docs/reference/ft2-ot_validation.html

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 114               FreeType-2.10.4 API Reference
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 118                 OpenType Validation
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 215       General Remarks
 216     </label>
 217     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
 218       <label class="md-nav__title" for="nav-3">
 219         General Remarks
 220       </label>
 221       <ul class="md-nav__list" data-md-scrollfix>
 222
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 229   <li class="md-nav__item">
 230     <a href="ft2-header_inclusion.html" title="FreeType's header inclusion scheme" class="md-nav__link">
 231       FreeType's header inclusion scheme
 232     </a>
 233   </li>
 234
 235
 236
 237
 238
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 240
 241   <li class="md-nav__item">
 242     <a href="ft2-user_allocation.html" title="User allocation" class="md-nav__link">
 243       User allocation
 244     </a>
 245   </li>
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 263       Core API
 264     </label>
 265     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
 266       <label class="md-nav__title" for="nav-4">
 267         Core API
 268       </label>
 269       <ul class="md-nav__list" data-md-scrollfix>
 270
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 277   <li class="md-nav__item">
 278     <a href="ft2-version.html" title="FreeType Version" class="md-nav__link">
 279       FreeType Version
 280     </a>
 281   </li>
 282
 283
 284
 285
 286
 287
 288
 289   <li class="md-nav__item">
 290     <a href="ft2-basic_types.html" title="Basic Data Types" class="md-nav__link">
 291       Basic Data Types
 292     </a>
 293   </li>
 294
 295
 296
 297
 298
 299
 300
 301   <li class="md-nav__item">
 302     <a href="ft2-base_interface.html" title="Base Interface" class="md-nav__link">
 303       Base Interface
 304     </a>
 305   </li>
 306
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 309
 310
 311
 312
 313   <li class="md-nav__item">
 314     <a href="ft2-glyph_variants.html" title="Unicode Variation Sequences" class="md-nav__link">
 315       Unicode Variation Sequences
 316     </a>
 317   </li>
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 324
 325   <li class="md-nav__item">
 326     <a href="ft2-color_management.html" title="Glyph Color Management" class="md-nav__link">
 327       Glyph Color Management
 328     </a>
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 337   <li class="md-nav__item">
 338     <a href="ft2-layer_management.html" title="Glyph Layer Management" class="md-nav__link">
 339       Glyph Layer Management
 340     </a>
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 350     <a href="ft2-glyph_management.html" title="Glyph Management" class="md-nav__link">
 351       Glyph Management
 352     </a>
 353   </li>
 354
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 360
 361   <li class="md-nav__item">
 362     <a href="ft2-mac_specific.html" title="Mac Specific Interface" class="md-nav__link">
 363       Mac Specific Interface
 364     </a>
 365   </li>
 366
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 369
 370
 371
 372
 373   <li class="md-nav__item">
 374     <a href="ft2-sizes_management.html" title="Size Management" class="md-nav__link">
 375       Size Management
 376     </a>
 377   </li>
 378
 379
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 384
 385   <li class="md-nav__item">
 386     <a href="ft2-header_file_macros.html" title="Header File Macros" class="md-nav__link">
 387       Header File Macros
 388     </a>
 389   </li>
 390
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 407       Format-Specific API
 408     </label>
 409     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
 410       <label class="md-nav__title" for="nav-5">
 411         Format-Specific API
 412       </label>
