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<!doctype html> <html lang="en" class="no-js"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width,initial-scale=1"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <meta name="description" content="API Reference Documentation for FreeType-2.10.4"> <meta name="author" content="FreeType Contributors"> <meta name="lang:clipboard.copy" content="Copy to clipboard"> <meta name="lang:clipboard.copied" content="Copied to clipboard"> <meta name="lang:search.language" content="en"> <meta name="lang:search.pipeline.stopwords" content="True"> <meta name="lang:search.pipeline.trimmer" content="True"> <meta name="lang:search.result.none" content="No matching documents"> <meta name="lang:search.result.one" content="1 matching document"> <meta name="lang:search.result.other" content="# matching documents"> <meta name="lang:search.tokenizer" content="[\s\-]+"> <link rel="shortcut icon" href="images/favico.ico"> <meta name="generator" content="mkdocs-1.1, 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Error Code Values </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--active md-nav__item--nested"> <input class="md-toggle md-nav__toggle" data-md-toggle="nav-10" type="checkbox" id="nav-10" checked> <label class="md-nav__link" for="nav-10"> Miscellaneous </label> <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> <label class="md-nav__title" for="nav-10"> Miscellaneous </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item md-nav__item--active"> <input class="md-toggle md-nav__toggle" data-md-toggle="toc" type="checkbox" id="__toc"> <label class="md-nav__link md-nav__link--active" for="__toc"> TrueTypeGX/AAT Validation </label> <a href="ft2-gx_validation.html" title="TrueTypeGX/AAT Validation" class="md-nav__link md-nav__link--active"> TrueTypeGX/AAT Validation </a> <nav class="md-nav md-nav--secondary"> <label class="md-nav__title" for="__toc">Table of contents</label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="#synopsis" class="md-nav__link"> Synopsis </a> </li> <li class="md-nav__item"> <a href="#ft_truetypegx_validate" class="md-nav__link"> FT_TrueTypeGX_Validate </a> </li> <li class="md-nav__item"> <a href="#ft_truetypegx_free" class="md-nav__link"> FT_TrueTypeGX_Free </a> </li> <li class="md-nav__item"> <a href="#ft_classickern_validate" class="md-nav__link"> FT_ClassicKern_Validate </a> </li> <li class="md-nav__item"> <a href="#ft_classickern_free" class="md-nav__link"> FT_ClassicKern_Free </a> </li> <li class="md-nav__item"> <a href="#ft_validate_gx_length" class="md-nav__link"> FT_VALIDATE_GX_LENGTH </a> </li> <li class="md-nav__item"> <a href="#ft_validate_gxxxx" class="md-nav__link"> FT_VALIDATE_GXXXX </a> </li> <li class="md-nav__item"> <a href="#ft_validate_ckernxxx" class="md-nav__link"> FT_VALIDATE_CKERNXXX </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="ft2-incremental.html" title="Incremental Loading" class="md-nav__link"> Incremental Loading </a> </li> <li class="md-nav__item"> <a href="ft2-truetype_engine.html" title="The TrueType Engine" class="md-nav__link"> The TrueType Engine </a> </li> <li class="md-nav__item"> <a href="ft2-ot_validation.html" title="OpenType Validation" class="md-nav__link"> OpenType Validation </a> </li> </ul> </nav> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component="toc"> <div class="md-sidebar__scrollwrap"> <div class="md-sidebar__inner"> <nav class="md-nav md-nav--secondary"> <label class="md-nav__title" for="__toc">Table of contents</label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="#synopsis" class="md-nav__link"> Synopsis </a> </li> <li class="md-nav__item"> <a href="#ft_truetypegx_validate" class="md-nav__link"> FT_TrueTypeGX_Validate </a> </li> <li