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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=US-ASCII"><title>Coverage Maps</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1"><link rel="start" href="index.html" title="Pango Reference Manual"><link rel="up" href="lowlevel.html" title="Low Level Functionality"><link rel="prev" href="pango-OpenType-Font-Handling.html" title="OpenType Font Handling"><link rel="next" href="pango-Engines.html" title="Engines"><meta name="generator" content="GTK-Doc V1.6 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"><link rel="chapter" href="pango.html" title="Basic Pango Interfaces"><link rel="chapter" href="rendering.html" title="Rendering with Pango"><link rel="chapter" href="lowlevel.html" title="Low Level Functionality"><link rel="chapter" href="tools.html" title="Pango Tools"><link rel="index" href="ix01.html" title="Index"><link rel="index" href="ix02.html" title="Index of deprecated symbols"><link rel="index" href="ix03.html" title="Index of new symbols in 1.2"><link rel="index" href="ix04.html" title="Index of new symbols in 1.4"><link rel="index" href="ix05.html" title="Index of new symbols in 1.6"><link rel="index" href="ix06.html" title="Index of new symbols in 1.8"><link rel="index" href="ix07.html" title="Index of new symbols in 1.10"><link rel="index" href="ix08.html" title="Index of new symbols in 1.12"><link rel="index" href="ix09.html" title="Index of new symbols in 1.14"><link rel="index" href="ix10.html" title="Index of new symbols in 1.16"></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="2"><tr valign="middle"><td><a accesskey="p" href="pango-OpenType-Font-Handling.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="lowlevel.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">Pango Reference Manual</th><td><a accesskey="n" href="pango-Engines.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr><tr><td colspan="5" class="shortcuts"><nobr><a href="#top_of_page" class="shortcut">Top</a>  |  <a href="#desc" class="shortcut">Description</a></nobr></td></tr></table><div class="refentry" lang="en"><a name="pango-Coverage-Maps"></a><div class="titlepage"></div><div class="refnamediv"><table width="100%"><tr><td valign="top"><h2><span class="refentrytitle"><a name="top_of_page"></a>Coverage Maps</span></h2><p>Coverage Maps — Unicode character range coverage storage</p></td><td valign="top" align="right"></td></tr></table></div><div class="refsynopsisdiv"><a name="synopsis"></a><h2>Synopsis</h2><pre class="synopsis">enum <a href="pango-Coverage-Maps.html#PangoCoverageLevel">PangoCoverageLevel</a>;#define <a href="pango-Coverage-Maps.html#PANGO-TYPE-COVERAGE-LEVEL:CAPS">PANGO_TYPE_COVERAGE_LEVEL</a> <a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a>;<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a>* <a href="pango-Coverage-Maps.html#pango-coverage-new">pango_coverage_new</a> (void);<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a>* <a href="pango-Coverage-Maps.html#pango-coverage-ref">pango_coverage_ref</a> (<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a> *coverage);void <a href="pango-Coverage-Maps.html#pango-coverage-unref">pango_coverage_unref</a> (<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a> *coverage);<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a>* <a href="pango-Coverage-Maps.html#pango-coverage-copy">pango_coverage_copy</a> (<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a> *coverage);<a href="pango-Coverage-Maps.html#PangoCoverageLevel">PangoCoverageLevel</a> <a href="pango-Coverage-Maps.html#pango-coverage-get">pango_coverage_get</a> (<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a> *coverage, int index_);void <a href="pango-Coverage-Maps.html#pango-coverage-max">pango_coverage_max</a> (<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a> *coverage, <a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a> *other);void <a href="pango-Coverage-Maps.html#pango-coverage-set">pango_coverage_set</a> (<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a> *coverage, int index_, <a href="pango-Coverage-Maps.html#PangoCoverageLevel">PangoCoverageLevel</a> level);void <a href="pango-Coverage-Maps.html#pango-coverage-to-bytes">pango_coverage_to_bytes</a> (<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a> *coverage, <ahref="../glib/glib-Basic-Types.html#guchar">guchar</a> **bytes, int *n_bytes);<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a>* <a href="pango-Coverage-Maps.html#pango-coverage-from-bytes">pango_coverage_from_bytes</a> (<ahref="../glib/glib-Basic-Types.html#guchar">guchar</a> *bytes, int n_bytes);</pre></div><div class="refsect1" lang="en"><a name="desc"></a><h2>Description</h2><p>It is often necessary in Pango to determine if a particular font canrepresent a particular character, and also how well it can representthat character. The <a href="pango-Coverage-Maps.html#PangoCoverage"><span class="type">PangoCoverage</span></a> is a data structure that is usedto represent that information.