modules/freetype2/docs/reference/ft2-incremental.html

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  38 <center><h1>FreeType-2.3.7 API Reference</h1></center>
  39
  40 <center><h1>
  41 Incremental Loading
  42 </h1></center>
  43 <h2>Synopsis</h2>
  44 <table align=center cellspacing=5 cellpadding=0 border=0>
  45 <tr><td></td><td><a href="#FT_Incremental">FT_Incremental</a></td><td></td><td><a href="#FT_Incremental_GetGlyphMetricsFunc">FT_Incremental_GetGlyphMetricsFunc</a></td></tr>
  46 <tr><td></td><td><a href="#FT_Incremental_MetricsRec">FT_Incremental_MetricsRec</a></td><td></td><td><a href="#FT_Incremental_FuncsRec">FT_Incremental_FuncsRec</a></td></tr>
  47 <tr><td></td><td><a href="#FT_Incremental_Metrics">FT_Incremental_Metrics</a></td><td></td><td><a href="#FT_Incremental_InterfaceRec">FT_Incremental_InterfaceRec</a></td></tr>
  48 <tr><td></td><td><a href="#FT_Incremental_GetGlyphDataFunc">FT_Incremental_GetGlyphDataFunc</a></td><td></td><td><a href="#FT_Incremental_Interface">FT_Incremental_Interface</a></td></tr>
  49 <tr><td></td><td><a href="#FT_Incremental_FreeGlyphDataFunc">FT_Incremental_FreeGlyphDataFunc</a></td><td></td><td><a href="#FT_PARAM_TAG_INCREMENTAL">FT_PARAM_TAG_INCREMENTAL</a></td></tr>
  50 </table><br><br>
  51
  52 <table align=center width="87%"><tr><td>
  53 <p>This section contains various functions used to perform so-called &lsquo;incremental&rsquo; glyph loading. This is a mode where all glyphs loaded from a given <a href="ft2-base_interface.html#FT_Face">FT_Face</a> are provided by the client application,</p>
  54 <p>Apart from that, all other tables are loaded normally from the font file. This mode is useful when FreeType is used within another engine, e.g., a PostScript Imaging Processor.</p>
  55 <p>To enable this mode, you must use <a href="ft2-base_interface.html#FT_Open_Face">FT_Open_Face</a>, passing an <a href="ft2-base_interface.html#FT_Parameter">FT_Parameter</a> with the <a href="ft2-incremental.html#FT_PARAM_TAG_INCREMENTAL">FT_PARAM_TAG_INCREMENTAL</a> tag and an <a href="ft2-incremental.html#FT_Incremental_Interface">FT_Incremental_Interface</a> value. See the comments for <a href="ft2-incremental.html#FT_Incremental_InterfaceRec">FT_Incremental_InterfaceRec</a> for an example.</p>
