Imported Upstream version 2.13.2
[platform/upstream/freetype2.git] / docs / reference / ft2-multiple_masters.html
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-        <title>Multiple Masters - FreeType-2.10.4 API Reference</title>
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-      Glyph Management
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-character_mapping.html" class="md-nav__link">
+        Character Mapping
+      </a>
+    </li>
+  
 
-        
           
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-mac_specific.html" title="Mac Specific Interface" class="md-nav__link">
-      Mac Specific Interface
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-information_retrieval.html" class="md-nav__link">
+        Information Retrieval
+      </a>
+    </li>
+  
 
-        
           
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-sizes_management.html" title="Size Management" class="md-nav__link">
-      Size Management
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-other_api_data.html" class="md-nav__link">
+        Other API Data
+      </a>
+    </li>
+  
 
-        
           
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-header_file_macros.html" title="Header File Macros" class="md-nav__link">
-      Header File Macros
-    </a>
-  </li>
+        </ul>
+      </nav>
+    </li>
+  
 
-        
-      </ul>
-    </nav>
-  </li>
+    
+      
+      
+      
 
+  
+  
+  
     
+    <li class="md-nav__item md-nav__item--nested">
       
       
+        <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_5" type="checkbox" id="__nav_5" >
       
+      <label class="md-nav__link" for="__nav_5">
+        Extended API
+        <span class="md-nav__icon md-icon"></span>
+      </label>
+      <nav class="md-nav" aria-label="Extended API" data-md-level="1">
+        <label class="md-nav__title" for="__nav_5">
+          <span class="md-nav__icon md-icon"></span>
+          Extended API
+        </label>
+        <ul class="md-nav__list" data-md-scrollfix>
+          
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-glyph_variants.html" class="md-nav__link">
+        Unicode Variation Sequences
+      </a>
+    </li>
+  
 
+          
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-color_management.html" class="md-nav__link">
+        Glyph Color Management
+      </a>
+    </li>
   
 
+          
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-layer_management.html" class="md-nav__link">
+        Glyph Layer Management
+      </a>
+    </li>
+  
 
-  <li class="md-nav__item md-nav__item--active md-nav__item--nested">
-    
-      <input class="md-toggle md-nav__toggle" data-md-toggle="nav-5" type="checkbox" id="nav-5" checked>
-    
-    <label class="md-nav__link" for="nav-5">
-      Format-Specific API
-    </label>
-    <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
-      <label class="md-nav__title" for="nav-5">
-        Format-Specific API
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
           
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-glyph_management.html" class="md-nav__link">
+        Glyph Management
+      </a>
+    </li>
+  
+
           
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-mac_specific.html" class="md-nav__link">
+        Mac Specific Interface
+      </a>
+    </li>
+  
+
           
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-sizes_management.html" class="md-nav__link">
+        Size Management
+      </a>
+    </li>
+  
 
+          
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-header_file_macros.html" class="md-nav__link">
+        Header File Macros
+      </a>
+    </li>
   
 
+          
+        </ul>
+      </nav>
+    </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">
-        Multiple Masters
+    <li class="md-nav__item md-nav__item--active md-nav__item--nested">
+      
+      
+        <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_6" type="checkbox" id="__nav_6" checked>
+      
+      <label class="md-nav__link" for="__nav_6">
+        Format-Specific API
+        <span class="md-nav__icon md-icon"></span>
       </label>
+      <nav class="md-nav" aria-label="Format-Specific API" data-md-level="1">
+        <label class="md-nav__title" for="__nav_6">
+          <span class="md-nav__icon md-icon"></span>
+          Format-Specific API
+        </label>
+        <ul class="md-nav__list" data-md-scrollfix>
+          
+            
+  
+  
     
-    <a href="ft2-multiple_masters.html" title="Multiple Masters" class="md-nav__link md-nav__link--active">
-      Multiple Masters
-    </a>
-    
+  
+  
+    <li class="md-nav__item md-nav__item--active">
+      
+      <input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc">
+      
+      
+        
+      
+      
+        <label class="md-nav__link md-nav__link--active" for="__toc">
+          Multiple Masters
+          <span class="md-nav__icon md-icon"></span>
+        </label>
+      
+      <a href="ft2-multiple_masters.html" class="md-nav__link md-nav__link--active">
+        Multiple Masters
+      </a>
       
-<nav class="md-nav md-nav--secondary">
+        
+<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
+  
   
   
     
   
   
