<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>FreeType-2.6.2 API Reference</title>
<style type="text/css">
  a:link { color: #0000EF; }
  a:visited { color: #51188E; }
  a:hover { color: #FF0000; }

  body { font-family: Verdana, Geneva, Arial, Helvetica, serif;
         color: #000000;
         background: #FFFFFF;
         width: 87%;
         margin: auto; }

  div.section { width: 75%;
                margin: auto; }
  div.section hr { margin: 4ex 0 1ex 0; }
  div.section h4 { background-color: #EEEEFF;
                   font-size: medium;
                   font-style: oblique;
                   font-weight: bold;
                   margin: 3ex 0 1.5ex 9%;
                   padding: 0.3ex 0 0.3ex 1%; }
  div.section p { margin: 1.5ex 0 1.5ex 10%; }
  div.section pre { margin: 3ex 0 3ex 9%;
                    background-color: #D6E8FF;
                    padding: 2ex 0 2ex 1%; }
  div.section table.fields { width: 90%;
                             margin: 1.5ex 0 1.5ex 10%; }
  div.section table.toc { width: 95%;
                          margin: 1.5ex 0 1.5ex 5%; }
  div.timestamp { text-align: center;
                  font-size: 69%;
                  margin: 1.5ex 0 1.5ex 0; }

  h1 { text-align: center; }
  h3 { font-size: medium;
       margin: 4ex 0 1.5ex 0; }

  p { text-align: justify; }

  pre.colored { color: blue; }

  span.keyword { font-family: monospace;
                 text-align: left;
                 white-space: pre;
                 color: darkblue; }

  table.fields td.val { font-weight: bold;
                        text-align: right;
                        width: 30%;
                        vertical-align: baseline;
                        padding: 1ex 1em 1ex 0; }
  table.fields td.desc { vertical-align: baseline;
                         padding: 1ex 0 1ex 1em; }
  table.fields td.desc p:first-child { margin: 0; }
  table.fields td.desc p { margin: 1.5ex 0 0 0; }
  table.index { margin: 6ex auto 6ex auto;
                border: 0;
                border-collapse: separate;
                border-spacing: 1em 0.3ex; }
  table.index tr { padding: 0; }
  table.index td { padding: 0; }
  table.index-toc-link { width: 100%;
                         border: 0;
                         border-spacing: 0;
                         margin: 1ex 0 1ex 0; }
  table.index-toc-link td.left { padding: 0 0.5em 0 0.5em;
                                 font-size: 83%;
                                 text-align: left; }
  table.index-toc-link td.middle { padding: 0 0.5em 0 0.5em;
                                   font-size: 83%;
                                   text-align: center; }
  table.index-toc-link td.right { padding: 0 0.5em 0 0.5em;
                                  font-size: 83%;
                                  text-align: right; }
  table.synopsis { margin: 6ex auto 6ex auto;
                   border: 0;
                   border-collapse: separate;
                   border-spacing: 2em 0.6ex; }
  table.synopsis tr { padding: 0; }
  table.synopsis td { padding: 0; }
  table.toc td.link { width: 30%;
                      text-align: right;
                      vertical-align: baseline;
                      padding: 1ex 1em 1ex 0; }
  table.toc td.desc { vertical-align: baseline;
                      padding: 1ex 0 1ex 1em;
                      text-align: left; }
  table.toc td.desc p:first-child { margin: 0;
                                    text-align: left; }
  table.toc td.desc p { margin: 1.5ex 0 0 0;
                        text-align: left; }

</style>
</head>
<body>

<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-2.6.2 API Reference</h1>

<h1 id="error_enumerations">Error Enumerations</h1>

<p>The header file &lsquo;fterrors.h&rsquo; (which is automatically included by &lsquo;freetype.h&rsquo; defines the handling of FreeType's enumeration constants. It can also be used to generate error message strings with a small macro trick explained below.</p>
<p><b>Error</b> <b>Formats</b></p>
<p>The configuration macro FT_CONFIG_OPTION_USE_MODULE_ERRORS can be defined in &lsquo;ftoption.h&rsquo; in order to make the higher byte indicate the module where the error has happened (this is not compatible with standard builds of FreeType&amp;nbsp;2, however). See the file &lsquo;ftmoderr.h&rsquo; for more details.</p>
<p><b>Error</b> <b>Message</b> <b>Strings</b></p>
<p>Error definitions are set up with special macros that allow client applications to build a table of error message strings. The strings are not included in a normal build of FreeType&amp;nbsp;2 to save space (most client applications do not use them).</p>
<p>To do so, you have to define the following macros before including this file.</p>
<pre class="colored">
  FT_ERROR_START_LIST                                               
</pre>
<p>This macro is called before anything else to define the start of the error list. It is followed by several FT_ERROR_DEF calls.</p>
<pre class="colored">
  FT_ERROR_DEF( e, v, s )                                           
</pre>
<p>This macro is called to define one single error. &lsquo;e&rsquo; is the error code identifier (e.g., &lsquo;Invalid_Argument&rsquo;), &lsquo;v&rsquo; is the error's numerical value, and &lsquo;s&rsquo; is the corresponding error string.</p>
<pre class="colored">
  FT_ERROR_END_LIST                                                 
</pre>
<p>This macro ends the list.</p>
<p>Additionally, you have to undefine &lsquo;__FTERRORS_H__&rsquo; before #including this file.</p>
<p>Here is a simple example.</p>
<pre class="colored">
  #undef __FTERRORS_H__                                             
  #define FT_ERRORDEF( e, v, s )  { e, s },                         
  #define FT_ERROR_START_LIST     {                                 
  #define FT_ERROR_END_LIST       { 0, NULL } };                    
                                                                    
  const struct                                                      
  {                                                                 
    int          err_code;                                          
    const char*  err_msg;                                           
  } ft_errors[] =                                                   
                                                                    
  #include FT_ERRORS_H                                              
</pre>
<p>Note that &lsquo;FT_Err_Ok&rsquo; is <i>not</i> defined with &lsquo;FT_ERRORDEF&rsquo; but with &lsquo;FT_NOERRORDEF&rsquo;; it is always zero.</p>

</body>
</html>