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+ <a href="ft2-layer_management.html" title="Glyph Layer Management" class="md-nav__link">
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+ <a href="ft2-mac_specific.html" title="Mac Specific Interface" class="md-nav__link">
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+ <a href="ft2-sizes_management.html" title="Size Management" class="md-nav__link">
+ Size Management
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+ <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
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+ Format-Specific API
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+ <a href="ft2-multiple_masters.html" title="Multiple Masters" class="md-nav__link">
+ Multiple Masters
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+ TrueType Tables
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+ <li class="md-nav__item">
+ <a href="ft2-type1_tables.html" title="Type 1 Tables" class="md-nav__link">
+ Type 1 Tables
+ </a>
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+ <li class="md-nav__item">
+ <a href="ft2-sfnt_names.html" title="SFNT Names" class="md-nav__link">
+ SFNT Names
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+ <li class="md-nav__item">
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+ BDF and PCF Files
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+ CID Fonts
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+ PFR Fonts
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+ Window FNT Files
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+ <label class="md-nav__link" for="nav-6">
+ Controlling FreeType Modules
+ </label>
+ <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
+ <label class="md-nav__title" for="nav-6">
+ Controlling FreeType Modules
+ </label>
+ <ul class="md-nav__list" data-md-scrollfix>
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+ <li class="md-nav__item">
+ <a href="ft2-auto_hinter.html" title="The auto-hinter" class="md-nav__link">
+ The auto-hinter
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+ <li class="md-nav__item">
+ <a href="ft2-cff_driver.html" title="The CFF driver" class="md-nav__link">
+ The CFF driver
+ </a>
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+ <li class="md-nav__item">
+ <a href="ft2-t1_cid_driver.html" title="The Type 1 and CID drivers" class="md-nav__link">
+ The Type 1 and CID drivers
+ </a>
+ </li>
+
+
+
+
+
+
+
+ <li class="md-nav__item">
+ <a href="ft2-tt_driver.html" title="The TrueType driver" class="md-nav__link">
+ The TrueType driver
+ </a>
+ </li>
+
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+
+
+
+
+ <li class="md-nav__item">
+ <a href="ft2-pcf_driver.html" title="The PCF driver" class="md-nav__link">
+ The PCF driver
+ </a>
+ </li>
+
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+ <li class="md-nav__item">
+ <a href="ft2-properties.html" title="Driver properties" class="md-nav__link">
+ Driver properties
+ </a>
+ </li>
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+ <li class="md-nav__item">
+ <a href="ft2-parameter_tags.html" title="Parameter Tags" class="md-nav__link">
+ Parameter Tags
+ </a>
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+ <li class="md-nav__item">
+ <a href="ft2-lcd_rendering.html" title="Subpixel Rendering" class="md-nav__link">
+ Subpixel Rendering
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+ Cache Sub-System
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+ <a href="ft2-cache_subsystem.html" title="Cache Sub-System" class="md-nav__link">
+ Cache Sub-System
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+ Support API
+ </label>
+ <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
+ <label class="md-nav__title" for="nav-8">
+ Support API
+ </label>
+ <ul class="md-nav__list" data-md-scrollfix>
+
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+
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+
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+ <li class="md-nav__item">
+ <a href="ft2-computations.html" title="Computations" class="md-nav__link">
+ Computations
+ </a>
+ </li>
+
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+
+
+
+ <li class="md-nav__item">
+ <a href="ft2-list_processing.html" title="List Processing" class="md-nav__link">
+ List Processing
+ </a>
+ </li>
+
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+
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+
+
+
+ <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 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">
+ Module Management
+ </label>
+
+ <a href="ft2-module_management.html" title="Module Management" class="md-nav__link md-nav__link--active">
+ Module Management
+ </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_module" class="md-nav__link">
+ FT_Module
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_module_constructor" class="md-nav__link">
+ FT_Module_Constructor
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_module_destructor" class="md-nav__link">
+ FT_Module_Destructor
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_module_requester" class="md-nav__link">
+ FT_Module_Requester
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_module_class" class="md-nav__link">
+ FT_Module_Class
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_add_module" class="md-nav__link">
+ FT_Add_Module
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_get_module" class="md-nav__link">
+ FT_Get_Module
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_remove_module" class="md-nav__link">
+ FT_Remove_Module
