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class="md-nav__link"> + Quick retrieval of advance values + </a> + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-bitmap_handling.html" title="Bitmap Handling" class="md-nav__link"> + Bitmap Handling + </a> + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-raster.html" title="Scanline Converter" class="md-nav__link"> + Scanline Converter + </a> + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-glyph_stroker.html" title="Glyph Stroker" class="md-nav__link"> + Glyph Stroker + </a> + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-system_interface.html" title="System Interface" class="md-nav__link"> + System Interface + </a> + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-module_management.html" title="Module Management" class="md-nav__link"> + Module Management + </a> + </li> + + + + + + + + + + <li class="md-nav__item md-nav__item--active"> + + <input class="md-toggle md-nav__toggle" data-md-toggle="toc" type="checkbox" id="__toc"> + + + + + <label class="md-nav__link md-nav__link--active" for="__toc"> + GZIP Streams + </label> + + <a href="ft2-gzip.html" title="GZIP Streams" class="md-nav__link md-nav__link--active"> + GZIP Streams + </a> + + +<nav class="md-nav md-nav--secondary"> + + + + + + <label class="md-nav__title" for="__toc">Table of contents</label> + <ul class="md-nav__list" data-md-scrollfix> + + <li class="md-nav__item"> + <a href="#synopsis" class="md-nav__link"> + Synopsis + </a> + +</li> + + <li class="md-nav__item"> + <a href="#ft_stream_opengzip" class="md-nav__link"> + FT_Stream_OpenGzip + </a> + +</li> + + <li class="md-nav__item"> + <a href="#ft_gzip_uncompress" class="md-nav__link"> + FT_Gzip_Uncompress + </a> + +</li> + + + + + + </ul> + +</nav> + + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-lzw.html" title="LZW Streams" class="md-nav__link"> + LZW Streams + </a> + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-bzip2.html" title="BZIP2 Streams" class="md-nav__link"> + BZIP2 Streams + </a> + </li> + + + </ul> + </nav> + </li> + + + + + + + + <li class="md-nav__item md-nav__item--nested"> + + <input class="md-toggle md-nav__toggle" data-md-toggle="nav-9" type="checkbox" id="nav-9"> + + <label class="md-nav__link" for="nav-9"> + Error Codes + </label> + <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> + <label class="md-nav__title" for="nav-9"> + Error Codes + </label> + <ul class="md-nav__list" data-md-scrollfix> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-error_enumerations.html" title="Error Enumerations" class="md-nav__link"> + Error Enumerations + </a> + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-error_code_values.html" title="Error Code Values" class="md-nav__link"> + Error Code Values + </a> + </li> + + + </ul> + </nav> + </li> + + + + + + + + <li class="md-nav__item md-nav__item--nested"> + + <input class="md-toggle md-nav__toggle" data-md-toggle="nav-10" type="checkbox" id="nav-10"> + + <label class="md-nav__link" for="nav-10"> + Miscellaneous + </label> + <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> + <label class="md-nav__title" for="nav-10"> + Miscellaneous + </label> + <ul class="md-nav__list" data-md-scrollfix> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-gx_validation.html" title="TrueTypeGX/AAT Validation" class="md-nav__link"> + TrueTypeGX/AAT Validation + </a> + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-incremental.html" title="Incremental Loading" class="md-nav__link"> + Incremental Loading + </a> + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-truetype_engine.html" title="The TrueType Engine" class="md-nav__link"> + The TrueType Engine + </a> + </li> + + + + + + + + <li class="md-nav__item"> + <a href="ft2-ot_validation.html" title="OpenType Validation" class="md-nav__link"> + OpenType Validation + </a> + </li> + + + </ul> + </nav> + </li> + + + </ul> +</nav> + </div> + </div> + </div> + + + <div class="md-sidebar md-sidebar--secondary" data-md-component="toc"> + <div class="md-sidebar__scrollwrap"> + <div class="md-sidebar__inner"> + +<nav class="md-nav md-nav--secondary"> + + + + + + <label class="md-nav__title" for="__toc">Table of contents</label> + <ul class="md-nav__list" data-md-scrollfix> + + <li class="md-nav__item"> + <a href="#synopsis" class="md-nav__link"> + Synopsis + </a> + +</li> + + <li class="md-nav__item"> + <a href="#ft_stream_opengzip" class="md-nav__link"> + FT_Stream_OpenGzip + </a> + +</li> + + <li class="md-nav__item"> + <a href="#ft_gzip_uncompress" class="md-nav__link"> + FT_Gzip_Uncompress + </a> + +</li> + + + + + + </ul> + +</nav> + </div> + </div> + </div> + + + <div class="md-content"> + <article class="md-content__inner md-typeset"> + + + + <p><a href="https://www.freetype.org">FreeType</a> » <a href="../">Docs</a> » <a href="index.html#support-api">Support API</a> » GZIP Streams</p> +<hr /> +<h1 id="gzip-streams">GZIP Streams<a class="headerlink" href="#gzip-streams" title="Permanent link">¶</a></h1> +<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2> +<p>In certain builds of the library, gzip 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 gzipped stream from it and re-open the face with it.