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<!doctype html> <html lang="en" class="no-js"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width,initial-scale=1"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <meta name="description" content="API Reference Documentation for FreeType-2.10.4"> <meta name="author" content="FreeType Contributors"> <meta name="lang:clipboard.copy" content="Copy to clipboard"> <meta name="lang:clipboard.copied" content="Copied to clipboard"> <meta name="lang:search.language" content="en"> <meta name="lang:search.pipeline.stopwords" content="True"> <meta name="lang:search.pipeline.trimmer" content="True"> <meta name="lang:search.result.none" content="No matching documents"> <meta name="lang:search.result.one" content="1 matching document"> <meta name="lang:search.result.other" content="# matching documents"> <meta name="lang:search.tokenizer" content="[\s\-]+"> <link rel="shortcut icon" href="images/favico.ico"> <meta name="generator" content="mkdocs-1.1, 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type="checkbox" id="__toc"> <label class="md-nav__link md-nav__link--active" for="__toc"> List Processing </label> <a href="ft2-list_processing.html" title="List Processing" class="md-nav__link md-nav__link--active"> List Processing </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_list" class="md-nav__link"> FT_List </a> </li> <li class="md-nav__item"> <a href="#ft_listnode" class="md-nav__link"> FT_ListNode </a> </li> <li class="md-nav__item"> <a href="#ft_listrec" class="md-nav__link"> FT_ListRec </a> </li> <li class="md-nav__item"> <a href="#ft_listnoderec" class="md-nav__link"> FT_ListNodeRec </a> </li> <li class="md-nav__item"> <a href="#ft_list_add" class="md-nav__link"> FT_List_Add </a> </li> <li class="md-nav__item"> <a href="#ft_list_insert" class="md-nav__link"> FT_List_Insert </a> </li> <li class="md-nav__item"> <a href="#ft_list_find" class="md-nav__link"> FT_List_Find </a> </li> <li class="md-nav__item"> <a href="#ft_list_remove" class="md-nav__link"> FT_List_Remove </a> </li> <li class="md-nav__item"> <a href="#ft_list_up" class="md-nav__link"> FT_List_Up </a> </li> <li class="md-nav__item"> <a href="#ft_list_iterate" class="md-nav__link"> FT_List_Iterate </a> </li> <li class="md-nav__item"> <a href="#ft_list_iterator" class="md-nav__link"> FT_List_Iterator </a> </li> <li class="md-nav__item"> <a href="#ft_list_finalize" class="md-nav__link"> FT_List_Finalize </a> </li> <li class="md-nav__item"> <a href="#ft_list_destructor" class="md-nav__link"> FT_List_Destructor </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="ft2-outline_processing.html" title="Outline Processing" class="md-nav__link"> Outline Processing </a> </li> <li class="md-nav__item"> <a href="ft2-quick_advance.html" title="Quick retrieval of advance values" 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"> <a href="ft2-gzip.html" title="GZIP Streams" class="md-nav__link"> GZIP Streams </a> </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_list" class="md-nav__link"> FT_List </a> </li> <li class="md-nav__item"> <a href="#ft_listnode" class="md-nav__link"> FT_ListNode </a> </li> <li class="md-nav__item"> <a href="#ft_listrec" class="md-nav__link"> FT_ListRec </a> </li> <li class="md-nav__item"> <a href="#ft_listnoderec" class="md-nav__link"> FT_ListNodeRec </a> </li> <li class="md-nav__item"> <a href="#ft_list_add" class="md-nav__link"> FT_List_Add </a> </li> <li class="md-nav__item"> <a href="#ft_list_insert" class="md-nav__link"> FT_List_Insert </a> </li> <li class="md-nav__item"> <a href="#ft_list_find" class="md-nav__link"> FT_List_Find </a> </li> <li class="md-nav__item"> <a href="#ft_list_remove" class="md-nav__link"> FT_List_Remove </a> </li> <li class="md-nav__item"> <a href="#ft_list_up" class="md-nav__link"> FT_List_Up </a> </li> <li class="md-nav__item"> <a href="#ft_list_iterate" class="md-nav__link"> FT_List_Iterate </a> </li> <li class="md-nav__item"> <a href="#ft_list_iterator" class="md-nav__link"> FT_List_Iterator </a> </li> <li class="md-nav__item"> <a href="#ft_list_finalize" class="md-nav__link"> FT_List_Finalize </a> </li> <li class="md-nav__item"> <a href="#ft_list_destructor" class="md-nav__link"> FT_List_Destructor </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> » List Processing</p> <hr /> <h1 id="list-processing">List Processing<a class="headerlink" href="#list-processing" title="Permanent link">¶</a></h1> <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2> <p>This section contains various definitions related to list processing using doubly-linked nodes.