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 647         Parameter Tags
 648       </label>
 649
 650     <a href="ft2-parameter_tags.html" title="Parameter Tags" class="md-nav__link md-nav__link--active">
 651       Parameter Tags
 652     </a>
 653
 654
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 656
 657
 658
 659
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 661     <label class="md-nav__title" for="__toc">Table of contents</label>
 662     <ul class="md-nav__list" data-md-scrollfix>
 663
 664         <li class="md-nav__item">
 665   <a href="#synopsis" title="Synopsis" class="md-nav__link">
 666     Synopsis
 667   </a>
 668
 669 </li>
 670
 671         <li class="md-nav__item">
 672   <a href="#ft_param_tag_ignore_typographic_family" title="FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY" class="md-nav__link">
 673     FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY
 674   </a>
 675
 676 </li>
 677
 678         <li class="md-nav__item">
 679   <a href="#ft_param_tag_ignore_typographic_subfamily" title="FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY" class="md-nav__link">
 680     FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY
 681   </a>
 682
 683 </li>
 684
 685         <li class="md-nav__item">
 686   <a href="#ft_param_tag_incremental" title="FT_PARAM_TAG_INCREMENTAL" class="md-nav__link">
 687     FT_PARAM_TAG_INCREMENTAL
 688   </a>
 689
 690 </li>
 691
 692         <li class="md-nav__item">
 693   <a href="#ft_param_tag_lcd_filter_weights" title="FT_PARAM_TAG_LCD_FILTER_WEIGHTS" class="md-nav__link">
 694     FT_PARAM_TAG_LCD_FILTER_WEIGHTS
 695   </a>
 696
 697 </li>
 698
 699         <li class="md-nav__item">
 700   <a href="#ft_param_tag_random_seed" title="FT_PARAM_TAG_RANDOM_SEED" class="md-nav__link">
 701     FT_PARAM_TAG_RANDOM_SEED
 702   </a>
 703
 704 </li>
 705
 706         <li class="md-nav__item">
 707   <a href="#ft_param_tag_stem_darkening" title="FT_PARAM_TAG_STEM_DARKENING" class="md-nav__link">
 708     FT_PARAM_TAG_STEM_DARKENING
 709   </a>
 710
 711 </li>
 712
 713         <li class="md-nav__item">
 714   <a href="#ft_param_tag_unpatented_hinting" title="FT_PARAM_TAG_UNPATENTED_HINTING" class="md-nav__link">
 715     FT_PARAM_TAG_UNPATENTED_HINTING
 716   </a>
 717
 718 </li>
 719
 720
 721
 722
 723
 724     </ul>
 725
 726 </nav>
 727
 728   </li>
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 736   <li class="md-nav__item">
 737     <a href="ft2-lcd_rendering.html" title="Subpixel Rendering" class="md-nav__link">
 738       Subpixel Rendering
 739     </a>
 740   </li>
 741
 742
 743       </ul>
 744     </nav>
 745   </li>
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 756
 757     <label class="md-nav__link" for="nav-7">
 758       Cache Sub-System
 759     </label>
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 772   <li class="md-nav__item">
 773     <a href="ft2-cache_subsystem.html" title="Cache Sub-System" class="md-nav__link">
 774       Cache Sub-System
 775     </a>
 776   </li>
 777
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 780     </nav>
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 794       Support API
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 808   <li class="md-nav__item">
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 810       Computations
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 821     <a href="ft2-list_processing.html" title="List Processing" class="md-nav__link">
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 834       Outline Processing
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 846       Quick retrieval of advance values
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 858       Bitmap Handling
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 882       Glyph Stroker
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 893     <a href="ft2-system_interface.html" title="System Interface" class="md-nav__link">
 894       System Interface
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 904   <li class="md-nav__item">
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 906       Module Management
