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Font Formats - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-gasp_table.html" class="md-nav__link"> - Gasp Table - </a> - </li> - - - - </ul> - </nav> - </li> - - - - - - - - - - - - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_6" type="checkbox" id="__nav_6" > - - <label class="md-nav__link" for="__nav_6"> - Controlling FreeType Modules - <span class="md-nav__icon md-icon"></span> - </label> - <nav class="md-nav" aria-label="Controlling FreeType Modules" data-md-level="1"> - <label class="md-nav__title" for="__nav_6"> - <span class="md-nav__icon md-icon"></span> - Controlling FreeType Modules - </label> - <ul class="md-nav__list" data-md-scrollfix> - - - - - - <li class="md-nav__item"> - <a href="ft2-auto_hinter.html" class="md-nav__link"> - The auto-hinter - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-cff_driver.html" class="md-nav__link"> - The CFF driver - </a> - 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- <label class="md-nav__link" for="__nav_7"> - Cache Sub-System - <span class="md-nav__icon md-icon"></span> - </label> - <nav class="md-nav" aria-label="Cache Sub-System" data-md-level="1"> - <label class="md-nav__title" for="__nav_7"> - <span class="md-nav__icon md-icon"></span> - Cache Sub-System - </label> - <ul class="md-nav__list" data-md-scrollfix> - - - - - - <li class="md-nav__item"> - <a href="ft2-cache_subsystem.html" class="md-nav__link"> - Cache Sub-System - </a> - </li> - - - - </ul> - </nav> - </li> - - - - - - - - - - - - - - <li class="md-nav__item md-nav__item--active md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_8" type="checkbox" id="__nav_8" checked> - - <label class="md-nav__link" for="__nav_8"> - Support API - <span class="md-nav__icon md-icon"></span> - </label> - <nav class="md-nav" aria-label="Support API" data-md-level="1"> - <label class="md-nav__title" for="__nav_8"> - <span class="md-nav__icon md-icon"></span> - Support API - </label> - <ul class="md-nav__list" data-md-scrollfix> - - - - - - <li class="md-nav__item"> - <a href="ft2-computations.html" class="md-nav__link"> - Computations - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-list_processing.html" class="md-nav__link"> - List Processing - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-outline_processing.html" class="md-nav__link"> - Outline Processing - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-quick_advance.html" class="md-nav__link"> - Quick retrieval of advance values - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-bitmap_handling.html" class="md-nav__link"> - Bitmap Handling - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-raster.html" class="md-nav__link"> - Scanline Converter - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-glyph_stroker.html" class="md-nav__link"> - Glyph Stroker - </a> - 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External Debugging APIs - </a> - - -<nav class="md-nav md-nav--secondary" aria-label="Table of contents"> - - - - - - - <label class="md-nav__title" for="__toc"> - <span class="md-nav__icon md-icon"></span> - Table of contents - </label> - <ul class="md-nav__list" data-md-component="toc" 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_trace_set_level" class="md-nav__link"> - FT_Trace_Set_Level - </a> - -</li> - - <li class="md-nav__item"> - <a href="#ft_trace_set_default_level" class="md-nav__link"> - FT_Trace_Set_Default_Level - </a> - -</li> - - <li class="md-nav__item"> - <a href="#ft_custom_log_handler" class="md-nav__link"> - FT_Custom_Log_Handler - </a> - -</li> - - <li class="md-nav__item"> - <a href="#ft_set_log_handler" class="md-nav__link"> - FT_Set_Log_Handler - </a> - -</li> - - <li class="md-nav__item"> - <a href="#ft_set_default_log_handler" class="md-nav__link"> - FT_Set_Default_Log_Handler - </a> - -</li> - - </ul> - -</nav> - - </li> - - - - </ul> - </nav> - </li> - - - - - - - - - - - - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_9" type="checkbox" id="__nav_9" > - - <label class="md-nav__link" for="__nav_9"> - Error Codes - <span class="md-nav__icon md-icon"></span> - </label> - <nav class="md-nav" aria-label="Error Codes" data-md-level="1"> - <label class="md-nav__title" for="__nav_9"> - <span class="md-nav__icon md-icon"></span> - Error Codes - </label> - <ul class="md-nav__list" data-md-scrollfix> - - - - - - <li class="md-nav__item"> - <a href="ft2-error_enumerations.html" class="md-nav__link"> - Error Enumerations - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-error_code_values.html" class="md-nav__link"> - Error