Imported Upstream version 2.10.4
[platform/upstream/freetype2.git] / docs / reference / ft2-gasp_table.html
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-<h1>FreeType-2.8 API Reference</h1>
-
-<h1 id="gasp_table">Gasp Table</h1>
-<h2>Synopsis</h2>
-<table class="synopsis">
-<tr><td><a href="#FT_GASP_XXX">FT_GASP_XXX</a></td><td><a href="#FT_Get_Gasp">FT_Get_Gasp</a></td><td></td><td></td><td></td><td></td></tr>
-</table>
 
 
-<p>The function <a href="ft2-gasp_table.html#FT_Get_Gasp">FT_Get_Gasp</a> can be used to query a TrueType or OpenType font for specific entries in its &lsquo;gasp&rsquo; table, if any. This is mainly useful when implementing native TrueType hinting with the bytecode interpreter to duplicate the Windows text rendering results.</p>
 
-<div class="section">
-<h3 id="FT_GASP_XXX">FT_GASP_XXX</h3>
-<p>Defined in FT_GASP_H (freetype/ftgasp.h).</p>
-<pre>
-#define <a href="ft2-gasp_table.html#FT_GASP_NO_TABLE">FT_GASP_NO_TABLE</a>               -1
-#define <a href="ft2-gasp_table.html#FT_GASP_DO_GRIDFIT">FT_GASP_DO_GRIDFIT</a>           0x01
-#define <a href="ft2-gasp_table.html#FT_GASP_DO_GRAY">FT_GASP_DO_GRAY</a>              0x02
-#define <a href="ft2-gasp_table.html#FT_GASP_SYMMETRIC_GRIDFIT">FT_GASP_SYMMETRIC_GRIDFIT</a>    0x04
-#define <a href="ft2-gasp_table.html#FT_GASP_SYMMETRIC_SMOOTHING">FT_GASP_SYMMETRIC_SMOOTHING</a>  0x08
-</pre>
 
