docs/reference/ft2-gasp_table.html

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 540       <label class="md-nav__link md-nav__link--active" for="__toc">
 541         Gasp Table
 542       </label>
 543
 544     <a href="ft2-gasp_table.html" title="Gasp Table" class="md-nav__link md-nav__link--active">
 545       Gasp Table
 546     </a>
 547
 548
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 550
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 555     <label class="md-nav__title" for="__toc">Table of contents</label>
 556     <ul class="md-nav__list" data-md-scrollfix>
 557
 558         <li class="md-nav__item">
 559   <a href="#synopsis" class="md-nav__link">
 560     Synopsis
 561   </a>
 562
 563 </li>
 564
 565         <li class="md-nav__item">
 566   <a href="#ft_gasp_xxx" class="md-nav__link">
 567     FT_GASP_XXX
 568   </a>
 569
 570 </li>
 571
 572         <li class="md-nav__item">
 573   <a href="#ft_get_gasp" class="md-nav__link">
 574     FT_Get_Gasp
 575   </a>
 576
 577 </li>
 578
 579
 580
 581
 582
 583     </ul>
 584
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1056     <label class="md-nav__title" for="__toc">Table of contents</label>
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1058
1059         <li class="md-nav__item">
1060   <a href="#synopsis" class="md-nav__link">
1061     Synopsis
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1063
1064 </li>
1065
1066         <li class="md-nav__item">
1067   <a href="#ft_gasp_xxx" class="md-nav__link">
1068     FT_GASP_XXX
1069   </a>
1070
1071 </li>
1072
1073         <li class="md-nav__item">
1074   <a href="#ft_get_gasp" class="md-nav__link">
1075     FT_Get_Gasp
1076   </a>
1077
1078 </li>
1079
1080
1081
1082
1083
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1085
1086 </nav>
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1088                 </div>
1089               </div>
1090
1091
1092           <div class="md-content">
1093             <article class="md-content__inner md-typeset">
1094
1095
1096
1097                 <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>
1098 <hr />
1099 <h1 id="gasp-table">Gasp Table<a class="headerlink" href="#gasp-table" title="Permanent link">&para;</a></h1>
1100 <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">&para;</a></h2>
1101 <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>
1102 <h2 id="ft_gasp_xxx">FT_GASP_XXX<a class="headerlink" href="#ft_gasp_xxx" title="Permanent link">&para;</a></h2>
1103 <p>Defined in FT_GASP_H (freetype/ftgasp.h).</p>
1104 <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
1105 #<span class="keyword">define</span> <a href="ft2-gasp_table.html#ft_gasp_do_gridfit">FT_GASP_DO_GRIDFIT</a>           0x01
1106 #<span class="keyword">define</span> <a href="ft2-gasp_table.html#ft_gasp_do_gray">FT_GASP_DO_GRAY</a>              0x02
1107 #<span class="keyword">define</span> <a href="ft2-gasp_table.html#ft_gasp_symmetric_gridfit">FT_GASP_SYMMETRIC_GRIDFIT</a>    0x04
1108 #<span class="keyword">define</span> <a href="ft2-gasp_table.html#ft_gasp_symmetric_smoothing">FT_GASP_SYMMETRIC_SMOOTHING</a>  0x08
1109 </code></pre></div>
1110
1111 <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>
1112 <h4>values</h4>
1113
1114 <table class="fields long">
1115 <tr><td class="val" id="ft_gasp_no_table">FT_GASP_NO_TABLE</td><td class="desc">
1116 <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>
1117 </td></tr>
1118 <tr><td class="val" id="ft_gasp_do_gridfit">FT_GASP_DO_GRIDFIT</td><td class="desc">
1119 <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>
1120 </td></tr>
1121 <tr><td class="val" id="ft_gasp_do_gray">FT_GASP_DO_GRAY</td><td class="desc">
1122 <p>Anti-aliased rendering should be performed at the specified ppem. If not set, do monochrome rendering.</p>
1123 </td></tr>
1124 <tr><td class="val" id="ft_gasp_symmetric_smoothing">FT_GASP_SYMMETRIC_SMOOTHING</td><td class="desc">
1125 <p>If set, smoothing along multiple axes must be used with ClearType.</p>
1126 </td></tr>
1127 <tr><td class="val" id="ft_gasp_symmetric_gridfit">FT_GASP_SYMMETRIC_GRIDFIT</td><td class="desc">
1128 <p>Grid-fitting must be used with ClearType's symmetric smoothing.</p>
1129 </td></tr>
1130 </table>
1131
1132 <h4>note</h4>
1133
1134 <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>
1135 <p>&lsquo;ClearType&rsquo; is Microsoft's implementation of LCD rendering, partly protected by patents.</p>
1136 <h4>since</h4>
1137
1138 <p>2.3.0</p>
1139 <hr>
1140
1141 <h2 id="ft_get_gasp">FT_Get_Gasp<a class="headerlink" href="#ft_get_gasp" title="Permanent link">&para;</a></h2>
1142 <p>Defined in FT_GASP_H (freetype/ftgasp.h).</p>
1143 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_int">FT_Int</a> )
1144   <b>FT_Get_Gasp</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>  face,
1145                <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>  ppem );
1146 </code></pre></div>
1147
1148 <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>
1149 <h4>input</h4>
1150
1151 <table class="fields">
1152 <tr><td class="val" id="face">face</td><td class="desc">
1153 <p>The source face handle.</p>
1154 </td></tr>
1155 <tr><td class="val" id="ppem">ppem</td><td class="desc">
1156 <p>The vertical character pixel size.</p>
1157 </td></tr>
1158 </table>
1159
1160 <h4>return</h4>
1161
1162 <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>
1163 <h4>note</h4>
1164
1165 <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>
1166 <h4>since</h4>
1167
1168 <p>2.3.0</p>
1169 <hr>
1170
1171
1172
1173
1174
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1177
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