  56 </td></tr></table><br>
  57 <table align=center width="75%"><tr><td>
  58 <h4><a name="FT_Incremental">FT_Incremental</a></h4>
  59 <table align=center width="87%"><tr><td>
  60 Defined in FT_INCREMENTAL_H (freetype/ftincrem.h).
  61 </td></tr></table><br>
  62 <table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>
  63
  64   <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_IncrementalRec_*  <b>FT_Incremental</b>;
  65
  66 </pre></table><br>
  67 <table align=center width="87%"><tr><td>
  68 <p>An opaque type describing a user-provided object used to implement &lsquo;incremental&rsquo; glyph loading within FreeType. This is used to support embedded fonts in certain environments (e.g., PostScript interpreters), where the glyph data isn't in the font file, or must be overridden by different values.</p>
  69 </td></tr></table><br>
  70 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td>
  71 <p>It is up to client applications to create and implement <a href="ft2-incremental.html#FT_Incremental">FT_Incremental</a> objects, as long as they provide implementations for the methods <a href="ft2-incremental.html#FT_Incremental_GetGlyphDataFunc">FT_Incremental_GetGlyphDataFunc</a>, <a href="ft2-incremental.html#FT_Incremental_FreeGlyphDataFunc">FT_Incremental_FreeGlyphDataFunc</a> and <a href="ft2-incremental.html#FT_Incremental_GetGlyphMetricsFunc">FT_Incremental_GetGlyphMetricsFunc</a>.</p>
  72 <p>See the description of <a href="ft2-incremental.html#FT_Incremental_InterfaceRec">FT_Incremental_InterfaceRec</a> to understand how to use incremental objects with FreeType.</p>
  73 </td></tr></table>
  74 </td></tr></table>
  75 <hr width="75%">
  76 <table align=center width="75%"><tr><td><font size=-2>[<a href="ft2-index.html">Index</a>]</font></td>
  77 <td width="100%"></td>
  78 <td><font size=-2>[<a href="ft2-toc.html">TOC</a>]</font></td></tr></table>
  79
  80 <table align=center width="75%"><tr><td>
  81 <h4><a name="FT_Incremental_MetricsRec">FT_Incremental_MetricsRec</a></h4>
  82 <table align=center width="87%"><tr><td>
  83 Defined in FT_INCREMENTAL_H (freetype/ftincrem.h).
  84 </td></tr></table><br>
  85 <table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>
  86
  87   <span class="keyword">typedef</span> <span class="keyword">struct</span>  FT_Incremental_MetricsRec_
  88   {
  89     <a href="ft2-basic_types.html#FT_Long">FT_Long</a>  bearing_x;
  90     <a href="ft2-basic_types.html#FT_Long">FT_Long</a>  bearing_y;
  91     <a href="ft2-basic_types.html#FT_Long">FT_Long</a>  advance;
  92
  93   } <b>FT_Incremental_MetricsRec</b>;
  94
  95 </pre></table><br>
  96 <table align=center width="87%"><tr><td>
  97 <p>A small structure used to contain the basic glyph metrics returned by the <a href="ft2-incremental.html#FT_Incremental_GetGlyphMetricsFunc">FT_Incremental_GetGlyphMetricsFunc</a> method.</p>
  98 </td></tr></table><br>
  99 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>fields</b></em></td></tr><tr><td>
 100 <p></p>
 101 <table cellpadding=3 border=0>
 102 <tr valign=top><td><b>bearing_x</b></td><td>
 103 <p>Left bearing, in font units.</p>
 104 </td></tr>
 105 <tr valign=top><td><b>bearing_y</b></td><td>
 106 <p>Top bearing, in font units.</p>
 107 </td></tr>
 108 <tr valign=top><td><b>advance</b></td><td>
 109 <p>Glyph advance, in font units.</p>
 110 </td></tr>
 111 </table>
 112 </td></tr></table>
 113 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td>
 114 <p>These correspond to horizontal or vertical metrics depending on the value of the &lsquo;vertical&rsquo; argument to the function <a href="ft2-incremental.html#FT_Incremental_GetGlyphMetricsFunc">FT_Incremental_GetGlyphMetricsFunc</a>.</p>
 115 </td></tr></table>
 116 </td></tr></table>
 117 <hr width="75%">
 118 <table align=center width="75%"><tr><td><font size=-2>[<a href="ft2-index.html">Index</a>]</font></td>
