🛠️🐜 Antkeeper superbuild with dependencies included https://antkeeper.com
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  6. <meta name="description" content="API Reference Documentation for FreeType-2.11.0">
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  10. <title>LZW Streams - FreeType-2.11.0 API Reference</title>
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  19. <body dir="ltr" data-md-color-scheme="" data-md-color-primary="green" data-md-color-accent="green">
  20. <script>function __prefix(e){return new URL(".",location).pathname+"."+e}function __get(e,t=localStorage){return JSON.parse(t.getItem(__prefix(e)))}</script>
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  23. <label class="md-overlay" for="__drawer"></label>
  24. <div data-md-component="skip">
  25. <a href="#lzw-streams" class="md-skip">
  26. Skip to content
  27. </a>
  28. </div>
  29. <div data-md-component="announce">
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  31. <header class="md-header" data-md-component="header">
  32. <nav class="md-header__inner md-grid" aria-label="Header">
  33. <a href="index.html" title="FreeType-2.11.0 API Reference" class="md-header__button md-logo" aria-label="FreeType-2.11.0 API Reference" data-md-component="logo">
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  39. <div class="md-header__title" data-md-component="header-title">
  40. <div class="md-header__ellipsis">
  41. <div class="md-header__topic">
  42. <span class="md-ellipsis">
  43. FreeType-2.11.0 API Reference
  44. </span>
  45. </div>
  46. <div class="md-header__topic" data-md-component="header-topic">
  47. <span class="md-ellipsis">
  48. LZW Streams
  49. </span>
  50. </div>
  51. </div>
  52. </div>
  53. <label class="md-header__button md-icon" for="__search">
  54. <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5z"/></svg>
  55. </label>
  56. <div class="md-search" data-md-component="search" role="dialog">
  57. <label class="md-search__overlay" for="__search"></label>
  58. <div class="md-search__inner" role="search">
  59. <form class="md-search__form" name="search">
  60. <input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" data-md-state="active" required>
  61. <label class="md-search__icon md-icon" for="__search">
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  69. <div class="md-search__output">
  70. <div class="md-search__scrollwrap" data-md-scrollfix>
  71. <div class="md-search-result" data-md-component="search-result">
  72. <div class="md-search-result__meta">
  73. Initializing search
  74. </div>
  75. <ol class="md-search-result__list"></ol>
  76. </div>
  77. </div>
  78. </div>
  79. </div>
  80. </div>
  81. </nav>
  82. </header>
  83. <div class="md-container" data-md-component="container">
  84. <main class="md-main" data-md-component="main">
  85. <div class="md-main__inner md-grid">
  86. <div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
  87. <div class="md-sidebar__scrollwrap">
  88. <div class="md-sidebar__inner">
  89. <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
  90. <label class="md-nav__title" for="__drawer">
  91. <a href="index.html" title="FreeType-2.11.0 API Reference" class="md-nav__button md-logo" aria-label="FreeType-2.11.0 API Reference" data-md-component="logo">
  92. <img src="images/favico.ico" alt="logo">
  93. </a>
  94. FreeType-2.11.0 API Reference
  95. </label>
  96. <ul class="md-nav__list" data-md-scrollfix>
  97. <li class="md-nav__item">
  98. <a href="index.html" class="md-nav__link">
  99. TOC
  100. </a>
  101. </li>
  102. <li class="md-nav__item">
  103. <a href="ft2-index.html" class="md-nav__link">
  104. Index
  105. </a>
  106. </li>
  107. <li class="md-nav__item md-nav__item--nested">