Code Values - </a> - </li> - - - - </ul> - </nav> - </li> - - - - - - - - - - - - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_10" type="checkbox" id="__nav_10" > - - <label class="md-nav__link" for="__nav_10"> - Miscellaneous - <span class="md-nav__icon md-icon"></span> - </label> - <nav class="md-nav" aria-label="Miscellaneous" data-md-level="1"> - <label class="md-nav__title" for="__nav_10"> - <span class="md-nav__icon md-icon"></span> - Miscellaneous - </label> - <ul class="md-nav__list" data-md-scrollfix> - - - - - - <li class="md-nav__item"> - <a href="ft2-gx_validation.html" class="md-nav__link"> - TrueTypeGX/AAT Validation - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-incremental.html" class="md-nav__link"> - Incremental Loading - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-truetype_engine.html" class="md-nav__link"> - The TrueType Engine - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-ot_validation.html" 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="sidebar" data-md-type="toc" > - <div class="md-sidebar__scrollwrap"> - <div class="md-sidebar__inner"> - -<nav class="md-nav md-nav--secondary" aria-label="Table of contents"> - - - - - - - <label class="md-nav__title" for="__toc"> - <span class="md-nav__icon md-icon"></span> - Table of contents - </label> - <ul class="md-nav__list" data-md-component="toc" 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_trace_set_level" class="md-nav__link"> - FT_Trace_Set_Level - </a> - -</li> - - <li class="md-nav__item"> - <a href="#ft_trace_set_default_level" class="md-nav__link"> - FT_Trace_Set_Default_Level - </a> - -</li> - - <li class="md-nav__item"> - <a href="#ft_custom_log_handler" class="md-nav__link"> - FT_Custom_Log_Handler - </a> - -</li> - - <li class="md-nav__item"> - <a href="#ft_set_log_handler" class="md-nav__link"> - FT_Set_Log_Handler - </a> - -</li> - - <li class="md-nav__item"> - <a href="#ft_set_default_log_handler" class="md-nav__link"> - FT_Set_Default_Log_Handler - </a> - -</li> - - </ul> - -</nav> - </div> - </div> - </div> - - - <div class="md-content" data-md-component="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#support-api">Support API</a> » External Debugging APIs</p> -<hr /> -<h1 id="external-debugging-apis">External Debugging APIs<a class="headerlink" href="#external-debugging-apis" title="Permanent link">¶</a></h1> -<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2> -<p>This section contains the declarations of public functions that enables fine control of what the <code>FT_DEBUG_LOGGING</code> macro outputs.</p> -<h2 id="ft_trace_set_level">FT_Trace_Set_Level<a class="headerlink" href="#ft_trace_set_level" title="Permanent link">¶</a></h2> -<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) - <b>FT_Trace_Set_Level</b>( <span class="keyword">const</span> <span class="keyword">char</span>* tracing_level ); -</code></pre></div> - -<p>Change the levels of tracing components of FreeType at run time.</p> -<h4>input</h4> -<table class="fields"> -<tr><td class="val" id="tracing_level">tracing_level</td><td class="desc"> -<p>New tracing value.</p> -</td></tr> -</table> - -<h4>example</h4> - -<p>The following call makes FreeType trace everything but the ‘memory’ component. -<div class="highlight"><pre><span></span><code>FT_Trace_Set_Level( "any:7 memory:0 ); -</code></pre></div></p> -<h4>note</h4> - -<p>This function does nothing if compilation option <code>FT_DEBUG_LOGGING</code> isn't set.</p> -<h4>since</h4> - -<p>2.11</p> -<hr> - -<h2 id="ft_trace_set_default_level">FT_Trace_Set_Default_Level<a class="headerlink" href="#ft_trace_set_default_level" title="Permanent link">¶</a></h2> -<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) - <b>FT_Trace_Set_Default_Level</b>( <span class="keyword">void</span> ); -</code></pre></div> - -<p>Reset tracing value of FreeType's components to the default value (i.e., to the value of the <code>FT2_DEBUG</code> environment value or to NULL if <code>FT2_DEBUG</code> is not set).</p> -<h4>note</h4> - -<p>This function does nothing if compilation option <code>FT_DEBUG_LOGGING</code> isn't set.</p> -<h4>since</h4> - -<p>2.11</p> -<hr> - -<h2 id="ft_custom_log_handler">FT_Custom_Log_Handler<a class="headerlink" href="#ft_custom_log_handler" title="Permanent link">¶</a></h2> -<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">void</span> - (*<b>FT_Custom_Log_Handler</b>)( <span class="keyword">const</span> <span class="keyword">char</span>* ft_component, - <span class="keyword">const</span> <span class="keyword">char</span>* fmt, - va_list args ); -</code></pre></div> - -<p>A function typedef that is used to handle the logging of tracing and debug messages on a file system.