 119 <td width="100%"></td>
 120 <td><font size=-2>[<a href="ft2-toc.html">TOC</a>]</font></td></tr></table>
 121
 122 <table align=center width="75%"><tr><td>
 123 <h4><a name="FT_Incremental_Metrics">FT_Incremental_Metrics</a></h4>
 124 <table align=center width="87%"><tr><td>
 125 Defined in FT_INCREMENTAL_H (freetype/ftincrem.h).
 126 </td></tr></table><br>
 127 <table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>
 128
 129    <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Incremental_MetricsRec_*  <b>FT_Incremental_Metrics</b>;
 130
 131 </pre></table><br>
 132 <table align=center width="87%"><tr><td>
 133 <p>A handle to an <a href="ft2-incremental.html#FT_Incremental_MetricsRec">FT_Incremental_MetricsRec</a> structure.</p>
 134 </td></tr></table><br>
 135 </td></tr></table>
 136 <hr width="75%">
 137 <table align=center width="75%"><tr><td><font size=-2>[<a href="ft2-index.html">Index</a>]</font></td>
 138 <td width="100%"></td>
 139 <td><font size=-2>[<a href="ft2-toc.html">TOC</a>]</font></td></tr></table>
 140
 141 <table align=center width="75%"><tr><td>
 142 <h4><a name="FT_Incremental_GetGlyphDataFunc">FT_Incremental_GetGlyphDataFunc</a></h4>
 143 <table align=center width="87%"><tr><td>
 144 Defined in FT_INCREMENTAL_H (freetype/ftincrem.h).
 145 </td></tr></table><br>
 146 <table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>
 147
 148   <span class="keyword">typedef</span> <a href="ft2-basic_types.html#FT_Error">FT_Error</a>
 149   (*<b>FT_Incremental_GetGlyphDataFunc</b>)( <a href="ft2-incremental.html#FT_Incremental">FT_Incremental</a>  incremental,
 150                                       <a href="ft2-basic_types.html#FT_UInt">FT_UInt</a>         glyph_index,
 151                                       <a href="ft2-basic_types.html#FT_Data">FT_Data</a>*        adata );
 152
 153 </pre></table><br>
 154 <table align=center width="87%"><tr><td>
 155 <p>A function called by FreeType to access a given glyph's data bytes during <a href="ft2-base_interface.html#FT_Load_Glyph">FT_Load_Glyph</a> or <a href="ft2-base_interface.html#FT_Load_Char">FT_Load_Char</a> if incremental loading is enabled.</p>
 156 <p>Note that the format of the glyph's data bytes depends on the font file format. For TrueType, it must correspond to the raw bytes within the &lsquo;glyf&rsquo; table. For PostScript formats, it must correspond to the <b>unencrypted</b> charstring bytes, without any &lsquo;lenIV&rsquo; header. It is undefined for any other format.</p>
 157 </td></tr></table><br>
 158 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td>
 159 <p></p>
 160 <table cellpadding=3 border=0>
 161 <tr valign=top><td><b>incremental</b></td><td>
 162 <p>Handle to an opaque <a href="ft2-incremental.html#FT_Incremental">FT_Incremental</a> handle provided by the client application.</p>
 163 </td></tr>
 164 <tr valign=top><td><b>glyph_index</b></td><td>
 165 <p>Index of relevant glyph.</p>
 166 </td></tr>
 167 </table>
 168 </td></tr></table>
 169 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>output</b></em></td></tr><tr><td>
 170 <p></p>
 171 <table cellpadding=3 border=0>
 172 <tr valign=top><td><b>adata</b></td><td>
 173 <p>A structure describing the returned glyph data bytes (which will be accessed as a read-only byte block).</p>
 174 </td></tr>
 175 </table>
 176 </td></tr></table>
 177 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td>
 178 <p>FreeType error code. 0&nbsp;means success.</p>
 179 </td></tr></table>
 180 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td>
 181 <p>If this function returns successfully the method <a href="ft2-incremental.html#FT_Incremental_FreeGlyphDataFunc">FT_Incremental_FreeGlyphDataFunc</a> will be called later to release the data bytes.</p>
 182 <p>Nested calls to <a href="ft2-incremental.html#FT_Incremental_GetGlyphDataFunc">FT_Incremental_GetGlyphDataFunc</a> can happen for compound glyphs.</p>
 183 </td></tr></table>
 184 </td></tr></table>
 185 <hr width="75%">
 186 <table align=center width="75%"><tr><td><font size=-2>[<a href="ft2-index.html">Index</a>]</font></td>
 187 <td width="100%"></td>
 188 <td><font size=-2>[<a href="ft2-toc.html">TOC</a>]</font></td></tr></table>
 189
 190 <table align=center width="75%"><tr><td>
 191 <h4><a name="FT_Incremental_FreeGlyphDataFunc">FT_Incremental_FreeGlyphDataFunc</a></h4>
