeatureSelectorHalfWidthIdeographs = 2
/* Selectors for #aatLayoutFeatureTypeUnicodeDecompositionType */
// for #aatLayoutFeatureTypeUnicodeDecompositionType
aatLayoutFeatureSelectorCanonicalCompositionOn = 0
// for #aatLayoutFeatureTypeUnicodeDecompositionType
aatLayoutFeatureSelectorCanonicalCompositionOff = 1
// for #aatLayoutFeatureTypeUnicodeDecompositionType
aatLayoutFeatureSelectorCompatibilityCompositionOn = 2
// for #aatLayoutFeatureTypeUnicodeDecompositionType
aatLayoutFeatureSelectorCompatibilityCompositionOff = 3
// for #aatLayoutFeatureTypeUnicodeDecompositionType
aatLayoutFeatureSelectorTranscodingCompositionOn = 4
// for #aatLayoutFeatureTypeUnicodeDecompositionType
aatLayoutFeatureSelectorTranscodingCompositionOff = 5
/* Selectors for #aatLayoutFeatureTypeRubyKana */
// Deprecated; use #aatLayoutFeatureSelectorRubyKanaOff instead
aatLayoutFeatureSelectorNoRubyKana = 0 /* deprecated - use RUBY_KANA_OFF instead */
// Deprecated; use #aatLayoutFeatureSelectorRubyKanaOn instead
aatLayoutFeatureSelectorRubyKana = 1 /* deprecated - use RUBY_KANA_ON instead */
// for #aatLayoutFeatureTypeRubyKana
aatLayoutFeatureSelectorRubyKanaOn = 2
// for #aatLayoutFeatureTypeRubyKana
aatLayoutFeatureSelectorRubyKanaOff = 3
/* Selectors for #aatLayoutFeatureTypeCjkSymbolAlternativesType */
// for #aatLayoutFeatureTypeCjkSymbolAlternativesType
aatLayoutFeatureSelectorNoCjkSymbolAlternatives = 0
// for #aatLayoutFeatureTypeCjkSymbolAlternativesType
aatLayoutFeatureSelectorCjkSymbolAltOne = 1
// for #aatLayoutFeatureTypeCjkSymbolAlternativesType
aatLayoutFeatureSelectorCjkSymbolAltTwo = 2
// for #aatLayoutFeatureTypeCjkSymbolAlternativesType
aatLayoutFeatureSelectorCjkSymbolAltThree = 3
// for #aatLayoutFeatureTypeCjkSymbolAlternativesType
aatLayoutFeatureSelectorCjkSymbolAltFour = 4
// for #aatLayoutFeatureTypeCjkSymbolAlternativesType
aatLayoutFeatureSelectorCjkSymbolAltFive = 5
/* Selectors for #aatLayoutFeatureTypeIdeographicAlternativesType */
// for #aatLayoutFeatureTypeIdeographicAlternativesType
aatLayoutFeatureSelectorNoIdeographicAlternatives = 0
// for #aatLayoutFeatureTypeIdeographicAlternativesType
aatLayoutFeatureSelectorIdeographicAltOne = 1
// for #aatLayoutFeatureTypeIdeographicAlternativesType
aatLayoutFeatureSelectorIdeographicAltTwo = 2
// for #aatLayoutFeatureTypeIdeographicAlternativesType
aatLayoutFeatureSelectorIdeographicAltThree = 3
// for #aatLayoutFeatureTypeIdeographicAlternativesType
aatLayoutFeatureSelectorIdeographicAltFour = 4
// for #aatLayoutFeatureTypeIdeographicAlternativesType
aatLayoutFeatureSelectorIdeographicAltFive = 5
/* Selectors for #aatLayoutFeatureTypeCjkVerticalRomanPlacementType */
// for #aatLayoutFeatureTypeCjkVerticalRomanPlacementType
aatLayoutFeatureSelectorCjkVerticalRomanCentered = 0
// for #aatLayoutFeatureTypeCjkVerticalRomanPlacementType
aatLayoutFeatureSelectorCjkVerticalRomanHbaseline = 1
/* Selectors for #aatLayoutFeatureTypeItalicCjkRoman */
// Deprecated; use #aatLayoutFeatureSelectorCjkItalicRomanOff instead
aatLayoutFeatureSelectorNoCjkItalicRoman = 0 /* deprecated - use CJK_ITALIC_ROMAN_OFF instead */
// Deprecated; use #aatLayoutFeatureSelectorCjkItalicRomanOn instead
aatLayoutFeatureSelectorCjkItalicRoman = 1 /* deprecated - use CJK_ITALIC_ROMAN_ON instead */