class="md-nav__item"> <a href="#ft_truetypegx_free" class="md-nav__link"> FT_TrueTypeGX_Free </a> </li> <li class="md-nav__item"> <a href="#ft_classickern_validate" class="md-nav__link"> FT_ClassicKern_Validate </a> </li> <li class="md-nav__item"> <a href="#ft_classickern_free" class="md-nav__link"> FT_ClassicKern_Free </a> </li> <li class="md-nav__item"> <a href="#ft_validate_gx_length" class="md-nav__link"> FT_VALIDATE_GX_LENGTH </a> </li> <li class="md-nav__item"> <a href="#ft_validate_gxxxx" class="md-nav__link"> FT_VALIDATE_GXXXX </a> </li> <li class="md-nav__item"> <a href="#ft_validate_ckernxxx" class="md-nav__link"> FT_VALIDATE_CKERNXXX </a> </li> </ul> </nav> </div> </div> </div> <div class="md-content"> <article class="md-content__inner md-typeset"> <p><a href="https://www.freetype.org">FreeType</a> » <a href="../">Docs</a> » <a href="index.html#miscellaneous">Miscellaneous</a> » TrueTypeGX/AAT Validation</p> <hr /> <h1 id="truetypegxaat-validation">TrueTypeGX/AAT Validation<a class="headerlink" href="#truetypegxaat-validation" title="Permanent link">¶</a></h1> <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2> <p>This section contains the declaration of functions to validate some TrueTypeGX tables (feat, mort, morx, bsln, just, kern, opbd, trak, prop, lcar).</p> <h2 id="ft_truetypegx_validate">FT_TrueTypeGX_Validate<a class="headerlink" href="#ft_truetypegx_validate" title="Permanent link">¶</a></h2> <p>Defined in FT_GX_VALIDATE_H (freetype/ftgxval.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> ) <b>FT_TrueTypeGX_Validate</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a> face, <a href="ft2-basic_types.html#ft_uint">FT_UInt</a> validation_flags, <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a> tables[<a href="ft2-gx_validation.html#ft_validate_gx_length">FT_VALIDATE_GX_LENGTH</a>], <a href="ft2-basic_types.html#ft_uint">FT_UInt</a> table_length ); </code></pre></div> <p>Validate various TrueTypeGX 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> <h4>input</h4> <table class="fields"> <tr><td class="val" id="face">face</td><td class="desc"> <p>A handle to the input face.</p> </td></tr> <tr><td class="val" id="validation_flags">validation_flags</td><td class="desc"> <p>A bit field that specifies the tables to be validated. See <code><a href="ft2-gx_validation.html#ft_validate_gxxxx">FT_VALIDATE_GXXXX</a></code> for possible values.</p> </td></tr> <tr><td class="val" id="table_length">table_length</td><td class="desc"> <p>The size of the <code>tables</code> array. Normally, <code><a href="ft2-gx_validation.html#ft_validate_gx_length">FT_VALIDATE_GX_LENGTH</a></code> should be passed.</p> </td></tr> </table> <h4>output</h4> <table class="fields"> <tr><td class="val" id="tables">tables</td><td class="desc"> <p>The array where all validated sfnt tables are stored. The array itself must be allocated by a client.</p> </td></tr> </table> <h4>return</h4> <p>FreeType error code. 0 means success.</p> <h4>note</h4> <p>This function only works with TrueTypeGX fonts, returning an error otherwise.</p> <p>After use, the application should deallocate the buffers pointed to by each <code>tables</code> element, by calling <code><a href="ft2-gx_validation.html#ft_truetypegx_free">FT_TrueTypeGX_Free</a></code>. A <code>NULL</code> value indicates that the table either doesn't exist in the font, the application hasn't asked for validation, or the validator doesn't have the ability to validate the sfnt table.</p> <hr> <h2 id="ft_truetypegx_free">FT_TrueTypeGX_Free<a class="headerlink" href="#ft_truetypegx_free" title="Permanent link">¶</a></h2> <p>Defined in FT_GX_VALIDATE_H (freetype/ftgxval.