</p> +<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> +<p>This section contains the declaration of Gzip-specific functions.</p> +<h2 id="ft_stream_opengzip">FT_Stream_OpenGzip<a class="headerlink" href="#ft_stream_opengzip" title="Permanent link">¶</a></h2> +<p>Defined in FT_GZIP_H (freetype/ftgzip.h).</p> +<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> ) + <b>FT_Stream_OpenGzip</b>( <a href="ft2-system_interface.html#ft_stream">FT_Stream</a> stream, + <a href="ft2-system_interface.html#ft_stream">FT_Stream</a> source ); +</code></pre></div> + +<p>Open a new stream to parse gzip-compressed font files. This is mainly used to support the compressed <code>*.pcf.gz</code> fonts that come with XFree86.</p> +<h4>input</h4> + +<table class="fields"> +<tr><td class="val" id="stream">stream</td><td class="desc"> +<p>The target embedding stream.</p> +</td></tr> +<tr><td class="val" id="source">source</td><td class="desc"> +<p>The source stream.</p> +</td></tr> +</table> + +<h4>return</h4> + +<p>FreeType error code. 0 means success.</p> +<h4>note</h4> + +<p>The source stream must be opened <em>before</em> calling this function.</p> +<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> +<p>This function may return <code>FT_Err_Unimplemented_Feature</code> if your build of FreeType was not compiled with zlib support.</p> +<hr> + +<h2 id="ft_gzip_uncompress">FT_Gzip_Uncompress<a class="headerlink" href="#ft_gzip_uncompress" title="Permanent link">¶</a></h2> +<p>Defined in FT_GZIP_H (freetype/ftgzip.h).</p> +<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> ) + <b>FT_Gzip_Uncompress</b>( <a href="ft2-system_interface.html#ft_memory">FT_Memory</a> memory, + <a href="ft2-basic_types.html#ft_byte">FT_Byte</a>* output, + <a href="ft2-basic_types.html#ft_ulong">FT_ULong</a>* output_len, + <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_byte">FT_Byte</a>* input, + <a href="ft2-basic_types.html#ft_ulong">FT_ULong</a> input_len ); +</code></pre></div> + +<p>Decompress a zipped input buffer into an output buffer. This function is modeled after zlib's <code>uncompress</code> function.</p> +<h4>input</h4> + +<table class="fields"> +<tr><td class="val" id="memory">memory</td><td class="desc"> +<p>A FreeType memory handle.</p> +</td></tr> +<tr><td class="val" id="input">input</td><td class="desc"> +<p>The input buffer.</p> +</td></tr> +<tr><td class="val" id="input_len">input_len</td><td class="desc"> +<p>The length of the input buffer.</p> +</td></tr> +</table> + +<h4>output</h4> + +<table class="fields"> +<tr><td class="val" id="output">output</td><td class="desc"> +<p>The output buffer.</p> +</td></tr> +</table> + +<h4>inout</h4> + +<table class="fields"> +<tr><td class="val" id="output_len">output_len</td><td class="desc"> +<p>Before calling the function, this is the total size of the output buffer, which must be large enough to hold the entire uncompressed data (so the size of the uncompressed data must be known in advance). After calling the function, <code>output_len</code> is the size of the used data in <code>output</code>.</p> +</td></tr> +</table> + +<h4>return</h4> + +<p>FreeType error code. 0 means success.</p> +<h4>note</h4> + +<p>This function may return <code>FT_Err_Unimplemented_Feature</code> if your build of FreeType was not compiled with zlib support.</p> +<h4>since</h4> + +<p>2.5.1</p> +<hr> + + + + + + + + + + + </article> + </div> + </div> + </main> + + +<footer class="md-footer"> + + <div class="md-footer-nav"> + <nav class="md-footer-nav__inner md-grid"> + + <a href="ft2-module_management.html" title="Module Management" class="md-flex md-footer-nav__link md-footer-nav__link--prev" rel="prev"> + <div class="md-flex__cell md-flex__cell--shrink"> + <i class="md-icon md-icon--arrow-back md-footer-nav__button"></i> + </div> + <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> + <span class="md-flex__ellipsis"> + <span class="md-footer-nav__direction"> + Previous + </span> + Module Management + </span> + </div> + </a> + + + <a href="ft2-lzw.html" title="LZW Streams" class="md-flex md-footer-nav__link md-footer-nav__link--next" rel="next"> + <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> + <span class="md-flex__ellipsis"> + <span class="md-footer-nav__direction"> + Next + </span> + LZW Streams + </span> + </div> + <div class="md-flex__cell md-flex__cell--shrink"> + <i class="md-icon md-icon--arrow-forward md-footer-nav__button"></i> + </div> + </a> + + </nav> + </div> + + <div class="md-footer-meta md-typeset"> + <div class="md-footer-meta__inner md-grid"> + <div class="md-footer-copyright"> + + <div class="md-footer-copyright__highlight"> + Copyright 2020 <a href = "https://www.freetype.org/license.html">The FreeType Project</a>. + </div> + + powered by + <a href="https://www.mkdocs.org" target="_blank" rel="noopener">MkDocs</a> + and + <a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener"> + Material for MkDocs</a> + </div> + + </div> + </div> +</footer> + + </div> + + <script src="assets/javascripts/application.c33a9706.js"></script> + + <script>app.initialize({version:"1.1",url:{base:"."}})</script> + + <script src="javascripts/extra.js"></script> + + + </body> +</html>
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