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 917     <a href="ft2-gzip.html" title="GZIP Streams" class="md-nav__link">
 918       GZIP Streams
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 928   <li class="md-nav__item">
 929     <a href="ft2-lzw.html" title="LZW Streams" class="md-nav__link">
 930       LZW Streams
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 940   <li class="md-nav__item">
 941     <a href="ft2-bzip2.html" title="BZIP2 Streams" class="md-nav__link">
 942       BZIP2 Streams
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 960
 961     <label class="md-nav__link" for="nav-9">
 962       Error Codes
 963     </label>
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 966         Error Codes
 967       </label>
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 969
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 989     <a href="ft2-error_code_values.html" title="Error Code Values" class="md-nav__link">
 990       Error Code Values
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 994
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1006
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1008
1009     <label class="md-nav__link" for="nav-10">
1010       Miscellaneous
1011     </label>
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1014         Miscellaneous
1015       </label>
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1017
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1024   <li class="md-nav__item">
1025     <a href="ft2-ot_validation.html" title="OpenType Validation" class="md-nav__link">
1026       OpenType Validation
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1034
1035
1036   <li class="md-nav__item">
1037     <a href="ft2-incremental.html" title="Incremental Loading" class="md-nav__link">
1038       Incremental Loading
1039     </a>
1040   </li>
1041
1042
1043
1044
1045
1046
1047
1048   <li class="md-nav__item">
1049     <a href="ft2-truetype_engine.html" title="The TrueType Engine" class="md-nav__link">
1050       The TrueType Engine
1051     </a>
1052   </li>
1053
1054
1055
1056
1057
1058
1059
1060   <li class="md-nav__item">
1061     <a href="ft2-gx_validation.html" title="TrueTypeGX/AAT Validation" class="md-nav__link">
1062       TrueTypeGX/AAT Validation
1063     </a>
1064   </li>
1065
1066
1067       </ul>
1068     </nav>
1069   </li>
1070
1071
1072   </ul>
1073 </nav>
1074                   </div>
1075                 </div>
1076               </div>
1077
1078
1079               <div class="md-sidebar md-sidebar--secondary" data-md-component="toc">
1080                 <div class="md-sidebar__scrollwrap">
1081                   <div class="md-sidebar__inner">
1082
1083 <nav class="md-nav md-nav--secondary">
1084
1085
1086
1087
1088
1089     <label class="md-nav__title" for="__toc">Table of contents</label>
1090     <ul class="md-nav__list" data-md-scrollfix>
1091
1092         <li class="md-nav__item">
1093   <a href="#synopsis" title="Synopsis" class="md-nav__link">
1094     Synopsis
1095   </a>
1096
1097 </li>
1098
1099         <li class="md-nav__item">
1100   <a href="#ft_param_tag_ignore_typographic_family" title="FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY" class="md-nav__link">
1101     FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY
1102   </a>
1103
1104 </li>
1105
1106         <li class="md-nav__item">
1107   <a href="#ft_param_tag_ignore_typographic_subfamily" title="FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY" class="md-nav__link">
1108     FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY
1109   </a>
1110
1111 </li>
1112
1113         <li class="md-nav__item">
1114   <a href="#ft_param_tag_incremental" title="FT_PARAM_TAG_INCREMENTAL" class="md-nav__link">
1115     FT_PARAM_TAG_INCREMENTAL
1116   </a>
1117
1118 </li>
1119
1120         <li class="md-nav__item">
1121   <a href="#ft_param_tag_lcd_filter_weights" title="FT_PARAM_TAG_LCD_FILTER_WEIGHTS" class="md-nav__link">
1122     FT_PARAM_TAG_LCD_FILTER_WEIGHTS
1123   </a>
1124
1125 </li>
1126
1127         <li class="md-nav__item">
1128   <a href="#ft_param_tag_random_seed" title="FT_PARAM_TAG_RANDOM_SEED" class="md-nav__link">
1129     FT_PARAM_TAG_RANDOM_SEED