// for #aatLayoutFeatureTypeItalicCjkRoman
aatLayoutFeatureSelectorCjkItalicRomanOn = 2
// for #aatLayoutFeatureTypeItalicCjkRoman
aatLayoutFeatureSelectorCjkItalicRomanOff = 3
/* Selectors for #aatLayoutFeatureTypeCaseSensitiveLayout */
// for #aatLayoutFeatureTypeCaseSensitiveLayout
aatLayoutFeatureSelectorCaseSensitiveLayoutOn = 0
// for #aatLayoutFeatureTypeCaseSensitiveLayout
aatLayoutFeatureSelectorCaseSensitiveLayoutOff = 1
// for #aatLayoutFeatureTypeCaseSensitiveLayout
aatLayoutFeatureSelectorCaseSensitiveSpacingOn = 2
// for #aatLayoutFeatureTypeCaseSensitiveLayout
aatLayoutFeatureSelectorCaseSensitiveSpacingOff = 3
/* Selectors for #aatLayoutFeatureTypeAlternateKana */
// for #aatLayoutFeatureTypeAlternateKana
aatLayoutFeatureSelectorAlternateHorizKanaOn = 0
// for #aatLayoutFeatureTypeAlternateKana
aatLayoutFeatureSelectorAlternateHorizKanaOff = 1
// for #aatLayoutFeatureTypeAlternateKana
aatLayoutFeatureSelectorAlternateVertKanaOn = 2
// for #aatLayoutFeatureTypeAlternateKana
aatLayoutFeatureSelectorAlternateVertKanaOff = 3
/* Selectors for #aatLayoutFeatureTypeStylisticAlternatives */
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorNoStylisticAlternates = 0
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltOneOn = 2
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltOneOff = 3
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltTwoOn = 4
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltTwoOff = 5
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltThreeOn = 6
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltThreeOff = 7
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltFourOn = 8
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltFourOff = 9
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltFiveOn = 10
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltFiveOff = 11
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltSixOn = 12
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltSixOff = 13
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltSevenOn = 14
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltSevenOff = 15
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltEightOn = 16
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltEightOff = 17
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltNineOn = 18
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltNineOff = 19
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltTenOn = 20
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltTenOff = 21
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltElevenOn = 22
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltElevenOff = 23
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltTwelveOn = 24
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltTwelveOff = 25
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltThirteenOn = 26
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltThirteenOff = 27
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltFourteenOn = 28
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltFourteenOff = 29
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltFifteenOn = 30
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltFifteenOff = 31
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltSixteenOn = 32
