{"id":81072,"date":"2020-05-10T19:42:00","date_gmt":"2020-05-10T17:42:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/razrabotchiki-steka-shriftov-linux-otkazalis-ot-podderzhki-myagkogo-sglazhivaniya"},"modified":"2020-05-10T19:42:00","modified_gmt":"2020-05-10T17:42:00","slug":"razrabotchiki-steka-shriftov-linux-otkazalis-ot-podderzhki-myagkogo-sglazhivaniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/razrabotchiki-steka-shriftov-linux-otkazalis-ot-podderzhki-myagkogo-sglazhivaniya","title":{"rendered":"Razvojni tim Linux font stacka odustao je od podr\u0161ke za meko anti-aliasing.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Neki korisnici koji koriste metodu hintinga «hintfull» mogli su primijetiti da prilikom prelaska s verzije Pango 1.43 na 1.44 kerning<\/a><\/noindex> nekih fontova se pogor\u0161ao.<\/a><\/noindex> ili Potpuno.<\/a><\/noindex> Pokvario se.<\/a><\/noindex>.<\/p>\n

\"Razvojni<\/a><\/noindex><\/center><\/p>\n

Problem je uzrokovan time \u0161to je biblioteka Pango<\/a><\/noindex> pre\u0161la s kori\u0161tenja FreeType<\/a><\/noindex> za dobivanje informacija o kerningu (udaljenosti izme\u0111u glifa) fontova na HarfBuzz,<\/a><\/noindex>a programeri posljednjeg su odlu\u010dili ne podr\u017eavati<\/a><\/noindex> smanjenje fontova prema metodi «hintfull». Primje\u0107uje se da na ekranima s visokom gusto\u0107om piksela (Hi-DPI) nema problema s prikazom fontova kada se koriste metode hintinga osim «hintfull».<\/p>\n

Odgovor<\/a><\/noindex> programera HarfBuzz (Behdad Esfahbod) iz odgovaraju\u0107e rasprave o problemu:<\/p>\n

\n

Poku\u0161avao sam koristiti stilove hintinga razli\u010dite od hintfull, ali samo on daje prikaz fontova blizak ClearType v2 u Windows 7, koji, po mom mi\u0161ljenju, ima najbolji rendering od svih postoje\u0107ih rje\u0161enja.<\/i><\/p>\n

To\u010dno. Zato smo odlu\u010dili da ga vi\u0161e ne podr\u017eavamo. Mo\u017eete poku\u0161ati naviknuti se na «mutni» prikaz ili potra\u017eiti ne\u0161to drugo. Koristite Open Source, zar ne?<\/p><\/blockquote>\n<\/blockquote>\n

Dodatak nakon daljnje rasprave: <\/p>\n

U sljede\u0107im komentarima programer objasnio<\/a><\/noindex>, da otvoreni softver omogu\u0107ava izbor i da oni koji nisu zadovoljni trenutnim stanjem mogu stvoriti fork Pango. Programeri HarfBuzz ne mogu utjecati na njegov odr\u017eavanje i odluke koje se u njemu donose. Behdad Esfahbod, trenutni odr\u017eavatelj HarfBuzz, koji se nalazi na prvom mjestu po broju commitova u oba<\/a><\/noindex>
\nprojekta,<\/a><\/noindex>spomenuo je da vi\u0161e od 10 godina nije povezan s Red Hatom i da nije odr\u017eavatelj Pango. Od 2010. godine pre\u0161ao je u Google i sada se bavi samo HarfBuzz, koji je ranije bio njegov osobni projekt. HarfBuzz ne kontrolira<\/a><\/noindex> proces renderiranja i Pango mo\u017ee redefinirati zatra\u017eene metode hintinga na svojoj strani. <\/p>\n

