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harfbuzz.go
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harfbuzz.go
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//go:build !harfbuzz || js
package text
import (
"bytes"
"github.com/go-text/typesetting/harfbuzz"
"github.com/go-text/typesetting/language"
fontapi "github.com/go-text/typesetting/opentype/api/font"
"github.com/go-text/typesetting/opentype/loader"
"github.com/jilieryuyi/canvas/font"
)
// Shaper is a text shaper formatting a string in properly positioned glyphs.
type Shaper struct {
font *harfbuzz.Font
}
// NewShaper returns a new text shaper.
func NewShaper(b []byte, _ int) (Shaper, error) {
loader, err := loader.NewLoader(bytes.NewReader(b))
if err != nil {
return Shaper{}, err
}
font, err := fontapi.NewFont(loader)
if err != nil {
return Shaper{}, err
}
return Shaper{
font: harfbuzz.NewFont(&fontapi.Face{Font: font}),
}, nil
}
// NewShaperSFNT returns a new text shaper using a SFNT structure.
func NewShaperSFNT(sfnt *font.SFNT) (Shaper, error) {
// TODO: add interface to SFNT for use in this harfbuzz implementation
return NewShaper(sfnt.Data, 0)
}
// Destroy destroys the allocated C memory.
func (s Shaper) Destroy() {
}
// Shape shapes the string for a given direction, script, and language.
func (s Shaper) Shape(text string, ppem uint16, direction Direction, script Script, lang string, features string, variations string) []Glyph {
buf := harfbuzz.NewBuffer()
rtext := []rune(text)
buf.AddRunes(rtext, 0, -1)
buf.ClusterLevel = harfbuzz.MonotoneCharacters
buf.Props.Direction = harfbuzz.Direction(direction)
buf.Props.Script = language.Script(script)
buf.Props.Language = language.NewLanguage(lang)
buf.GuessSegmentProperties() // only sets direction, script, and language if unset
buf.Shape(s.font, nil)
runeMap := make([]int, len(rtext)+1)
j := 0
for i := range text {
runeMap[j] = i
j++
}
runeMap[len(rtext)] = len(text)
glyphs := make([]Glyph, len(buf.Info))
for i := 0; i < len(buf.Info); i++ {
info := buf.Info[i]
position := buf.Pos[i]
glyphs[i].ID = uint16(info.Glyph)
glyphs[i].Cluster = uint32(runeMap[info.Cluster])
glyphs[i].XAdvance = int32(position.XAdvance)
glyphs[i].YAdvance = int32(position.YAdvance)
glyphs[i].XOffset = int32(position.XOffset)
glyphs[i].YOffset = int32(position.YOffset)
glyphs[i].Text = rtext[info.Cluster]
}
return glyphs
}
func LookupScript(r rune) Script {
return Script(language.LookupScript(r))
}
// Direction is the text direction.
type Direction int
// see Direction
const (
DirectionInvalid Direction = 0
LeftToRight = Direction(harfbuzz.LeftToRight)
RightToLeft = Direction(harfbuzz.RightToLeft)
TopToBottom = Direction(harfbuzz.TopToBottom)
BottomToTop = Direction(harfbuzz.BottomToTop)
)
//go:generate stringer -type Script
// Script is the script.
type Script uint32
// see Script
const (
ScriptInvalid Script = 0
ScriptCommon = Script(language.Common)
ScriptInherited = Script(language.Inherited)
ScriptUnknown = Script(language.Unknown)
Arabic = Script(language.Arabic)
Armenian = Script(language.Armenian)
Bengali = Script(language.Bengali)
Cyrillic = Script(language.Cyrillic)
Devanagari = Script(language.Devanagari)
Georgian = Script(language.Georgian)
Greek = Script(language.Greek)
Gujarati = Script(language.Gujarati)
Gurmukhi = Script(language.Gurmukhi)
Hangul = Script(language.Hangul)
Han = Script(language.Han)
Hebrew = Script(language.Hebrew)
Hiragana = Script(language.Hiragana)
Kannada = Script(language.Kannada)
Katakana = Script(language.Katakana)
Lao = Script(language.Lao)
Latin = Script(language.Latin)
Malayalam = Script(language.Malayalam)
Oriya = Script(language.Oriya)
Tamil = Script(language.Tamil)
Telugu = Script(language.Telugu)
Thai = Script(language.Thai)
Tibetan = Script(language.Tibetan)
Bopomofo = Script(language.Bopomofo)
Braille = Script(language.Braille)
CanadianSyllabics = Script(language.Canadian_Aboriginal)
Cherokee = Script(language.Cherokee)
Ethiopic = Script(language.Ethiopic)
Khmer = Script(language.Khmer)
Mongolian = Script(language.Mongolian)
Myanmar = Script(language.Myanmar)
Ogham = Script(language.Ogham)
Runic = Script(language.Runic)
Sinhala = Script(language.Sinhala)
Syriac = Script(language.Syriac)
Thaana = Script(language.Thaana)
Yi = Script(language.Yi)