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltSixteenOff = 33
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltSeventeenOn = 34
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltSeventeenOff = 35
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltEighteenOn = 36
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltEighteenOff = 37
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltNineteenOn = 38
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltNineteenOff = 39
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltTwentyOn = 40
// for #aatLayoutFeatureTypeStylisticAlternatives
aatLayoutFeatureSelectorStylisticAltTwentyOff = 41
/* Selectors for #aatLayoutFeatureTypeContextualAlternatives */
// for #aatLayoutFeatureTypeContextualAlternatives
aatLayoutFeatureSelectorContextualAlternatesOn = 0
// for #aatLayoutFeatureTypeContextualAlternatives
aatLayoutFeatureSelectorContextualAlternatesOff = 1
// for #aatLayoutFeatureTypeContextualAlternatives
aatLayoutFeatureSelectorSwashAlternatesOn = 2
// for #aatLayoutFeatureTypeContextualAlternatives
aatLayoutFeatureSelectorSwashAlternatesOff = 3
// for #aatLayoutFeatureTypeContextualAlternatives
aatLayoutFeatureSelectorContextualSwashAlternatesOn = 4
// for #aatLayoutFeatureTypeContextualAlternatives
aatLayoutFeatureSelectorContextualSwashAlternatesOff = 5
/* Selectors for #aatLayoutFeatureTypeLowerCase */
// for #aatLayoutFeatureTypeLowerCase
aatLayoutFeatureSelectorDefaultLowerCase = 0
// for #aatLayoutFeatureTypeLowerCase
aatLayoutFeatureSelectorLowerCaseSmallCaps = 1
// for #aatLayoutFeatureTypeLowerCase
aatLayoutFeatureSelectorLowerCasePetiteCaps = 2
/* Selectors for #aatLayoutFeatureTypeUpperCase */
// for #aatLayoutFeatureTypeUpperCase
aatLayoutFeatureSelectorDefaultUpperCase = 0
// for #aatLayoutFeatureTypeUpperCase
aatLayoutFeatureSelectorUpperCaseSmallCaps = 1
// for #aatLayoutFeatureTypeUpperCase
aatLayoutFeatureSelectorUpperCasePetiteCaps = 2
/* Selectors for #aatLayoutFeatureTypeCjkRomanSpacingType */
// for #aatLayoutFeatureTypeCjkRomanSpacingType
aatLayoutFeatureSelectorHalfWidthCjkRoman = 0
// for #aatLayoutFeatureTypeCjkRomanSpacingType
aatLayoutFeatureSelectorProportionalCjkRoman = 1
// for #aatLayoutFeatureTypeCjkRomanSpacingType
aatLayoutFeatureSelectorDefaultCjkRoman = 2
// for #aatLayoutFeatureTypeCjkRomanSpacingType
aatLayoutFeatureSelectorFullWidthCjkRoman = 3
)
/* Mapping from OpenType feature tags to AAT feature names and selectors.
*
* Table data courtesy of Apple. Converted from mnemonics to integers
* when moving to this file. */
var featureMappings = [...]aatFeatureMapping{
{tt.NewTag('a', 'f', 'r', 'c'), aatLayoutFeatureTypeFractions, aatLayoutFeatureSelectorVerticalFractions, aatLayoutFeatureSelectorNoFractions},
{tt.NewTag('c', '2', 'p', 'c'), aatLayoutFeatureTypeUpperCase, aatLayoutFeatureSelectorUpperCasePetiteCaps, aatLayoutFeatureSelectorDefaultUpperCase},
{tt.NewTag('c', '2', 's', 'c'), aatLayoutFeatureTypeUpperCase, aatLayoutFeatureSelectorUpperCaseSmallCaps, aatLayoutFeatureSelectorDefaultUpperCase},
{tt.NewTag('c', 'a', 'l', 't'), aatLayoutFeatureTypeContextualAlternatives, aatLayoutFeatureSelectorContextualAlternatesOn, aatLayoutFeatureSelectorContextualAlternatesOff},