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) <b>FT_TrueTypeGX_Free</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a> face, <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a> table ); </code></pre></div> <p>Free the buffer allocated by TrueTypeGX validator.</p> <h4>input</h4> <table class="fields"> <tr><td class="val" id="face">face</td><td class="desc"> <p>A handle to the input face.</p> </td></tr> <tr><td class="val" id="table">table</td><td class="desc"> <p>The pointer to the buffer allocated by <code><a href="ft2-gx_validation.html#ft_truetypegx_validate">FT_TrueTypeGX_Validate</a></code>.</p> </td></tr> </table> <h4>note</h4> <p>This function must be used to free the buffer allocated by <code><a href="ft2-gx_validation.html#ft_truetypegx_validate">FT_TrueTypeGX_Validate</a></code> only.</p> <hr> <h2 id="ft_classickern_validate">FT_ClassicKern_Validate<a class="headerlink" href="#ft_classickern_validate" title="Permanent link">¶</a></h2> <p>Defined in FT_GX_VALIDATE_H (freetype/ftgxval.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> ) <b>FT_ClassicKern_Validate</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a> face, <a href="ft2-basic_types.html#ft_uint">FT_UInt</a> validation_flags, <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a> *ckern_table ); </code></pre></div> <p>Validate classic (16-bit format) kern table to assure that the 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> <p>The ‘kern’ table validator in <code><a href="ft2-gx_validation.html#ft_truetypegx_validate">FT_TrueTypeGX_Validate</a></code> deals with both the new 32-bit format and the classic 16-bit format, while FT_ClassicKern_Validate only supports the classic 16-bit format.</p> <h4>input</h4> <table class="fields"> <tr><td class="val" id="face">face</td><td class="desc"> <p>A handle to the input face.</p> </td></tr> <tr><td class="val" id="validation_flags">validation_flags</td><td class="desc"> <p>A bit field that specifies the dialect to be validated. See <code><a href="ft2-gx_validation.html#ft_validate_ckernxxx">FT_VALIDATE_CKERNXXX</a></code> for possible values.</p> </td></tr> </table> <h4>output</h4> <table class="fields"> <tr><td class="val" id="ckern_table">ckern_table</td><td class="desc"> <p>A pointer to the kern table.</p> </td></tr> </table> <h4>return</h4> <p>FreeType error code. 0 means success.</p> <h4>note</h4> <p>After use, the application should deallocate the buffers pointed to by <code>ckern_table</code>, by calling <code><a href="ft2-gx_validation.html#ft_classickern_free">FT_ClassicKern_Free</a></code>. A <code>NULL</code> value indicates that the table doesn't exist in the font.</p> <hr> <h2 id="ft_classickern_free">FT_ClassicKern_Free<a class="headerlink" href="#ft_classickern_free" title="Permanent link">¶</a></h2> <p>Defined in FT_GX_VALIDATE_H (freetype/ftgxval.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) <b>FT_ClassicKern_Free</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a> face, <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a> table ); </code></pre></div> <p>Free the buffer allocated by classic Kern validator.</p> <h4>input</h4> <table class="fields"> <tr><td class="val" id="face">face</td><td class="desc"> <p>A handle to the input face.</p> </td></tr> <tr><td class="val" id="table">table</td><td class="desc"> <p>The pointer to the buffer that is allocated by <code><a href="ft2-gx_validation.html#ft_classickern_validate">FT_ClassicKern_Validate</a></code>.</p> </td></tr> </table> <h4>note</h4> <p>This function must be used to free the buffer allocated by <code><a href="ft2-gx_validation.html#ft_classickern_validate">FT_ClassicKern_Validate</a></code> only.</p> <hr> <h2 id="ft_validate_gx_length">FT_VALIDATE_GX_LENGTH<a class="headerlink" href="#ft_validate_gx_length" title="Permanent link">¶</a></h2> <p>Defined in FT_GX_VALIDATE_H (freetype/ftgxval.h).