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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>hb-ot-metrics: HarfBuzz Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="HarfBuzz Manual"> <link rel="up" href="ch13.html" title="OpenType API"> <link rel="prev" href="harfbuzz-hb-ot-meta.html" title="hb-ot-meta"> <link rel="next" href="harfbuzz-hb-ot-name.html" title="hb-ot-name"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#harfbuzz-hb-ot-metrics.description" class="shortcut">Description</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="ch13.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="harfbuzz-hb-ot-meta.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="harfbuzz-hb-ot-name.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="harfbuzz-hb-ot-metrics"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="harfbuzz-hb-ot-metrics.top_of_page"></a>hb-ot-metrics</span></h2> <p>hb-ot-metrics — OpenType Metrics</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="harfbuzz-hb-ot-metrics.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="function_type"> <a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a> </td> <td class="function_name"> <a class="link" href="harfbuzz-hb-ot-metrics.html#hb-ot-metrics-get-position" title="hb_ot_metrics_get_position ()">hb_ot_metrics_get_position</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">float</span> </td> <td class="function_name"> <a class="link" href="harfbuzz-hb-ot-metrics.html#hb-ot-metrics-get-variation" title="hb_ot_metrics_get_variation ()">hb_ot_metrics_get_variation</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="returnvalue">hb_position_t</span></a> </td> <td class="function_name"> <a class="link" href="harfbuzz-hb-ot-metrics.html#hb-ot-metrics-get-x-variation" title="hb_ot_metrics_get_x_variation ()">hb_ot_metrics_get_x_variation</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="returnvalue">hb_position_t</span></a> </td> <td class="function_name"> <a class="link" href="harfbuzz-hb-ot-metrics.html#hb-ot-metrics-get-y-variation" title="hb_ot_metrics_get_y_variation ()">hb_ot_metrics_get_y_variation</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="harfbuzz-hb-ot-metrics.other"></a><h2>Types and Values</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="other_proto_type"> <col class="other_proto_name"> </colgroup> <tbody><tr> <td class="datatype_keyword">enum</td> <td class="function_name"><a class="link" href="harfbuzz-hb-ot-metrics.html#hb-ot-metrics-tag-t" title="enum hb_ot_metrics_tag_t">hb_ot_metrics_tag_t</a></td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="harfbuzz-hb-ot-metrics.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <hb-ot.h> </pre> </div> <div class="refsect1"> <a name="harfbuzz-hb-ot-metrics.description"></a><h2>Description</h2> <p>Functions for fetching metrics from fonts.</p> </div> <div class="refsect1"> <a name="harfbuzz-hb-ot-metrics.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="hb-ot-metrics-get-position"></a><h3>hb_ot_metrics_get_position ()</h3> <pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a> hb_ot_metrics_get_position (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>, <em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-metrics.html#hb-ot-metrics-tag-t" title="enum hb_ot_metrics_tag_t"><span class="type">hb_ot_metrics_tag_t</span></a> metrics_tag</code></em>, <em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="type">hb_position_t</span></a> *position</code></em>);</pre> <p>It fetches metrics value corresponding to a given tag from a font.</p> <div class="refsect3"> <a name="hb-ot-metrics-get-position.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>font</p></td> <td class="parameter_description"><p>a <a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> object.</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>metrics_tag</p></td> <td class="parameter_description"><p>tag of metrics value you like to fetch.</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>position</p></td> <td class="parameter_description"><p>result of metrics value from the font. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="hb-ot-metrics-get-position.returns"></a><h4>Returns</h4> <p> Whether found the requested metrics in the font.</p> </div> <p class="since">Since: <a class="link" href="api-index-2-6-0.html#api-index-2.6.0">2.6.0</a></p> </div> <hr> <div class="refsect2"> <a name="hb-ot-metrics-get-variation"></a><h3>hb_ot_metrics_get_variation ()</h3> <pre class="programlisting"><span class="returnvalue">float</span> hb_ot_metrics_get_variation (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>, <em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-metrics.html#hb-ot-metrics-tag-t" title="enum hb_ot_metrics_tag_t"><span class="type">hb_ot_metrics_tag_t</span></a> metrics_tag</code></em>);</pre> <p class="since">Since: <a class="link" href="api-index-2-6-0.html#api-index-2.6.0">2.6.0</a></p> </div> <hr> <div class="refsect2"> <a name="hb-ot-metrics-get-x-variation"></a><h3>hb_ot_metrics_get_x_variation ()</h3> <pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="returnvalue">hb_position_t</span></a> hb_ot_metrics_get_x_variation (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>, <em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-metrics.html#hb-ot-metrics-tag-t" title="enum hb_ot_metrics_tag_t"><span class="type">hb_ot_metrics_tag_t</span></a> metrics_tag</code></em>);</pre> <p class="since">Since: <a class="link" href="api-index-2-6-0.html#api-index-2.6.0">2.6.0</a></p> </div> <hr> <div class="refsect2"> <a name="hb-ot-metrics-get-y-variation"></a><h3>hb_ot_metrics_get_y_variation ()</h3> <pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="returnvalue">hb_position_t</span></a> hb_ot_metrics_get_y_variation (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>, <em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-metrics.html#hb-ot-metrics-tag-t" title="enum hb_ot_metrics_tag_t"><span class="type">hb_ot_metrics_tag_t</span></a> metrics_tag</code></em>);</pre> <p class="since">Since: <a class="link" href="api-index-2-6-0.html#api-index-2.6.0">2.6.0</a></p> </div> </div> <div class="refsect1"> <a name="harfbuzz-hb-ot-metrics.