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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"> <a href="ft2-gx_validation.html" title="TrueTypeGX/AAT Validation" class="md-nav__link"> TrueTypeGX/AAT Validation </a> </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 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"> OpenType Validation </label> <a href="ft2-ot_validation.html" title="OpenType Validation" class="md-nav__link md-nav__link--active"> OpenType 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_opentype_validate" class="md-nav__link"> FT_OpenType_Validate </a> </li> <li class="md-nav__item"> <a href="#ft_opentype_free" class="md-nav__link"> FT_OpenType_Free </a> </li> <li class="md-nav__item"> <a href="#ft_validate_otxxx" class="md-nav__link"> FT_VALIDATE_OTXXX </a> </li> </ul> </nav> </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_opentype_validate" class="md-nav__link"> FT_OpenType_Validate </a> </li> <li class="md-nav__item"> <a href="#ft_opentype_free" class="md-nav__link"> FT_OpenType_Free </a> </li> <li class="md-nav__item"> <a href="#ft_validate_otxxx" class="md-nav__link"> FT_VALIDATE_OTXXX </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> » OpenType Validation</p> <hr /> <h1 id="opentype-validation">OpenType Validation<a class="headerlink" href="#opentype-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 OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF, MATH).</p> <h2 id="ft_opentype_validate">FT_OpenType_Validate<a class="headerlink" href="#ft_opentype_validate" title="Permanent link">¶</a></h2> <p>Defined in FT_OPENTYPE_VALIDATE_H (freetype/ftotval.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> ) <b>FT_OpenType_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> *BASE_table, <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a> *GDEF_table, <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a> *GPOS_table, <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a> *GSUB_table, <a href="ft2-basic_types.html#ft_bytes">FT_Bytes</a> *JSTF_table ); </code></pre></div> <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> <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-ot_validation.html#ft_validate_otxxx">FT_VALIDATE_OTXXX</a></code> for possible values.</p> </td></tr> </table> <h4>output</h4> <table class="fields"> <tr><td class="val" id="base_table">BASE_table</td><td class="desc"> <p>A pointer to the BASE table.</p> </td></tr> <tr><td class="val" id="gdef_table">GDEF_table</td><td class="desc"> <p>A pointer to the GDEF table.</p> </td></tr> <tr><td class="val" id="gpos_table">GPOS_table</td><td class="desc"> <p>A pointer to the GPOS table.</p> </td></tr> <tr><td class="val" id="gsub_table">GSUB_table</td><td class="desc"> <p>A pointer to the GSUB table.</p> </td></tr> <tr><td class="val" id="jstf_table">JSTF_table</td><td class="desc"> <p>A pointer to the JSTF table.</p> </td></tr> </table> <h4>return</h4> <p>FreeType error code. 0 means success.</p> <h4>note</h4> <p>This function only works with OpenType fonts, returning an error otherwise.</p> <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> <hr> <h2 id="ft_opentype_free">FT_OpenType_Free<a class="headerlink" href="#ft_opentype_free" title="Permanent link">¶</a></h2> <p>Defined in FT_OPENTYPE_VALIDATE_H (freetype/ftotval.h).</p> <div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) <b>FT_OpenType_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 OpenType 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-ot_validation.html#ft_opentype_validate">FT_OpenType_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-ot_validation.html#ft_opentype_validate">FT_OpenType_Validate</a></code> only.</p> <hr> <h2 id="ft_validate_otxxx">FT_VALIDATE_OTXXX<a class="headerlink" href="#ft_validate_otxxx" title="Permanent link">¶</a></h2> <p>Defined in FT_OPENTYPE_VALIDATE_H (freetype/ftotval.h).</p> <div class = "codehilite"><pre><code>#<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_base">FT_VALIDATE_BASE</a> 0x0100 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_gdef">FT_VALIDATE_GDEF</a> 0x0200 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_gpos">FT_VALIDATE_GPOS</a> 0x0400 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_gsub">FT_VALIDATE_GSUB</a> 0x0800 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_jstf">FT_VALIDATE_JSTF</a> 0x1000 #<span class="keyword">define</span> <a href="ft2-ot_validation.html#ft_validate_math">FT_VALIDATE_MATH</a> 0x2000 #<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> | \ <a href="ft2-ot_validation.html#ft_validate_gdef">FT_VALIDATE_GDEF</a> | \ <a href="ft2-ot_validation.html#ft_validate_gpos">FT_VALIDATE_GPOS</a> | \ <a href="ft2-ot_validation.html#ft_validate_gsub">FT_VALIDATE_GSUB</a> | \ <a href="ft2-ot_validation.html#ft_validate_jstf">FT_VALIDATE_JSTF</a> | \ <a href="ft2-ot_validation.html#ft_validate_math">FT_VALIDATE_MATH</a> ) </code></pre></div> <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> <h4>values</h4> <table class="fields"> <tr><td class="val" id="ft_validate_base">FT_VALIDATE_BASE</td><td class="desc"> <p>Validate BASE table.</p> </td></tr> <tr><td class="val" id="ft_validate_gdef">FT_VALIDATE_GDEF</td><td class="desc"> <p>Validate GDEF table.</p> </td></tr> <tr><td class="val" id="ft_validate_gpos">FT_VALIDATE_GPOS</td><td class="desc"> <p>Validate GPOS table.</p> </td></tr> <tr><td class="val" id="ft_validate_gsub">FT_VALIDATE_GSUB</td><td class="desc"> <p>Validate GSUB table.</p> </td></tr> <tr><td class="val" id="ft_validate_jstf">FT_VALIDATE_JSTF</td><td class="desc"> <p>Validate JSTF table.</p> </td></tr> <tr><td class="val" id="ft_validate_math">FT_VALIDATE_MATH</td><td class="desc"> <p>Validate MATH table.</p> </td></tr> <tr><td class="val" id="ft_validate_ot">FT_VALIDATE_OT</td><td class="desc"> <p>Validate all OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF, MATH).</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-truetype_engine.html" title="The TrueType 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