 413       <ul class="md-nav__list" data-md-scrollfix>
 414
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 421   <li class="md-nav__item">
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 423       Multiple Masters
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 434     <a href="ft2-truetype_tables.html" title="TrueType Tables" class="md-nav__link">
 435       TrueType Tables
 436     </a>
 437   </li>
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 444
 445   <li class="md-nav__item">
 446     <a href="ft2-type1_tables.html" title="Type 1 Tables" class="md-nav__link">
 447       Type 1 Tables
 448     </a>
 449   </li>
 450
 451
 452
 453
 454
 455
 456
 457   <li class="md-nav__item">
 458     <a href="ft2-sfnt_names.html" title="SFNT Names" class="md-nav__link">
 459       SFNT Names
 460     </a>
 461   </li>
 462
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 464
 465
 466
 467
 468
 469   <li class="md-nav__item">
 470     <a href="ft2-bdf_fonts.html" title="BDF and PCF Files" class="md-nav__link">
 471       BDF and PCF Files
 472     </a>
 473   </li>
 474
 475
 476
 477
 478
 479
 480
 481   <li class="md-nav__item">
 482     <a href="ft2-cid_fonts.html" title="CID Fonts" class="md-nav__link">
 483       CID Fonts
 484     </a>
 485   </li>
 486
 487
 488
 489
 490
 491
 492
 493   <li class="md-nav__item">
 494     <a href="ft2-pfr_fonts.html" title="PFR Fonts" class="md-nav__link">
 495       PFR Fonts
 496     </a>
 497   </li>
 498
 499
 500
 501
 502
 503
 504
 505   <li class="md-nav__item">
 506     <a href="ft2-winfnt_fonts.html" title="Window FNT Files" class="md-nav__link">
 507       Window FNT Files
 508     </a>
 509   </li>
 510
 511
 512
 513
 514
 515
 516
 517   <li class="md-nav__item">
 518     <a href="ft2-font_formats.html" title="Font Formats" class="md-nav__link">
 519       Font Formats
 520     </a>
 521   </li>
 522
 523
 524
 525
 526
 527
 528
 529   <li class="md-nav__item">
 530     <a href="ft2-gasp_table.html" title="Gasp Table" class="md-nav__link">
 531       Gasp Table
 532     </a>
 533   </li>
 534
 535
 536       </ul>
 537     </nav>
 538   </li>
 539
 540
 541
 542
 543
 544
 545
 546   <li class="md-nav__item md-nav__item--nested">
 547
 548       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-6" type="checkbox" id="nav-6">
 549
 550     <label class="md-nav__link" for="nav-6">
 551       Controlling FreeType Modules
 552     </label>
 553     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
 554       <label class="md-nav__title" for="nav-6">
 555         Controlling FreeType Modules
 556       </label>
 557       <ul class="md-nav__list" data-md-scrollfix>
 558
 559
 560
 561
 562
 563
 564
 565   <li class="md-nav__item">
 566     <a href="ft2-auto_hinter.html" title="The auto-hinter" class="md-nav__link">
 567       The auto-hinter
 568     </a>
 569   </li>
 570
 571
 572
 573
 574
 575
 576
 577   <li class="md-nav__item">
 578     <a href="ft2-cff_driver.html" title="The CFF driver" class="md-nav__link">
 579       The CFF driver
 580     </a>
 581   </li>
 582
 583
 584
 585
 586
 587
 588
 589   <li class="md-nav__item">
 590     <a href="ft2-t1_cid_driver.html" title="The Type 1 and CID drivers" class="md-nav__link">
 591       The Type 1 and CID drivers
 592     </a>
 593   </li>
 594
 595
 596
 597
 598
 599
 600
 601   <li class="md-nav__item">
 602     <a href="ft2-tt_driver.html" title="The TrueType driver" class="md-nav__link">
 603       The TrueType driver
 604     </a>
 605   </li>
 606
 607
 608
 609
 610
 611
 612
 613   <li class="md-nav__item">
 614     <a href="ft2-pcf_driver.html" title="The PCF driver" class="md-nav__link">
 615       The PCF driver
 616     </a>
 617   </li>
 618
 619
 620
 621
 622
 623
 624
 625   <li class="md-nav__item">
 626     <a href="ft2-properties.html" title="Driver properties" class="md-nav__link">
 627       Driver properties
 628     </a>
 629   </li>
 630
 631
 632
 633
 634
 635
 636
 637   <li class="md-nav__item">