  108. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3" type="checkbox" id="__nav_3" >
  109. <label class="md-nav__link" for="__nav_3">
  110. General Remarks
  111. <span class="md-nav__icon md-icon"></span>
  112. </label>
  113. <nav class="md-nav" aria-label="General Remarks" data-md-level="1">
  114. <label class="md-nav__title" for="__nav_3">
  115. <span class="md-nav__icon md-icon"></span>
  116. General Remarks
  117. </label>
  118. <ul class="md-nav__list" data-md-scrollfix>
  119. <li class="md-nav__item">
  120. <a href="ft2-preamble.html" class="md-nav__link">
  121. Preamble
  122. </a>
  123. </li>
  124. <li class="md-nav__item">
  125. <a href="ft2-header_inclusion.html" class="md-nav__link">
  126. FreeType's header inclusion scheme
  127. </a>
  128. </li>
  129. <li class="md-nav__item">
  130. <a href="ft2-user_allocation.html" class="md-nav__link">
  131. User allocation
  132. </a>
  133. </li>
  134. </ul>
  135. </nav>
  136. </li>
  137. <li class="md-nav__item md-nav__item--nested">
  138. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_4" type="checkbox" id="__nav_4" >
  139. <label class="md-nav__link" for="__nav_4">
  140. Core API
  141. <span class="md-nav__icon md-icon"></span>
  142. </label>
  143. <nav class="md-nav" aria-label="Core API" data-md-level="1">
  144. <label class="md-nav__title" for="__nav_4">
  145. <span class="md-nav__icon md-icon"></span>
  146. Core API
  147. </label>
  148. <ul class="md-nav__list" data-md-scrollfix>
  149. <li class="md-nav__item">
  150. <a href="ft2-version.html" class="md-nav__link">
  151. FreeType Version
  152. </a>
  153. </li>
  154. <li class="md-nav__item">
  155. <a href="ft2-basic_types.html" class="md-nav__link">
  156. Basic Data Types
  157. </a>
  158. </li>
  159. <li class="md-nav__item">
  160. <a href="ft2-base_interface.html" class="md-nav__link">
  161. Base Interface
  162. </a>
  163. </li>
  164. <li class="md-nav__item">
  165. <a href="ft2-glyph_variants.html" class="md-nav__link">
  166. Unicode Variation Sequences
  167. </a>
  168. </li>
  169. <li class="md-nav__item">
  170. <a href="ft2-color_management.html" class="md-nav__link">
  171. Glyph Color Management
  172. </a>
  173. </li>
  174. <li class="md-nav__item">
  175. <a href="ft2-layer_management.html" class="md-nav__link">
  176. Glyph Layer Management
  177. </a>
  178. </li>
  179. <li class="md-nav__item">
  180. <a href="ft2-glyph_management.html" class="md-nav__link">
  181. Glyph Management
  182. </a>
  183. </li>
  184. <li class="md-nav__item">
  185. <a href="ft2-mac_specific.html" class="md-nav__link">
  186. Mac Specific Interface
  187. </a>
  188. </li>
  189. <li class="md-nav__item">
  190. <a href="ft2-sizes_management.html" class="md-nav__link">
  191. Size Management
  192. </a>
  193. </li>
  194. <li class="md-nav__item">
  195. <a href="ft2-header_file_macros.html" class="md-nav__link">
  196. Header File Macros
  197. </a>
  198. </li>
  199. </ul>
  200. </nav>
  201. </li>
  202. <li class="md-nav__item md-nav__item--nested">
  203. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_5" type="checkbox" id="__nav_5" >
  204. <label class="md-nav__link" for="__nav_5">
  205. Format-Specific API
  206. <span class="md-nav__icon md-icon"></span>
  207. </label>
  208. <nav class="md-nav" aria-label="Format-Specific API" data-md-level="1">
  209. <label class="md-nav__title" for="__nav_5">
  210. <span class="md-nav__icon md-icon"></span>
  211. Format-Specific API
  212. </label>
  213. <ul class="md-nav__list" data-md-scrollfix>
  214. <li class="md-nav__item">
  215. <a href="ft2-multiple_masters.html" class="md-nav__link">
  216. Multiple Masters
  217. </a>
  218. </li>
  219. <li class="md-nav__item">
  220. <a href="ft2-truetype_tables.html" class="md-nav__link">
  221. TrueType Tables
  222. </a>