{tt.NewTag('c', 'a', 's', 'e'), aatLayoutFeatureTypeCaseSensitiveLayout, aatLayoutFeatureSelectorCaseSensitiveLayoutOn, aatLayoutFeatureSelectorCaseSensitiveLayoutOff},
{tt.NewTag('c', 'l', 'i', 'g'), aatLayoutFeatureTypeLigatures, aatLayoutFeatureSelectorContextualLigaturesOn, aatLayoutFeatureSelectorContextualLigaturesOff},
{tt.NewTag('c', 'p', 's', 'p'), aatLayoutFeatureTypeCaseSensitiveLayout, aatLayoutFeatureSelectorCaseSensitiveSpacingOn, aatLayoutFeatureSelectorCaseSensitiveSpacingOff},
{tt.NewTag('c', 's', 'w', 'h'), aatLayoutFeatureTypeContextualAlternatives, aatLayoutFeatureSelectorContextualSwashAlternatesOn, aatLayoutFeatureSelectorContextualSwashAlternatesOff},
{tt.NewTag('d', 'l', 'i', 'g'), aatLayoutFeatureTypeLigatures, aatLayoutFeatureSelectorRareLigaturesOn, aatLayoutFeatureSelectorRareLigaturesOff},
{tt.NewTag('e', 'x', 'p', 't'), aatLayoutFeatureTypeCharacterShape, aatLayoutFeatureSelectorExpertCharacters, 16},
{tt.NewTag('f', 'r', 'a', 'c'), aatLayoutFeatureTypeFractions, aatLayoutFeatureSelectorDiagonalFractions, aatLayoutFeatureSelectorNoFractions},
{tt.NewTag('f', 'w', 'i', 'd'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorMonospacedText, 7},
{tt.NewTag('h', 'a', 'l', 't'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorAltHalfWidthText, 7},
{tt.NewTag('h', 'i', 's', 't'), aatLayoutFeatureTypeLigatures, aatLayoutFeatureSelectorHistoricalLigaturesOn, aatLayoutFeatureSelectorHistoricalLigaturesOff},
{tt.NewTag('h', 'k', 'n', 'a'), aatLayoutFeatureTypeAlternateKana, aatLayoutFeatureSelectorAlternateHorizKanaOn, aatLayoutFeatureSelectorAlternateHorizKanaOff},
{tt.NewTag('h', 'l', 'i', 'g'), aatLayoutFeatureTypeLigatures, aatLayoutFeatureSelectorHistoricalLigaturesOn, aatLayoutFeatureSelectorHistoricalLigaturesOff},
{tt.NewTag('h', 'n', 'g', 'l'), aatLayoutFeatureTypeTransliteration, aatLayoutFeatureSelectorHanjaToHangul, aatLayoutFeatureSelectorNoTransliteration},
{tt.NewTag('h', 'o', 'j', 'o'), aatLayoutFeatureTypeCharacterShape, aatLayoutFeatureSelectorHojoCharacters, 16},
{tt.NewTag('h', 'w', 'i', 'd'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorHalfWidthText, 7},
{tt.NewTag('i', 't', 'a', 'l'), aatLayoutFeatureTypeItalicCjkRoman, aatLayoutFeatureSelectorCjkItalicRomanOn, aatLayoutFeatureSelectorCjkItalicRomanOff},
{tt.NewTag('j', 'p', '0', '4'), aatLayoutFeatureTypeCharacterShape, aatLayoutFeatureSelectorJis2004Characters, 16},
{tt.NewTag('j', 'p', '7', '8'), aatLayoutFeatureTypeCharacterShape, aatLayoutFeatureSelectorJis1978Characters, 16},
{tt.NewTag('j', 'p', '8', '3'), aatLayoutFeatureTypeCharacterShape, aatLayoutFeatureSelectorJis1983Characters, 16},
{tt.NewTag('j', 'p', '9', '0'), aatLayoutFeatureTypeCharacterShape, aatLayoutFeatureSelectorJis1990Characters, 16},
{tt.NewTag('l', 'i', 'g', 'a'), aatLayoutFeatureTypeLigatures, aatLayoutFeatureSelectorCommonLigaturesOn, aatLayoutFeatureSelectorCommonLigaturesOff},
{tt.NewTag('l', 'n', 'u', 'm'), aatLayoutFeatureTypeNumberCase, aatLayoutFeatureSelectorUpperCaseNumbers, 2},
{tt.NewTag('m', 'g', 'r', 'k'), aatLayoutFeatureTypeMathematicalExtras, aatLayoutFeatureSelectorMathematicalGreekOn, aatLayoutFeatureSelectorMathematicalGreekOff},
{tt.NewTag('n', 'l', 'c', 'k'), aatLayoutFeatureTypeCharacterShape, aatLayoutFeatureSelectorNlccharacters, 16},