 192 <table align=center width="87%"><tr><td>
 193 Defined in FT_INCREMENTAL_H (freetype/ftincrem.h).
 194 </td></tr></table><br>
 195 <table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>
 196
 197   <span class="keyword">typedef</span> <span class="keyword">void</span>
 198   (*<b>FT_Incremental_FreeGlyphDataFunc</b>)( <a href="ft2-incremental.html#FT_Incremental">FT_Incremental</a>  incremental,
 199                                        <a href="ft2-basic_types.html#FT_Data">FT_Data</a>*        data );
 200
 201 </pre></table><br>
 202 <table align=center width="87%"><tr><td>
 203 <p>A function used to release the glyph data bytes returned by a successful call to <a href="ft2-incremental.html#FT_Incremental_GetGlyphDataFunc">FT_Incremental_GetGlyphDataFunc</a>.</p>
 204 </td></tr></table><br>
 205 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td>
 206 <p></p>
 207 <table cellpadding=3 border=0>
 208 <tr valign=top><td><b>incremental</b></td><td>
 209 <p>A handle to an opaque <a href="ft2-incremental.html#FT_Incremental">FT_Incremental</a> handle provided by the client application.</p>
 210 </td></tr>
 211 <tr valign=top><td><b>data</b></td><td>
 212 <p>A structure describing the glyph data bytes (which will be accessed as a read-only byte block).</p>
 213 </td></tr>
 214 </table>
 215 </td></tr></table>
 216 </td></tr></table>
 217 <hr width="75%">
 218 <table align=center width="75%"><tr><td><font size=-2>[<a href="ft2-index.html">Index</a>]</font></td>
 219 <td width="100%"></td>
 220 <td><font size=-2>[<a href="ft2-toc.html">TOC</a>]</font></td></tr></table>
 221
 222 <table align=center width="75%"><tr><td>
 223 <h4><a name="FT_Incremental_GetGlyphMetricsFunc">FT_Incremental_GetGlyphMetricsFunc</a></h4>
 224 <table align=center width="87%"><tr><td>
 225 Defined in FT_INCREMENTAL_H (freetype/ftincrem.h).
 226 </td></tr></table><br>
 227 <table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>
 228
 229   <span class="keyword">typedef</span> <a href="ft2-basic_types.html#FT_Error">FT_Error</a>
 230   (*<b>FT_Incremental_GetGlyphMetricsFunc</b>)
 231                       ( <a href="ft2-incremental.html#FT_Incremental">FT_Incremental</a>              incremental,
 232                         <a href="ft2-basic_types.html#FT_UInt">FT_UInt</a>                     glyph_index,
 233                         <a href="ft2-basic_types.html#FT_Bool">FT_Bool</a>                     vertical,
 234                         <a href="ft2-incremental.html#FT_Incremental_MetricsRec">FT_Incremental_MetricsRec</a>  *ametrics );
 235
 236 </pre></table><br>
 237 <table align=center width="87%"><tr><td>
 238 <p>A function used to retrieve the basic metrics of a given glyph index before accessing its data. This is necessary because, in certain formats like TrueType, the metrics are stored in a different place from the glyph images proper.</p>
 239 </td></tr></table><br>
 240 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td>
 241 <p></p>
 242 <table cellpadding=3 border=0>
 243 <tr valign=top><td><b>incremental</b></td><td>
 244 <p>A handle to an opaque <a href="ft2-incremental.html#FT_Incremental">FT_Incremental</a> handle provided by the client application.</p>
 245 </td></tr>
 246 <tr valign=top><td><b>glyph_index</b></td><td>
 247 <p>Index of relevant glyph.</p>
 248 </td></tr>
 249 <tr valign=top><td><b>vertical</b></td><td>
 250 <p>If true, return vertical metrics.</p>
 251 </td></tr>
 252 <tr valign=top><td><b>ametrics</b></td><td>
 253 <p>This parameter is used for both input and output. The original glyph metrics, if any, in font units. If metrics are not available all the values must be set to zero.</p>
 254 </td></tr>
 255 </table>
 256 </td></tr></table>
 257 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>output</b></em></td></tr><tr><td>
 258 <p></p>
 259 <table cellpadding=3 border=0>
 260 <tr valign=top><td><b>ametrics</b></td><td>
 261 <p>The replacement glyph metrics in font units.</p>
 262 </td></tr>
 263 </table>
 264 </td></tr></table>
 265 </td></tr></table>
 266 <hr width="75%">
 267 <table align=center width="75%"><tr><td><font size=-2>[<a href="ft2-index.html">Index</a>]</font></td>