  223. </li>
  224. <li class="md-nav__item">
  225. <a href="ft2-type1_tables.html" class="md-nav__link">
  226. Type 1 Tables
  227. </a>
  228. </li>
  229. <li class="md-nav__item">
  230. <a href="ft2-sfnt_names.html" class="md-nav__link">
  231. SFNT Names
  232. </a>
  233. </li>
  234. <li class="md-nav__item">
  235. <a href="ft2-bdf_fonts.html" class="md-nav__link">
  236. BDF and PCF Files
  237. </a>
  238. </li>
  239. <li class="md-nav__item">
  240. <a href="ft2-cid_fonts.html" class="md-nav__link">
  241. CID Fonts
  242. </a>
  243. </li>
  244. <li class="md-nav__item">
  245. <a href="ft2-pfr_fonts.html" class="md-nav__link">
  246. PFR Fonts
  247. </a>
  248. </li>
  249. <li class="md-nav__item">
  250. <a href="ft2-winfnt_fonts.html" class="md-nav__link">
  251. Window FNT Files
  252. </a>
  253. </li>
  254. <li class="md-nav__item">
  255. <a href="ft2-font_formats.html" class="md-nav__link">
  256. Font Formats
  257. </a>
  258. </li>
  259. <li class="md-nav__item">
  260. <a href="ft2-gasp_table.html" class="md-nav__link">
  261. Gasp Table
  262. </a>
  263. </li>
  264. </ul>
  265. </nav>
  266. </li>
  267. <li class="md-nav__item md-nav__item--nested">
  268. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_6" type="checkbox" id="__nav_6" >
  269. <label class="md-nav__link" for="__nav_6">
  270. Controlling FreeType Modules
  271. <span class="md-nav__icon md-icon"></span>
  272. </label>
  273. <nav class="md-nav" aria-label="Controlling FreeType Modules" data-md-level="1">
  274. <label class="md-nav__title" for="__nav_6">
  275. <span class="md-nav__icon md-icon"></span>
  276. Controlling FreeType Modules
  277. </label>
  278. <ul class="md-nav__list" data-md-scrollfix>
  279. <li class="md-nav__item">
  280. <a href="ft2-auto_hinter.html" class="md-nav__link">
  281. The auto-hinter
  282. </a>
  283. </li>
  284. <li class="md-nav__item">
  285. <a href="ft2-cff_driver.html" class="md-nav__link">
  286. The CFF driver
  287. </a>
  288. </li>
  289. <li class="md-nav__item">
  290. <a href="ft2-t1_cid_driver.html" class="md-nav__link">
  291. The Type 1 and CID drivers
  292. </a>
  293. </li>
  294. <li class="md-nav__item">
  295. <a href="ft2-tt_driver.html" class="md-nav__link">
  296. The TrueType driver
  297. </a>
  298. </li>
  299. <li class="md-nav__item">
  300. <a href="ft2-pcf_driver.html" class="md-nav__link">
  301. The PCF driver
  302. </a>
  303. </li>
  304. <li class="md-nav__item">
  305. <a href="ft2-properties.html" class="md-nav__link">
  306. Driver properties
  307. </a>
  308. </li>
  309. <li class="md-nav__item">
  310. <a href="ft2-parameter_tags.html" class="md-nav__link">
  311. Parameter Tags
  312. </a>
  313. </li>
  314. <li class="md-nav__item">
  315. <a href="ft2-lcd_rendering.html" class="md-nav__link">
  316. Subpixel Rendering
  317. </a>
  318. </li>
  319. </ul>
  320. </nav>
  321. </li>
  322. <li class="md-nav__item md-nav__item--nested">
  323. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7" type="checkbox" id="__nav_7" >
  324. <label class="md-nav__link" for="__nav_7">
  325. Cache Sub-System
  326. <span class="md-nav__icon md-icon"></span>
  327. </label>
  328. <nav class="md-nav" aria-label="Cache Sub-System" data-md-level="1">
  329. <label class="md-nav__title" for="__nav_7">
  330. <span class="md-nav__icon md-icon"></span>
  331. Cache Sub-System
  332. </label>
  333. <ul class="md-nav__list" data-md-scrollfix>
  334. <li class="md-nav__item">
  335. <a href="ft2-cache_subsystem.html" class="md-nav__link">
  336. Cache Sub-System
  337. </a>
  338. </li>
  339. </ul>
  340. </nav>
  341. </li>
  342. <li class="md-nav__item md-nav__item--active md-nav__item--nested">
  343. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_8" type="checkbox" id="__nav_8" checked>