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_add_default_modules" class="md-nav__link">
+ FT_Add_Default_Modules
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_property_set" class="md-nav__link">
+ FT_Property_Set
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_property_get" class="md-nav__link">
+ FT_Property_Get
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_set_default_properties" class="md-nav__link">
+ FT_Set_Default_Properties
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_new_library" class="md-nav__link">
+ FT_New_Library
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_done_library" class="md-nav__link">
+ FT_Done_Library
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_reference_library" class="md-nav__link">
+ FT_Reference_Library
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_renderer" class="md-nav__link">
+ FT_Renderer
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_renderer_class" class="md-nav__link">
+ FT_Renderer_Class
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_get_renderer" class="md-nav__link">
+ FT_Get_Renderer
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_set_renderer" class="md-nav__link">
+ FT_Set_Renderer
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_set_debug_hook" class="md-nav__link">
+ FT_Set_Debug_Hook
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_driver" class="md-nav__link">
+ FT_Driver
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_debughook_func" class="md-nav__link">
+ FT_DebugHook_Func
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_debug_hook_xxx" class="md-nav__link">
+ FT_DEBUG_HOOK_XXX
+ </a>
+
+</li>
+
+
+
+
+
+ </ul>
+
+</nav>
+
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+
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+ <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>
+
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+
+ <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>
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+
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+
+ <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">
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+ <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>
+
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+
+
+
+
+ <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>
+
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+ <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_module" class="md-nav__link">
+ FT_Module
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_module_constructor" class="md-nav__link">
+ FT_Module_Constructor
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_module_destructor" class="md-nav__link">
+ FT_Module_Destructor
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_module_requester" class="md-nav__link">
+ FT_Module_Requester
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_module_class" class="md-nav__link">
+ FT_Module_Class
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_add_module" class="md-nav__link">
+ FT_Add_Module
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_get_module" class="md-nav__link">
+ FT_Get_Module
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_remove_module" class="md-nav__link">
+ FT_Remove_Module
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_add_default_modules" class="md-nav__link">
+ FT_Add_Default_Modules
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_property_set" class="md-nav__link">
+ FT_Property_Set
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_property_get" class="md-nav__link">
+ FT_Property_Get
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_set_default_properties" class="md-nav__link">
+ FT_Set_Default_Properties
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_new_library" class="md-nav__link">
+ FT_New_Library
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_done_library" class="md-nav__link">
+ FT_Done_Library
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_reference_library" class="md-nav__link">
+ FT_Reference_Library
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_renderer" class="md-nav__link">
+ FT_Renderer
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_renderer_class" class="md-nav__link">
+ FT_Renderer_Class
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_get_renderer" class="md-nav__link">
+ FT_Get_Renderer
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_set_renderer" class="md-nav__link">
+ FT_Set_Renderer
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_set_debug_hook" class="md-nav__link">
+ FT_Set_Debug_Hook
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_driver" class="md-nav__link">
+ FT_Driver
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_debughook_func" class="md-nav__link">
+ FT_DebugHook_Func
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_debug_hook_xxx" class="md-nav__link">
+ FT_DEBUG_HOOK_XXX
+ </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> &raquo; <a href="../">Docs</a> &raquo; <a href="index.html#support-api">Support API</a> &raquo; Module Management</p>
+<hr />
+<h1 id="module-management">Module Management<a class="headerlink" href="#module-management" title="Permanent link">&para;</a></h1>
+<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">&para;</a></h2>
+<p>The definitions below are used to manage modules within FreeType. Modules can be added, upgraded, and removed at runtime. Additionally, some module properties can be controlled also.</p>
+<p>Here is a list of possible values of the <code>module_name</code> field in the <code><a href="ft2-module_management.html#ft_module_class">FT_Module_Class</a></code> structure.