-    <label class="md-nav__title" for="__toc">Table of contents</label>
-    <ul class="md-nav__list" data-md-scrollfix>
+    <label class="md-nav__title" for="__toc">
+      <span class="md-nav__icon md-icon"></span>
+      Table of contents
+    </label>
+    <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
       
         <li class="md-nav__item">
   <a href="#synopsis" class="md-nav__link">
   
 </li>
       
-      
-      
-      
+        <li class="md-nav__item">
+  <a href="#ft_get_default_named_instance" class="md-nav__link">
+    FT_Get_Default_Named_Instance
+  </a>
+  
+</li>
       
     </ul>
   
 </nav>
-    
-  </li>
+      
+    </li>
+  
 
-        
           
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-truetype_tables.html" title="TrueType Tables" class="md-nav__link">
-      TrueType Tables
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-truetype_tables.html" class="md-nav__link">
+        TrueType Tables
+      </a>
+    </li>
+  
 
-        
-          
           
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-type1_tables.html" title="Type 1 Tables" class="md-nav__link">
-      Type 1 Tables
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-type1_tables.html" class="md-nav__link">
+        Type 1 Tables
+      </a>
+    </li>
+  
 
-        
-          
           
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-sfnt_names.html" title="SFNT Names" class="md-nav__link">
-      SFNT Names
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-sfnt_names.html" class="md-nav__link">
+        SFNT Names
+      </a>
+    </li>
+  
 
-        
-          
-          
           
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-bdf_fonts.html" class="md-nav__link">
+        BDF and PCF Files
+      </a>
+    </li>
+  
 
-
-  <li class="md-nav__item">
-    <a href="ft2-bdf_fonts.html" title="BDF and PCF Files" class="md-nav__link">
-      BDF and PCF Files
-    </a>
-  </li>
-
-        
-          
-          
           
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-cid_fonts.html" class="md-nav__link">
+        CID Fonts
+      </a>
+    </li>
+  
 
-
-  <li class="md-nav__item">
-    <a href="ft2-cid_fonts.html" title="CID Fonts" class="md-nav__link">
-      CID Fonts
-    </a>
-  </li>
-
-        
-          
-          
           
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-pfr_fonts.html" class="md-nav__link">
+        PFR Fonts
+      </a>
+    </li>
+  
 
-
-  <li class="md-nav__item">
-    <a href="ft2-pfr_fonts.html" title="PFR Fonts" class="md-nav__link">
-      PFR Fonts
-    </a>
-  </li>
-
-        
-          
           
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-winfnt_fonts.html" title="Window FNT Files" class="md-nav__link">
-      Window FNT Files
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-winfnt_fonts.html" class="md-nav__link">
+        Window FNT Files
+      </a>
+    </li>
+  
 
-        
-          
           
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-font_formats.html" title="Font Formats" class="md-nav__link">
-      Font Formats
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-svg_fonts.html" class="md-nav__link">
+        OpenType SVG Fonts
+      </a>
+    </li>
+  
 
-        
-          
           
-          
-
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-font_formats.html" class="md-nav__link">
+        Font Formats
+      </a>
+    </li>
+  
 
-  <li class="md-nav__item">
-    <a href="ft2-gasp_table.html" title="Gasp Table" class="md-nav__link">
-      Gasp Table
-    </a>
-  </li>
+          
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-gasp_table.html" class="md-nav__link">
+        Gasp Table
+      </a>
+    </li>
+  
 
-        
-      </ul>
-    </nav>
-  </li>
+          
+        </ul>
+      </nav>
+    </li>
+  
 
     
       
       
       
 
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-      <input class="md-toggle md-nav__toggle" data-md-toggle="nav-6" type="checkbox" id="nav-6">
+  
+  
+  
     
-    <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">
+    <li class="md-nav__item md-nav__item--nested">
+      
+      
+        <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7" type="checkbox" id="__nav_7" >
+      
+      <label class="md-nav__link" for="__nav_7">
         Controlling FreeType Modules
+        <span class="md-nav__icon md-icon"></span>
       </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
+      <nav class="md-nav" aria-label="Controlling FreeType Modules" data-md-level="1">
+        <label class="md-nav__title" for="__nav_7">
+          <span class="md-nav__icon md-icon"></span>
+          Controlling FreeType Modules
+        </label>
+        <ul class="md-nav__list" data-md-scrollfix>
           
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-auto_hinter.html" title="The auto-hinter" class="md-nav__link">
-      The auto-hinter
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-auto_hinter.html" class="md-nav__link">
+        The auto-hinter
+      </a>
+    </li>
+  
 