  344. <label class="md-nav__link" for="__nav_8">
  345. Support API
  346. <span class="md-nav__icon md-icon"></span>
  347. </label>
  348. <nav class="md-nav" aria-label="Support API" data-md-level="1">
  349. <label class="md-nav__title" for="__nav_8">
  350. <span class="md-nav__icon md-icon"></span>
  351. Support API
  352. </label>
  353. <ul class="md-nav__list" data-md-scrollfix>
  354. <li class="md-nav__item">
  355. <a href="ft2-computations.html" class="md-nav__link">
  356. Computations
  357. </a>
  358. </li>
  359. <li class="md-nav__item">
  360. <a href="ft2-list_processing.html" class="md-nav__link">
  361. List Processing
  362. </a>
  363. </li>
  364. <li class="md-nav__item">
  365. <a href="ft2-outline_processing.html" class="md-nav__link">
  366. Outline Processing
  367. </a>
  368. </li>
  369. <li class="md-nav__item">
  370. <a href="ft2-quick_advance.html" class="md-nav__link">
  371. Quick retrieval of advance values
  372. </a>
  373. </li>
  374. <li class="md-nav__item">
  375. <a href="ft2-bitmap_handling.html" class="md-nav__link">
  376. Bitmap Handling
  377. </a>
  378. </li>
  379. <li class="md-nav__item">
  380. <a href="ft2-raster.html" class="md-nav__link">
  381. Scanline Converter
  382. </a>
  383. </li>
  384. <li class="md-nav__item">
  385. <a href="ft2-glyph_stroker.html" class="md-nav__link">
  386. Glyph Stroker
  387. </a>
  388. </li>
  389. <li class="md-nav__item">
  390. <a href="ft2-system_interface.html" class="md-nav__link">
  391. System Interface
  392. </a>
  393. </li>
  394. <li class="md-nav__item">
  395. <a href="ft2-module_management.html" class="md-nav__link">
  396. Module Management
  397. </a>
  398. </li>
  399. <li class="md-nav__item">
  400. <a href="ft2-gzip.html" class="md-nav__link">
  401. GZIP Streams
  402. </a>
  403. </li>
  404. <li class="md-nav__item md-nav__item--active">
  405. <input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc">
  406. <label class="md-nav__link md-nav__link--active" for="__toc">
  407. LZW Streams
  408. <span class="md-nav__icon md-icon"></span>
  409. </label>
  410. <a href="ft2-lzw.html" class="md-nav__link md-nav__link--active">
  411. LZW Streams
  412. </a>
  413. <nav class="md-nav md-nav--secondary" aria-label="Table of contents">
  414. <label class="md-nav__title" for="__toc">
  415. <span class="md-nav__icon md-icon"></span>
  416. Table of contents
  417. </label>
  418. <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
  419. <li class="md-nav__item">
  420. <a href="#synopsis" class="md-nav__link">
  421. Synopsis
  422. </a>
  423. </li>
  424. <li class="md-nav__item">
  425. <a href="#ft_stream_openlzw" class="md-nav__link">
  426. FT_Stream_OpenLZW
  427. </a>
  428. </li>
  429. </ul>
  430. </nav>
  431. </li>
  432. <li class="md-nav__item">
  433. <a href="ft2-bzip2.html" class="md-nav__link">
  434. BZIP2 Streams
  435. </a>
  436. </li>
  437. <li class="md-nav__item">
  438. <a href="ft2-debugging_apis.html" class="md-nav__link">
  439. External Debugging APIs
  440. </a>
  441. </li>
  442. </ul>
  443. </nav>
  444. </li>
  445. <li class="md-nav__item md-nav__item--nested">
  446. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_9" type="checkbox" id="__nav_9" >
  447. <label class="md-nav__link" for="__nav_9">
  448. Error Codes
  449. <span class="md-nav__icon md-icon"></span>
  450. </label>
  451. <nav class="md-nav" aria-label="Error Codes" data-md-level="1">
  452. <label class="md-nav__title" for="__nav_9">
  453. <span class="md-nav__icon md-icon"></span>
  454. Error Codes
  455. </label>
  456. <ul class="md-nav__list" data-md-scrollfix>
  457. <li class="md-nav__item">
  458. <a href="ft2-error_enumerations.html" class="md-nav__link">
  459. Error Enumerations