+<div class="highlight"><pre><span></span><code> autofitter
+ bdf
+ cff
+ gxvalid
+ otvalid
+ pcf
+ pfr
+ psaux
+ pshinter
+ psnames
+ raster1
+ sfnt
+ smooth
+ truetype
+ type1
+ type42
+ t1cid
+ winfonts
+</code></pre></div></p>
+<p>Note that the FreeType Cache sub-system is not a FreeType module.</p>
+<h2 id="ft_module">FT_Module<a class="headerlink" href="#ft_module" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
+<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_ModuleRec_* <b>FT_Module</b>;
+</code></pre></div>
+
+<p>A handle to a given FreeType module object. A module can be a font driver, a renderer, or anything else that provides services to the former.</p>
+<hr>
+
+<h2 id="ft_module_constructor">FT_Module_Constructor<a class="headerlink" href="#ft_module_constructor" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.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_Module_Constructor</b>)( <a href="ft2-module_management.html#ft_module">FT_Module</a> module );
+</code></pre></div>
+
+<p>A function used to initialize (not create) a new module object.</p>
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="module">module</td><td class="desc">
+<p>The module to initialize.</p>
+</td></tr>
+</table>
+
+<hr>
+
+<h2 id="ft_module_destructor">FT_Module_Destructor<a class="headerlink" href="#ft_module_destructor" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">void</span>
+ (*<b>FT_Module_Destructor</b>)( <a href="ft2-module_management.html#ft_module">FT_Module</a> module );
+</code></pre></div>
+
+<p>A function used to finalize (not destroy) a given module object.</p>
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="module">module</td><td class="desc">
+<p>The module to finalize.</p>
+</td></tr>
+</table>
+
+<hr>
+
+<h2 id="ft_module_requester">FT_Module_Requester<a class="headerlink" href="#ft_module_requester" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> FT_Module_Interface
+ (*<b>FT_Module_Requester</b>)( <a href="ft2-module_management.html#ft_module">FT_Module</a> module,
+ <span class="keyword">const</span> <span class="keyword">char</span>* name );
+</code></pre></div>
+
+<p>A function used to query a given module for a specific interface.</p>
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="module">module</td><td class="desc">
+<p>The module to be searched.</p>
+</td></tr>
+<tr><td class="val" id="name">name</td><td class="desc">
+<p>The name of the interface in the module.</p>
+</td></tr>
+</table>
+
+<hr>
+
+<h2 id="ft_module_class">FT_Module_Class<a class="headerlink" href="#ft_module_class" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Module_Class_
+ {
+ <a href="ft2-basic_types.html#ft_ulong">FT_ULong</a> module_flags;
+ <a href="ft2-basic_types.html#ft_long">FT_Long</a> module_size;
+ <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_string">FT_String</a>* module_name;
+ <a href="ft2-basic_types.html#ft_fixed">FT_Fixed</a> module_version;
+ <a href="ft2-basic_types.html#ft_fixed">FT_Fixed</a> module_requires;
+
+ <span class="keyword">const</span> <span class="keyword">void</span>* module_interface;
+
+ <a href="ft2-module_management.html#ft_module_constructor">FT_Module_Constructor</a> module_init;
+ <a href="ft2-module_management.html#ft_module_destructor">FT_Module_Destructor</a> module_done;
+ <a href="ft2-module_management.html#ft_module_requester">FT_Module_Requester</a> get_interface;
+
+ } <b>FT_Module_Class</b>;
+</code></pre></div>
+
+<p>The module class descriptor. While being a public structure necessary for FreeType's module bookkeeping, most of the fields are essentially internal, not to be used directly by an application.</p>
+<h4>fields</h4>
+
+<table class="fields">
+<tr><td class="val" id="module_flags">module_flags</td><td class="desc">
+<p>Bit flags describing the module.</p>
+</td></tr>
+<tr><td class="val" id="module_size">module_size</td><td class="desc">
+<p>The size of one module object/instance in bytes.</p>
+</td></tr>
+<tr><td class="val" id="module_name">module_name</td><td class="desc">
+<p>The name of the module.</p>
+</td></tr>
+<tr><td class="val" id="module_version">module_version</td><td class="desc">
+<p>The version, as a 16.16 fixed number (major.minor).</p>
+</td></tr>
+<tr><td class="val" id="module_requires">module_requires</td><td class="desc">
+<p>The version of FreeType this module requires, as a 16.16 fixed number (major.minor). Starts at version 2.0, i.e., 0x20000.</p>
+</td></tr>
+<tr><td class="val" id="module_interface">module_interface</td><td class="desc">
+<p>A typeless pointer to a structure (which varies between different modules) that holds the module's interface functions. This is essentially what <code>get_interface</code> returns.</p>
+</td></tr>
+<tr><td class="val" id="module_init">module_init</td><td class="desc">
+<p>The initializing function.</p>
+</td></tr>
+<tr><td class="val" id="module_done">module_done</td><td class="desc">