-<p>A list of values and/or bit-flags returned by the <a href="ft2-gasp_table.html#FT_Get_Gasp">FT_Get_Gasp</a> function.</p>
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+          
+          
+          
+
+
+  <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" 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-font_formats.html" title="Font Formats" class="md-nav__link">
+      Font Formats
+    </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">
+        Gasp Table
+      </label>
+    
+    <a href="ft2-gasp_table.html" title="Gasp Table" class="md-nav__link md-nav__link--active">
+      Gasp Table
+    </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_gasp_xxx" class="md-nav__link">
+    FT_GASP_XXX
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#ft_get_gasp" class="md-nav__link">
+    FT_Get_Gasp
+  </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">
+        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-cff_driver.html" title="The CFF driver" 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-tt_driver.html" title="The TrueType driver" 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-properties.html" title="Driver properties" class="md-nav__link">
+      Driver properties
+    </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-lcd_rendering.html" title="Subpixel Rendering" class="md-nav__link">
+      Subpixel Rendering
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+      <input class="md-toggle md-nav__toggle" data-md-toggle="nav-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">
+        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>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+      <input class="md-toggle md-nav__toggle" data-md-toggle="nav-8" type="checkbox" id="nav-8">
+    
+    <label class="md-nav__link" for="nav-8">
+      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>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-computations.html" title="Computations" class="md-nav__link">
+      Computations
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-list_processing.html" title="List Processing" class="md-nav__link">
+      List Processing
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-outline_processing.html" title="Outline Processing" class="md-nav__link">
+      Outline Processing
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-quick_advance.html" title="Quick retrieval of advance values" class="md-nav__link">
+      Quick retrieval of advance values
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-bitmap_handling.html" title="Bitmap Handling" class="md-nav__link">
+      Bitmap Handling
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-raster.html" title="Scanline Converter" class="md-nav__link">
+      Scanline Converter
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-glyph_stroker.html" title="Glyph Stroker" class="md-nav__link">
+      Glyph Stroker
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-system_interface.html" title="System Interface" class="md-nav__link">
+      System Interface
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-module_management.html" title="Module Management" class="md-nav__link">
+      Module Management
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-gzip.html" title="GZIP Streams" class="md-nav__link">
+      GZIP Streams
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-lzw.html" title="LZW Streams" class="md-nav__link">
+      LZW Streams
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-bzip2.html" title="BZIP2 Streams" class="md-nav__link">
+      BZIP2 Streams
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+      <input class="md-toggle md-nav__toggle" data-md-toggle="nav-9" type="checkbox" id="nav-9">
+    
+    <label class="md-nav__link" for="nav-9">
+      Error Codes
+    </label>
+    <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
+      <label class="md-nav__title" for="nav-9">
+        Error Codes
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-error_enumerations.html" title="Error Enumerations" class="md-nav__link">
+      Error Enumerations
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-error_code_values.html" title="Error Code Values" class="md-nav__link">
+      Error Code Values
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+      <input class="md-toggle md-nav__toggle" data-md-toggle="nav-10" type="checkbox" id="nav-10">
+    
+    <label class="md-nav__link" for="nav-10">
+      Miscellaneous
+    </label>
+    <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
+      <label class="md-nav__title" for="nav-10">
+        Miscellaneous
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-gx_validation.html" title="TrueTypeGX/AAT Validation" class="md-nav__link">
+      TrueTypeGX/AAT Validation
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-incremental.html" title="Incremental Loading" class="md-nav__link">
+      Incremental Loading
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-truetype_engine.html" title="The TrueType Engine" class="md-nav__link">
+      The TrueType Engine
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="ft2-ot_validation.html" title="OpenType Validation" class="md-nav__link">
+      OpenType Validation
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+    
+  </ul>
+</nav>
+                  </div>
+                </div>
+              </div>
+            
+            
+              <div class="md-sidebar md-sidebar--secondary" data-md-component="toc">
+                <div class="md-sidebar__scrollwrap">
+                  <div class="md-sidebar__inner">
+                    
+<nav class="md-nav md-nav--secondary">
+  
+  
+    
+  
+  
+    <label class="md-nav__title" for="__toc">Table of contents</label>
+    <ul class="md-nav__list" data-md-scrollfix>
+      
+        <li class="md-nav__item">
+  <a href="#synopsis" class="md-nav__link">
+    Synopsis
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#ft_gasp_xxx" class="md-nav__link">
+    FT_GASP_XXX
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#ft_get_gasp" class="md-nav__link">
+    FT_Get_Gasp
+  </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#format-specific-api">Format-Specific API</a> &raquo; Gasp Table</p>
+<hr />
+<h1 id="gasp-table">Gasp Table<a class="headerlink" href="#gasp-table" title="Permanent link">&para;</a></h1>
+<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">&para;</a></h2>
+<p>The function <code><a href="ft2-gasp_table.html#ft_get_gasp">FT_Get_Gasp</a></code> can be used to query a TrueType or OpenType font for specific entries in its &lsquo;gasp&rsquo; table, if any. This is mainly useful when implementing native TrueType hinting with the bytecode interpreter to duplicate the Windows text rendering results.</p>
+<h2 id="ft_gasp_xxx">FT_GASP_XXX<a class="headerlink" href="#ft_gasp_xxx" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_GASP_H (freetype/ftgasp.h).</p>
+<div class = "codehilite"><pre><code>#<span class="keyword">define</span> <a href="ft2-gasp_table.html#ft_gasp_no_table">FT_GASP_NO_TABLE</a>               -1
+#<span class="keyword">define</span> <a href="ft2-gasp_table.html#ft_gasp_do_gridfit">FT_GASP_DO_GRIDFIT</a>           0x01
+#<span class="keyword">define</span> <a href="ft2-gasp_table.html#ft_gasp_do_gray">FT_GASP_DO_GRAY</a>              0x02
+#<span class="keyword">define</span> <a href="ft2-gasp_table.html#ft_gasp_symmetric_gridfit">FT_GASP_SYMMETRIC_GRIDFIT</a>    0x04
+#<span class="keyword">define</span> <a href="ft2-gasp_table.html#ft_gasp_symmetric_smoothing">FT_GASP_SYMMETRIC_SMOOTHING</a>  0x08
+</code></pre></div>
+
+<p>A list of values and/or bit-flags returned by the <code><a href="ft2-gasp_table.html#ft_get_gasp">FT_Get_Gasp</a></code> function.</p>
 <h4>values</h4>
-<table class="fields">
-<tr><td class="val" id="FT_GASP_NO_TABLE">FT_GASP_NO_TABLE</td><td class="desc">
+
+<table class="fields long">
+<tr><td class="val" id="ft_gasp_no_table">FT_GASP_NO_TABLE</td><td class="desc">
 <p>This special value means that there is no GASP table in this face. It is up to the client to decide what to do.</p>
 </td></tr>
-<tr><td class="val" id="FT_GASP_DO_GRIDFIT">FT_GASP_DO_GRIDFIT</td><td class="desc">
-<p>Grid-fitting and hinting should be performed at the specified ppem. This <b>really</b> means TrueType bytecode interpretation. If this bit is not set, no hinting gets applied.</p>
+<tr><td class="val" id="ft_gasp_do_gridfit">FT_GASP_DO_GRIDFIT</td><td class="desc">
+<p>Grid-fitting and hinting should be performed at the specified ppem. This <strong>really</strong> means TrueType bytecode interpretation. If this bit is not set, no hinting gets applied.</p>
 </td></tr>
-<tr><td class="val" id="FT_GASP_DO_GRAY">FT_GASP_DO_GRAY</td><td class="desc">
+<tr><td class="val" id="ft_gasp_do_gray">FT_GASP_DO_GRAY</td><td class="desc">
 <p>Anti-aliased rendering should be performed at the specified ppem. If not set, do monochrome rendering.</p>
 </td></tr>
-<tr><td class="val" id="FT_GASP_SYMMETRIC_SMOOTHING">FT_GASP_SYMMETRIC_SMOOTHING</td><td class="desc">
+<tr><td class="val" id="ft_gasp_symmetric_smoothing">FT_GASP_SYMMETRIC_SMOOTHING</td><td class="desc">
 <p>If set, smoothing along multiple axes must be used with ClearType.</p>
 </td></tr>
-<tr><td class="val" id="FT_GASP_SYMMETRIC_GRIDFIT">FT_GASP_SYMMETRIC_GRIDFIT</td><td class="desc">
+<tr><td class="val" id="ft_gasp_symmetric_gridfit">FT_GASP_SYMMETRIC_GRIDFIT</td><td class="desc">
 <p>Grid-fitting must be used with ClearType's symmetric smoothing.</p>
 </td></tr>
 </table>
 