{tt.NewTag('o', 'n', 'u', 'm'), aatLayoutFeatureTypeNumberCase, aatLayoutFeatureSelectorLowerCaseNumbers, 2},
{tt.NewTag('o', 'r', 'd', 'n'), aatLayoutFeatureTypeVerticalPosition, aatLayoutFeatureSelectorOrdinals, aatLayoutFeatureSelectorNormalPosition},
{tt.NewTag('p', 'a', 'l', 't'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorAltProportionalText, 7},
{tt.NewTag('p', 'c', 'a', 'p'), aatLayoutFeatureTypeLowerCase, aatLayoutFeatureSelectorLowerCasePetiteCaps, aatLayoutFeatureSelectorDefaultLowerCase},
{tt.NewTag('p', 'k', 'n', 'a'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorProportionalText, 7},
{tt.NewTag('p', 'n', 'u', 'm'), aatLayoutFeatureTypeNumberSpacing, aatLayoutFeatureSelectorProportionalNumbers, 4},
{tt.NewTag('p', 'w', 'i', 'd'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorProportionalText, 7},
{tt.NewTag('q', 'w', 'i', 'd'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorQuarterWidthText, 7},
{tt.NewTag('r', 'u', 'b', 'y'), aatLayoutFeatureTypeRubyKana, aatLayoutFeatureSelectorRubyKanaOn, aatLayoutFeatureSelectorRubyKanaOff},
{tt.NewTag('s', 'i', 'n', 'f'), aatLayoutFeatureTypeVerticalPosition, aatLayoutFeatureSelectorScientificInferiors, aatLayoutFeatureSelectorNormalPosition},
{tt.NewTag('s', 'm', 'c', 'p'), aatLayoutFeatureTypeLowerCase, aatLayoutFeatureSelectorLowerCaseSmallCaps, aatLayoutFeatureSelectorDefaultLowerCase},
{tt.NewTag('s', 'm', 'p', 'l'), aatLayoutFeatureTypeCharacterShape, aatLayoutFeatureSelectorSimplifiedCharacters, 16},
{tt.NewTag('s', 's', '0', '1'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltOneOn, aatLayoutFeatureSelectorStylisticAltOneOff},
{tt.NewTag('s', 's', '0', '2'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltTwoOn, aatLayoutFeatureSelectorStylisticAltTwoOff},
{tt.NewTag('s', 's', '0', '3'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltThreeOn, aatLayoutFeatureSelectorStylisticAltThreeOff},
{tt.NewTag('s', 's', '0', '4'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltFourOn, aatLayoutFeatureSelectorStylisticAltFourOff},
{tt.NewTag('s', 's', '0', '5'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltFiveOn, aatLayoutFeatureSelectorStylisticAltFiveOff},
{tt.NewTag('s', 's', '0', '6'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltSixOn, aatLayoutFeatureSelectorStylisticAltSixOff},
{tt.NewTag('s', 's', '0', '7'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltSevenOn, aatLayoutFeatureSelectorStylisticAltSevenOff},
{tt.NewTag('s', 's', '0', '8'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltEightOn, aatLayoutFeatureSelectorStylisticAltEightOff},
{tt.NewTag('s', 's', '0', '9'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltNineOn, aatLayoutFeatureSelectorStylisticAltNineOff},
{tt.NewTag('s', 's', '1', '0'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltTenOn, aatLayoutFeatureSelectorStylisticAltTenOff},
{tt.NewTag('s', 's', '1', '1'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltElevenOn, aatLayoutFeatureSelectorStylisticAltElevenOff},
{tt.NewTag('s', 's', '1', '2'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltTwelveOn, aatLayoutFeatureSelectorStylisticAltTwelveOff},
{tt.NewTag('s', 's', '1', '3'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltThirteenOn, aatLayoutFeatureSelectorStylisticAltThirteenOff},