+<p>The finalizing function.</p>
+</td></tr>
+<tr><td class="val" id="get_interface">get_interface</td><td class="desc">
+<p>The interface requesting function.</p>
+</td></tr>
+</table>
+
+<hr>
+
+<h2 id="ft_add_module">FT_Add_Module<a class="headerlink" href="#ft_add_module" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Add_Module</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <span class="keyword">const</span> <a href="ft2-module_management.html#ft_module_class">FT_Module_Class</a>* clazz );
+</code></pre></div>
+
+<p>Add a new module to a given library instance.</p>
+<h4>inout</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to the library object.</p>
+</td></tr>
+</table>
+
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="clazz">clazz</td><td class="desc">
+<p>A pointer to class descriptor for the module.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>An error will be returned if a module already exists by that name, or if the module requires a version of FreeType that is too great.</p>
+<hr>
+
+<h2 id="ft_get_module">FT_Get_Module<a class="headerlink" href="#ft_get_module" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-module_management.html#ft_module">FT_Module</a> )
+ <b>FT_Get_Module</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <span class="keyword">const</span> <span class="keyword">char</span>* module_name );
+</code></pre></div>
+
+<p>Find a module by its name.</p>
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to the library object.</p>
+</td></tr>
+<tr><td class="val" id="module_name">module_name</td><td class="desc">
+<p>The module's name (as an ASCII string).</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>A module handle. 0&nbsp;if none was found.</p>
+<h4>note</h4>
+
+<p>FreeType's internal modules aren't documented very well, and you should look up the source code for details.</p>
+<hr>
+
+<h2 id="ft_remove_module">FT_Remove_Module<a class="headerlink" href="#ft_remove_module" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Remove_Module</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <a href="ft2-module_management.html#ft_module">FT_Module</a> module );
+</code></pre></div>
+
+<p>Remove a given module from a library instance.</p>
+<h4>inout</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to a library object.</p>
+</td></tr>
+</table>
+
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="module">module</td><td class="desc">
+<p>A handle to a module object.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>The module object is destroyed by the function in case of success.</p>
+<hr>
+
+<h2 id="ft_add_default_modules">FT_Add_Default_Modules<a class="headerlink" href="#ft_add_default_modules" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> )
+ <b>FT_Add_Default_Modules</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library );
+</code></pre></div>
+
+<p>Add the set of default drivers to a given library object. This is only useful when you create a library object with <code><a href="ft2-module_management.html#ft_new_library">FT_New_Library</a></code> (usually to plug a custom memory manager).</p>
+<h4>inout</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to a new library object.</p>
+</td></tr>
+</table>
+
+<hr>
+
+<h2 id="ft_property_set">FT_Property_Set<a class="headerlink" href="#ft_property_set" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Property_Set</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_string">FT_String</a>* module_name,
+ <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_string">FT_String</a>* property_name,
+ <span class="keyword">const</span> <span class="keyword">void</span>* value );
+</code></pre></div>
+
+<p>Set a property for a given module.</p>
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to the library the module is part of.</p>
+</td></tr>
+<tr><td class="val" id="module_name">module_name</td><td class="desc">
+<p>The module name.</p>
+</td></tr>
+<tr><td class="val" id="property_name">property_name</td><td class="desc">
+<p>The property name. Properties are described in section &lsquo;<a href="ft2-properties.html#properties">Driver properties</a>&rsquo;.</p>
+<p>Note that only a few modules have properties.</p>
+</td></tr>
+<tr><td class="val" id="value">value</td><td class="desc">
+<p>A generic pointer to a variable or structure that gives the new value of the property. The exact definition of <code>value</code> is dependent on the property; see section &lsquo;<a href="ft2-properties.html#properties">Driver properties</a>&rsquo;.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>If <code>module_name</code> isn't a valid module name, or <code>property_name</code> doesn't specify a valid property, or if <code>value</code> doesn't represent a valid value for the given property, an error is returned.</p>
+<p>The following example sets property &lsquo;bar&rsquo; (a simple integer) in module &lsquo;foo&rsquo; to value&nbsp;1.