1130   </a>
1131
1132 </li>
1133
1134         <li class="md-nav__item">
1135   <a href="#ft_param_tag_stem_darkening" title="FT_PARAM_TAG_STEM_DARKENING" class="md-nav__link">
1136     FT_PARAM_TAG_STEM_DARKENING
1137   </a>
1138
1139 </li>
1140
1141         <li class="md-nav__item">
1142   <a href="#ft_param_tag_unpatented_hinting" title="FT_PARAM_TAG_UNPATENTED_HINTING" class="md-nav__link">
1143     FT_PARAM_TAG_UNPATENTED_HINTING
1144   </a>
1145
1146 </li>
1147
1148
1149
1150
1151
1152     </ul>
1153
1154 </nav>
1155                   </div>
1156                 </div>
1157               </div>
1158
1159
1160           <div class="md-content">
1161             <article class="md-content__inner md-typeset">
1162
1163
1164
1165                 <p><a href="https://www.freetype.org">FreeType</a> &raquo; <a href="../">Docs</a> &raquo; <a href="index.html#controlling-freetype-modules">Controlling FreeType Modules</a> &raquo; Parameter Tags</p>
1166 <hr />
1167 <h1 id="parameter-tags">Parameter Tags<a class="headerlink" href="#parameter-tags" title="Permanent link">&para;</a></h1>
1168 <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">&para;</a></h2>
1169 <p>This section contains macros for the <code><a href="ft2-base_interface.html#ft_parameter">FT_Parameter</a></code> structure that are used with various functions to activate some special functionality or different behaviour of various components of FreeType.</p>
1170 <h2 id="ft_param_tag_ignore_typographic_family">FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY<a class="headerlink" href="#ft_param_tag_ignore_typographic_family" title="Permanent link">&para;</a></h2>
1171 <div class = "codehilite">
1172 <pre>
1173 #<span class="keyword">define</span> <b>FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY</b> \
1174           <a href="ft2-basic_types.html#ft_make_tag">FT_MAKE_TAG</a>( 'i', 'g', 'p', 'f' )
1175
1176   /* this constant is deprecated */
1177 #<span class="keyword">define</span> FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY \
1178           <b>FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY</b>
1179 </pre>
1180 </div>
1181
1182 <p>A tag for <code><a href="ft2-base_interface.html#ft_parameter">FT_Parameter</a></code> to make <code><a href="ft2-base_interface.html#ft_open_face">FT_Open_Face</a></code> ignore typographic family names in the &lsquo;name&rsquo; table (introduced in OpenType version 1.4). Use this for backward compatibility with legacy systems that have a four-faces-per-family restriction.</p>
1183 <h4>since</h4>
1184
1185 <p>2.8</p>
1186 <hr>
1187
1188 <h2 id="ft_param_tag_ignore_typographic_subfamily">FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY<a class="headerlink" href="#ft_param_tag_ignore_typographic_subfamily" title="Permanent link">&para;</a></h2>
1189 <div class = "codehilite">
1190 <pre>
1191 #<span class="keyword">define</span> <b>FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY</b> \
1192           <a href="ft2-basic_types.html#ft_make_tag">FT_MAKE_TAG</a>( 'i', 'g', 'p', 's' )
1193
1194   /* this constant is deprecated */
1195 #<span class="keyword">define</span> FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY \
1196           <b>FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY</b>
1197 </pre>
1198 </div>
1199
1200 <p>A tag for <code><a href="ft2-base_interface.html#ft_parameter">FT_Parameter</a></code> to make <code><a href="ft2-base_interface.html#ft_open_face">FT_Open_Face</a></code> ignore typographic subfamily names in the &lsquo;name&rsquo; table (introduced in OpenType version 1.4). Use this for backward compatibility with legacy systems that have a four-faces-per-family restriction.</p>
1201 <h4>since</h4>
1202
1203 <p>2.8</p>
1204 <hr>
1205
1206 <h2 id="ft_param_tag_incremental">FT_PARAM_TAG_INCREMENTAL<a class="headerlink" href="#ft_param_tag_incremental" title="Permanent link">&para;</a></h2>
1207 <div class = "codehilite">
1208 <pre>
1209 #<span class="keyword">define</span> <b>FT_PARAM_TAG_INCREMENTAL</b> \
1210           <a href="ft2-basic_types.html#ft_make_tag">FT_MAKE_TAG</a>( 'i', 'n', 'c', 'r' )
1211 </pre>
1212 </div>
1213