</p> <div class = "codehilite"><pre><code>#<span class="keyword">define</span> <b>FT_VALIDATE_GX_LENGTH</b> ( FT_VALIDATE_GX_LAST_INDEX + 1 ) </code></pre></div> <p>The number of tables checked in this module. Use it as a parameter for the <code>table-length</code> argument of function <code><a href="ft2-gx_validation.html#ft_truetypegx_validate">FT_TrueTypeGX_Validate</a></code>.</p> <hr> <h2 id="ft_validate_gxxxx">FT_VALIDATE_GXXXX<a class="headerlink" href="#ft_validate_gxxxx" title="Permanent link">¶</a></h2> <p>Defined in FT_GX_VALIDATE_H (freetype/ftgxval.h).</p> <div class = "codehilite"><pre><code>#<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_feat">FT_VALIDATE_feat</a> FT_VALIDATE_GX_BITFIELD( feat ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_mort">FT_VALIDATE_mort</a> FT_VALIDATE_GX_BITFIELD( mort ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_morx">FT_VALIDATE_morx</a> FT_VALIDATE_GX_BITFIELD( morx ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_bsln">FT_VALIDATE_bsln</a> FT_VALIDATE_GX_BITFIELD( bsln ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_just">FT_VALIDATE_just</a> FT_VALIDATE_GX_BITFIELD( just ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_kern">FT_VALIDATE_kern</a> FT_VALIDATE_GX_BITFIELD( kern ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_opbd">FT_VALIDATE_opbd</a> FT_VALIDATE_GX_BITFIELD( opbd ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_trak">FT_VALIDATE_trak</a> FT_VALIDATE_GX_BITFIELD( trak ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_prop">FT_VALIDATE_prop</a> FT_VALIDATE_GX_BITFIELD( prop ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_lcar">FT_VALIDATE_lcar</a> FT_VALIDATE_GX_BITFIELD( lcar ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_gx">FT_VALIDATE_GX</a> ( <a href="ft2-gx_validation.html#ft_validate_feat">FT_VALIDATE_feat</a> | \ <a href="ft2-gx_validation.html#ft_validate_mort">FT_VALIDATE_mort</a> | \ <a href="ft2-gx_validation.html#ft_validate_morx">FT_VALIDATE_morx</a> | \ <a href="ft2-gx_validation.html#ft_validate_bsln">FT_VALIDATE_bsln</a> | \ <a href="ft2-gx_validation.html#ft_validate_just">FT_VALIDATE_just</a> | \ <a href="ft2-gx_validation.html#ft_validate_kern">FT_VALIDATE_kern</a> | \ <a href="ft2-gx_validation.html#ft_validate_opbd">FT_VALIDATE_opbd</a> | \ <a href="ft2-gx_validation.html#ft_validate_trak">FT_VALIDATE_trak</a> | \ <a href="ft2-gx_validation.html#ft_validate_prop">FT_VALIDATE_prop</a> | \ <a href="ft2-gx_validation.html#ft_validate_lcar">FT_VALIDATE_lcar</a> ) </code></pre></div> <p>A list of bit-field constants used with <code><a href="ft2-gx_validation.html#ft_truetypegx_validate">FT_TrueTypeGX_Validate</a></code> to indicate which TrueTypeGX/AAT Type tables should be validated.</p> <h4>values</h4> <table class="fields"> <tr><td class="val" id="ft_validate_feat">FT_VALIDATE_feat</td><td class="desc"> <p>Validate ‘feat’ table.</p> </td></tr> <tr><td class="val" id="ft_validate_mort">FT_VALIDATE_mort</td><td class="desc"> <p>Validate ‘mort’ table.</p> </td></tr> <tr><td class="val" id="ft_validate_morx">FT_VALIDATE_morx</td><td class="desc"> <p>Validate ‘morx’ table.</p> </td></tr> <tr><td class="val" id="ft_validate_bsln">FT_VALIDATE_bsln</td><td class="desc"> <p>Validate ‘bsln’ table.</p> </td></tr> <tr><td class="val" id="ft_validate_just">FT_VALIDATE_just</td><td class="desc"> <p>Validate ‘just’ table.</p> </td></tr> <tr><td class="val" id="ft_validate_kern">FT_VALIDATE_kern</td><td class="desc"> <p>Validate ‘kern’ table.</p> </td></tr> <tr><td class="val" id="ft_validate_opbd">FT_VALIDATE_opbd</td><td class="desc"> <p>Validate ‘opbd’ table.</p> </td></tr> <tr><td class="val" id="ft_validate_trak">FT_VALIDATE_trak</td><td class="desc"> <p>Validate ‘trak’ table.