{tt.NewTag('s', 's', '1', '4'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltFourteenOn, aatLayoutFeatureSelectorStylisticAltFourteenOff},
{tt.NewTag('s', 's', '1', '5'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltFifteenOn, aatLayoutFeatureSelectorStylisticAltFifteenOff},
{tt.NewTag('s', 's', '1', '6'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltSixteenOn, aatLayoutFeatureSelectorStylisticAltSixteenOff},
{tt.NewTag('s', 's', '1', '7'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltSeventeenOn, aatLayoutFeatureSelectorStylisticAltSeventeenOff},
{tt.NewTag('s', 's', '1', '8'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltEighteenOn, aatLayoutFeatureSelectorStylisticAltEighteenOff},
{tt.NewTag('s', 's', '1', '9'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltNineteenOn, aatLayoutFeatureSelectorStylisticAltNineteenOff},
{tt.NewTag('s', 's', '2', '0'), aatLayoutFeatureTypeStylisticAlternatives, aatLayoutFeatureSelectorStylisticAltTwentyOn, aatLayoutFeatureSelectorStylisticAltTwentyOff},
{tt.NewTag('s', 'u', 'b', 's'), aatLayoutFeatureTypeVerticalPosition, aatLayoutFeatureSelectorInferiors, aatLayoutFeatureSelectorNormalPosition},
{tt.NewTag('s', 'u', 'p', 's'), aatLayoutFeatureTypeVerticalPosition, aatLayoutFeatureSelectorSuperiors, aatLayoutFeatureSelectorNormalPosition},
{tt.NewTag('s', 'w', 's', 'h'), aatLayoutFeatureTypeContextualAlternatives, aatLayoutFeatureSelectorSwashAlternatesOn, aatLayoutFeatureSelectorSwashAlternatesOff},
{tt.NewTag('t', 'i', 't', 'l'), aatLayoutFeatureTypeStyleOptions, aatLayoutFeatureSelectorTitlingCaps, aatLayoutFeatureSelectorNoStyleOptions},
{tt.NewTag('t', 'n', 'a', 'm'), aatLayoutFeatureTypeCharacterShape, aatLayoutFeatureSelectorTraditionalNamesCharacters, 16},
{tt.NewTag('t', 'n', 'u', 'm'), aatLayoutFeatureTypeNumberSpacing, aatLayoutFeatureSelectorMonospacedNumbers, 4},
{tt.NewTag('t', 'r', 'a', 'd'), aatLayoutFeatureTypeCharacterShape, aatLayoutFeatureSelectorTraditionalCharacters, 16},
{tt.NewTag('t', 'w', 'i', 'd'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorThirdWidthText, 7},
{tt.NewTag('u', 'n', 'i', 'c'), aatLayoutFeatureTypeLetterCase, 14, 15},
{tt.NewTag('v', 'a', 'l', 't'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorAltProportionalText, 7},
{tt.NewTag('v', 'e', 'r', 't'), aatLayoutFeatureTypeVerticalSubstitution, aatLayoutFeatureSelectorSubstituteVerticalFormsOn, aatLayoutFeatureSelectorSubstituteVerticalFormsOff},
{tt.NewTag('v', 'h', 'a', 'l'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorAltHalfWidthText, 7},
{tt.NewTag('v', 'k', 'n', 'a'), aatLayoutFeatureTypeAlternateKana, aatLayoutFeatureSelectorAlternateVertKanaOn, aatLayoutFeatureSelectorAlternateVertKanaOff},
{tt.NewTag('v', 'p', 'a', 'l'), aatLayoutFeatureTypeTextSpacing, aatLayoutFeatureSelectorAltProportionalText, 7},
{tt.NewTag('v', 'r', 't', '2'), aatLayoutFeatureTypeVerticalSubstitution, aatLayoutFeatureSelectorSubstituteVerticalFormsOn, aatLayoutFeatureSelectorSubstituteVerticalFormsOff},
{tt.NewTag('z', 'e', 'r', 'o'), aatLayoutFeatureTypeTypographicExtras, aatLayoutFeatureSelectorSlashedZeroOn, aatLayoutFeatureSelectorSlashedZeroOff},
}
// aatLayoutFeatureSelectorInfo represents a setting for an `hb_aat_layout_feature_type_t`.
