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+ </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> + + + + + + + + + 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