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<title>FreeType-2.6.3 API Reference</title>
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<table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table>
<h1>FreeType-2.6.3 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_SMOOTHING">FT_GASP_SYMMETRIC_SMOOTHING</a>  0x08
#define <a href="ft2-gasp_table.html#FT_GASP_SYMMETRIC_GRIDFIT">FT_GASP_SYMMETRIC_GRIDFIT</a>    0x10
</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>

<h4>values</h4>
<table class="fields">
<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>
</td></tr>
<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">
<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">
<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>

<h4>since</h4>
<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>
<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>

<p>Read the &lsquo;gasp&rsquo; table from a TrueType or OpenType font file and return the entry 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>
</td></tr>
<tr><td class="val" id="ppem">ppem</td><td class="desc">
<p>The vertical character pixel size.</p>
</td></tr>
</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>

<h4>since</h4>
<p>2.3.0</p>

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