-        
-          
           
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-cff_driver.html" title="The CFF driver" class="md-nav__link">
-      The CFF driver
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-cff_driver.html" class="md-nav__link">
+        The CFF driver
+      </a>
+    </li>
+  
 
-        
-          
           
-          
-
-
-  <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-t1_cid_driver.html" 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>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-tt_driver.html" class="md-nav__link">
+        The TrueType driver
+      </a>
+    </li>
+  
 
-        
           
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-pcf_driver.html" title="The PCF driver" class="md-nav__link">
-      The PCF driver
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-pcf_driver.html" class="md-nav__link">
+        The PCF driver
+      </a>
+    </li>
+  
 
-        
           
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-properties.html" title="Driver properties" class="md-nav__link">
-      Driver properties
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-ot_svg_driver.html" class="md-nav__link">
+        The SVG driver
+      </a>
+    </li>
+  
 
-        
-          
           
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-parameter_tags.html" title="Parameter Tags" class="md-nav__link">
-      Parameter Tags
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-properties.html" class="md-nav__link">
+        Driver properties
+      </a>
+    </li>
+  
 
-        
-          
           
-          
-
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-parameter_tags.html" class="md-nav__link">
+        Parameter Tags
+      </a>
+    </li>
+  
 
-  <li class="md-nav__item">
-    <a href="ft2-lcd_rendering.html" title="Subpixel Rendering" class="md-nav__link">
-      Subpixel Rendering
-    </a>
-  </li>
+          
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-lcd_rendering.html" class="md-nav__link">
+        Subpixel Rendering
+      </a>
+    </li>
+  
 
-        
-      </ul>
-    </nav>
-  </li>
+          
+        </ul>
+      </nav>
+    </li>
+  
 
     
       
       
       
 
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-      <input class="md-toggle md-nav__toggle" data-md-toggle="nav-7" type="checkbox" id="nav-7">
+  
+  
+  
     
-    <label class="md-nav__link" for="nav-7">
-      Cache Sub-System
-    </label>
-    <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
-      <label class="md-nav__title" for="nav-7">
+    <li class="md-nav__item md-nav__item--nested">
+      
+      
+        <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_8" type="checkbox" id="__nav_8" >
+      
+      <label class="md-nav__link" for="__nav_8">
         Cache Sub-System
+        <span class="md-nav__icon md-icon"></span>
       </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
+      <nav class="md-nav" aria-label="Cache Sub-System" data-md-level="1">
+        <label class="md-nav__title" for="__nav_8">
+          <span class="md-nav__icon md-icon"></span>
+          Cache Sub-System
+        </label>
+        <ul class="md-nav__list" data-md-scrollfix>
           
-          
-
-
-  <li class="md-nav__item">
-    <a href="ft2-cache_subsystem.html" title="Cache Sub-System" class="md-nav__link">
-      Cache Sub-System
-    </a>
-  </li>
+            
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="ft2-cache_subsystem.html" class="md-nav__link">
+        Cache Sub-System
+      </a>
+    </li>
+  
 
-        
-      </ul>
-    </nav>
-  </li>
+          
+        </ul>
+      </nav>
+    </li>
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 <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">&para;</a></h2>
 <p>The following types and functions are used to manage Multiple Master fonts, i.e., the selection of specific design instances by setting design axis coordinates.</p>
 <p>Besides Adobe MM fonts, the interface supports Apple's TrueType GX and OpenType variation fonts. Some of the routines only work with Adobe MM fonts, others will work with all three types. They are similar enough that a consistent interface makes sense.</p>
+<p>For Adobe MM fonts, macro <code><a href="ft2-font_testing_macros.html#ft_is_sfnt">FT_IS_SFNT</a></code> returns false. For GX and OpenType variation fonts, it returns true.</p>
 <h2 id="ft_mm_axis">FT_MM_Axis<a class="headerlink" href="#ft_mm_axis" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  <span class="keyword">typedef</span> <span class="keyword">struct</span>  FT_MM_Axis_
 <p>A structure to model a given axis in design space for Multiple Masters fonts.</p>
 <p>This structure can't be used for TrueType GX or OpenType variation fonts.</p>
 <h4>fields</h4>
-
 <table class="fields">
 <tr><td class="val" id="name">name</td><td class="desc">
 <p>The axis's name.</p>
 <p>A structure to model the axes and space of a Multiple Masters font.</p>
 <p>This structure can't be used for TrueType GX or OpenType variation fonts.</p>
 <h4>fields</h4>
-
 <table class="fields">
 <tr><td class="val" id="num_axis">num_axis</td><td class="desc">
 <p>Number of axes. Cannot exceed&nbsp;4.</p>
 