</p> <h2 id="ft_list">FT_List<a class="headerlink" href="#ft_list" title="Permanent link">¶</a></h2> <p>Defined in FT_TYPES_H (freetype/fttypes.h).</p> <div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_ListRec_* <b>FT_List</b>; </code></pre></div> <p>A handle to a list record (see <code><a href="ft2-list_processing.html#ft_listrec">FT_ListRec</a></code>).</p> <hr> <h2 id="ft_listnode">FT_ListNode<a class="headerlink" href="#ft_listnode" title="Permanent link">¶</a></h2> <p>Defined in FT_TYPES_H (freetype/fttypes.h).</p> <div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_ListNodeRec_* <b>FT_ListNode</b>; </code></pre></div> <p>Many elements and objects in FreeType are listed through an <code><a href="ft2-list_processing.html#ft_list">FT_List</a></code> record (see <code><a href="ft2-list_processing.html#ft_listrec">FT_ListRec</a></code>). As its name suggests, an FT_ListNode is a handle to a single list element.</p> <hr> <h2 id="ft_listrec">FT_ListRec<a class="headerlink" href="#ft_listrec" title="Permanent link">¶</a></h2> <p>Defined in FT_TYPES_H (freetype/fttypes.h).</p> <div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_ListRec_ { <a href="ft2-list_processing.html#ft_listnode">FT_ListNode</a> head; <a href="ft2-list_processing.html#ft_listnode">FT_ListNode</a> tail; } <b>FT_ListRec</b>; </code></pre></div> <p>A structure used to hold a simple doubly-linked list. These are used in many parts of FreeType.</p> <h4>fields</h4> <table class="fields"> <tr><td class="val" id="head">head</td><td class="desc"> <p>The head (first element) of doubly-linked list.</p> </td></tr> <tr><td class="val" id="tail">tail</td><td class="desc"> <p>The tail (last element) of doubly-linked list.</p> </td></tr> </table> <hr> <h2 id="ft_listnoderec">FT_ListNodeRec<a class="headerlink" href="#ft_listnoderec" title="Permanent link">¶</a></h2> <p>Defined in FT_TYPES_H (freetype/fttypes.h).</p> <div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_ListNodeRec_ { <a href="ft2-list_processing.html#ft_listnode">FT_ListNode</a> prev; <a href="ft2-list_processing.html#ft_listnode">FT_ListNode</a> next; <span class="keyword">void</span>* data; } <b>FT_ListNodeRec</b>; </code></pre></div> <p>A structure used to hold a single list element.</p> <h4>fields</h4> <table class="fields"> <tr><td class="val" id="prev">prev</td><td class="desc"> <p>The previous element in the list. <code>NULL</code> if first.</p> </td></tr> <tr><td class="val" id="next">next</td><td class="desc"> <p>The next element in the list. <code>NULL</code> if last.</p> </td></tr> <tr><td class="val" id="data">data</td><td class="desc"> <p>A typeless pointer to the listed object.</p> </td></tr> </table> <hr> <h2 id="ft_list_add">FT_List_Add<a class="headerlink" href="#ft_list_add" title="Permanent link">¶</a></h2> <p>Defined in FT_LIST_H (freetype/ftlist.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) <b>FT_List_Add</b>( <a href="ft2-list_processing.html#ft_list">FT_List</a> list, <a href="ft2-list_processing.html#ft_listnode">FT_ListNode</a> node ); </code></pre></div> <p>Append an element to the end of a list.</p> <h4>inout</h4> <table class="fields"> <tr><td class="val" id="list">list</td><td class="desc"> <p>A pointer to the parent list.</p> </td></tr> <tr><td class="val" id="node">node</td><td class="desc"> <p>The node to append.</p> </td></tr> </table> <hr> <h2 id="ft_list_insert">FT_List_Insert<a class="headerlink" href="#ft_list_insert" title="Permanent link">¶</a></h2> <p>Defined in FT_LIST_H (freetype/ftlist.