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Code Editor : ft2-list_processing.html

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<title>FreeType-2.8 API Reference</title>
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<table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table>
<h1>FreeType-2.8 API Reference</h1>

<h1 id="list_processing">List Processing</h1>
<h2>Synopsis</h2>
<table class="synopsis">
<tr><td><a href="#FT_List">FT_List</a></td><td><a href="#FT_List_Add">FT_List_Add</a></td><td><a href="#FT_List_Iterate">FT_List_Iterate</a></td></tr>
<tr><td><a href="#FT_ListNode">FT_ListNode</a></td><td><a href="#FT_List_Insert">FT_List_Insert</a></td><td><a href="#FT_List_Iterator">FT_List_Iterator</a></td></tr>
<tr><td><a href="#FT_ListRec">FT_ListRec</a></td><td><a href="#FT_List_Find">FT_List_Find</a></td><td><a href="#FT_List_Finalize">FT_List_Finalize</a></td></tr>
<tr><td><a href="#FT_ListNodeRec">FT_ListNodeRec</a></td><td><a href="#FT_List_Remove">FT_List_Remove</a></td><td><a href="#FT_List_Destructor">FT_List_Destructor</a></td></tr>
<tr><td>&nbsp;</td><td><a href="#FT_List_Up">FT_List_Up</a></td><td></td></tr>
</table>

<p>This section contains various definitions related to list processing using doubly-linked nodes.</p>

<div class="section">
<h3 id="FT_List">FT_List</h3>
<p>Defined in FT_TYPES_H (freetype/fttypes.h).</p>
<pre>
  <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_ListRec_*  <b>FT_List</b>;
</pre>

<p>A handle to a list record (see <a href="ft2-list_processing.html#FT_ListRec">FT_ListRec</a>).</p>

<hr>
<table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="middle">[<a href="#">Top</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table></div>

<div class="section">
<h3 id="FT_ListNode">FT_ListNode</h3>
<p>Defined in FT_TYPES_H (freetype/fttypes.h).</p>
<pre>
  <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_ListNodeRec_*  <b>FT_ListNode</b>;
</pre>

<p>Many elements and objects in FreeType are listed through an <a href="ft2-list_processing.html#FT_List">FT_List</a> record (see <a href="ft2-list_processing.html#FT_ListRec">FT_ListRec</a>). As its name suggests, an FT_ListNode is a handle to a single list element.</p>

<div class="section">
<h3 id="FT_ListRec">FT_ListRec</h3>
<p>Defined in FT_TYPES_H (freetype/fttypes.h).</p>
<pre>
  <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>;
</pre>

<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>

<div class="section">
<h3 id="FT_ListNodeRec">FT_ListNodeRec</h3>
<p>Defined in FT_TYPES_H (freetype/fttypes.h).</p>
<pre>
  <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>;
</pre>

<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. NULL if first.</p>
</td></tr>
<tr><td class="val" id="next">next</td><td class="desc">
<p>The next element in the list. NULL 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>

<div class="section">
<h3 id="FT_List_Add">FT_List_Add</h3>
<p>Defined in FT_LIST_H (freetype/ftlist.h).</p>
<pre>
  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 );
</pre>

<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>

<div class="section">
<h3 id="FT_List_Insert">FT_List_Insert</h3>
<p>Defined in FT_LIST_H (freetype/ftlist.h).</p>
<pre>
  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 );
</pre>

<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>

<div class="section">
<h3 id="FT_List_Find">FT_List_Find</h3>
<p>Defined in FT_LIST_H (freetype/ftlist.h).</p>
<pre>
  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 );
</pre>

<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. NULL if it wasn't found.</p>

<div class="section">
<h3 id="FT_List_Remove">FT_List_Remove</h3>
<p>Defined in FT_LIST_H (freetype/ftlist.h).</p>
<pre>
  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 );
</pre>

<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>

<div class="section">
<h3 id="FT_List_Up">FT_List_Up</h3>
<p>Defined in FT_LIST_H (freetype/ftlist.h).</p>
<pre>
  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 );
</pre>

<p>Move a node to the head/top of a list. Used to maintain LRU lists.</p>

<div class="section">
<h3 id="FT_List_Iterate">FT_List_Iterate</h3>
<p>Defined in FT_LIST_H (freetype/ftlist.h).</p>
<pre>
  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 );
</pre>

<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>

<div class="section">
<h3 id="FT_List_Iterator">FT_List_Iterator</h3>
<p>Defined in FT_LIST_H (freetype/ftlist.h).</p>
<pre>
  <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 );
</pre>

<p>An FT_List iterator function that is called during a list parse by <a href="ft2-list_processing.html#FT_List_Iterate">FT_List_Iterate</a>.</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 <a href="ft2-list_processing.html#FT_List_Iterate">FT_List_Iterate</a>. Can be used to point to the iteration's state.</p>
</td></tr>
</table>

<div class="section">
<h3 id="FT_List_Finalize">FT_List_Finalize</h3>
<p>Defined in FT_LIST_H (freetype/ftlist.h).</p>
<pre>
  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 );
</pre>

<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 NULL 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 <a href="ft2-list_processing.html#FT_List_Add">FT_List_Add</a> or <a href="ft2-list_processing.html#FT_List_Insert">FT_List_Insert</a> have been dynamically allocated.</p>

<div class="section">
<h3 id="FT_List_Destructor">FT_List_Destructor</h3>
<p>Defined in FT_LIST_H (freetype/ftlist.h).</p>
<pre>
  <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 );
</pre>

<p>An <a href="ft2-list_processing.html#FT_List">FT_List</a> iterator function that is called during a list finalization by <a href="ft2-list_processing.html#FT_List_Finalize">FT_List_Finalize</a> 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 <a href="ft2-list_processing.html#FT_List_Iterate">FT_List_Iterate</a>. It can be used to point to the iteration's state.</p>
</td></tr>
</table>

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Code Editor : ft2-list_processing.html