 <p>A structure to model a given axis in design space for Multiple Masters, TrueType GX, and OpenType variation fonts.</p>
 <h4>fields</h4>
-
 <table class="fields">
 <tr><td class="val" id="name">name</td><td class="desc">
 <p>The axis's name. Not always meaningful for TrueType GX or OpenType variation fonts.</p>
 
 <h4>note</h4>
 
-<p>The fields <code>minimum</code>, <code>def</code>, and <code>maximum</code> are 16.16 fractional values for TrueType GX and OpenType variation fonts. For Adobe MM fonts, the values are integers.</p>
+<p>The fields <code>minimum</code>, <code>def</code>, and <code>maximum</code> are 16.16 fractional values for TrueType GX and OpenType variation fonts. For Adobe MM fonts, the values are whole numbers (i.e., the fractional part is zero).</p>
 <hr>
 
 <h2 id="ft_var_named_style">FT_Var_Named_Style<a class="headerlink" href="#ft_var_named_style" title="Permanent link">&para;</a></h2>
 <p>A structure to model a named instance in a TrueType GX or OpenType variation font.</p>
 <p>This structure can't be used for Adobe MM fonts.</p>
 <h4>fields</h4>
-
 <table class="fields">
 <tr><td class="val" id="coords">coords</td><td class="desc">
 <p>The design coordinates for this instance. This is an array with one entry for each axis.</p>
 <p>A structure to model the axes and space of an Adobe MM, TrueType GX, or OpenType variation font.</p>
 <p>Some fields are specific to one format and not to the others.</p>
 <h4>fields</h4>
-
 <table class="fields">
 <tr><td class="val" id="num_axis">num_axis</td><td class="desc">
 <p>The number of axes. The maximum value is&nbsp;4 for Adobe MM fonts; no limit in TrueType GX or OpenType variation fonts.</p>
 <h2 id="ft_get_multi_master">FT_Get_Multi_Master<a class="headerlink" href="#ft_get_multi_master" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Get_Multi_Master</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>           face,
+  <b>FT_Get_Multi_Master</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>           face,
                        <a href="ft2-multiple_masters.html#ft_multi_master">FT_Multi_Master</a>  *amaster );
 </code></pre></div>
 
 <p>Retrieve a variation descriptor of a given Adobe MM font.</p>
 <p>This function can't be used with TrueType GX or OpenType variation fonts.</p>
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>A handle to the source face.</p>
 </table>
 
 <h4>output</h4>
-
 <table class="fields">
 <tr><td class="val" id="amaster">amaster</td><td class="desc">
 <p>The Multiple Masters descriptor.</p>
 <h2 id="ft_get_mm_var">FT_Get_MM_Var<a class="headerlink" href="#ft_get_mm_var" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Get_MM_Var</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>      face,
+  <b>FT_Get_MM_Var</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>      face,
                  <a href="ft2-multiple_masters.html#ft_mm_var">FT_MM_Var</a>*  *amaster );
 </code></pre></div>
 
 <p>Retrieve a variation descriptor for a given font.</p>
 <p>This function works with all supported variation formats.</p>
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>A handle to the source face.</p>
 </table>
 
 <h4>output</h4>
-
 <table class="fields">
 <tr><td class="val" id="amaster">amaster</td><td class="desc">
 <p>The variation descriptor. Allocates a data structure, which the user must deallocate with a call to <code><a href="ft2-multiple_masters.html#ft_done_mm_var">FT_Done_MM_Var</a></code> after use.</p>
 <h2 id="ft_done_mm_var">FT_Done_MM_Var<a class="headerlink" href="#ft_done_mm_var" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Done_MM_Var</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a>   library,
+  <b>FT_Done_MM_Var</b>( <a href="ft2-library_setup.html#ft_library">FT_Library</a>   library,
                   <a href="ft2-multiple_masters.html#ft_mm_var">FT_MM_Var</a>   *amaster );
 </code></pre></div>
 
