Qee cov neeg siv uas siv txoj kev hintfull hinting tej zaum yuav pom tias thaum kho dua tshiab ntawm Pango version 1.43 txog 1.44 tej tsev neeg font los yog .
Qhov teeb meem yog tshwm sim los ntawm lub tsev qiv ntawv hloov los ntawm kev siv rau cov ntaub ntawv hais txog kerning (qhov deb ntawm glyphs) ntawm fonts , thiab developers ntawm lub tom kawg txiav txim siab font smoothing siv txoj kev "hintfull". Nws tau muab sau tseg tias ntawm cov ntxaij vab tshaus nrog siab pixel ceev (Hi-DPI), teeb meem nrog kev nthuav qhia fonts thaum siv hinting txoj kev uas tsis yog "hintfull" tsis tshwm sim.
HarfBuzz tus tsim tawm (Behdad Esfahbod) los ntawm kev sib tham txog qhov teeb meem:
Kuv sim siv hinting yam uas tsis yog hintfull, tab sis tsuas yog nws muab font zaub ze rau ClearType v2 hauv Windows 7, uas, hauv kuv lub tswv yim, muaj qhov ua tau zoo tshaj plaws ntawm txhua qhov kev daws teeb meem uas twb muaj lawm.
Txoj cai. Yog li ntawd, peb tau txiav txim siab tsis txhawb nws ntxiv lawm. Koj tuaj yeem sim ua kom siv cov tshuaj soapy rendering lossis sim nrhiav lwm yam. Koj siv Open Source, nkag siab?
Ntxiv hauv qab no sib tham ntxiv:
Hauv cov lus tom ntej tus tsim tawm uas qhib qhov software muab lub sijhawm los xaiv thiab cov uas tsis txaus siab rau lub xeev tam sim no tuaj yeem tsim ib rab diav rawg ntawm Pango. Cov neeg tsim khoom ntawm HarfBuzz tsis tuaj yeem cuam tshuam nws txoj kev saib xyuas thiab kev txiav txim siab hauv nws. Behdad Esfahbod, tus saib xyuas HarfBuzz tam sim no uas yog # XNUMX hauv kev cog lus
, tau hais tias nws tsis tau koom nrog Red Hat rau ntau dua 10 xyoo thiab tsis yog tus saib xyuas Pango. Txij li xyoo 2010, nws tau tsiv mus rau Google thiab tam sim no ua haujlwm tsuas yog nrog HarfBuzz, uas yog yav dhau los nws tus kheej qhov project. HarfBuzz rendering txheej txheem thiab Pango muaj peev xwm override thov hinting hom ntawm nws sab.
Lwm tus tsim tawm HarfBuzz , hais tias qhov teeb meem yog nyob rau ntawm Pango sab, txij li HarfBuzz tsis yog font rendering system thiab tsis txhawb hinting los ntawm nws cov architecture. Yog tias Pagno xav tau kev tuav pov hwm, ces hloov mus rau HarfBuzz tsis yog qhov kev xaiv los tso siab rau nws txoj kev txhawb nqa. IN Cov laj thawj ntawm kev tsis kam siv cov lus qhia hauv HarfBuzz yog tias qee qhov hinting hom ua rau muaj kev hloov pauv hauv qhov dav dav ntawm glyph thiab qhov kev hloov pauv no nyob ntawm qhov loj pixel. Pango yav dhau los ua haujlwm zoo sib xws los ntawm FreeType, uas txhawb nqa kev qhia, tab sis tom qab ntawd hloov mus rau HarfBuzz, uas ua haujlwm glyphs yam tsis siv rau lawv qhov loj me. Yog li ntawd, kev daws teeb meem ntsib thaum siv Pango yog Pango lub luag haujlwm, tsis yog HarfBuzz's.
Thaum kawg Behdad Esfahbod ib tug loj rov qab ntawm txoj kev loj hlob ntawm Linux font pawg. Tom qab nws tawm mus rau Google, lub tsev qiv ntawv Pango thiab Cairo tau raug tso tseg thiab poob rau hauv stagnation. Ntawm HarfBuzz, ua haujlwm tau tsom mus rau kev txhawb nqa rau kev hloov pauv hloov pauv-fonts, thaum Red Hat tsom rau GTK thiab Glib. Sij hawm dhau mus, kev txhim kho hauv thaj tsam ntawm cov ntawv hloov pauv tau hloov mus rau FreeType, fontconfig thiab Cairo, tab sis tseem ua tsis tiav hauv Pango vim tsis muaj cov neeg tsim tawm. Kev nkag mus rau APIs tshiab hauv Pango tau muab los ntawm FontMap abstraction thiab tsuas yog txhawb nqa rau FreeType-based backends. Backends rau Windows thiab macOS tau tsis tu ncua rau ntau tshaj 10 xyoo.
Ua raws li kev nthuav dav ntawm cov khoom siv mobile thiab browsers, Microsoft tau tso tseg kev txhawb nqa subpixel font rendering thiab GDI-style rendering hauv Windows 8. macOS ib txwm txhawb nqa kev ua haujlwm, uas hauv qhov kev sib tham no hu ua "blurry". Txij li xyoo 2018, ntau tus neeg tsim khoom HarfBuzz tau sim coj HarfBuzz cov yam ntxwv ntxiv rau ntau xyoo rau Pango. Nyob rau tib lub sijhawm nrog kev txhim kho ntawm GTK4, kev hloov pauv mus rau OpenGL-raws li rendering tau ua, uas txhais tau hais tias cov kab ntawv sib tw, uas ua rau muaj kev tawm tsam ntawm pixel rendering thiab scalable layout.
LibreOffice, Chrome thiab Firefox tau hloov mus siv HarfBuzz ua lub cav sib koom ua ke, ntawm tus nqi txiav tawm kev txhawb nqa rau bitmap fonts thiab hom Type1. Rau bitmap fonts, cov uas xav tau lawv tau hais kom hloov lawv mus rau hauv OpenType thawv. Kev thov raug xa mus rau Adobe los siv Type1 rau HarfBuzz, tab sis lawv tau teb tias tsis muaj qhov tseem ceeb hauv qhov no, vim lawv lawv tus kheej yuav tsum tsis txhob txhawb nqa Type1 xyoo no.
Txhawm rau kom tau txais cov thev naus laus zis siab, qhov kev txiav txim siab zoo sib xws hloov mus rau HarfBuzz tau tsim rau lub tsev qiv ntawv Pango. Tus nqi yog qhov kev txiav tawm ntawm kev txhawb nqa rau qee qhov qub thev naus laus zis los ntawm 20 xyoo dhau los. Nws tau qhia tias, muab cov peev txheej tsawg, cov neeg tsim khoom tsis muaj tes txaus los ua txhua yam thiab cov neeg nyiam khaws cov thev naus laus zis qub tuaj yeem sim nrhiav ib tus neeg uas yuav npaj txhij los tswj cov haujlwm uas lawv ploj lawm. Raws li kev sib piv, GNOME3 tau muab, tom qab qhov pom ntawm qhov tsis txaus siab tuaj yeem txuas ntxiv txhim kho cov thev naus laus zis GNOME2 nyob rau hauv lub moj khaum ntawm Mate thiab Cinnamon tej yaam num. Tib yam siv rau Pango, tab sis tseem tsis tau muaj cov neeg siv khoom.
Tau qhov twg los: opennet.ru