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_UI_ENUM(uiAttribute) {
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uiAttributeFamily,
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uiAttributeSize, // use Double
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uiAttributeWeight,
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uiAttributeItalic,
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uiAttributeStretch,
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uiAttributeColor, // use R, G, B, A
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uiAttributeBackground, // use R, G, B, A
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// TODO kerning amount
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// OS X: kCTKernAttributeName
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// > 0: farther (TODO from advance or standard kerning?)
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// == 0: no kerning
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// < 0: closer (TODO same)
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// undefined: standard kerning
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// Pango: pango_attr_letter_spacing_new()
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// parameter meaning unspecified
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// Windows: requires Platform Update, SetLetterSpacing()
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// parameter meaning unspecified
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uiAttributeUnderline, // enum uiDrawUnderlineStyle
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// TODO what is the color in the case we don't specify it, black or the text color?
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uiAttributeUnderlineColor, // enum uiDrawUnderlineColor
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// TODO kCTSuperscriptAttributeName vs below
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// all it does is set the below attribute so
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// TODO kCTBaselineClassAttributeName, kCTBaselineInfoAttributeName, kCTBaselineReferenceInfoAttributeName
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// TODO strikethroughs? (pango yes, directwrite yes, os x no)
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// TODO baseline offsets? (pango yes)
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// TODO size scales? (pango yes)
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// TODO fallbacks (pango: enable or disable)
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// TODO document that this will also enable language-specific font features (TODO on DirectWrite too?)
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// TODO document that this should be strict BCP 47 form (A-Z, a-z, 0-9, and -) for maximum compatibility
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uiAttributeLanguage, // BCP 47 string
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// These attributes represent typographic features. Each feature
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// is a separate attribute, to make composition easier. The
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// availability of for each attribute are defined by the font; the
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// default values are defined by the font and/or by the OS.
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//
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// A note about features whose parameter is an enumeration:
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// OS X defines typographic features using the AAT specification
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// and converts to OpenType internally when needed, whereas
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// other platforms use OpenType directly. OpenType is less
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// precise about what each enumeration value means than AAT
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// is, so enumeration values do not necessarily represent what
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// OS X expects with all fonts. In cases where they do, libui
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// provides an enumeration type to use. Otherwise, the AAT
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// enumeration values are provided in comments for
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// documentation purposes.
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// TODO kAllTypographicFeaturesType
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// AAT calls these "common ligatures"
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uiAttributeStandardLigatures, // 0 = off, 1 = on
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uiAttributeRequiredLigatures, // 0 = off, 1 = on
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// AAT calls these "rare ligatures"
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uiAttributeDiscretionaryLigatures, // 0 = off, 1 = on
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uiAttributeContextualLigatures, // 0 = off, 1 = on
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uiAttributeHistoricalLigatures, // 0 = off, 1 = on
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// TODO uiAttributeCursiveConnection, // 0 = none, 1 = some, 2 = all
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uiAttributeUnicase, // 0 = off, 1 = on
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// TODO uiAttributeLinguisticRearrangement, // 0 = off, 1 = on
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// TODO rename this
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uiAttributeNumberSpacings, // enum uiAttributeNumberSpacing
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// TODO kSmartSwashType, falt and jalt
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// TODO kDiacriticsType
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uiAttributeSuperscripts, // enum uiAttributeSuperscript
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uiAttributeFractionForms, // enum uiAttributeFractionForm
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uiAttributeSlashedZero, // 0 = off, 1 = on
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uiAttributeMathematicalGreek, // 0 = off, 1 = on
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// AAT defines the following values:
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// 0 = none
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// 1 = dingbats
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// 2 = pi characters
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// 3 = fleurons
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// 4 = decorative borders
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// 5 = international symbols
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// 6 = mathematical symbols
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// OpenType says alphanumeric characters must(? TODO) have one form each and the bullet character U+2022 (•) can have many
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uiAttributeOrnamentalForms, // an integer from 0 to a font-specified upper bound
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// TODO provide a function to get the upper bound?
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// AAT calls this "character alternatives" and defines the
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// following values:
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// 0 = none
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// OpenType calls this "access all alternates".
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// TODO doesn't OpenType do the same about 0?