Drugi programer HarfBuzz naglasio je<\/a><\/noindex>, da je problem na strani Pango, jer HarfBuzz nije sustav za renderiranje fontova i ne podr\u017eava hinting prema svojoj arhitekturi. Ako Pango zahtijeva o\u010duvanje hintinga, tada prelazak na HarfBuzz nije taj izbor koji mo\u017ee o\u010dekivati njegovu podr\u0161ku. U kvaliteti<\/a><\/noindex> Razlozi za odbijanje implementacije hintanja u HarfBuzz navode da neki na\u010dini hintanja dovode do promjene izvorne \u0161irine glyfa, a ta promjena ovisi o veli\u010dini piksela. Prije je Pango izvodio sli\u010dne operacije preko FreeType-a, koji podr\u017eava hintanje, ali je zatim pre\u0161ao na HarfBuzz, koji osigurava obradu glyfa bez vezivanja uz njihovu veli\u010dinu. Stoga rje\u0161enje problema nastalih kori\u0161tenjem Pango le\u017ei pod odgovorno\u0161\u0107u Pango, a ne HarfBuzz.<\/p>\n

Na kraju Behdad Esfahbod je objavio<\/a><\/noindex> veliki retrospektivni osvrt na razvoj font stogova u Linuxu. Nakon njegovog odlaska u Google, biblioteke Pango i Cairo su prakti\u010dno zapostavljene i u\u0161le u stagnaciju. U HarfBuzz-u, rad je fokusiran na podr\u0161ku adaptivnim varijantnim fontovima, dok je Red Hat usmjerio svoju pa\u017enju na GTK i Glib. Tijekom vremena, doprinosi od varijantnih fontova preba\u010deni su u FreeType, fontconfig i Cairo, ali su ostali nedovr\u0161eni u Pango zbog nedostatka programera. Pristup novim API-jevima u Pango bio je omogu\u0107en kroz apstrakciju FontMap i podr\u017ean samo za FreeType podr\u017eane backendove. Backendovi za Windows i macOS su vi\u0161e od 10 godina bez podr\u0161ke. <\/p>\n

Nakon \u0161irenja mobilnih ure\u0111aja i preglednika, Microsoft je u Windows 8 prestao podr\u017eavati subpikselnu obradu fontova i renderiranje u GDI stilu. macOS je oduvijek podr\u017eavao renderiranje koje se u ovoj raspravi naziva «mutnim». Od 2018. godine nekoliko programera iz HarfBuzz poku\u0161alo je prenijeti mogu\u0107nosti dodane tijekom posljednjih godina u HarfBuzz u Pango. Paralelno je tijekom razvoja GTK4 izvr\u0161en prijelaz na renderiranje temeljeno na OpenGL-u, \u0161to podrazumijeva linearno skaliranje teksta, \u010dime je poja\u010dano suprotstavljanje izme\u0111u pikselnog renderiranja i skalabilnog rasporeda.<\/p>\n

LibreOffice, Chrome i Firefox pre\u0161li su na kori\u0161tenje HarfBuzz-a kao jedinstvenog shaping engine-a, na ra\u010dun prekida podr\u0161ke za rasterske fontove i Type1 format. Onima kojima su potrebni rasterski fontovi, predlo\u017eeno je da ih pretvore u OpenType kontejner. U Adobeu je poslan zahtjev za implementaciju Type1 za HarfBuzz, ali su odgovorili da to nema smisla, jer sami prestaju s podr\u0161kom za Type1 ove godine. <\/p>\n

Kako bi sustigla izvanredne tehnologije, sli\u010dna odluka o prijelazu na HarfBuzz donesena je i za biblioteku Pango. Cijena je bila prekid podr\u0161ke za neke stare tehnologije stare 20 godina. Uvijek se navodi da, s obzirom na ograni\u010dene resurse, razvija\u010dima nedostaje ruku za sve, a oni zainteresirani za o\u010duvanje starih tehnologija mogli bi poku\u0161ati prona\u0107i nekoga tko bi bio spreman odr\u017eavati nedostatnu funkcionalnost. Kao primjer se navodi GNOME3, nakon \u010dijeg su se pojavljivanja nezadovoljni mogli nastaviti razvijati zastarjele tehnologije GNOME2 u okviru projekata Mate i Cinnamon. Isto vrijedi i za Pango, ali zasad nije bilo zainteresiranih.<\/p>\n

<\/a><\/noindex><\/p>\n

Izvor: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0441\u0433\u043b\u0430\u0436\u0438\u0432\u0430\u043d\u0438\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":81073,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-81072","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Razvija\u010di stoga fontova Linux odrekli su se podr\u0161ke za meko antialiasing | ProHoster","description":"Neki korisnici koji koriste metodu hintinga \"hintfull\" mogli su primijetiti da prilikom prijelaza s verzije Pango 1.43 na 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