 638     <a href="ft2-parameter_tags.html" title="Parameter Tags" class="md-nav__link">
 639       Parameter Tags
 640     </a>
 641   </li>
 642
 643
 644
 645
 646
 647
 648
 649   <li class="md-nav__item">
 650     <a href="ft2-lcd_rendering.html" title="Subpixel Rendering" class="md-nav__link">
 651       Subpixel Rendering
 652     </a>
 653   </li>
 654
 655
 656       </ul>
 657     </nav>
 658   </li>
 659
 660
 661
 662
 663
 664
 665
 666   <li class="md-nav__item md-nav__item--nested">
 667
 668       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-7" type="checkbox" id="nav-7">
 669
 670     <label class="md-nav__link" for="nav-7">
 671       Cache Sub-System
 672     </label>
 673     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
 674       <label class="md-nav__title" for="nav-7">
 675         Cache Sub-System
 676       </label>
 677       <ul class="md-nav__list" data-md-scrollfix>
 678
 679
 680
 681
 682
 683
 684
 685   <li class="md-nav__item">
 686     <a href="ft2-cache_subsystem.html" title="Cache Sub-System" class="md-nav__link">
 687       Cache Sub-System
 688     </a>
 689   </li>
 690
 691
 692       </ul>
 693     </nav>
 694   </li>
 695
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 705
 706     <label class="md-nav__link" for="nav-8">
 707       Support API
 708     </label>
 709     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
 710       <label class="md-nav__title" for="nav-8">
 711         Support API
 712       </label>
 713       <ul class="md-nav__list" data-md-scrollfix>
 714
 715
 716
 717
 718
 719
 720
 721   <li class="md-nav__item">
 722     <a href="ft2-computations.html" title="Computations" class="md-nav__link">
 723       Computations
 724     </a>
 725   </li>
 726
 727
 728
 729
 730
 731
 732
 733   <li class="md-nav__item">
 734     <a href="ft2-list_processing.html" title="List Processing" class="md-nav__link">
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 980
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 985         OpenType Validation
 986       </label>
 987
 988     <a href="ft2-ot_validation.html" title="OpenType Validation" class="md-nav__link md-nav__link--active">
 989       OpenType Validation
 990     </a>
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1000     <ul class="md-nav__list" data-md-scrollfix>
1001
1002         <li class="md-nav__item">
1003   <a href="#synopsis" class="md-nav__link">
1004     Synopsis
1005   </a>
1006
1007 </li>
1008
1009         <li class="md-nav__item">
1010   <a href="#ft_opentype_validate" class="md-nav__link">
1011     FT_OpenType_Validate
1012   </a>
1013
1014 </li>
1015
1016         <li class="md-nav__item">
1017   <a href="#ft_opentype_free" class="md-nav__link">
1018     FT_OpenType_Free
1019   </a>
1020
1021 </li>
1022
1023         <li class="md-nav__item">
1024   <a href="#ft_validate_otxxx" class="md-nav__link">
1025     FT_VALIDATE_OTXXX
1026   </a>
1027
1028 </li>
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1030
1031
1032
1033
1034     </ul>
1035
1036 </nav>
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1065
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1068     Synopsis
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1070
1071 </li>
1072
1073         <li class="md-nav__item">
1074   <a href="#ft_opentype_validate" class="md-nav__link">
1075     FT_OpenType_Validate
1076   </a>
1077
1078 </li>
1079
1080         <li class="md-nav__item">
1081   <a href="#ft_opentype_free" class="md-nav__link">
1082     FT_OpenType_Free
1083   </a>
1084
1085 </li>
1086
1087         <li class="md-nav__item">
1088   <a href="#ft_validate_otxxx" class="md-nav__link">
1089     FT_VALIDATE_OTXXX
1090   </a>
1091
1092 </li>
1093
1094
1095
1096
1097
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1099
1100 </nav>
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1104
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1108
1109
1110
