opentype_typographic_features: OpenType Typographic Features

In hrbrmstr/hrbragg: Typography-centric Themes, Theme Components, and Utilities for 'ggplot2' and 'ragg'.

Description

Quick reference table describing the four-character feature codes. A more complete quick reference can be found on Wikipedia and a complete OpenType feature list specification can be found at Microsoft.

Details

• aalt (Access All Alternates): Special feature: used to present user with choice all alternate forms of the character

• abvf (Above-base Forms): Replaces the above-base part of a vowel sign. For Khmer and similar scripts.

• abvm (Above-base Mark Positioning): Positions a mark glyph above a base glyph.

• abvs (Above-base Substitutions): Ligates a consonant with an above-mark.

• afrc (Alternative Fractions): Converts figures separated by slash with alternative stacked fraction form

• akhn (Akhand): Hindi for unbreakable. Ligates consonant+halant+consonant, usually only for k-ss and j-ny combinations.

• blwf (Below-base Forms): Replaces halant+consonant combination with a subscript form.

• blwm (Below-base Mark Positioning): Positions a mark glyph below a base glyph

• blws (Below-base Substitutions): Ligates a consonant with a below-mark.

• c2pc (Capitals to Petite Caps): Substitutes capital letters with petite caps

• c2sc (Capitals to Small Caps): Substitutes capital letters with small caps

• calt (Contextual Alternates): Applies a second substitution feature based on a match of a character pattern within a context of surrounding patterns

• case (Case Sensitive Forms): Replace characters, especially punctuation, with forms better suited for all-capital text, cf. titl

• ccmp (Glyph Composition/Decomposition): Either calls a ligature replacement on a sequence of characters or replaces a character with a sequence of glyphs. Provides logic that can for example effectively alter the order of input characters.

• cfar (Conjunct Form After Ro): Khmer

• cjct (Conjunct Forms): Ligates consonant+halant+consonant, indicates part of a conjunct.

• clig (Contextual Ligatures): Applies a second ligature feature based on a match of a character pattern within a context of surrounding patterns

• cpct (Centered CJK Punctuation): Positions punctuation marks vertically and horizontally

• cpsp (Capital Spacing): Adjusts spacing between letters in all-capitals text

• cswh (Contextual Swash): Converts letter to a swashed version based on characters around the letter

• curs (Cursive Positioning): Precise positioning of a letter's connection to an adjacent one

• cv01–cv99 (Character Variant 1–99): Multiple variants of a single character, which may not apply to many other characters, see references for voluminous documentation

• dist (Distance): Adjusts horizontal positioning between glyphs. (Always enabled, as opposed to 'kern'.)

• dlig (Discretionary Ligatures): Ligatures to be applied at the user's discretion

• dnom (Denominator): Converts to appropriate fraction denominator form, invoked by frac

• dtls (Dotless Forms):

• expt (Expert Forms): Typographic alternatives for some Japanese tetragrams

• falt (Final Glyph on Line Alternates): Replaces final glyph on the line with an alternate

• fin2 (Terminal Form #2): Syriac

• fin3 (Terminal Form #3): Syriac

• fina (Terminal Forms): Substitutes a special form of a letter at end of words (required by Arabic and Syriac)

• flac (Flattened accent forms):

• frac (Fractions): Converts figures separated by slash with diagonal fraction

• fwid (Full Widths): Substitutes proportionally spaced character with full-width versions (esp. for Latin letters within Chinese)

• half (Half Form): Replaces consonant+halant with a half form, indicating it is part of a conjunct.

• haln (Halant Forms): Replaces a glyph for final consonant+halant.