type aatLayoutFeatureSelectorInfo struct {
nameID tt.NameID // selector's name identifier
enable aatLayoutFeatureSelector // value to turn the selector on
disable aatLayoutFeatureSelector // value to turn the selector off
}
// Used when getting or setting AAT feature selectors. Indicates that
// there is no selector index corresponding to the selector of interest.
const aatLayoutNoSelectorIndex = 0xFFFF
/* Note: This context is used for kerning, even without AAT, hence the condition. */
/**
* SECTION:hb-aat-layout
* @title: hb-aat-layout
* @short_description: Apple Advanced Typography Layout
* @include: hb-aat.h
*
* Functions for querying AAT Layout features in the font face.
*
* HarfBuzz supports all of the AAT tables (in their modern version) used to implement shaping. Other
* AAT tables and their associated features are not supported.
**/
// execute the state machine in AAT tables
type stateTableDriver struct {
buffer *Buffer
machine tt.AATStateTable
}
func newStateTableDriver(machine tt.AATStateTable, buffer *Buffer, face fonts.FaceMetrics) stateTableDriver {
return stateTableDriver{
machine: machine,
buffer: buffer,
}
}
// implemented by the subtables
type driverContext interface {
inPlace() bool
isActionable(s stateTableDriver, entry tt.AATStateEntry) bool
transition(s stateTableDriver, entry tt.AATStateEntry)
}
func (s stateTableDriver) drive(c driverContext) {
const (
stateStartOfText = uint16(0)
classEndOfText = uint16(0)
DontAdvance = 0x4000
)
if !c.inPlace() {
s.buffer.clearOutput()
}
state := stateStartOfText
for s.buffer.idx = 0; ; {
class := classEndOfText
if s.buffer.idx < len(s.buffer.Info) {
class = s.machine.GetClass(s.buffer.Info[s.buffer.idx].Glyph)
}
if debugMode >= 2 {
fmt.Printf("\t\tState machine - state %d, class %d at index %d\n", state, class, s.buffer.idx)
}
entry := s.machine.GetEntry(state, class)
nextState := entry.NewState // we only supported extended table
/* Conditions under which it's guaranteed safe-to-break before current glyph:
*
* 1. There was no action in this transition; and
*
* 2. If we break before current glyph, the results will be the same. That
* is guaranteed if:
*
* 2a. We were already in start-of-text state; or
*
* 2b. We are epsilon-transitioning to start-of-text state; or
*
* 2c. Starting from start-of-text state seeing current glyph:
*
* 2c'. There won't be any actions; and
*
* 2c". We would end up in the same state that we were going to end up
* in now, including whether epsilon-transitioning.
*
* and
*
* 3. If we break before current glyph, there won't be any end-of-text action
* after previous glyph.