+<div class="highlight"><pre><span></span><code> FT_UInt bar;
+
+
+ bar = 1;
+ FT_Property_Set( library, &quot;foo&quot;, &quot;bar&quot;, &amp;bar );
+</code></pre></div></p>
+<p>Note that the FreeType Cache sub-system doesn't recognize module property changes. To avoid glyph lookup confusion within the cache you should call <code><a href="ft2-cache_subsystem.html#ftc_manager_reset">FTC_Manager_Reset</a></code> to completely flush the cache if a module property gets changed after <code><a href="ft2-cache_subsystem.html#ftc_manager_new">FTC_Manager_New</a></code> has been called.</p>
+<p>It is not possible to set properties of the FreeType Cache sub-system itself with FT_Property_Set; use ?FTC_Property_Set? instead.</p>
+<h4>since</h4>
+
+<p>2.4.11</p>
+<hr>
+
+<h2 id="ft_property_get">FT_Property_Get<a class="headerlink" href="#ft_property_get" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Property_Get</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_string">FT_String</a>* module_name,
+ <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_string">FT_String</a>* property_name,
+ <span class="keyword">void</span>* value );
+</code></pre></div>
+
+<p>Get a module's property value.</p>
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to the library the module is part of.</p>
+</td></tr>
+<tr><td class="val" id="module_name">module_name</td><td class="desc">
+<p>The module name.</p>
+</td></tr>
+<tr><td class="val" id="property_name">property_name</td><td class="desc">
+<p>The property name. Properties are described in section &lsquo;<a href="ft2-properties.html#properties">Driver properties</a>&rsquo;.</p>
+</td></tr>
+</table>
+
+<h4>inout</h4>
+
+<table class="fields">
+<tr><td class="val" id="value">value</td><td class="desc">
+<p>A generic pointer to a variable or structure that gives the value of the property. The exact definition of <code>value</code> is dependent on the property; see section &lsquo;<a href="ft2-properties.html#properties">Driver properties</a>&rsquo;.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>If <code>module_name</code> isn't a valid module name, or <code>property_name</code> doesn't specify a valid property, or if <code>value</code> doesn't represent a valid value for the given property, an error is returned.</p>
+<p>The following example gets property &lsquo;baz&rsquo; (a range) in module &lsquo;foo&rsquo;.
+<div class="highlight"><pre><span></span><code> typedef range_
+ {
+ FT_Int32 min;
+ FT_Int32 max;
+
+ } range;
+
+ range baz;
+
+
+ FT_Property_Get( library, &quot;foo&quot;, &quot;baz&quot;, &amp;baz );
+</code></pre></div></p>
+<p>It is not possible to retrieve properties of the FreeType Cache sub-system with FT_Property_Get; use ?FTC_Property_Get? instead.</p>
+<h4>since</h4>
+
+<p>2.4.11</p>
+<hr>
+
+<h2 id="ft_set_default_properties">FT_Set_Default_Properties<a class="headerlink" href="#ft_set_default_properties" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> )
+ <b>FT_Set_Default_Properties</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library );
+</code></pre></div>
+
+<p>If compilation option <code>FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES</code> is set, this function reads the <code>FREETYPE_PROPERTIES</code> environment variable to control driver properties. See section &lsquo;<a href="ft2-properties.html#properties">Driver properties</a>&rsquo; for more.</p>
+<p>If the compilation option is not set, this function does nothing.</p>
+<p><code>FREETYPE_PROPERTIES</code> has the following syntax form (broken here into multiple lines for better readability).
+<div class="highlight"><pre><span></span><code> &lt;optional whitespace&gt;
+ &lt;module-name1&gt; &#39;:&#39;
+ &lt;property-name1&gt; &#39;=&#39; &lt;property-value1&gt;
+ &lt;whitespace&gt;
+ &lt;module-name2&gt; &#39;:&#39;
+ &lt;property-name2&gt; &#39;=&#39; &lt;property-value2&gt;
+ ...