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="hb-ot-metrics-tag-t"></a><h3>enum hb_ot_metrics_tag_t</h3> <p>From https://docs.microsoft.com/en-us/typography/opentype/spec/mvar<span class="type">value-tags</span></p> <div class="refsect3"> <a name="hb-ot-metrics-tag-t.members"></a><h4>Members</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="300px" class="enum_members_name"> <col class="enum_members_description"> <col width="200px" class="enum_members_annotations"> </colgroup> <tbody> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-HORIZONTAL-ASCENDER:CAPS"></a>HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER</p></td> <td class="enum_member_description"> <p>horizontal ascender.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-HORIZONTAL-DESCENDER:CAPS"></a>HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER</p></td> <td class="enum_member_description"> <p>horizontal descender.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-HORIZONTAL-LINE-GAP:CAPS"></a>HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP</p></td> <td class="enum_member_description"> <p>horizontal line gap.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-HORIZONTAL-CLIPPING-ASCENT:CAPS"></a>HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT</p></td> <td class="enum_member_description"> <p>horizontal clipping ascent.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-HORIZONTAL-CLIPPING-DESCENT:CAPS"></a>HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT</p></td> <td class="enum_member_description"> <p>horizontal clipping descent.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-VERTICAL-ASCENDER:CAPS"></a>HB_OT_METRICS_TAG_VERTICAL_ASCENDER</p></td> <td class="enum_member_description"> <p>vertical ascender.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-VERTICAL-DESCENDER:CAPS"></a>HB_OT_METRICS_TAG_VERTICAL_DESCENDER</p></td> <td class="enum_member_description"> <p>vertical descender.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-VERTICAL-LINE-GAP:CAPS"></a>HB_OT_METRICS_TAG_VERTICAL_LINE_GAP</p></td> <td class="enum_member_description"> <p>vertical line gap.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-HORIZONTAL-CARET-RISE:CAPS"></a>HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE</p></td> <td class="enum_member_description"> <p>horizontal caret rise.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-HORIZONTAL-CARET-RUN:CAPS"></a>HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN</p></td> <td class="enum_member_description"> <p>horizontal caret run.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-HORIZONTAL-CARET-OFFSET:CAPS"></a>HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET</p></td> <td class="enum_member_description"> <p>horizontal caret offset.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-VERTICAL-CARET-RISE:CAPS"></a>HB_OT_METRICS_TAG_VERTICAL_CARET_RISE</p></td> <td class="enum_member_description"> <p>vertical caret rise.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-VERTICAL-CARET-RUN:CAPS"></a>HB_OT_METRICS_TAG_VERTICAL_CARET_RUN</p></td> <td class="enum_member_description"> <p>vertical caret run.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-VERTICAL-CARET-OFFSET:CAPS"></a>HB_OT_METRICS_TAG_VERTICAL_CARET_OFFSET</p></td> <td class="enum_member_description"> <p>vertical caret offset.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-X-HEIGHT:CAPS"></a>HB_OT_METRICS_TAG_X_HEIGHT</p></td> <td class="enum_member_description"> <p>x height.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-CAP-HEIGHT:CAPS"></a>HB_OT_METRICS_TAG_CAP_HEIGHT</p></td> <td class="enum_member_description"> <p>cap height.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-SUBSCRIPT-EM-X-SIZE:CAPS"></a>HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE</p></td> <td class="enum_member_description"> <p>subscript em x size.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-SUBSCRIPT-EM-Y-SIZE:CAPS"></a>HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE</p></td> <td class="enum_member_description"> <p>subscript em y size.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-SUBSCRIPT-EM-X-OFFSET:CAPS"></a>HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET</p></td> <td class="enum_member_description"> <p>subscript em x offset.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-SUBSCRIPT-EM-Y-OFFSET:CAPS"></a>HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET</p></td> <td class="enum_member_description"> <p>subscript em y offset.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-SUPERSCRIPT-EM-X-SIZE:CAPS"></a>HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE</p></td> <td class="enum_member_description"> <p>superscript em x size.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-SUPERSCRIPT-EM-Y-SIZE:CAPS"></a>HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE</p></td> <td class="enum_member_description"> <p>superscript em y size.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-SUPERSCRIPT-EM-X-OFFSET:CAPS"></a>HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET</p></td> <td class="enum_member_description"> <p>superscript em x offset.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-SUPERSCRIPT-EM-Y-OFFSET:CAPS"></a>HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET</p></td> <td class="enum_member_description"> <p>superscript em y offset.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-STRIKEOUT-SIZE:CAPS"></a>HB_OT_METRICS_TAG_STRIKEOUT_SIZE</p></td> <td class="enum_member_description"> <p>strikeout size.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-STRIKEOUT-OFFSET:CAPS"></a>HB_OT_METRICS_TAG_STRIKEOUT_OFFSET</p></td> <td class="enum_member_description"> <p>strikeout offset.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-UNDERLINE-SIZE:CAPS"></a>HB_OT_METRICS_TAG_UNDERLINE_SIZE</p></td> <td class="enum_member_description"> <p>underline size.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-UNDERLINE-OFFSET:CAPS"></a>HB_OT_METRICS_TAG_UNDERLINE_OFFSET</p></td> <td class="enum_member_description"> <p>underline offset.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="HB-OT-METRICS-TAG-MAX-VALUE:CAPS"></a>_HB_OT_METRICS_TAG_MAX_VALUE</p></td> <td> </td> <td> </td> </tr> </tbody> </table></div> </div> <p class="since">Since: <a class="link" href="api-index-2-6-0.html#api-index-2.6.0">2.6.0</a></p> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>