1214 <p>An <code><a href="ft2-base_interface.html#ft_parameter">FT_Parameter</a></code> tag to be used with <code><a href="ft2-base_interface.html#ft_open_face">FT_Open_Face</a></code> to indicate incremental glyph loading.</p>
1215 <hr>
1216
1217 <h2 id="ft_param_tag_lcd_filter_weights">FT_PARAM_TAG_LCD_FILTER_WEIGHTS<a class="headerlink" href="#ft_param_tag_lcd_filter_weights" title="Permanent link">&para;</a></h2>
1218 <div class = "codehilite">
1219 <pre>
1220 #<span class="keyword">define</span> <b>FT_PARAM_TAG_LCD_FILTER_WEIGHTS</b> \
1221           <a href="ft2-basic_types.html#ft_make_tag">FT_MAKE_TAG</a>( 'l', 'c', 'd', 'f' )
1222 </pre>
1223 </div>
1224
1225 <p>An <code><a href="ft2-base_interface.html#ft_parameter">FT_Parameter</a></code> tag to be used with <code><a href="ft2-base_interface.html#ft_face_properties">FT_Face_Properties</a></code>. The corresponding argument specifies the five LCD filter weights for a given face (if using <code><a href="ft2-base_interface.html#ft_load_target_xxx">FT_LOAD_TARGET_LCD</a></code>, for example), overriding the global default values or the values set up with <code><a href="ft2-lcd_rendering.html#ft_library_setlcdfilterweights">FT_Library_SetLcdFilterWeights</a></code>.</p>
1226 <h4>since</h4>
1227
1228 <p>2.8</p>
1229 <hr>
1230
1231 <h2 id="ft_param_tag_random_seed">FT_PARAM_TAG_RANDOM_SEED<a class="headerlink" href="#ft_param_tag_random_seed" title="Permanent link">&para;</a></h2>
1232 <div class = "codehilite">
1233 <pre>
1234 #<span class="keyword">define</span> <b>FT_PARAM_TAG_RANDOM_SEED</b> \
1235           <a href="ft2-basic_types.html#ft_make_tag">FT_MAKE_TAG</a>( 's', 'e', 'e', 'd' )
1236 </pre>
1237 </div>
1238
1239 <p>An <code><a href="ft2-base_interface.html#ft_parameter">FT_Parameter</a></code> tag to be used with <code><a href="ft2-base_interface.html#ft_face_properties">FT_Face_Properties</a></code>. The corresponding 32bit signed integer argument overrides the font driver's random seed value with a face-specific one; see <code><a href="ft2-properties.html#random-seed">random-seed</a></code>.</p>
1240 <h4>since</h4>
1241
1242 <p>2.8</p>
1243 <hr>
1244
1245 <h2 id="ft_param_tag_stem_darkening">FT_PARAM_TAG_STEM_DARKENING<a class="headerlink" href="#ft_param_tag_stem_darkening" title="Permanent link">&para;</a></h2>
1246 <div class = "codehilite">
1247 <pre>
1248 #<span class="keyword">define</span> <b>FT_PARAM_TAG_STEM_DARKENING</b> \
1249           <a href="ft2-basic_types.html#ft_make_tag">FT_MAKE_TAG</a>( 'd', 'a', 'r', 'k' )
1250 </pre>
1251 </div>
1252
1253 <p>An <code><a href="ft2-base_interface.html#ft_parameter">FT_Parameter</a></code> tag to be used with <code><a href="ft2-base_interface.html#ft_face_properties">FT_Face_Properties</a></code>. The corresponding Boolean argument specifies whether to apply stem darkening, overriding the global default values or the values set up with <code><a href="ft2-module_management.html#ft_property_set">FT_Property_Set</a></code> (see <code><a href="ft2-properties.html#no-stem-darkening">no-stem-darkening</a></code>).</p>
1254 <p>This is a passive setting that only takes effect if the font driver or autohinter honors it, which the CFF, Type&nbsp;1, and CID drivers always do, but the autohinter only in &lsquo;light&rsquo; hinting mode (as of version 2.9).</p>
1255 <h4>since</h4>
1256
1257 <p>2.8</p>
1258 <hr>
1259
1260 <h2 id="ft_param_tag_unpatented_hinting">FT_PARAM_TAG_UNPATENTED_HINTING<a class="headerlink" href="#ft_param_tag_unpatented_hinting" title="Permanent link">&para;</a></h2>
1261 <div class = "codehilite">
1262 <pre>
1263 #<span class="keyword">define</span> <b>FT_PARAM_TAG_UNPATENTED_HINTING</b> \
1264           <a href="ft2-basic_types.html#ft_make_tag">FT_MAKE_TAG</a>( 'u', 'n', 'p', 'a' )
1265 </pre>
1266 </div>
1267
1268 <p>Deprecated, no effect.</p>
1269 <p>Previously: A constant used as the tag of an <code><a href="ft2-base_interface.html#ft_parameter">FT_Parameter</a></code> structure to indicate that unpatented methods only should be used by the TrueType bytecode interpreter for a typeface opened by <code><a href="ft2-base_interface.html#ft_open_face">FT_Open_Face</a></code>.</p>
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