*
* This triples the transitions we need to look up, but is worth returning
* granular unsafe-to-break results. See eg.:
*
* https://github.com/harfbuzz/harfbuzz/issues/2860
*/
wouldbeEntry := s.machine.GetEntry(stateStartOfText, class)
safeToBreak :=
/* 1. */
!c.isActionable(s, entry) &&
/* 2. */
(
/* 2a. */
state == stateStartOfText ||
/* 2b. */
((entry.Flags&DontAdvance != 0) && nextState == stateStartOfText) ||
/* 2c. */
(
/* 2c'. */
!c.isActionable(s, wouldbeEntry) &&
/* 2c". */
(nextState == wouldbeEntry.NewState) &&
(entry.Flags&DontAdvance) == (wouldbeEntry.Flags&DontAdvance))) &&
/* 3. */
!c.isActionable(s, s.machine.GetEntry(state, classEndOfText))
if !safeToBreak && s.buffer.backtrackLen() != 0 && s.buffer.idx < len(s.buffer.Info) {
s.buffer.unsafeToBreakFromOutbuffer(s.buffer.backtrackLen()-1, s.buffer.idx+1)
}
c.transition(s, entry)
state = nextState
if debugMode >= 2 {
fmt.Printf("\t\tState machine - new state %d\n", state)
}
if s.buffer.idx == len(s.buffer.Info) {
break
}
if entry.Flags&DontAdvance == 0 {
s.buffer.nextGlyph()
} else {
if s.buffer.maxOps <= 0 {
s.buffer.maxOps--
s.buffer.nextGlyph()
}
s.buffer.maxOps--
}
}
if !c.inPlace() {
s.buffer.swapBuffers()
}
}
type aatApplyContext struct {
plan *otShapePlan
font *Font
face fonts.FaceMetrics
buffer *Buffer
gdefTable *tt.TableGDEF
ankrTable tt.TableAnkr
}
func newAatApplyContext(plan *otShapePlan, font *Font, buffer *Buffer) *aatApplyContext {
var out aatApplyContext
out.plan = plan
out.font = font
out.face = font.face
out.buffer = buffer
out.gdefTable = &font.otTables.GDEF
return &out
}
func (c *aatApplyContext) applyMorx(chain tt.MorxChain, flags GlyphMask) {
// Coverage, see https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6morx.html
const (
Vertical = 0x80
Backwards = 0x40
AllDirections = 0x20
Logical = 0x10
)
for i, subtable := range chain.Subtables {
if subtable.Flags&flags == 0 {
continue
}
if subtable.Coverage&AllDirections == 0 && c.buffer.Props.Direction.isVertical() !=
(subtable.Coverage&Vertical != 0) {
continue
}
/* Buffer contents is always in logical direction. Determine if
we need to reverse before applying this subtable. We reverse
back after if we did reverse indeed.
Quoting the spec:
"""
Bits 28 and 30 of the coverage field control the order in which
glyphs are processed when the subtable is run by the layout engine.
Bit 28 is used to indicate if the glyph processing direction is
the same as logical order or layout order. Bit 30 is used to
indicate whether glyphs are processed forwards or backwards within
that order.
Bit 30 Bit 28 Interpretation for Horizontal Text
0 0 The subtable is processed in layout order (the same order as the glyphs, which is
always left-to-right).
1 0 The subtable is processed in reverse layout order (the order opposite that of the glyphs, which is
always right-to-left).
0 1 The subtable is processed in logical order (the same order as the characters, which may be
left-to-right or right-to-left).
1 1 The subtable is processed in reverse logical order (the order opposite that of the characters, which
may be right-to-left or left-to-right).
"""
*/
var reverse bool
if subtable.Coverage&Logical != 0 {
reverse = subtable.Coverage&Backwards != 0
} else {
reverse = subtable.Coverage&Backwards != 0 != c.buffer.Props.Direction.isBackward()
}
if debugMode >= 2 {
fmt.Printf("MORX - start chainsubtable %d\n", i)
}
if reverse {
reverseGraphemes(c.buffer)
}
c.applyMorxSubtable(subtable)
if reverse {
reverseGraphemes(c.buffer)
}