+</code></pre></div></p>
+<p>Example:
+<div class="highlight"><pre><span></span><code> FREETYPE_PROPERTIES=truetype:interpreter-version=35 \
+ cff:no-stem-darkening=0 \
+ autofitter:warping=1
+</code></pre></div></p>
+<h4>inout</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to a new library object.</p>
+</td></tr>
+</table>
+
+<h4>since</h4>
+
+<p>2.8</p>
+<hr>
+
+<h2 id="ft_new_library">FT_New_Library<a class="headerlink" href="#ft_new_library" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_New_Library</b>( <a href="ft2-system_interface.html#ft_memory">FT_Memory</a> memory,
+ <a href="ft2-base_interface.html#ft_library">FT_Library</a> *alibrary );
+</code></pre></div>
+
+<p>This function is used to create a new FreeType library instance from a given memory object. It is thus possible to use libraries with distinct memory allocators within the same program. Note, however, that the used <code><a href="ft2-system_interface.html#ft_memory">FT_Memory</a></code> structure is expected to remain valid for the life of the <code><a href="ft2-base_interface.html#ft_library">FT_Library</a></code> object.</p>
+<p>Normally, you would call this function (followed by a call to <code><a href="ft2-module_management.html#ft_add_default_modules">FT_Add_Default_Modules</a></code> or a series of calls to <code><a href="ft2-module_management.html#ft_add_module">FT_Add_Module</a></code>, and a call to <code><a href="ft2-module_management.html#ft_set_default_properties">FT_Set_Default_Properties</a></code>) instead of <code><a href="ft2-base_interface.html#ft_init_freetype">FT_Init_FreeType</a></code> to initialize the FreeType library.</p>
+<p>Don't use <code><a href="ft2-base_interface.html#ft_done_freetype">FT_Done_FreeType</a></code> but <code><a href="ft2-module_management.html#ft_done_library">FT_Done_Library</a></code> to destroy a library instance.</p>
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="memory">memory</td><td class="desc">
+<p>A handle to the original memory object.</p>
+</td></tr>
+</table>
+
+<h4>output</h4>
+
+<table class="fields">
+<tr><td class="val" id="alibrary">alibrary</td><td class="desc">
+<p>A pointer to handle of a new library object.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>See the discussion of reference counters in the description of <code><a href="ft2-module_management.html#ft_reference_library">FT_Reference_Library</a></code>.</p>
+<hr>
+
+<h2 id="ft_done_library">FT_Done_Library<a class="headerlink" href="#ft_done_library" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Done_Library</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library );
+</code></pre></div>
+
+<p>Discard a given library object. This closes all drivers and discards all resource objects.</p>
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to the target library.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>See the discussion of reference counters in the description of <code><a href="ft2-module_management.html#ft_reference_library">FT_Reference_Library</a></code>.</p>
+<hr>
+
+<h2 id="ft_reference_library">FT_Reference_Library<a class="headerlink" href="#ft_reference_library" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Reference_Library</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library );
+</code></pre></div>
+
+<p>A counter gets initialized to&nbsp;1 at the time an <code><a href="ft2-base_interface.html#ft_library">FT_Library</a></code> structure is created. This function increments the counter. <code><a href="ft2-module_management.html#ft_done_library">FT_Done_Library</a></code> then only destroys a library if the counter is&nbsp;1, otherwise it simply decrements the counter.</p>
+<p>This function helps in managing life-cycles of structures that reference <code><a href="ft2-base_interface.html#ft_library">FT_Library</a></code> objects.</p>
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to a target library object.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>since</h4>
+
+<p>2.4.2</p>
+<hr>
+
+<h2 id="ft_renderer">FT_Renderer<a class="headerlink" href="#ft_renderer" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
+<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_RendererRec_* <b>FT_Renderer</b>;
+</code></pre></div>
+