</p></div><div class="refsect1" lang="en"><a name="details"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id2933010"></a><h3><a name="PangoCoverageLevel"></a>enum PangoCoverageLevel</h3><a class="indexterm" name="id2933022"></a><pre class="programlisting">typedef enum { PANGO_COVERAGE_NONE, PANGO_COVERAGE_FALLBACK, PANGO_COVERAGE_APPROXIMATE, PANGO_COVERAGE_EXACT} PangoCoverageLevel;</pre><p>Used to indicate how well a font can represent a particular Unicodecharacter point for a particular script.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><a name="PANGO-COVERAGE-NONE:CAPS"></a><code class="literal">PANGO_COVERAGE_NONE</code></span></td><td>The character is not representable with the font.</td></tr><tr><td><span class="term"><a name="PANGO-COVERAGE-FALLBACK:CAPS"></a><code class="literal">PANGO_COVERAGE_FALLBACK</code></span></td><td>The character is represented in a way that may be comprehensible but is not the correct graphical form. For instance, a Hangul character represented as a a sequence of Jamos, or a Latin transliteration of a Cyrillic word.</td></tr><tr><td><span class="term"><a name="PANGO-COVERAGE-APPROXIMATE:CAPS"></a><code class="literal">PANGO_COVERAGE_APPROXIMATE</code></span></td><td>The character is represented as basically the correct graphical form, but with a stylistic variant inappropriate for the current script.</td></tr><tr><td><span class="term"><a name="PANGO-COVERAGE-EXACT:CAPS"></a><code class="literal">PANGO_COVERAGE_EXACT</code></span></td><td>The character is represented as the correct graphical form.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2933146"></a><h3><a name="PANGO-TYPE-COVERAGE-LEVEL:CAPS"></a>PANGO_TYPE_COVERAGE_LEVEL</h3><a class="indexterm" name="id2933160"></a><pre class="programlisting">#define PANGO_TYPE_COVERAGE_LEVEL (pango_coverage_level_get_type())</pre><p>The <ahref="../gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> type for <a href="pango-Coverage-Maps.html#PangoCoverageLevel"><span class="type">PangoCoverageLevel</span></a>.</p></div><hr><div class="refsect2" lang="en"><a name="id2933193"></a><h3><a name="PangoCoverage"></a>PangoCoverage</h3><a class="indexterm" name="id2933206"></a><pre class="programlisting">typedef struct _PangoCoverage PangoCoverage;</pre><p>The <a href="pango-Coverage-Maps.html#PangoCoverage"><span class="type">PangoCoverage</span></a> structure represents a map from Unicode charactersto <a href="pango-Coverage-Maps.html#PangoCoverageLevel"><span class="type">PangoCoverageLevel</span></a>. It is an opaque structure with no public fields.</p></div><hr><div class="refsect2" lang="en"><a name="id2933240"></a><h3><a name="pango-coverage-new"></a>pango_coverage_new ()</h3><a class="indexterm" name="id2933253"></a><pre class="programlisting"><a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a>* pango_coverage_new (void);</pre><p>Create a new <a href="pango-Coverage-Maps.html#PangoCoverage"><span class="type">PangoCoverage</span></a></p><p></p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> the newly allocated <a href="pango-Coverage-Maps.html#PangoCoverage"><span class="type">PangoCoverage</span></a>, initialized to <a href="pango-Coverage-Maps.html#PANGO-COVERAGE-NONE:CAPS"><code class="literal">PANGO_COVERAGE_NONE</code></a> with a reference count of one, which should be freed with <a href="pango-Coverage-Maps.html#pango-coverage-unref"><code class="function">pango_coverage_unref()</code></a>.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2933332"></a><h3><a name="pango-coverage-ref"></a>pango_coverage_ref ()</h3><a class="indexterm" name="id2933346"></a><pre class="programlisting"><a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a>* pango_coverage_ref (<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a> *coverage);</pre><p>Increase the reference count on the <a href="pango-Coverage-Maps.html#PangoCoverage"><span class="type">PangoCoverage</span></a> by one</p><p></p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><em class="parameter"><code>coverage</code></em> :</span></td><td> a <a href="pango-Coverage-Maps.html#PangoCoverage"><span class="type">PangoCoverage</span></a></td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td> <em class="parameter"><code>coverage</code></em></td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id2933428"></a><h3><a name="pango-coverage-unref"></a>pango_coverage_unref ()</h3><a class="indexterm" name="id2933442"></a><pre class="programlisting">void pango_coverage_unref (<a href="pango-Coverage-Maps.html#PangoCoverage">PangoCoverage</a> *coverage);</pre><p>Increase the reference count on the <a href="pango-Coverage-Maps.html#PangoCoverage"><span class="type">PangoCoverage</span></a> by one.if the result is zero, free the coverage and all associated memory.</p><p></p><div class="variablelist"><table border="0">?? 快捷鍵說明
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