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) <b>FT_List_Insert</b>( <a href="ft2-list_processing.html#ft_list">FT_List</a> list, <a href="ft2-list_processing.html#ft_listnode">FT_ListNode</a> node ); </code></pre></div> <p>Insert an element at the head of a list.</p> <h4>inout</h4> <table class="fields"> <tr><td class="val" id="list">list</td><td class="desc"> <p>A pointer to parent list.</p> </td></tr> <tr><td class="val" id="node">node</td><td class="desc"> <p>The node to insert.</p> </td></tr> </table> <hr> <h2 id="ft_list_find">FT_List_Find<a class="headerlink" href="#ft_list_find" title="Permanent link">¶</a></h2> <p>Defined in FT_LIST_H (freetype/ftlist.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-list_processing.html#ft_listnode">FT_ListNode</a> ) <b>FT_List_Find</b>( <a href="ft2-list_processing.html#ft_list">FT_List</a> list, <span class="keyword">void</span>* data ); </code></pre></div> <p>Find the list node for a given listed object.</p> <h4>input</h4> <table class="fields"> <tr><td class="val" id="list">list</td><td class="desc"> <p>A pointer to the parent list.</p> </td></tr> <tr><td class="val" id="data">data</td><td class="desc"> <p>The address of the listed object.</p> </td></tr> </table> <h4>return</h4> <p>List node. <code>NULL</code> if it wasn't found.</p> <hr> <h2 id="ft_list_remove">FT_List_Remove<a class="headerlink" href="#ft_list_remove" title="Permanent link">¶</a></h2> <p>Defined in FT_LIST_H (freetype/ftlist.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) <b>FT_List_Remove</b>( <a href="ft2-list_processing.html#ft_list">FT_List</a> list, <a href="ft2-list_processing.html#ft_listnode">FT_ListNode</a> node ); </code></pre></div> <p>Remove a node from a list. This function doesn't check whether the node is in the list!</p> <h4>input</h4> <table class="fields"> <tr><td class="val" id="node">node</td><td class="desc"> <p>The node to remove.</p> </td></tr> </table> <h4>inout</h4> <table class="fields"> <tr><td class="val" id="list">list</td><td class="desc"> <p>A pointer to the parent list.</p> </td></tr> </table> <hr> <h2 id="ft_list_up">FT_List_Up<a class="headerlink" href="#ft_list_up" title="Permanent link">¶</a></h2> <p>Defined in FT_LIST_H (freetype/ftlist.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) <b>FT_List_Up</b>( <a href="ft2-list_processing.html#ft_list">FT_List</a> list, <a href="ft2-list_processing.html#ft_listnode">FT_ListNode</a> node ); </code></pre></div> <p>Move a node to the head/top of a list. Used to maintain LRU lists.</p> <h4>inout</h4> <table class="fields"> <tr><td class="val" id="list">list</td><td class="desc"> <p>A pointer to the parent list.</p> </td></tr> <tr><td class="val" id="node">node</td><td class="desc"> <p>The node to move.</p> </td></tr> </table> <hr> <h2 id="ft_list_iterate">FT_List_Iterate<a class="headerlink" href="#ft_list_iterate" title="Permanent link">¶</a></h2> <p>Defined in FT_LIST_H (freetype/ftlist.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> ) <b>FT_List_Iterate</b>( <a href="ft2-list_processing.html#ft_list">FT_List</a> list, <a href="ft2-list_processing.html#ft_list_iterator">FT_List_Iterator</a> iterator, <span class="keyword">void</span>* user ); </code></pre></div> <p>Parse a list and calls a given iterator function on each element. Note that parsing is stopped as soon as one of the iterator calls returns a non-zero value.</p> <h4>input</h4> <table class="fields"> <tr><td class="val" id="list">list</td><td class="desc"> <p>A handle to the list.</p> </td></tr> <tr><td class="val" id="iterator">iterator</td><td class="desc"> <p>An iterator function, called on each node of the list.</p> </td></tr> <tr><td class="val" id="user">user</td><td class="desc"> <p>A user-supplied field that is passed as the second argument to the iterator.</p> </td></tr> </table> <h4>return</h4> <p>The result (a FreeType error code) of the last iterator call.