+<p>A handle to a given FreeType renderer. A renderer is a module in charge of converting a glyph's outline image to a bitmap. It supports a single glyph image format, and one or more target surface depths.</p>
+<hr>
+
+<h2 id="ft_renderer_class">FT_Renderer_Class<a class="headerlink" href="#ft_renderer_class" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_RENDER_H (freetype/ftrender.h).</p>
+<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Renderer_Class_
+ {
+ <a href="ft2-module_management.html#ft_module_class">FT_Module_Class</a> root;
+
+ <a href="ft2-basic_types.html#ft_glyph_format">FT_Glyph_Format</a> glyph_format;
+
+ FT_Renderer_RenderFunc render_glyph;
+ FT_Renderer_TransformFunc transform_glyph;
+ FT_Renderer_GetCBoxFunc get_glyph_cbox;
+ FT_Renderer_SetModeFunc set_mode;
+
+ <a href="ft2-raster.html#ft_raster_funcs">FT_Raster_Funcs</a>* raster_class;
+
+ } <b>FT_Renderer_Class</b>;
+</code></pre></div>
+
+<p>The renderer module class descriptor.</p>
+<h4>fields</h4>
+
+<table class="fields">
+<tr><td class="val" id="root">root</td><td class="desc">
+<p>The root <code><a href="ft2-module_management.html#ft_module_class">FT_Module_Class</a></code> fields.</p>
+</td></tr>
+<tr><td class="val" id="glyph_format">glyph_format</td><td class="desc">
+<p>The glyph image format this renderer handles.</p>
+</td></tr>
+<tr><td class="val" id="render_glyph">render_glyph</td><td class="desc">
+<p>A method used to render the image that is in a given glyph slot into a bitmap.</p>
+</td></tr>
+<tr><td class="val" id="transform_glyph">transform_glyph</td><td class="desc">
+<p>A method used to transform the image that is in a given glyph slot.</p>
+</td></tr>
+<tr><td class="val" id="get_glyph_cbox">get_glyph_cbox</td><td class="desc">
+<p>A method used to access the glyph's cbox.</p>
+</td></tr>
+<tr><td class="val" id="set_mode">set_mode</td><td class="desc">
+<p>A method used to pass additional parameters.</p>
+</td></tr>
+<tr><td class="val" id="raster_class">raster_class</td><td class="desc">
+<p>For <code><a href="ft2-basic_types.html#ft_glyph_format">FT_GLYPH_FORMAT_OUTLINE</a></code> renderers only. This is a pointer to its raster's class.</p>
+</td></tr>
+</table>
+
+<hr>
+
+<h2 id="ft_get_renderer">FT_Get_Renderer<a class="headerlink" href="#ft_get_renderer" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_RENDER_H (freetype/ftrender.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-module_management.html#ft_renderer">FT_Renderer</a> )
+ <b>FT_Get_Renderer</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <a href="ft2-basic_types.html#ft_glyph_format">FT_Glyph_Format</a> format );
+</code></pre></div>
+
+<p>Retrieve the current renderer for a given glyph format.</p>
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to the library object.</p>
+</td></tr>
+<tr><td class="val" id="format">format</td><td class="desc">
+<p>The glyph format.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>A renderer handle. 0&nbsp;if none found.</p>
+<h4>note</h4>
+
+<p>An error will be returned if a module already exists by that name, or if the module requires a version of FreeType that is too great.</p>
+<p>To add a new renderer, simply use <code><a href="ft2-module_management.html#ft_add_module">FT_Add_Module</a></code>. To retrieve a renderer by its name, use <code><a href="ft2-module_management.html#ft_get_module">FT_Get_Module</a></code>.</p>
+<hr>
+
+<h2 id="ft_set_renderer">FT_Set_Renderer<a class="headerlink" href="#ft_set_renderer" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_RENDER_H (freetype/ftrender.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Set_Renderer</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <a href="ft2-module_management.html#ft_renderer">FT_Renderer</a> renderer,
+ <a href="ft2-basic_types.html#ft_uint">FT_UInt</a> num_params,
+ <a href="ft2-base_interface.html#ft_parameter">FT_Parameter</a>* parameters );
+</code></pre></div>
+
+<p>Set the current renderer to use, and set additional mode.</p>
+<h4>inout</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to the library object.</p>
+</td></tr>
+</table>
+
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="renderer">renderer</td><td class="desc">
+<p>A handle to the renderer object.</p>
+</td></tr>
+<tr><td class="val" id="num_params">num_params</td><td class="desc">
+<p>The number of additional parameters.</p>
