/
ot_aat_layout.go
1477 lines (1280 loc) · 55.2 KB
/
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
// [Ruby Kana](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html#Type28)
aatLayoutFeatureTypeRubyKana = 28
// [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
)
// The selectors defined for specifying AAT feature settings.
type aatLayoutFeatureSelector = uint16
const (
/* Selectors for #aatLayoutFeatureTypeLigatures */
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorCommonLigaturesOn = 2
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorCommonLigaturesOff = 3
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorRareLigaturesOn = 4
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorRareLigaturesOff = 5
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorContextualLigaturesOn = 18
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorContextualLigaturesOff = 19
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorHistoricalLigaturesOn = 20
// for #aatLayoutFeatureTypeLigatures
aatLayoutFeatureSelectorHistoricalLigaturesOff = 21
/* Selectors for #aatLayoutFeatureTypeLetterCase */
// Deprecated
aatLayoutFeatureSelectorSmallCaps = 3 /* deprecated */
/* Selectors for #aatLayoutFeatureTypeVerticalSubstitution */
// for #aatLayoutFeatureTypeVerticalSubstitution
aatLayoutFeatureSelectorSubstituteVerticalFormsOn = 0
// for #aatLayoutFeatureTypeVerticalSubstitution
aatLayoutFeatureSelectorSubstituteVerticalFormsOff = 1
/* Selectors for #aatLayoutFeatureTypeNumberSpacing */
// for #aatLayoutFeatureTypeNumberSpacing
aatLayoutFeatureSelectorMonospacedNumbers = 0
// for #aatLayoutFeatureTypeNumberSpacing
aatLayoutFeatureSelectorProportionalNumbers = 1
/* 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
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorSlashedZeroOn = 4
// for #aatLayoutFeatureTypeTypographicExtras
aatLayoutFeatureSelectorSlashedZeroOff = 5
/* Selectors for #aatLayoutFeatureTypeMathematicalExtras */
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorMathematicalGreekOn = 10
// for #aatLayoutFeatureTypeMathematicalExtras
aatLayoutFeatureSelectorMathematicalGreekOff = 11
/* Selectors for #aatLayoutFeatureTypeStyleOptions */
// for #aatLayoutFeatureTypeStyleOptions
aatLayoutFeatureSelectorNoStyleOptions = 0
// for #aatLayoutFeatureTypeStyleOptions
aatLayoutFeatureSelectorTitlingCaps = 4
/* 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
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
/* Selectors for #aatLayoutFeatureTypeRubyKana */
// for #aatLayoutFeatureTypeRubyKana
aatLayoutFeatureSelectorRubyKanaOn = 2
// for #aatLayoutFeatureTypeRubyKana
aatLayoutFeatureSelectorRubyKanaOff = 3
/* Selectors for #aatLayoutFeatureTypeItalicCjkRoman */
// 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
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
)
/* 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},
}
// 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)
}
if debugMode >= 2 {
fmt.Printf("MORX - end chainsubtable %d\n", i)
fmt.Println(c.buffer.Info)
}
}
}
func (c *aatApplyContext) applyMorxSubtable(subtable tt.MortxSubtable) bool {
if debugMode >= 2 {
fmt.Printf("\tMORX subtable %T\n", subtable.Data)
}
switch data := subtable.Data.(type) {
case tt.MorxRearrangementSubtable:
var dc driverContextRearrangement
driver := newStateTableDriver(tt.AATStateTable(data), c.buffer, c.face)
driver.drive(&dc)
case tt.MorxContextualSubtable:
dc := driverContextContextual{table: data, gdef: c.gdefTable, hasGlyphClass: c.gdefTable.Class != nil}
driver := newStateTableDriver(data.Machine, c.buffer, c.face)
driver.drive(&dc)
return dc.ret
case tt.MorxLigatureSubtable:
dc := driverContextLigature{table: data}
driver := newStateTableDriver(data.Machine, c.buffer, c.face)
driver.drive(&dc)
case tt.MorxInsertionSubtable:
dc := driverContextInsertion{insertionAction: data.Insertions}
driver := newStateTableDriver(data.Machine, c.buffer, c.face)
driver.drive(&dc)
case tt.MorxNonContextualSubtable:
var ret bool
gdef := c.gdefTable
hasGlyphClass := gdef.Class != nil
info := c.buffer.Info
for i := range c.buffer.Info {
replacement, has := data.ClassID(info[i].Glyph)
if has {
info[i].Glyph = fonts.GID(replacement)
if hasGlyphClass {
info[i].glyphProps = gdef.GetGlyphProps(fonts.GID(replacement))
}
ret = true
}
}
return ret
}
return false
}
type driverContextRearrangement struct {
start int
end int
}
func (driverContextRearrangement) inPlace() bool { return true }
func (d driverContextRearrangement) isActionable(_ stateTableDriver, entry tt.AATStateEntry) bool {
return (entry.Flags&tt.MRVerb) != 0 && d.start < d.end
}
/* The following map has two nibbles, for start-side
* and end-side. Values of 0,1,2 mean move that many
* to the other side. Value of 3 means move 2 and
* flip them. */
var mapRearrangement = [16]int{
0x00, /* 0 no change */
0x10, /* 1 Ax => xA */
0x01, /* 2 xD => Dx */
0x11, /* 3 AxD => DxA */
0x20, /* 4 ABx => xAB */
0x30, /* 5 ABx => xBA */
0x02, /* 6 xCD => CDx */
0x03, /* 7 xCD => DCx */
0x12, /* 8 AxCD => CDxA */
0x13, /* 9 AxCD => DCxA */
0x21, /* 10 ABxD => DxAB */
0x31, /* 11 ABxD => DxBA */
0x22, /* 12 ABxCD => CDxAB */
0x32, /* 13 ABxCD => CDxBA */
0x23, /* 14 ABxCD => DCxAB */
0x33, /* 15 ABxCD => DCxBA */
}
func (d *driverContextRearrangement) transition(driver stateTableDriver, entry tt.AATStateEntry) {
buffer := driver.buffer
flags := entry.Flags
if flags&tt.MRMarkFirst != 0 {
d.start = buffer.idx
}
if flags&tt.MRMarkLast != 0 {
d.end = min(buffer.idx+1, len(buffer.Info))
}
if (flags&tt.MRVerb) != 0 && d.start < d.end {
m := mapRearrangement[flags&tt.MRVerb]
l := min(2, m>>4)
r := min(2, m&0x0F)
reverseL := m>>4 == 3
reverseR := m&0x0F == 3
if d.end-d.start >= l+r {
buffer.mergeClusters(d.start, min(buffer.idx+1, len(buffer.Info)))
buffer.mergeClusters(d.start, d.end)
info := buffer.Info
var buf [4]GlyphInfo
copy(buf[:], info[d.start:d.start+l])
copy(buf[2:], info[d.end-r:d.end])
if l != r {
copy(info[d.start+r:], info[d.start+l:d.end-r])
}
copy(info[d.start:d.start+r], buf[2:])
copy(info[d.end-l:d.end], buf[:])
if reverseL {
buf[0] = info[d.end-1]
info[d.end-1] = info[d.end-2]
info[d.end-2] = buf[0]
}
if reverseR {
buf[0] = info[d.start]
info[d.start] = info[d.start+1]
info[d.start+1] = buf[0]
}
}
}
}
type driverContextContextual struct {
gdef *tt.TableGDEF
table tt.MorxContextualSubtable
mark int
markSet bool
ret bool
hasGlyphClass bool // cached version from gdef
}
func (driverContextContextual) inPlace() bool { return true }
func (dc driverContextContextual) isActionable(driver stateTableDriver, entry tt.AATStateEntry) bool {
buffer := driver.buffer
if buffer.idx == len(buffer.Info) && !dc.markSet {
return false
}
markIndex, currentIndex := entry.AsMorxContextual()
return markIndex != 0xFFFF || currentIndex != 0xFFFF
}
func (dc *driverContextContextual) transition(driver stateTableDriver, entry tt.AATStateEntry) {
buffer := driver.buffer
/* Looks like CoreText applies neither mark nor current substitution for
* end-of-text if mark was not explicitly set. */
if buffer.idx == len(buffer.Info) && !dc.markSet {
return
}
var (
replacement uint32 // intepreted as GlyphIndex
hasRep bool
markIndex, currentIndex = entry.AsMorxContextual()
)
if markIndex != 0xFFFF {
lookup := dc.table.Substitutions[markIndex]
replacement, hasRep = lookup.ClassID(buffer.Info[dc.mark].Glyph)
}
if hasRep {