Deseret = Script(language.Deseret)
Gothic = Script(language.Gothic)
OldItalic = Script(language.Old_Italic)
Buhid = Script(language.Buhid)
Hanunoo = Script(language.Hanunoo)
Tagalog = Script(language.Tagalog)
Tagbanwa = Script(language.Tagbanwa)
Cypriot = Script(language.Cypriot)
Limbu = Script(language.Limbu)
LinearB = Script(language.Linear_B)
Osmanya = Script(language.Osmanya)
Shavian = Script(language.Shavian)
TaiLe = Script(language.Tai_Le)
Ugaritic = Script(language.Ugaritic)
Buginese = Script(language.Buginese)
Coptic = Script(language.Coptic)
Glagolitic = Script(language.Glagolitic)
Kharoshthi = Script(language.Kharoshthi)
NewTaiLue = Script(language.New_Tai_Lue)
OldPersian = Script(language.Old_Persian)
SylotiNagri = Script(language.Syloti_Nagri)
Tifinagh = Script(language.Tifinagh)
Balinese = Script(language.Balinese)
Cuneiform = Script(language.Cuneiform)
Nko = Script(language.Nko)
PhagsPa = Script(language.Phags_Pa)
Phoenician = Script(language.Phoenician)
Carian = Script(language.Carian)
Cham = Script(language.Cham)
KayahLi = Script(language.Kayah_Li)
Lepcha = Script(language.Lepcha)
Lycian = Script(language.Lycian)
Lydian = Script(language.Lydian)
OlChiki = Script(language.Ol_Chiki)
Rejang = Script(language.Rejang)
Saurashtra = Script(language.Saurashtra)
Sundanese = Script(language.Sundanese)
Vai = Script(language.Vai)
Avestan = Script(language.Avestan)
Bamum = Script(language.Bamum)
EgyptianHieroglyphs = Script(language.Egyptian_Hieroglyphs)
ImperialAramaic = Script(language.Imperial_Aramaic)
InscriptionalPahlavi = Script(language.Inscriptional_Pahlavi)
InscriptionalParthian = Script(language.Inscriptional_Parthian)
Javanese = Script(language.Javanese)
Kaithi = Script(language.Kaithi)
Lisu = Script(language.Lisu)
MeeteiMayek = Script(language.Meetei_Mayek)
OldSouthArabian = Script(language.Old_South_Arabian)
OldTurkic = Script(language.Old_Turkic)
Samaritan = Script(language.Samaritan)
TaiTham = Script(language.Tai_Tham)
TaiViet = Script(language.Tai_Viet)
Batak = Script(language.Batak)
Brahmi = Script(language.Brahmi)
Mandaic = Script(language.Mandaic)
Chakma = Script(language.Chakma)
MeroiticCursive = Script(language.Meroitic_Cursive)
MeroiticHieroglyphs = Script(language.Meroitic_Hieroglyphs)
Miao = Script(language.Miao)
Sharada = Script(language.Sharada)
SoraSompeng = Script(language.Sora_Sompeng)
Takri = Script(language.Takri)
BassaVah = Script(language.Bassa_Vah)
CaucasianAlbanian = Script(language.Caucasian_Albanian)
Duployan = Script(language.Duployan)
Elbasan = Script(language.Elbasan)
Grantha = Script(language.Grantha)
Khojki = Script(language.Khojki)
Khudawadi = Script(language.Khudawadi)
LinearA = Script(language.Linear_A)
Mahajani = Script(language.Mahajani)
Manichaean = Script(language.Manichaean)
MendeKikakui = Script(language.Mende_Kikakui)
Modi = Script(language.Modi)
Mro = Script(language.Mro)
Nabataean = Script(language.Nabataean)
OldNorthArabian = Script(language.Old_North_Arabian)
OldPermic = Script(language.Old_Permic)
PahawhHmong = Script(language.Pahawh_Hmong)
Palmyrene = Script(language.Palmyrene)
PauCinHau = Script(language.Pau_Cin_Hau)
PsalterPahlavi = Script(language.Psalter_Pahlavi)
Siddham = Script(language.Siddham)
Tirhuta = Script(language.Tirhuta)
WarangCiti = Script(language.Warang_Citi)
Adlam = Script(language.Adlam)
Bhaiksuki = Script(language.Bhaiksuki)
Marchen = Script(language.Marchen)
Osage = Script(language.Osage)
Tangut = Script(language.Tangut)
Newa = Script(language.Newa)
MasaramGondi = Script(language.Masaram_Gondi)
Nushu = Script(language.Nushu)
Soyombo = Script(language.Soyombo)
ZanabazarSquare = Script(language.Zanabazar_Square)
Dogra = Script(language.Dogra)
GunjalaGondi = Script(language.Gunjala_Gondi)
HanifiRohingya = Script(language.Hanifi_Rohingya)
Makasar = Script(language.Makasar)
Medefaidrin = Script(language.Medefaidrin)
OldSogdian = Script(language.Old_Sogdian)
Sogdian = Script(language.Sogdian)
Elymaic = Script(language.Elymaic)
Nandinagari = Script(language.Nandinagari)
NyiakengPuachueHmong = Script(language.Nyiakeng_Puachue_Hmong)
Wancho = Script(language.Wancho)
Chorasmian = Script(language.Chorasmian)
DivesAkuru = Script(language.Dives_Akuru)
KhitanSmallScript = Script(language.Khitan_Small_Script)
Yezidi = Script(language.Yezidi)
)