{"id":74805,"date":"2020-03-20T20:42:28","date_gmt":"2020-03-20T17:42:28","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/ttf-parser-0-5-novaya-biblioteka-dlya-raboty-s-truetype-shriftami"},"modified":"2020-03-20T20:42:28","modified_gmt":"2020-03-20T17:42:28","slug":"ttf-parser-0-5-novaya-biblioteka-dlya-raboty-s-truetype-shriftami","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/ttf-parser-0-5-novaya-biblioteka-dlya-raboty-s-truetype-shriftami","title":{"rendered":"ttf-parser 0.5 \u2014 nuova libreria per lavorare con font TrueType","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

<\/p>\n

ttf-parser<\/a> — \u00e8 una libreria per l'analisi di caratteri TrueType\/OpenType.<\/noindex>
\nNella nuova versione \u00e8 stata introdotta il supporto completo per font variabili
\n(font variabili<\/a>) e C API, perci\u00f2 ho deciso di pubblicizzarla su l'ora.<\/p>\n

Fino a poco tempo fa, se era necessaria l'elaborazione di font TrueType, c'erano esattamente due opzioni: FreeType e stb_truetype. Il primo \u00e8 un enorme motore, il secondo supporta un numero piuttosto limitato di funzioni.<\/p>\n

ttf-parser \u00e8 a met\u00e0 strada. Supporta tutte le stesse tabelle TrueType (il formato TrueType \u00e8 composto da molte tabelle binarie separate) come FreeType, ma non gestisce il rendering dei glyph.<\/p>\n

Tuttavia, ttf-parser presenta molte altre differenze significative:<\/p>\n

    \n
  1. ttf-parser \u00e8 scritto in Rust senza utilizzare unsafe. FreeType e stb_truetype sono scritti in C.<\/li>\n
  2. ttf-parser \u00e8 l'unica implementazione sicura (memory-safe). La lettura di memoria arbitraria \u00e8 impossibile. In FreeType le vulnerabilit\u00e0 vengono continuamente corrette, mentre stb_truetype non \u00e8 progettato per la lettura di font arbitrari.<\/li>\n
  3. ttf-parser \u00e8 l'unica implementazione thread-safe. Tutti i metodi di analisi sono costanti. L'unica eccezione \u00e8 la definizione delle coordinate per i caratteri variabili, ma questa funzionalit\u00e0 \u00e8 reentrante. FreeType \u00e8 generalmente single-threaded. stb_truetype — reentrante (pu\u00f2 essere utilizzato con copie separate in diversi thread, ma non una delle molteplici).<\/li>\n
  4. ttf-parser \u00e8 l'unica implementazione che non utilizza allocazione in «heap». Ci\u00f2 consente di accelerare l'analisi e di evitare problemi in caso di OOM.<\/li>\n
  5. Inoltre, quasi tutte le operazioni aritmetiche e la conversione dei tipi numerici vengono verificate (anche staticamente).<\/li>\n
  6. Nel peggior caso, la libreria pu\u00f2 sollevare un'eccezione. Tuttavia, nell'API C le eccezioni verranno intercettate e la funzione restituisce un errore, senza chiudersi.<\/li>\n<\/ol>\n

    <\/p>\n

    E nonostante tutte le garanzie di sicurezza, ttf-parser \u00e8 anche l'implementazione pi\u00f9 veloce. Ad esempio, l'analisi di CFF2 \u00e8 3.5 volte pi\u00f9 veloce rispetto a FreeType. L'analisi di glyf \u00e8 nel frattempo il 10% pi\u00f9 lenta rispetto a stb_truetype, ma questo \u00e8 dovuto al fatto che non supporta font variabili, per i quali \u00e8 necessario memorizzare informazioni aggiuntive. Maggiori dettagli in README<\/a>.<\/p>\n

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

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

    ttf-parser — \u044d\u0442\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u0434\u043b\u044f \u0440\u0430\u0437\u0431\u043e\u0440\u0430 TrueType\/OpenType \u0448\u0440\u0438\u0444\u0442\u043e\u0432. \u0412 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u043f\u043e\u044f\u0432\u0438\u043b\u0430\u0441\u044c \u043f\u043e\u043b\u043d\u043e\u0446\u0435\u043d\u043d\u0430\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u0448\u0440\u0438\u0444\u0442\u043e\u0432 (variable fonts) \u0438 C API, \u0432\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u0435 \u0447\u0435\u0433\u043e \u044f \u0440\u0435\u0448\u0438\u043b \u043f\u0440\u043e\u0440\u0435\u043a\u043b\u0430\u043c\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0435\u0451 \u043d\u0430 \u043b\u043e\u0440\u0435. \u0414\u043e \u043d\u0435\u0434\u0430\u0432\u043d\u0435\u0433\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0438, \u0435\u0441\u043b\u0438 \u0431\u044b\u043b\u0430 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0441\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u044b \u0441 TrueType \u0448\u0440\u0438\u0444\u0442\u0430\u043c\u0438, \u0431\u044b\u043b\u043e \u0440\u043e\u0432\u043d\u043e \u0434\u0432\u0430 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0430: FreeType \u0438 stb_truetype. \u041f\u0435\u0440\u0432\u044b\u0439 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043e\u0433\u0440\u043e\u043c\u043d\u044b\u043c \u043a\u043e\u043c\u0431\u0430\u0439\u043d\u043e\u043c, \u0432\u0442\u043e\u0440\u043e\u0439 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u0442 \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-74805","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47ttf-parser 0.5 \u2014 nuova libreria per lavorare con font TrueType | ProHoster","description":"ttf-parser \u00e8 una libreria per l'analisi dei font TrueType\/OpenType. 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