 <p>Free the memory allocated by <code><a href="ft2-multiple_masters.html#ft_get_mm_var">FT_Get_MM_Var</a></code>.</p>
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="library">library</td><td class="desc">
 <p>A handle of the face's parent library object that was used in the call to <code><a href="ft2-multiple_masters.html#ft_get_mm_var">FT_Get_MM_Var</a></code> to create <code>amaster</code>.</p>
 <h2 id="ft_set_mm_design_coordinates">FT_Set_MM_Design_Coordinates<a class="headerlink" href="#ft_set_mm_design_coordinates" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Set_MM_Design_Coordinates</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>   face,
+  <b>FT_Set_MM_Design_Coordinates</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>   face,
                                 <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>   num_coords,
                                 <a href="ft2-basic_types.html#ft_long">FT_Long</a>*  coords );
 </code></pre></div>
 <p>For Adobe MM fonts, choose an interpolated font design through design coordinates.</p>
 <p>This function can't be used with TrueType GX or OpenType variation fonts.</p>
 <h4>inout</h4>
-
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>A handle to the source face.</p>
 </table>
 
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="num_coords">num_coords</td><td class="desc">
 <p>The number of available design coordinates. If it is larger than the number of axes, ignore the excess values. If it is smaller than the number of axes, use default values for the remaining axes.</p>
 <h4>note</h4>
 
 <p>[Since 2.8.1] To reset all axes to the default values, call the function with <code>num_coords</code> set to zero and <code>coords</code> set to <code>NULL</code>.</p>
-<p>[Since 2.9] If <code>num_coords</code> is larger than zero, this function sets the <code><a href="ft2-base_interface.html#ft_face_flag_xxx">FT_FACE_FLAG_VARIATION</a></code> bit in <code><a href="ft2-base_interface.html#ft_face">FT_Face</a></code>'s <code>face_flags</code> field (i.e., <code><a href="ft2-base_interface.html#ft_is_variation">FT_IS_VARIATION</a></code> will return true). If <code>num_coords</code> is zero, this bit flag gets unset.</p>
+<p>[Since 2.9] If <code>num_coords</code> is larger than zero, this function sets the <code><a href="ft2-face_creation.html#ft_face_flag_xxx">FT_FACE_FLAG_VARIATION</a></code> bit in <code><a href="ft2-face_creation.html#ft_face">FT_Face</a></code>'s <code>face_flags</code> field (i.e., <code><a href="ft2-font_testing_macros.html#ft_is_variation">FT_IS_VARIATION</a></code> will return true). If <code>num_coords</code> is zero, this bit flag gets unset.</p>
 <hr>
 
 <h2 id="ft_set_var_design_coordinates">FT_Set_Var_Design_Coordinates<a class="headerlink" href="#ft_set_var_design_coordinates" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Set_Var_Design_Coordinates</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>    face,
+  <b>FT_Set_Var_Design_Coordinates</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>    face,
                                  <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>    num_coords,
                                  <a href="ft2-basic_types.html#ft_fixed">FT_Fixed</a>*  coords );
 </code></pre></div>
 <p>Choose an interpolated font design through design coordinates.</p>
 <p>This function works with all supported variation formats.</p>
 <h4>inout</h4>
-
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>A handle to the source face.</p>
 </table>
 
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="num_coords">num_coords</td><td class="desc">
 <p>The number of available design coordinates. If it is larger than the number of axes, ignore the excess values. If it is smaller than the number of axes, use default values for the remaining axes.</p>
 <p>FreeType error code. 0&nbsp;means success.</p>
 <h4>note</h4>
 
+<p>The design coordinates are 16.16 fractional values for TrueType GX and OpenType variation fonts. For Adobe MM fonts, the values are supposed to be whole numbers (i.e., the fractional part is zero).</p>
 <p>[Since 2.8.1] To reset all axes to the default values, call the function with <code>num_coords</code> set to zero and <code>coords</code> set to <code>NULL</code>. [Since 2.9] &lsquo;Default values&rsquo; means the currently selected named instance (or the base font if no named instance is selected).</p>
-<p>[Since 2.9] If <code>num_coords</code> is larger than zero, this function sets the <code><a href="ft2-base_interface.html#ft_face_flag_xxx">FT_FACE_FLAG_VARIATION</a></code> bit in <code><a href="ft2-base_interface.html#ft_face">FT_Face</a></code>'s <code>face_flags</code> field (i.e., <code><a href="ft2-base_interface.html#ft_is_variation">FT_IS_VARIATION</a></code> will return true). If <code>num_coords</code> is zero, this bit flag gets unset.</p>
+<p>[Since 2.9] If <code>num_coords</code> is larger than zero, this function sets the <code><a href="ft2-face_creation.html#ft_face_flag_xxx">FT_FACE_FLAG_VARIATION</a></code> bit in <code><a href="ft2-face_creation.html#ft_face">FT_Face</a></code>'s <code>face_flags</code> field (i.e., <code><a href="ft2-font_testing_macros.html#ft_is_variation">FT_IS_VARIATION</a></code> will return true). If <code>num_coords</code> is zero, this bit flag gets unset.</p>
 <hr>
 