</p> <hr> <h2 id="ft_list_iterator">FT_List_Iterator<a class="headerlink" href="#ft_list_iterator" title="Permanent link">¶</a></h2> <p>Defined in FT_LIST_H (freetype/ftlist.h).</p> <div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <a href="ft2-basic_types.html#ft_error">FT_Error</a> (*<b>FT_List_Iterator</b>)( <a href="ft2-list_processing.html#ft_listnode">FT_ListNode</a> node, <span class="keyword">void</span>* user ); </code></pre></div> <p>An FT_List iterator function that is called during a list parse by <code><a href="ft2-list_processing.html#ft_list_iterate">FT_List_Iterate</a></code>.</p> <h4>input</h4> <table class="fields"> <tr><td class="val" id="node">node</td><td class="desc"> <p>The current iteration list node.</p> </td></tr> <tr><td class="val" id="user">user</td><td class="desc"> <p>A typeless pointer passed to <code><a href="ft2-list_processing.html#ft_list_iterate">FT_List_Iterate</a></code>. Can be used to point to the iteration's state.</p> </td></tr> </table> <hr> <h2 id="ft_list_finalize">FT_List_Finalize<a class="headerlink" href="#ft_list_finalize" title="Permanent link">¶</a></h2> <p>Defined in FT_LIST_H (freetype/ftlist.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) <b>FT_List_Finalize</b>( <a href="ft2-list_processing.html#ft_list">FT_List</a> list, <a href="ft2-list_processing.html#ft_list_destructor">FT_List_Destructor</a> destroy, <a href="ft2-system_interface.html#ft_memory">FT_Memory</a> memory, <span class="keyword">void</span>* user ); </code></pre></div> <p>Destroy all elements in the list as well as the list itself.</p> <h4>input</h4> <table class="fields"> <tr><td class="val" id="list">list</td><td class="desc"> <p>A handle to the list.</p> </td></tr> <tr><td class="val" id="destroy">destroy</td><td class="desc"> <p>A list destructor that will be applied to each element of the list. Set this to <code>NULL</code> if not needed.</p> </td></tr> <tr><td class="val" id="memory">memory</td><td class="desc"> <p>The current memory object that handles deallocation.</p> </td></tr> <tr><td class="val" id="user">user</td><td class="desc"> <p>A user-supplied field that is passed as the last argument to the destructor.</p> </td></tr> </table> <h4>note</h4> <p>This function expects that all nodes added by <code><a href="ft2-list_processing.html#ft_list_add">FT_List_Add</a></code> or <code><a href="ft2-list_processing.html#ft_list_insert">FT_List_Insert</a></code> have been dynamically allocated.</p> <hr> <h2 id="ft_list_destructor">FT_List_Destructor<a class="headerlink" href="#ft_list_destructor" title="Permanent link">¶</a></h2> <p>Defined in FT_LIST_H (freetype/ftlist.h).</p> <div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">void</span> (*<b>FT_List_Destructor</b>)( <a href="ft2-system_interface.html#ft_memory">FT_Memory</a> memory, <span class="keyword">void</span>* data, <span class="keyword">void</span>* user ); </code></pre></div> <p>An <code><a href="ft2-list_processing.html#ft_list">FT_List</a></code> iterator function that is called during a list finalization by <code><a href="ft2-list_processing.html#ft_list_finalize">FT_List_Finalize</a></code> to destroy all elements in a given list.</p> <h4>input</h4> <table class="fields"> <tr><td class="val" id="system">system</td><td class="desc"> <p>The current system object.</p> </td></tr> <tr><td class="val" id="data">data</td><td class="desc"> <p>The current object to destroy.</p> </td></tr> <tr><td class="val" id="user">user</td><td class="desc"> <p>A typeless pointer passed to <code><a href="ft2-list_processing.html#ft_list_iterate">FT_List_Iterate</a></code>. It can be used to point to the iteration's state.</p> </td></tr> </table> <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-computations.html" title="Computations" 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> Computations </span> </div> </a> <a href="ft2-outline_processing.html" title="Outline Processing" 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> Outline Processing </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>