+</td></tr>
+<tr><td class="val" id="parameters">parameters</td><td class="desc">
+<p>Additional parameters.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>In case of success, the renderer will be used to convert glyph images in the renderer's known format into bitmaps.</p>
+<p>This doesn't change the current renderer for other formats.</p>
+<p>Currently, no FreeType renderer module uses <code>parameters</code>; you should thus always pass <code>NULL</code> as the value.</p>
+<hr>
+
+<h2 id="ft_set_debug_hook">FT_Set_Debug_Hook<a class="headerlink" href="#ft_set_debug_hook" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> )
+ <b>FT_Set_Debug_Hook</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <a href="ft2-basic_types.html#ft_uint">FT_UInt</a> hook_index,
+ <a href="ft2-module_management.html#ft_debughook_func">FT_DebugHook_Func</a> debug_hook );
+</code></pre></div>
+
+<p>Set a debug hook function for debugging the interpreter of a font format.</p>
+<p>While this is a public API function, an application needs access to FreeType's internal header files to do something useful.</p>
+<p>Have a look at the source code of the <code>ttdebug</code> FreeType demo program for an example of its usage.</p>
+<h4>inout</h4>
+
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to the library object.</p>
+</td></tr>
+</table>
+
+<h4>input</h4>
+
+<table class="fields">
+<tr><td class="val" id="hook_index">hook_index</td><td class="desc">
+<p>The index of the debug hook. You should use defined enumeration macros like <code><a href="ft2-module_management.html#ft_debug_hook_xxx">FT_DEBUG_HOOK_TRUETYPE</a></code>.</p>
+</td></tr>
+<tr><td class="val" id="debug_hook">debug_hook</td><td class="desc">
+<p>The function used to debug the interpreter.</p>
+</td></tr>
+</table>
+
+<h4>note</h4>
+
+<p>Currently, four debug hook slots are available, but only one (for the TrueType interpreter) is defined.</p>
+<hr>
+
+<h2 id="ft_driver">FT_Driver<a class="headerlink" href="#ft_driver" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
+<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_DriverRec_* <b>FT_Driver</b>;
+</code></pre></div>
+
+<p>A handle to a given FreeType font driver object. A font driver is a module capable of creating faces from font files.</p>
+<hr>
+
+<h2 id="ft_debughook_func">FT_DebugHook_Func<a class="headerlink" href="#ft_debughook_func" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.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_DebugHook_Func</b>)( <span class="keyword">void</span>* arg );
+</code></pre></div>
+
+<p>A drop-in replacement (or rather a wrapper) for the bytecode or charstring interpreter's main loop function.</p>
+<p>Its job is essentially</p>
+<ul>
+<li>
+<p>to activate debug mode to enforce single-stepping,</p>
+</li>
+<li>
+<p>to call the main loop function to interpret the next opcode, and</p>
+</li>
+<li>
+<p>to show the changed context to the user.</p>
+</li>
+</ul>
+<p>An example for such a main loop function is <code>TT_RunIns</code> (declared in FreeType's internal header file <code>src/truetype/ttinterp.h</code>).</p>
+<p>Have a look at the source code of the <code>ttdebug</code> FreeType demo program for an example of a drop-in replacement.</p>
+<h4>inout</h4>
+
+<table class="fields">
+<tr><td class="val" id="arg">arg</td><td class="desc">
+<p>A typeless pointer, to be cast to the main loop function's data structure (which depends on the font module). For TrueType fonts it is bytecode interpreter's execution context, <code>TT_ExecContext</code>, which is declared in FreeType's internal header file <code>tttypes.h</code>.</p>
+</td></tr>
+</table>
+
+<hr>
+
+<h2 id="ft_debug_hook_xxx">FT_DEBUG_HOOK_XXX<a class="headerlink" href="#ft_debug_hook_xxx" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MODULE_H (freetype/ftmodapi.h).</p>
+<div class = "codehilite"><pre><code>#<span class="keyword">define</span> <a href="ft2-module_management.html#ft_debug_hook_truetype">FT_DEBUG_HOOK_TRUETYPE</a> 0
+</code></pre></div>
+
+<p>A list of named debug hook indices.</p>
+<h4>values</h4>
+
+<table class="fields">
+<tr><td class="val" id="ft_debug_hook_truetype">FT_DEBUG_HOOK_TRUETYPE</td><td class="desc">
+<p>This hook index identifies the TrueType bytecode debugger.</p>
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