 268 <td width="100%"></td>
 269 <td><font size=-2>[<a href="ft2-toc.html">TOC</a>]</font></td></tr></table>
 270
 271 <table align=center width="75%"><tr><td>
 272 <h4><a name="FT_Incremental_FuncsRec">FT_Incremental_FuncsRec</a></h4>
 273 <table align=center width="87%"><tr><td>
 274 Defined in FT_INCREMENTAL_H (freetype/ftincrem.h).
 275 </td></tr></table><br>
 276 <table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>
 277
 278   <span class="keyword">typedef</span> <span class="keyword">struct</span>  FT_Incremental_FuncsRec_
 279   {
 280     <a href="ft2-incremental.html#FT_Incremental_GetGlyphDataFunc">FT_Incremental_GetGlyphDataFunc</a>     get_glyph_data;
 281     <a href="ft2-incremental.html#FT_Incremental_FreeGlyphDataFunc">FT_Incremental_FreeGlyphDataFunc</a>    free_glyph_data;
 282     <a href="ft2-incremental.html#FT_Incremental_GetGlyphMetricsFunc">FT_Incremental_GetGlyphMetricsFunc</a>  get_glyph_metrics;
 283
 284   } <b>FT_Incremental_FuncsRec</b>;
 285
 286 </pre></table><br>
 287 <table align=center width="87%"><tr><td>
 288 <p>A table of functions for accessing fonts that load data incrementally. Used in <a href="ft2-incremental.html#FT_Incremental_InterfaceRec">FT_Incremental_InterfaceRec</a>.</p>
 289 </td></tr></table><br>
 290 <table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>fields</b></em></td></tr><tr><td>
 291 <p></p>
 292 <table cellpadding=3 border=0>
 293 <tr valign=top><td><b>get_glyph_data</b></td><td>
 294 <p>The function to get glyph data. Must not be null.</p>
 295 </td></tr>
 296 <tr valign=top><td><b>free_glyph_data</b></td><td>
 297 <p>The function to release glyph data. Must not be null.</p>
 298 </td></tr>
 299 <tr valign=top><td><b>get_glyph_metrics</b></td><td>
 300 <p>The function to get glyph metrics. May be null if the font does not provide overriding glyph metrics.</p>
 301 </td></tr>
 302 </table>
 303 </td></tr></table>
 304 </td></tr></table>
 305 <hr width="75%">
 306 <table align=center width="75%"><tr><td><font size=-2>[<a href="ft2-index.html">Index</a>]</font></td>
 307 <td width="100%"></td>
 308 <td><font size=-2>[<a href="ft2-toc.html">TOC</a>]</font></td></tr></table>
 309
 310 <table align=center width="75%"><tr><td>
 311 <h4><a name="FT_Incremental_InterfaceRec">FT_Incremental_InterfaceRec</a></h4>