</p> </td></tr> <tr><td class="val" id="ft_validate_prop">FT_VALIDATE_prop</td><td class="desc"> <p>Validate ‘prop’ table.</p> </td></tr> <tr><td class="val" id="ft_validate_lcar">FT_VALIDATE_lcar</td><td class="desc"> <p>Validate ‘lcar’ table.</p> </td></tr> <tr><td class="val" id="ft_validate_gx">FT_VALIDATE_GX</td><td class="desc"> <p>Validate all TrueTypeGX tables (feat, mort, morx, bsln, just, kern, opbd, trak, prop and lcar).</p> </td></tr> </table> <hr> <h2 id="ft_validate_ckernxxx">FT_VALIDATE_CKERNXXX<a class="headerlink" href="#ft_validate_ckernxxx" title="Permanent link">¶</a></h2> <p>Defined in FT_GX_VALIDATE_H (freetype/ftgxval.h).</p> <div class = "codehilite"><pre><code>#<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_ms">FT_VALIDATE_MS</a> ( FT_VALIDATE_GX_START << 0 ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_apple">FT_VALIDATE_APPLE</a> ( FT_VALIDATE_GX_START << 1 ) #<span class="keyword">define</span> <a href="ft2-gx_validation.html#ft_validate_ckern">FT_VALIDATE_CKERN</a> ( <a href="ft2-gx_validation.html#ft_validate_ms">FT_VALIDATE_MS</a> | <a href="ft2-gx_validation.html#ft_validate_apple">FT_VALIDATE_APPLE</a> ) </code></pre></div> <p>A list of bit-field constants used with <code><a href="ft2-gx_validation.html#ft_classickern_validate">FT_ClassicKern_Validate</a></code> to indicate the classic kern dialect or dialects. If the selected type doesn't fit, <code><a href="ft2-gx_validation.html#ft_classickern_validate">FT_ClassicKern_Validate</a></code> regards the table as invalid.</p> <h4>values</h4> <table class="fields"> <tr><td class="val" id="ft_validate_ms">FT_VALIDATE_MS</td><td class="desc"> <p>Handle the ‘kern’ table as a classic Microsoft kern table.</p> </td></tr> <tr><td class="val" id="ft_validate_apple">FT_VALIDATE_APPLE</td><td class="desc"> <p>Handle the ‘kern’ table as a classic Apple kern table.</p> </td></tr> <tr><td class="val" id="ft_validate_ckern">FT_VALIDATE_CKERN</td><td class="desc"> <p>Handle the ‘kern’ as either classic Apple or Microsoft kern table.</p> </td></tr> </table> <hr> </article> </div> </div> </main> <footer class="md-footer"> <div class="md-footer-nav"> <nav class="md-footer-nav__inner md-grid"> <a href="ft2-error_code_values.html" title="Error Code Values" class="md-flex md-footer-nav__link md-footer-nav__link--prev" rel="prev"> <div class="md-flex__cell md-flex__cell--shrink"> <i class="md-icon md-icon--arrow-back md-footer-nav__button"></i> </div> <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> <span class="md-flex__ellipsis"> <span class="md-footer-nav__direction"> Previous </span> Error Code Values </span> </div> </a> <a href="ft2-incremental.html" title="Incremental Loading" class="md-flex md-footer-nav__link md-footer-nav__link--next" rel="next"> <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> <span class="md-flex__ellipsis"> <span class="md-footer-nav__direction"> Next </span> Incremental Loading </span> </div> <div class="md-flex__cell md-flex__cell--shrink"> <i class="md-icon md-icon--arrow-forward md-footer-nav__button"></i> </div> </a> </nav> </div> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class="md-footer-copyright"> <div class="md-footer-copyright__highlight"> Copyright 2020 <a href = "https://www.freetype.org/license.html">The FreeType Project</a>. </div> powered by <a href="https://www.mkdocs.org" target="_blank" rel="noopener">MkDocs</a> and <a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener"> Material for MkDocs</a> </div> </div> </div> </footer> </div> <script src="assets/javascripts/application.c33a9706.js"></script> <script>app.initialize({version:"1.1",url:{base:"."}})</script> <script src="javascripts/extra.js"></script> </body> </html>