 <h2 id="ft_get_var_design_coordinates">FT_Get_Var_Design_Coordinates<a class="headerlink" href="#ft_get_var_design_coordinates" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Get_Var_Design_Coordinates</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>    face,
+  <b>FT_Get_Var_Design_Coordinates</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>    face,
                                  <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>    num_coords,
                                  <a href="ft2-basic_types.html#ft_fixed">FT_Fixed</a>*  coords );
 </code></pre></div>
 <p>Get the design coordinates of the currently selected interpolated font.</p>
 <p>This function works with all supported variation formats.</p>
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>A handle to the source face.</p>
 </table>
 
 <h4>output</h4>
-
 <table class="fields">
 <tr><td class="val" id="coords">coords</td><td class="desc">
 <p>The design coordinates array.</p>
 <h4>return</h4>
 
 <p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>The design coordinates are 16.16 fractional values for TrueType GX and OpenType variation fonts. For Adobe MM fonts, the values are whole numbers (i.e., the fractional part is zero).</p>
 <h4>since</h4>
 
 <p>2.7.1</p>
 <h2 id="ft_set_mm_blend_coordinates">FT_Set_MM_Blend_Coordinates<a class="headerlink" href="#ft_set_mm_blend_coordinates" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Set_MM_Blend_Coordinates</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>    face,
+  <b>FT_Set_MM_Blend_Coordinates</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>    face,
                                <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>    num_coords,
                                <a href="ft2-basic_types.html#ft_fixed">FT_Fixed</a>*  coords );
 </code></pre></div>
 <p>Choose an interpolated font design through normalized blend coordinates.</p>
 <p>This function works with all supported variation formats.</p>
 <h4>inout</h4>
-
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>A handle to the source face.</p>
 </table>
 
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="num_coords">num_coords</td><td class="desc">
 <p>The number of available design coordinates. If it is larger than the number of axes, ignore the excess values. If it is smaller than the number of axes, use default values for the remaining axes.</p>
 </td></tr>
 <tr><td class="val" id="coords">coords</td><td class="desc">
-<p>The design coordinates array (each element must be between 0 and 1.0 for Adobe MM fonts, and between -1.0 and 1.0 for TrueType GX and OpenType variation fonts).</p>
+<p>The design coordinates array. Each element is a 16.16 fractional value and must be between 0 and 1.0 for Adobe MM fonts, and between -1.0 and 1.0 for TrueType GX and OpenType variation fonts.</p>
 </td></tr>
 </table>
 
 <h4>note</h4>
 
 <p>[Since 2.8.1] To reset all axes to the default values, call the function with <code>num_coords</code> set to zero and <code>coords</code> set to <code>NULL</code>. [Since 2.9] &lsquo;Default values&rsquo; means the currently selected named instance (or the base font if no named instance is selected).</p>
-<p>[Since 2.9] If <code>num_coords</code> is larger than zero, this function sets the <code><a href="ft2-base_interface.html#ft_face_flag_xxx">FT_FACE_FLAG_VARIATION</a></code> bit in <code><a href="ft2-base_interface.html#ft_face">FT_Face</a></code>'s <code>face_flags</code> field (i.e., <code><a href="ft2-base_interface.html#ft_is_variation">FT_IS_VARIATION</a></code> will return true). If <code>num_coords</code> is zero, this bit flag gets unset.</p>
+<p>[Since 2.9] If <code>num_coords</code> is larger than zero, this function sets the <code><a href="ft2-face_creation.html#ft_face_flag_xxx">FT_FACE_FLAG_VARIATION</a></code> bit in <code><a href="ft2-face_creation.html#ft_face">FT_Face</a></code>'s <code>face_flags</code> field (i.e., <code><a href="ft2-font_testing_macros.html#ft_is_variation">FT_IS_VARIATION</a></code> will return true). If <code>num_coords</code> is zero, this bit flag gets unset.</p>
 <hr>
 