 312 <table align=center width="87%"><tr><td>
 313 Defined in FT_INCREMENTAL_H (freetype/ftincrem.h).
 314 </td></tr></table><br>
 315 <table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>
 316
 317   <span class="keyword">typedef</span> <span class="keyword">struct</span>  FT_Incremental_InterfaceRec_
 318   {
 319     <span class="keyword">const</span> <a href="ft2-incremental.html#FT_Incremental_FuncsRec">FT_Incremental_FuncsRec</a>*  funcs;
 320     <a href="ft2-incremental.html#FT_Incremental">FT_Incremental</a>                  object;
 321
 322   } <b>FT_Incremental_InterfaceRec</b>;
 323
 324 </pre></table><br>
 325 <table align=center width="87%"><tr><td>
 326 <p>A structure to be used with <a href="ft2-base_interface.html#FT_Open_Face">FT_Open_Face</a> to indicate that the user wants to support incremental glyph loading. You should use it with <a href="ft2-incremental.html#FT_PARAM_TAG_INCREMENTAL">FT_PARAM_TAG_INCREMENTAL</a> as in the following example:</p>
 327 <pre class="colored">
 328   FT_Incremental_InterfaceRec  inc_int;
 329   FT_Parameter                 parameter;
 330   FT_Open_Args                 open_args;
 331
 332
 333   // set up incremental descriptor
 334   inc_int.funcs  = my_funcs;
 335   inc_int.object = my_object;
 336
 337   // set up optional parameter
 338   parameter.tag  = FT_PARAM_TAG_INCREMENTAL;
 339   parameter.data = &amp;inc_int;
 340
 341   // set up FT_Open_Args structure
 342   open_args.flags      = FT_OPEN_PATHNAME | FT_OPEN_PARAMS;
 343   open_args.pathname   = my_font_pathname;
 344   open_args.num_params = 1;
 345   open_args.params     = &amp;parameter; // we use one optional argument
 346
 347   // open the font
 348   error = FT_Open_Face( library, &amp;open_args, index, &amp;face );
 349   ...
 350 </pre>
 351 </td></tr></table><br>
 352 </td></tr></table>
 353 <hr width="75%">
 354 <table align=center width="75%"><tr><td><font size=-2>[<a href="ft2-index.html">Index</a>]</font></td>
 355 <td width="100%"></td>
 356 <td><font size=-2>[<a href="ft2-toc.html">TOC</a>]</font></td></tr></table>
 357
 358 <table align=center width="75%"><tr><td>
 359 <h4><a name="FT_Incremental_Interface">FT_Incremental_Interface</a></h4>
 360 <table align=center width="87%"><tr><td>
 361 Defined in FT_INCREMENTAL_H (freetype/ftincrem.h).
 362 </td></tr></table><br>
 363 <table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>
 364
 365   <span class="keyword">typedef</span> <a href="ft2-incremental.html#FT_Incremental_InterfaceRec">FT_Incremental_InterfaceRec</a>*   <b>FT_Incremental_Interface</b>;
 366
 367 </pre></table><br>
 368 <table align=center width="87%"><tr><td>
 369 <p>A pointer to an <a href="ft2-incremental.html#FT_Incremental_InterfaceRec">FT_Incremental_InterfaceRec</a> structure.</p>
 370 </td></tr></table><br>
 371 </td></tr></table>
 372 <hr width="75%">
 373 <table align=center width="75%"><tr><td><font size=-2>[<a href="ft2-index.html">Index</a>]</font></td>
 374 <td width="100%"></td>
 375 <td><font size=-2>[<a href="ft2-toc.html">TOC</a>]</font></td></tr></table>
 376
 377 <table align=center width="75%"><tr><td>
 378 <h4><a name="FT_PARAM_TAG_INCREMENTAL">FT_PARAM_TAG_INCREMENTAL</a></h4>
 379 <table align=center width="87%"><tr><td>
 380 Defined in FT_INCREMENTAL_H (freetype/ftincrem.h).
 381 </td></tr></table><br>
 382 <table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>
 383
 384 #define <b>FT_PARAM_TAG_INCREMENTAL</b>  <a href="ft2-basic_types.html#FT_MAKE_TAG">FT_MAKE_TAG</a>( 'i', 'n', 'c', 'r' )
 385
 386 </pre></table><br>
 387 <table align=center width="87%"><tr><td>
 388 <p>A constant used as the tag of <a href="ft2-base_interface.html#FT_Parameter">FT_Parameter</a> structures to indicate an incremental loading object to be used by FreeType.</p>
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