• halt (Alternate Half Widths): Re-positions full-width glyphs on half-width spaces

• hist (Historical Forms): Obsolete forms of characters to be applied at the user's discretion, cf. hlig

• hkna (Horizontal Kana Alternates): Alternate forms for horizontal kana text, e.g. ー for chōonpu instead of ｜, cf. vkna

• hlig (Historical Ligatures): Obsolete ligatures to be applied at the user's discretion

• hngl (Hangul): Transliterates Chinese-style characters with Korean Hangul

• hojo (Hojo Kanji Forms): Hojo alternates for Japanese tetragrams

• hwid (Half Widths): Substitutes uniformly-spaced characters with half-width version

• init (Initial Forms): Substitutes a special form of a letter occurring at the beginning of a word (required by Arabic and Syriac)

• isol (Isolated Forms): Substitutes a special form of a letter occurring outside a word (required by Arabic and Syriac)

• ital (Italics): Replaces letter with corresponding italic glyph

• jalt (Justification Alternates): User selectable wider and narrower alternates, used especially for justifying

• jp04 (JIS 04 Forms): JIS 2004 alternates for Japanese tetragrams, not accessible per Unicode

• jp78 (JIS 78 Forms): JIS C 6226-1978 alternates for Japanese tetragrams, not accessible per Unicode

• jp83 (JIS 83 Forms): JIS X 0208-1983 alternates for Japanese tetragrams, not accessible per Unicode

• jp90 (JIS 90 Forms): JIS X 0208-1990 alternates for Japanese tetragrams, not accessible per Unicode

• kern (Kerning): Fine horizontal positioning of one glyph to the next, based on the shapes of the glyphs

• lfbd (Left Bounds): Re-positions glyphs at end of line. Called by opbd.

• liga (Standard Ligatures): Replaces (by default) sequence of characters with a single ligature glyph

• ljmo (Leading Jamo Forms): Initial group of consonants for a synthesized Korean Hangul tetragram

• lnum (Lining Figures): Replaces numerals with glyphs meant to fit better in all-capitals text, often also tnum

• locl (Localized Forms): Substitutes character with the preferred form based on script language

• ltra (Left-to-right glyph alternates): Replaces characters with forms befitting left-to-right presentation (except mirrored forms)

• ltrm (Left-to-right mirrored forms): Replaces characters with possibly mirrored forms befitting left-to-right presentation

• mark (Mark Positioning): Fine positioning of a mark glyph to a base character

• med2 (Medial Form #2): Syriac

• medi (Medial Forms): Substitutes a special form of letters between other letters in words (required by Arabic and Syriac)

• mgrk (Mathematical Greek): Replaces Greek characters with special forms for use in mathematics

• mkmk (Mark-to-mark Positioning): Fine positioning of a mark glyph to another mark character

• mset (Mark Positioning via Substitution): Used in Windows 95 for positioning of Arabic marks

• nalt (Alternate Annotation Forms): Provides user access to circled digits, inverse letters etc.

• nlck (NLC Kanji Forms): NLC alternates for Japanese tetragrams

• nukt (Nukta Forms): Replace consonant+nukta (dot mark) with single glyph.

• numr (Numerator): Converts to appropriate fraction numerator form, invoked by frac

• onum (Oldstyle Figures): Replaces numerals with cased old-style numerals, often also pnum

• opbd (Optical Bounds): Re-positions glyphs at beginning and end of line, for precise justification of text.

• ordn (Ordinals): Replaces characters with ordinal forms for use after numbers

• ornm (Ornaments): Decorative alternates for the bullet character •

• palt (Proportional Alternates): Re-positions otherwise monospace characters according to glyph width

• pcap (Petite Caps): Substitute lower-case letters with their petite caps analogs

• pkna (Proportional Kana): Kana for use alongside alphabets, without grid typography

• pnum (Proportional Figures): Replaces numerals with glyphs of proportional width, often also onum

• pref (Pre-base Forms): Replaces halant+consonant at the end of a consonant cluster with a glyph at the beginning. Khmer, Myanmar, Malayalam, Telugu

• pres (Pre-base Substitutions): Ligates consonant combinations.

• pstf (Post-base Forms): Substitutes final halant+consonant with special form. Khmer and Gurmukhi, Malayalam

• psts (Post-base Substitutions): Ligates a final consonant+consonant.

• pwid (Proportional Widths): Replaces uniformly-spaced glyphs with proportional ones

• qwid (Quarter Widths): Replaces uniformly-spaced glyphs with quarter-width ones (punctuation etc.)