 <h2 id="ft_get_mm_blend_coordinates">FT_Get_MM_Blend_Coordinates<a class="headerlink" href="#ft_get_mm_blend_coordinates" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Get_MM_Blend_Coordinates</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>    face,
+  <b>FT_Get_MM_Blend_Coordinates</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>    face,
                                <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>    num_coords,
                                <a href="ft2-basic_types.html#ft_fixed">FT_Fixed</a>*  coords );
 </code></pre></div>
 <p>Get the normalized blend coordinates of the currently selected interpolated font.</p>
 <p>This function works with all supported variation formats.</p>
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>A handle to the source face.</p>
 </table>
 
 <h4>output</h4>
-
 <table class="fields">
 <tr><td class="val" id="coords">coords</td><td class="desc">
-<p>The normalized blend coordinates array.</p>
+<p>The normalized blend coordinates array (as 16.16 fractional values).</p>
 </td></tr>
 </table>
 
 <h2 id="ft_set_var_blend_coordinates">FT_Set_Var_Blend_Coordinates<a class="headerlink" href="#ft_set_var_blend_coordinates" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Set_Var_Blend_Coordinates</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>    face,
+  <b>FT_Set_Var_Blend_Coordinates</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>    face,
                                 <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>    num_coords,
                                 <a href="ft2-basic_types.html#ft_fixed">FT_Fixed</a>*  coords );
 </code></pre></div>
 <h2 id="ft_get_var_blend_coordinates">FT_Get_Var_Blend_Coordinates<a class="headerlink" href="#ft_get_var_blend_coordinates" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Get_Var_Blend_Coordinates</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>    face,
+  <b>FT_Get_Var_Blend_Coordinates</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>    face,
                                 <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>    num_coords,
                                 <a href="ft2-basic_types.html#ft_fixed">FT_Fixed</a>*  coords );
 </code></pre></div>
 <h2 id="ft_set_mm_weightvector">FT_Set_MM_WeightVector<a class="headerlink" href="#ft_set_mm_weightvector" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Set_MM_WeightVector</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>    face,
+  <b>FT_Set_MM_WeightVector</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>    face,
                           <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>    len,
                           <a href="ft2-basic_types.html#ft_fixed">FT_Fixed</a>*  weightvector );
 </code></pre></div>
 <p>For Adobe MM fonts, choose an interpolated font design by directly setting the weight vector.</p>
 <p>This function can't be used with TrueType GX or OpenType variation fonts.</p>
 <h4>inout</h4>
-
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>A handle to the source face.</p>
 </table>
 
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="len">len</td><td class="desc">
 <p>The length of the weight vector array. If it is larger than the number of designs, the extra values are ignored. If it is less than the number of designs, the remaining values are set to zero.</p>
 <p>FreeType error code. 0&nbsp;means success.</p>
 <h4>note</h4>
 
-<p>Adobe Multiple Master fonts limit the number of designs, and thus the length of the weight vector to&nbsp;16.</p>
-<p>If <code>len</code> is zero and <code>weightvector</code> is <code>NULL</code>, the weight vector array is reset to the default values.</p>
+<p>Adobe Multiple Master fonts limit the number of designs, and thus the length of the weight vector to 16&nbsp;elements.</p>
+<p>If <code>len</code> is larger than zero, this function sets the <code><a href="ft2-face_creation.html#ft_face_flag_xxx">FT_FACE_FLAG_VARIATION</a></code> bit in <code><a href="ft2-face_creation.html#ft_face">FT_Face</a></code>'s <code>face_flags</code> field (i.e., <code><a href="ft2-font_testing_macros.html#ft_is_variation">FT_IS_VARIATION</a></code> will return true). If <code>len</code> is zero, this bit flag is unset and the weight vector array is reset to the default values.</p>
 <p>The Adobe documentation also states that the values in the WeightVector array must total 1.0 &plusmn;&nbsp;0.001. In practice this does not seem to be enforced, so is not enforced here, either.</p>
 <h4>since</h4>
 
 <h2 id="ft_get_mm_weightvector">FT_Get_MM_WeightVector<a class="headerlink" href="#ft_get_mm_weightvector" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Get_MM_WeightVector</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>    face,
+  <b>FT_Get_MM_WeightVector</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>    face,
                           <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>*   len,
                           <a href="ft2-basic_types.html#ft_fixed">FT_Fixed</a>*  weightvector );
 </code></pre></div>
 <p>For Adobe MM fonts, retrieve the current weight vector of the font.</p>
 <p>This function can't be used with TrueType GX or OpenType variation fonts.</p>
 <h4>inout</h4>
-
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>A handle to the source face.</p>
 </table>
 