1111                 <p><a href="https://www.freetype.org">FreeType</a> &raquo; <a href="../">Docs</a> &raquo; <a href="index.html#miscellaneous">Miscellaneous</a> &raquo; OpenType Validation</p>
1112 <hr />
1113 <h1 id="opentype-validation">OpenType Validation<a class="headerlink" href="#opentype-validation" title="Permanent link">&para;</a></h1>
1114 <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">&para;</a></h2>
1115 <p>This section contains the declaration of functions to validate some OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF, MATH).</p>
1116 <h2 id="ft_opentype_validate">FT_OpenType_Validate<a class="headerlink" href="#ft_opentype_validate" title="Permanent link">&para;</a></h2>
1117 <p>Defined in FT_OPENTYPE_VALIDATE_H (freetype/ftotval.h).</p>
1118 <div class = "codehilite"><pre><code>  FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
1119   <b>FT_OpenType_Validate</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>    face,
1120                         <a href="ft2-basic_types.html#ft_uint">FT_UInt</a>    validation_flags,
1121                         <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a>  *BASE_table,
1122                         <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a>  *GDEF_table,
1123                         <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a>  *GPOS_table,
1124                         <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a>  *GSUB_table,
1125                         <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a>  *JSTF_table );
1126 </code></pre></div>
1127
1128 <p>Validate various OpenType tables to assure that all offsets and indices are valid. The idea is that a higher-level library that actually does the text layout can access those tables without error checking (which can be quite time consuming).</p>
1129 <h4>input</h4>
1130
1131 <table class="fields">
1132 <tr><td class="val" id="face">face</td><td class="desc">
1133 <p>A handle to the input face.</p>
1134 </td></tr>
1135 <tr><td class="val" id="validation_flags">validation_flags</td><td class="desc">
1136 <p>A bit field that specifies the tables to be validated. See <code><a href="ft2-ot_validation.html#ft_validate_otxxx">FT_VALIDATE_OTXXX</a></code> for possible values.</p>
1137 </td></tr>
1138 </table>
1139
1140 <h4>output</h4>
1141
1142 <table class="fields">
1143 <tr><td class="val" id="base_table">BASE_table</td><td class="desc">
1144 <p>A pointer to the BASE table.</p>
1145 </td></tr>
1146 <tr><td class="val" id="gdef_table">GDEF_table</td><td class="desc">
1147 <p>A pointer to the GDEF table.</p>
1148 </td></tr>
1149 <tr><td class="val" id="gpos_table">GPOS_table</td><td class="desc">
1150 <p>A pointer to the GPOS table.</p>
1151 </td></tr>
1152 <tr><td class="val" id="gsub_table">GSUB_table</td><td class="desc">
1153 <p>A pointer to the GSUB table.</p>
1154 </td></tr>
1155 <tr><td class="val" id="jstf_table">JSTF_table</td><td class="desc">
1156 <p>A pointer to the JSTF table.</p>
1157 </td></tr>
1158 </table>
1159
1160 <h4>return</h4>
1161
1162 <p>FreeType error code. 0&nbsp;means success.</p>
1163 <h4>note</h4>
1164
1165 <p>This function only works with OpenType fonts, returning an error otherwise.</p>
1166 <p>After use, the application should deallocate the five tables with <code><a href="ft2-ot_validation.html#ft_opentype_free">FT_OpenType_Free</a></code>. A <code>NULL</code> value indicates that the table either doesn't exist in the font, or the application hasn't asked for validation.</p>
1167 <hr>
1168
1169 <h2 id="ft_opentype_free">FT_OpenType_Free<a class="headerlink" href="#ft_opentype_free" title="Permanent link">&para;</a></h2>
1170 <p>Defined in FT_OPENTYPE_VALIDATE_H (freetype/ftotval.h).</p>
1171 <div class = "codehilite"><pre><code>  FT_EXPORT( <span class="keyword">void</span> )
1172   <b>FT_OpenType_Free</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a>   face,
1173                     <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a>  table );
1174 </code></pre></div>