 <h4>note</h4>
-<p>The bit-flags &lsquo;FT_GASP_DO_GRIDFIT&rsquo; and &lsquo;FT_GASP_DO_GRAY&rsquo; are to be used for standard font rasterization only. Independently of that, &lsquo;FT_GASP_SYMMETRIC_SMOOTHING&rsquo; and &lsquo;FT_GASP_SYMMETRIC_GRIDFIT&rsquo; are to be used if ClearType is enabled (and &lsquo;FT_GASP_DO_GRIDFIT&rsquo; and &lsquo;FT_GASP_DO_GRAY&rsquo; are consequently ignored).</p>
-<p>&lsquo;ClearType&rsquo; is Microsoft's implementation of LCD rendering, partly protected by patents.</p>
 
+<p>The bit-flags <code>FT_GASP_DO_GRIDFIT</code> and <code>FT_GASP_DO_GRAY</code> are to be used for standard font rasterization only. Independently of that, <code>FT_GASP_SYMMETRIC_SMOOTHING</code> and <code>FT_GASP_SYMMETRIC_GRIDFIT</code> are to be used if ClearType is enabled (and <code>FT_GASP_DO_GRIDFIT</code> and <code>FT_GASP_DO_GRAY</code> are consequently ignored).</p>
+<p>&lsquo;ClearType&rsquo; is Microsoft's implementation of LCD rendering, partly protected by patents.</p>
 <h4>since</h4>
-<p>2.3.0</p>
 
+<p>2.3.0</p>
 <hr>
-<table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="middle">[<a href="#">Top</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table></div>
 
-<div class="section">
-<h3 id="FT_Get_Gasp">FT_Get_Gasp</h3>
+<h2 id="ft_get_gasp">FT_Get_Gasp<a class="headerlink" href="#ft_get_gasp" title="Permanent link">&para;</a></h2>
 <p>Defined in FT_GASP_H (freetype/ftgasp.h).</p>
-<pre>
-  FT_EXPORT( <a href="ft2-basic_types.html#FT_Int">FT_Int</a> )
-  <b>FT_Get_Gasp</b>( <a href="ft2-base_interface.html#FT_Face">FT_Face</a>  face,
-               <a href="ft2-basic_types.html#FT_UInt">FT_UInt</a>  ppem );
-</pre>
+<div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_int">FT_Int</a> )
+  <b>FT_Get_Gasp</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>  face,
+               <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>  ppem );
+</code></pre></div>
 
 <p>For a TrueType or OpenType font file, return the rasterizer behaviour flags from the font's &lsquo;gasp&rsquo; table corresponding to a given character pixel size.</p>
-
 <h4>input</h4>
+
 <table class="fields">
 <tr><td class="val" id="face">face</td><td class="desc">
 <p>The source face handle.</p>
 </table>
 
 <h4>return</h4>
-<p>Bit flags (see <a href="ft2-gasp_table.html#FT_GASP_XXX">FT_GASP_XXX</a>), or <a href="ft2-gasp_table.html#FT_GASP_XXX">FT_GASP_NO_TABLE</a> if there is no &lsquo;gasp&rsquo; table in the face.</p>
 
+<p>Bit flags (see <code><a href="ft2-gasp_table.html#ft_gasp_xxx">FT_GASP_XXX</a></code>), or <code><a href="ft2-gasp_table.html#ft_gasp_xxx">FT_GASP_NO_TABLE</a></code> if there is no &lsquo;gasp&rsquo; table in the face.</p>
 <h4>note</h4>
-<p>If you want to use the MM functionality of OpenType variation fonts (i.e., using <a href="ft2-multiple_masters.html#FT_Set_Var_Design_Coordinates">FT_Set_Var_Design_Coordinates</a> and friends), call this function <b>after</b> setting an instance since the return values can change.</p>
 
+<p>If you want to use the MM functionality of OpenType variation fonts (i.e., using <code><a href="ft2-multiple_masters.html#ft_set_var_design_coordinates">FT_Set_Var_Design_Coordinates</a></code> and friends), call this function <strong>after</strong> setting an instance since the return values can change.</p>
 <h4>since</h4>
-<p>2.3.0</p>
 
+<p>2.3.0</p>
 <hr>
-<table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="middle">[<a href="#">Top</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table></div>
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