 <h4>output</h4>
-
 <table class="fields">
 <tr><td class="val" id="weightvector">weightvector</td><td class="desc">
 <p>An array to be filled.</p>
 
 <p>A list of bit flags used in the return value of <code><a href="ft2-multiple_masters.html#ft_get_var_axis_flags">FT_Get_Var_Axis_Flags</a></code>.</p>
 <h4>values</h4>
-
 <table class="fields">
 <tr><td class="val" id="ft_var_axis_flag_hidden">FT_VAR_AXIS_FLAG_HIDDEN</td><td class="desc">
 <p>The variation axis should not be exposed to user interfaces.</p>
 <p>Get the &lsquo;flags&rsquo; field of an OpenType Variation Axis Record.</p>
 <p>Not meaningful for Adobe MM fonts (<code>*flags</code> is always zero).</p>
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="master">master</td><td class="desc">
 <p>The variation descriptor.</p>
 </table>
 
 <h4>output</h4>
-
 <table class="fields">
 <tr><td class="val" id="flags">flags</td><td class="desc">
 <p>The &lsquo;flags&rsquo; field. See <code><a href="ft2-multiple_masters.html#ft_var_axis_flag_xxx">FT_VAR_AXIS_FLAG_XXX</a></code> for possible values.</p>
 <h2 id="ft_set_named_instance">FT_Set_Named_Instance<a class="headerlink" href="#ft_set_named_instance" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
-  <b>FT_Set_Named_Instance</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>  face,
+  <b>FT_Set_Named_Instance</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>  face,
                          <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>  instance_index );
 </code></pre></div>
 
 <p>Set or change the current named instance.</p>
 <h4>input</h4>
-
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>A handle to the source face.</p>
 <p>FreeType error code. 0&nbsp;means success.</p>
 <h4>note</h4>
 
-<p>The function uses the value of <code>instance_index</code> to set bits 16-30 of the face's <code>face_index</code> field. It also resets any variation applied to the font, and the <code><a href="ft2-base_interface.html#ft_face_flag_xxx">FT_FACE_FLAG_VARIATION</a></code> bit of the face's <code>face_flags</code> field gets reset to zero (i.e., <code><a href="ft2-base_interface.html#ft_is_variation">FT_IS_VARIATION</a></code> will return false).</p>
+<p>The function uses the value of <code>instance_index</code> to set bits 16-30 of the face's <code>face_index</code> field. It also resets any variation applied to the font, and the <code><a href="ft2-face_creation.html#ft_face_flag_xxx">FT_FACE_FLAG_VARIATION</a></code> bit of the face's <code>face_flags</code> field gets reset to zero (i.e., <code><a href="ft2-font_testing_macros.html#ft_is_variation">FT_IS_VARIATION</a></code> will return false).</p>
 <p>For Adobe MM fonts (which don't have named instances) this function simply resets the current face to the default instance.</p>
 <h4>since</h4>
 
 <p>2.9</p>
 <hr>
-                
-                  
-                
+
+<h2 id="ft_get_default_named_instance">FT_Get_Default_Named_Instance<a class="headerlink" href="#ft_get_default_named_instance" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_MULTIPLE_MASTERS_H (freetype/ftmm.h).</p>
+<div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+  <b>FT_Get_Default_Named_Instance</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a>   face,
+                                 <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>  *instance_index );
+</code></pre></div>
+
+<p>Retrieve the index of the default named instance, to be used with <code><a href="ft2-multiple_masters.html#ft_set_named_instance">FT_Set_Named_Instance</a></code>.</p>
+<p>The default instance of a variation font is that instance for which the nth axis coordinate is equal to <code>axis[n].def</code> (as specified in the <code><a href="ft2-multiple_masters.html#ft_mm_var">FT_MM_Var</a></code> structure), with&nbsp;n covering all axes.</p>
+<p>FreeType synthesizes a named instance for the default instance if the font does not contain such an entry.</p>
+<h4>input</h4>
+<table class="fields">
+<tr><td class="val" id="face">face</td><td class="desc">
+<p>A handle to the source face.</p>
+</td></tr>
+</table>
+
+<h4>output</h4>
+<table class="fields">
+<tr><td class="val" id="instance_index">instance_index</td><td class="desc">
+<p>The index of the default named instance.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>For Adobe MM fonts (which don't have named instances) this function always returns zero for <code>instance_index</code>.</p>
+<h4>since</h4>
+
+<p>2.13.1</p>
+<hr>
                 
               
               
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