• rand (Randomize): Replaces character with random forms (meant to simulate handwriting)

• rclt (Required Contextual Alternates): Contextual alternates required for correct text display which differs from the default join for other letters, required especially important by Arabic

• rkrf (Rakar Forms): Replaces halant+ra with a rakar glyph, indicating it is part of a conjunct.

• rlig (Required Ligatures): Ligatures required for correct text display (any script, but in cursive)

• rphf (Reph Form): Replaces initial ra+halant with a final reph mark, indicating part of a conjunct.

• rtbd (Right Bounds): Re-positions glyphs at beginning of line. Called by opbd.

• rtla (Right-to-left glyph alternates): Replaces characters with forms befitting right-to-left presentation (except mirrored forms)

• rtlm (Right-to-left mirrored forms): Replaces characters with possibly mirrored forms befitting right-to-left presentation

• ruby (Ruby Notation Forms): Ruby characters, small print

• rvrn (Required Variation Alternates): Special variants of a single character, which need apply to specific font variation, required by variable fonts

• salt (Stylistic Alternates): Either replaces with, or displays list of, stylistic alternatives for a character

• sinf (Scientific Inferiors): as in "H2O", "SOx" or "YCbCr" (but using the same font weight and predefined position in contrast these plain HTML subs and sups)

• size (Optical size): Not a lookup: feature's table provides to applications information about the appearance and intent of the font, to aid in font selection.

• smcp (Small Caps): Substitutes lower-case letters with small caps versions

• smpl (Simplified Forms): Replaces sinograms with their simplified versions, may be language dependent

• ss01-ss20 (Stylistic Set 1 – 20): Replaces character with one from a font-specific set of stylistic alternatives

• ssty (Math script style alternates):

• stch (Stretching Glyph Decomposition): Substitutes a special form of a stretchy glyph onto one or more letters (required by Syriac)

• subs (Subscript): Replaces character with subscript version, cf. numr

• sups (Superscript): Replaces character with superscript version, cf. dnom

• swsh (Swash): Either replaces character with or displays multiple swashed versions

• titl (Titling Alternates): Replaces characters with forms suited for large type, as in titles

• tjmo (Trailing Jamo Forms): Final group of consonants for a synthesized Korean Hangul tetragram

• tnam (Traditional Name Forms): Japanese alternates for proper names

• tnum (Tabular Figures): Replaces numerals with glyphs of uniform width, often also lnum

• trad (Traditional Forms): Replaces Chinese characters with their traditional versions

• twid (Third Widths): Substitutes uniformly-spaced character with a version of 1/3 width (punctuation, etc.)

• unic (Unicase): Replaces lowercase and uppercase letters with a set of single case glyphs

• valt (Alternative Vertical Metrics): Positions shorter characters to be centered vertically with full-height characters

• vatu (Vattu Variants): Replaces consonant+rakar combinations with a vattu variant ligature.

• vert (Vertical Alternates): A subset of vrt2: prefer the latter feature

• vhal (Alternative Vertical Half Metrics): Positions characters to be centered vertically with half-height characters

• vjmo (Vowel Jamo Forms): Medial group of vowels for a synthesized Korean Hangul tetragram

• vkna (Vertical Kana): Alternate Japanese kana forms for vertical text, e.g. ｜ for chōonpu instead of ー, cf. hkna

• vkrn (Vertical Kerning): Fine vertical positioning of characters based on shape

• vpal (Proportional Alternate Vertical Metrics): Re-positions glyphs vertically to be centered on proportional full-height characters

• vrt2 (Vertical Alternates and Rotation): Replaces characters with forms suitable for vertical writing, possibly by rotating 90°

• vrtr (Vertical Alternates for Rotation): Replaces characters with forms suitable for vertical writing, possibly by shifting or shape

• zero (Slashed Zero): Replaces 0 figure with slashed 0

hrbrmstr/hrbragg documentation built on Feb. 3, 2022, 1:39 a.m.