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uiAttributeSpecificCharacterForm, // an integer from 0 to a font-specified upper bound
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// TODO provide a function to get the upper bound?
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uiAttributeTitlingCapitalForms, // 0 = off, 1 = on
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// AAT calls these "character shapes"
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uiAttributeHanCharacterForms, // enum uiAttributeHanCharacterForm
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// OpenType calls these "old-style"
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uiAttributeLowercaseNumbers, // 0 = off, 1 = on
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// TODO kTextSpacingType
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// see kKanaSpacingType below
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uiAttributeHanjaToHangul, // 0 = off, 1 = on
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// AAT defines the following values:
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// 0 = none
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// 1 = box
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// 2 = rounded box
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// 3 = circle
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// 4 = inverted circle
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// 5 = parentheses
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// 6 = period
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// 7 = roman numeral
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// 8 = diamond
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// 9 = inverted box
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// 10 = inverted rounded box
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// TODO rename to AnnotatedForms?
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uiAttributeAnnotatedGlyphForms, // an integer from 0 to a font-specified upper bound
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// TODO provide a function to get the upper bound?
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// TODO kKanaSpacingType
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// TODO kIdeographicSpacingType
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// can they be provided independently of kTextSpacingType? Core Text doesn't seem to
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// TODO kUnicodeDecompositionType
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uiAttributeRubyKanaForms, // 0 = off, 1 = on
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// TODO kCJKVerticalRomanPlacementType
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// this is 'valt' in OpenType but I don't know if I want to make it selectable or not
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uiAttributeCJKRomansToItalics, // 0 = off, 1 = on
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// AAT calls this "case-sensitive layout"
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uiAttributeCaseSensitiveForms, // 0 = off, 1 = on
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// AAT: this is called "case-sensitive spacing"
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uiAttributeCapitalSpacing, // 0 = off, 1 = on
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uiAttributeAlternateHorizontalKana, // 0 = off, 1 = on
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uiAttributeAlternateVerticalKana, // 0 = off, 1 = on
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// TODO "Alternate"? unify all this
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// TODO document that these are guaranteed to be consecutive
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uiAttributeStylisticAlternate1, // 0 = off, 1 = on
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uiAttributeStylisticAlternate2, // 0 = off, 1 = on
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uiAttributeStylisticAlternate3, // 0 = off, 1 = on
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uiAttributeStylisticAlternate4, // 0 = off, 1 = on
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uiAttributeStylisticAlternate5, // 0 = off, 1 = on
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uiAttributeStylisticAlternate6, // 0 = off, 1 = on
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uiAttributeStylisticAlternate7, // 0 = off, 1 = on
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uiAttributeStylisticAlternate8, // 0 = off, 1 = on
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uiAttributeStylisticAlternate9, // 0 = off, 1 = on
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uiAttributeStylisticAlternate10, // 0 = off, 1 = on
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uiAttributeStylisticAlternate11, // 0 = off, 1 = on
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uiAttributeStylisticAlternate12, // 0 = off, 1 = on
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uiAttributeStylisticAlternate13, // 0 = off, 1 = on
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uiAttributeStylisticAlternate14, // 0 = off, 1 = on
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uiAttributeStylisticAlternate15, // 0 = off, 1 = on
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uiAttributeStylisticAlternate16, // 0 = off, 1 = on
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uiAttributeStylisticAlternate17, // 0 = off, 1 = on
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uiAttributeStylisticAlternate18, // 0 = off, 1 = on
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uiAttributeStylisticAlternate19, // 0 = off, 1 = on
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uiAttributeStylisticAlternate20, // 0 = off, 1 = on
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uiAttributeContextualAlternates, // 0 = off, 1 = on
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uiAttributeSwashes, // 0 = off, 1 = on
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uiAttributeContextualSwashes, // 0 = off, 1 = on
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uiAttributeLowercaseCapForms, // enum uiAttributeCapForm
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uiAttributeUppercaseCapForms, // enum uiAttributeCapForm
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// TODO kCJKRomanSpacingType
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// TODO uiAttributeSystem, (this might not be doable with DirectWrite)
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// TODO uiAttributeCustom,
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};
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