buffer.unsafeToBreak(dc.mark, min(buffer.idx+1, len(buffer.Info)))
buffer.Info[dc.mark].Glyph = fonts.GID(replacement)
if dc.hasGlyphClass {
buffer.Info[dc.mark].glyphProps = dc.gdef.GetGlyphProps(fonts.GID(replacement))
}
dc.ret = true
}
hasRep = false
idx := min(buffer.idx, len(buffer.Info)-1)
if currentIndex != 0xFFFF {
lookup := dc.table.Substitutions[currentIndex]
replacement, hasRep = lookup.ClassID(buffer.Info[idx].Glyph)
}
if hasRep {
buffer.Info[idx].Glyph = fonts.GID(replacement)
if dc.hasGlyphClass {
buffer.Info[idx].glyphProps = dc.gdef.GetGlyphProps(fonts.GID(replacement))
}
dc.ret = true
}
if entry.Flags&tt.MCSetMark != 0 {
dc.markSet = true
dc.mark = buffer.idx
}
}
type driverContextLigature struct {
table tt.MorxLigatureSubtable
matchLength int
matchPositions [maxContextLength]int
}
func (driverContextLigature) inPlace() bool { return false }
func (driverContextLigature) isActionable(_ stateTableDriver, entry tt.AATStateEntry) bool {
return entry.Flags&tt.MLOffset != 0
}
func (dc *driverContextLigature) transition(driver stateTableDriver, entry tt.AATStateEntry) {
buffer := driver.buffer
if debugMode >= 2 {
fmt.Printf("\tLigature - Ligature transition at %d\n", buffer.idx)
}
if entry.Flags&tt.MLSetComponent != 0 {
/* Never mark same index twice, in case DontAdvance was used... */
if dc.matchLength != 0 && dc.matchPositions[(dc.matchLength-1)%len(dc.matchPositions)] == len(buffer.outInfo) {
dc.matchLength--
}
dc.matchPositions[dc.matchLength%len(dc.matchPositions)] = len(buffer.outInfo)
dc.matchLength++
if debugMode >= 2 {
fmt.Printf("\tLigature - Set component at %d\n", len(buffer.outInfo))
}
}
if dc.isActionable(driver, entry) {
if debugMode >= 2 {
fmt.Printf("\tLigature - Perform action with %d\n", dc.matchLength)
}
end := len(buffer.outInfo)
if dc.matchLength == 0 {
return
}
if buffer.idx >= len(buffer.Info) {
return
}
cursor := dc.matchLength
actionIdx := entry.AsMorxLigature()
actionData := dc.table.LigatureAction[actionIdx:]
ligatureIdx := 0
var action uint32
for do := true; do; do = action&tt.MLActionLast == 0 {
if cursor == 0 {
/* Stack underflow. Clear the stack. */
if debugMode >= 2 {
fmt.Println("\tLigature - Stack underflow")
}
dc.matchLength = 0
break
}
if debugMode >= 2 {
fmt.Printf("\tLigature - Moving to stack position %d\n", cursor-1)
}
cursor--
buffer.moveTo(dc.matchPositions[cursor%len(dc.matchPositions)])
if len(actionData) == 0 {
break
}
action = actionData[0]
uoffset := action & tt.MLActionOffset
if uoffset&0x20000000 != 0 {
uoffset |= 0xC0000000 /* Sign-extend. */
}
offset := int32(uoffset)
componentIdx := int32(buffer.cur(0).Glyph) + offset
if int(componentIdx) >= len(dc.table.Component) {
break
}
componentData := dc.table.Component[componentIdx]
ligatureIdx += int(componentData)
if debugMode >= 2 {
fmt.Printf("\tLigature - Action store %d last %d\n", action&tt.MLActionStore, action&tt.MLActionLast)
}
if action&(tt.MLActionStore|tt.MLActionLast) != 0 {
if ligatureIdx >= len(dc.table.Ligatures) {
break
}
lig := dc.table.Ligatures[ligatureIdx]
if debugMode >= 2 {
fmt.Printf("\tLigature - Produced ligature %d\n", lig)
}
buffer.replaceGlyphIndex(lig)
ligEnd := dc.matchPositions[(dc.matchLength-1)%len(dc.matchPositions)] + 1
/* Now go and delete all subsequent components. */
for dc.matchLength-1 > cursor {
if debugMode >= 2 {
fmt.Println("\tLigature - Skipping ligature component")
}
dc.matchLength--
buffer.moveTo(dc.matchPositions[dc.matchLength%len(dc.matchPositions)])
buffer.replaceGlyphIndex(0xFFFF)
}
buffer.moveTo(ligEnd)
buffer.mergeOutClusters(dc.matchPositions[cursor%len(dc.matchPositions)], len(buffer.outInfo))
}
actionData = actionData[1:]
}
buffer.moveTo(end)
}
}
type driverContextInsertion struct {