</p> -<h4>input</h4> -<table class="fields"> -<tr><td class="val" id="ft_component">ft_component</td><td class="desc"> -<p>The name of <code>FT_COMPONENT</code> from which the current debug or error message is produced.</p> -</td></tr> -<tr><td class="val" id="fmt">fmt</td><td class="desc"> -<p>Actual debug or tracing message.</p> -</td></tr> -<tr><td class="val" id="args">args</td><td class="desc"> -<p>Arguments of debug or tracing messages.</p> -</td></tr> -</table> - -<h4>since</h4> - -<p>2.11</p> -<hr> - -<h2 id="ft_set_log_handler">FT_Set_Log_Handler<a class="headerlink" href="#ft_set_log_handler" title="Permanent link">¶</a></h2> -<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) - <b>FT_Set_Log_Handler</b>( <a href="ft2-debugging_apis.html#ft_custom_log_handler">FT_Custom_Log_Handler</a> handler ); -</code></pre></div> - -<p>A function to set a custom log handler.</p> -<h4>input</h4> -<table class="fields"> -<tr><td class="val" id="handler">handler</td><td class="desc"> -<p>New logging function.</p> -</td></tr> -</table> - -<h4>note</h4> - -<p>This function does nothing if compilation option <code>FT_DEBUG_LOGGING</code> isn't set.</p> -<h4>since</h4> - -<p>2.11</p> -<hr> - -<h2 id="ft_set_default_log_handler">FT_Set_Default_Log_Handler<a class="headerlink" href="#ft_set_default_log_handler" title="Permanent link">¶</a></h2> -<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) - <b>FT_Set_Default_Log_Handler</b>( <span class="keyword">void</span> ); -</code></pre></div> - -<p>A function to undo the effect of <code><a href="ft2-debugging_apis.html#ft_set_log_handler">FT_Set_Log_Handler</a></code>, resetting the log handler to FreeType's built-in version.</p> -<h4>note</h4> - -<p>This function does nothing if compilation option <code>FT_DEBUG_LOGGING</code> isn't set.</p> -<h4>since</h4> - -<p>2.11</p> -<hr> - - - - - - - - </article> - </div> - </div> - - </main> - - -<footer class="md-footer"> - - <nav class="md-footer__inner md-grid" aria-label="Footer"> - - - <a href="ft2-bzip2.html" class="md-footer__link md-footer__link--prev" aria-label="Previous: BZIP2 Streams" rel="prev"> - <div class="md-footer__button md-icon"> - <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12z"/></svg> - </div> - <div class="md-footer__title"> - <div class="md-ellipsis"> - <span class="md-footer__direction"> - 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The PCF driver - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-properties.html" class="md-nav__link"> - Driver properties - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-parameter_tags.html" class="md-nav__link"> - Parameter Tags - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-lcd_rendering.html" class="md-nav__link"> - Subpixel Rendering - </a> - </li> - - - - </ul> - </nav> - </li> - - - - - - - - - - - - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7" type="checkbox" id="__nav_7" > - - <label class="md-nav__link" for="__nav_7"> - Cache Sub-System - <span class="md-nav__icon md-icon"></span> - </label> - <nav class="md-nav" aria-label="Cache Sub-System" data-md-level="1"> - <label class="md-nav__title" for="__nav_7"> - <span class="md-nav__icon md-icon"></span> - Cache Sub-System - </label> - <ul class="md-nav__list" data-md-scrollfix> - - - - - 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<a href="ft2-lzw.html" class="md-nav__link"> - LZW Streams - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-bzip2.html" class="md-nav__link"> - BZIP2 Streams - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-debugging_apis.html" class="md-nav__link"> - External Debugging APIs - </a> - </li> - - - - </ul> - </nav> - </li> - - - - - - - - - - - - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_9" type="checkbox" id="__nav_9" > - - <label class="md-nav__link" for="__nav_9"> - Error Codes - <span class="md-nav__icon md-icon"></span> - </label> - <nav class="md-nav" aria-label="Error Codes" data-md-level="1"> - <label class="md-nav__title" for="__nav_9"> - <span class="md-nav__icon md-icon"></span> - Error Codes - </label> - <ul class="md-nav__list" data-md-scrollfix> - - - - - - <li class="md-nav__item"> - <a href="ft2-error_enumerations.html" class="md-nav__link"> - Error Enumerations - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-error_code_values.html" class="md-nav__link"> - Error Code Values - </a> - </li> - - - - </ul> - </nav> - </li> - - - - - - - - - - - - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_10" type="checkbox" id="__nav_10" > - - <label class="md-nav__link" for="__nav_10"> - Miscellaneous - <span class="md-nav__icon md-icon"></span> - </label> - <nav class="md-nav" aria-label="Miscellaneous" data-md-level="1"> - <label class="md-nav__title" for="__nav_10"> - <span class="md-nav__icon md-icon"></span> - Miscellaneous - </label> - <ul class="md-nav__list" data-md-scrollfix> - - - - - - <li class="md-nav__item"> - <a href="ft2-gx_validation.html" class="md-nav__link"> - TrueTypeGX/AAT Validation - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-incremental.html" class="md-nav__link"> - Incremental Loading - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-truetype_engine.html" class="md-nav__link"> - The TrueType Engine - </a> - </li> - - - - - - - - <li class="md-nav__item"> - <a href="ft2-ot_validation.html" 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="sidebar" data-md-type="toc" > - <div class="md-sidebar__scrollwrap"> - <div class="md-sidebar__inner"> - -<nav class="md-nav md-nav--secondary" aria-label="Table of contents"> - - - - - - - <label class="md-nav__title" for="__toc"> - <span class="md-nav__icon md-icon"></span> - Table of contents - </label> - <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> - - <li class="md-nav__item"> - <a href="#synopsis" class="md-nav__link"> - Synopsis - </a> - -</li> - - </ul> - -</nav> - </div> - </div> - </div> - - - <div class="md-content" data-md-component="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#general-remarks">General Remarks</a> » Preamble</p> -<hr /> -<h1 id="preamble">Preamble<a class="headerlink" href="#preamble" title="Permanent link">¶</a></h1> -<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2> -<p>FreeType is a library that provides access to glyphs in font files. It scales the glyph images and their metrics to a requested size, and it rasterizes the glyph images to produce pixel or subpixel alpha coverage bitmaps.</p> -<p>Note that FreeType is <em>not</em> a text layout engine. You have to use higher-level libraries like HarfBuzz, Pango, or ICU for that.</p> -<p>Note also that FreeType does <em>not</em> perform alpha blending or compositing the resulting bitmaps or pixmaps by itself. Use your favourite graphics library (for example, Cairo or Skia) to further process FreeType's output.</p> - - - - - - - - </article> - </div> - </div> - - </main> - - -<footer class="md-footer"> - - <nav class="md-footer__inner md-grid" aria-label="Footer"> - - - <a href="ft2-index.html" class="md-footer__link md-footer__link--prev" aria-label="Previous: Index" rel="prev"> - <div class="md-footer__button md-icon"> - <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12z"/></svg> - </div> - <div class="md-footer__title"> - <div class="md-ellipsis"> - <span class="md-footer__direction"> - Previous - </span> - Index - </div> - </div> - </a> - - - - <a href="ft2-header_inclusion.html" class="md-footer__link md-footer__link--next" aria-label="Next: FreeType's header inclusion scheme" rel="next"> - <div class="md-footer__title"> - <div class="md-ellipsis"> - <span class="md-footer__direction"> - Next - </span> - FreeType's header inclusion scheme - </div> - </div> - <div class="md-footer__button md-icon"> - <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4z"/></svg> - </div> - </a> - - </nav> - - <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 2021 <a href = "https://www.freetype.org/license.html">The FreeType Project</a>. - </div> - - Made with - <a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener"> - Material for MkDocs - </a> - - </div> - - </div> - </div> -</footer> - - </div> - <div class="md-dialog" data-md-component="dialog"> - <div class="md-dialog__inner md-typeset"></div> - </div> - <script id="__config" type="application/json">{"base": ".", "features": [], "translations": {"clipboard.copy": "Copy to clipboard", "clipboard.copied": "Copied to clipboard", "search.config.lang": "en", "search.config.pipeline": "trimmer, stopWordFilter", "search.config.separator": "[\\s\\-]+", "search.placeholder": "Search", "search.result.placeholder": "Type to start searching", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.term.missing": "Missing", "select.version.title": "Select version"}, "search": "assets/javascripts/workers/search.477d984a.min.js", "version": null}</script> - - - <script src="assets/javascripts/bundle.82b56eb2.min.js"></script> - - <script src="javascripts/extra.js"></script> - - - </body> -</html>
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