1175
1176 <p>Free the buffer allocated by OpenType validator.</p>
1177 <h4>input</h4>
1178
1179 <table class="fields">
1180 <tr><td class="val" id="face">face</td><td class="desc">
1181 <p>A handle to the input face.</p>
1182 </td></tr>
1183 <tr><td class="val" id="table">table</td><td class="desc">
1184 <p>The pointer to the buffer that is allocated by <code><a href="ft2-ot_validation.html#ft_opentype_validate">FT_OpenType_Validate</a></code>.</p>
1185 </td></tr>
1186 </table>
1187
1188 <h4>note</h4>
1189
1190 <p>This function must be used to free the buffer allocated by <code><a href="ft2-ot_validation.html#ft_opentype_validate">FT_OpenType_Validate</a></code> only.</p>
1191 <hr>
1192
1193 <h2 id="ft_validate_otxxx">FT_VALIDATE_OTXXX<a class="headerlink" href="#ft_validate_otxxx" title="Permanent link">&para;</a></h2>
1194 <p>Defined in FT_OPENTYPE_VALIDATE_H (freetype/ftotval.h).</p>
1195 <div class = "codehilite"><pre><code>#<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_base">FT_VALIDATE_BASE</a>  0x0100
1196 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_gdef">FT_VALIDATE_GDEF</a>  0x0200
1197 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_gpos">FT_VALIDATE_GPOS</a>  0x0400
1198 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_gsub">FT_VALIDATE_GSUB</a>  0x0800
1199 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_jstf">FT_VALIDATE_JSTF</a>  0x1000
1200 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_math">FT_VALIDATE_MATH</a>  0x2000
1201
1202 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_ot">FT_VALIDATE_OT</a>  ( <a href="ft2-ot_validation.html#ft_validate_base">FT_VALIDATE_BASE</a> | \
1203                           <a href="ft2-ot_validation.html#ft_validate_gdef">FT_VALIDATE_GDEF</a> | \
1204                           <a href="ft2-ot_validation.html#ft_validate_gpos">FT_VALIDATE_GPOS</a> | \
1205                           <a href="ft2-ot_validation.html#ft_validate_gsub">FT_VALIDATE_GSUB</a> | \
1206                           <a href="ft2-ot_validation.html#ft_validate_jstf">FT_VALIDATE_JSTF</a> | \
1207                           <a href="ft2-ot_validation.html#ft_validate_math">FT_VALIDATE_MATH</a> )
1208 </code></pre></div>
1209
1210 <p>A list of bit-field constants used with <code><a href="ft2-ot_validation.html#ft_opentype_validate">FT_OpenType_Validate</a></code> to indicate which OpenType tables should be validated.</p>
1211 <h4>values</h4>
1212
1213 <table class="fields">
1214 <tr><td class="val" id="ft_validate_base">FT_VALIDATE_BASE</td><td class="desc">
1215 <p>Validate BASE table.</p>
1216 </td></tr>
1217 <tr><td class="val" id="ft_validate_gdef">FT_VALIDATE_GDEF</td><td class="desc">
1218 <p>Validate GDEF table.</p>
1219 </td></tr>
1220 <tr><td class="val" id="ft_validate_gpos">FT_VALIDATE_GPOS</td><td class="desc">
1221 <p>Validate GPOS table.</p>
1222 </td></tr>
1223 <tr><td class="val" id="ft_validate_gsub">FT_VALIDATE_GSUB</td><td class="desc">
1224 <p>Validate GSUB table.</p>
1225 </td></tr>
1226 <tr><td class="val" id="ft_validate_jstf">FT_VALIDATE_JSTF</td><td class="desc">
1227 <p>Validate JSTF table.</p>
1228 </td></tr>
1229 <tr><td class="val" id="ft_validate_math">FT_VALIDATE_MATH</td><td class="desc">
1230 <p>Validate MATH table.</p>
1231 </td></tr>
1232 <tr><td class="val" id="ft_validate_ot">FT_VALIDATE_OT</td><td class="desc">
1233 <p>Validate all OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF, MATH).</p>
1234 </td></tr>
1235 </table>
1236
1237 <hr>
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1288         <a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener">
1289           Material for MkDocs</a>
1290       </div>
1291
1292     </div>
1293   </div>
1294 </footer>
1295
1296     </div>
1297
1298       <script src="assets/javascripts/application.c33a9706.js"></script>
1299
1300       <script>app.initialize({version:"1.1",url:{base:"."}})</script>
1301
1302         <script src="javascripts/extra.js"></script>
1303
1304
1305   </body>
1306 </html>