  460. </a>
  461. </li>
  462. <li class="md-nav__item">
  463. <a href="ft2-error_code_values.html" class="md-nav__link">
  464. Error Code Values
  465. </a>
  466. </li>
  467. </ul>
  468. </nav>
  469. </li>
  470. <li class="md-nav__item md-nav__item--nested">
  471. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_10" type="checkbox" id="__nav_10" >
  472. <label class="md-nav__link" for="__nav_10">
  473. Miscellaneous
  474. <span class="md-nav__icon md-icon"></span>
  475. </label>
  476. <nav class="md-nav" aria-label="Miscellaneous" data-md-level="1">
  477. <label class="md-nav__title" for="__nav_10">
  478. <span class="md-nav__icon md-icon"></span>
  479. Miscellaneous
  480. </label>
  481. <ul class="md-nav__list" data-md-scrollfix>
  482. <li class="md-nav__item">
  483. <a href="ft2-gx_validation.html" class="md-nav__link">
  484. TrueTypeGX/AAT Validation
  485. </a>
  486. </li>
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  521. Synopsis
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  525. <a href="#ft_stream_openlzw" class="md-nav__link">
  526. FT_Stream_OpenLZW
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  536. <p><a href="https://www.freetype.org">FreeType</a> &raquo; <a href="../">Docs</a> &raquo; <a href="index.html#support-api">Support API</a> &raquo; LZW Streams</p>
  537. <hr />
  538. <h1 id="lzw-streams">LZW Streams<a class="headerlink" href="#lzw-streams" title="Permanent link">&para;</a></h1>
  539. <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">&para;</a></h2>
  540. <p>In certain builds of the library, LZW compression recognition is automatically handled when calling <code><a href="ft2-base_interface.html#ft_new_face">FT_New_Face</a></code> or <code><a href="ft2-base_interface.html#ft_open_face">FT_Open_Face</a></code>. This means that if no font driver is capable of handling the raw compressed file, the library will try to open a LZW stream from it and re-open the face with it.</p>
  541. <p>The stream implementation is very basic and resets the decompression process each time seeking backwards is needed within the stream, which significantly undermines the performance.</p>
  542. <p>This section contains the declaration of LZW-specific functions.</p>
  543. <h2 id="ft_stream_openlzw">FT_Stream_OpenLZW<a class="headerlink" href="#ft_stream_openlzw" title="Permanent link">&para;</a></h2>
  544. <p>Defined in FT_LZW_H (freetype/ftlzw.h).</p>
  545. <div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
  546. <b>FT_Stream_OpenLZW</b>( <a href="ft2-system_interface.html#ft_stream">FT_Stream</a> stream,
  547. <a href="ft2-system_interface.html#ft_stream">FT_Stream</a> source );
  548. </code></pre></div>
  549. <p>Open a new stream to parse LZW-compressed font files. This is mainly used to support the compressed <code>*.pcf.Z</code> fonts that come with XFree86.</p>
  550. <h4>input</h4>
  551. <table class="fields">
  552. <tr><td class="val" id="stream">stream</td><td class="desc">
  553. <p>The target embedding stream.</p>
  554. </td></tr>
  555. <tr><td class="val" id="source">source</td><td class="desc">
  556. <p>The source stream.</p>
  557. </td></tr>
  558. </table>
  559. <h4>return</h4>
  560. <p>FreeType error code. 0&nbsp;means success.</p>
  561. <h4>note</h4>
  562. <p>The source stream must be opened <em>before</em> calling this function.</p>
  563. <p>Calling the internal function <code>FT_Stream_Close</code> on the new stream will <strong>not</strong> call <code>FT_Stream_Close</code> on the source stream. None of the stream objects will be released to the heap.</p>
  564. <p>This function may return <code>FT_Err_Unimplemented_Feature</code> if your build of FreeType was not compiled with LZW support.</p>
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