Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/docs/usermanual-getting-started.xml @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 <?xml version="1.0"?>
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2 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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3 "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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4 <!ENTITY % local.common.attrib "xmlns:xi CDATA #FIXED 'http://www.w3.org/2003/XInclude'">
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5 <!ENTITY version SYSTEM "version.xml">
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6 ]>
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7 <chapter id="getting-started">
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8 <title>Getting started with HarfBuzz</title>
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9 <section id="an-overview-of-the-harfbuzz-shaping-api">
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10 <title>An overview of the HarfBuzz shaping API</title>
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11 <para>
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12 The core of the HarfBuzz shaping API is the function
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13 <function>hb_shape()</function>. This function takes a font, a
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14 buffer containing a string of Unicode codepoints and
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15 (optionally) a list of font features as its input. It replaces
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16 the codepoints in the buffer with the corresponding glyphs from
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17 the font, correctly ordered and positioned, and with any of the
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18 optional font features applied.
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19 </para>
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20 <para>
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21 In addition to holding the pre-shaping input (the Unicode
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22 codepoints that comprise the input string) and the post-shaping
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23 output (the glyphs and positions), a HarfBuzz buffer has several
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24 properties that affect shaping. The most important are the
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25 text-flow direction (e.g., left-to-right, right-to-left,
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26 top-to-bottom, or bottom-to-top), the script tag, and the
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27 language tag.
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28 </para>
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29
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30 <para>
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31 For input string buffers, flags are available to denote when the
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32 buffer represents the beginning or end of a paragraph, to
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33 indicate whether or not to visibly render Unicode <literal>Default
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34 Ignorable</literal> codepoints, and to modify the cluster-merging
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35 behavior for the buffer. For shaped output buffers, the
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36 individual X and Y offsets and <literal>advances</literal>
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37 (the logical dimensions) of each glyph are
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38 accessible. HarfBuzz also flags glyphs as
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39 <literal>UNSAFE_TO_BREAK</literal> if breaking the string at
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40 that glyph (e.g., in a line-breaking or hyphenation process)
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41 would require re-shaping the text.
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42 </para>
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43
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44 <para>
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45 HarfBuzz also provides methods to compare the contents of
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46 buffers, join buffers, normalize buffer contents, and handle
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47 invalid codepoints, as well as to determine the state of a
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48 buffer (e.g., input codepoints or output glyphs). Buffer
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49 lifecycles are managed and all buffers are reference-counted.
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50 </para>
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51
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52 <para>
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53 Although the default <function>hb_shape()</function> function is
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54 sufficient for most use cases, a variant is also provided that
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55 lets you specify which of HarfBuzz's shapers to use on a buffer.
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56 </para>
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57
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58 <para>
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59 HarfBuzz can read TrueType fonts, TrueType collections, OpenType
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60 fonts, and OpenType collections. Functions are provided to query
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61 font objects about metrics, Unicode coverage, available tables and
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62 features, and variation selectors. Individual glyphs can also be
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63 queried for metrics, variations, and glyph names. OpenType
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64 variable fonts are supported, and HarfBuzz allows you to set
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65 variation-axis coordinates on font objects.
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66 </para>
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67
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68 <para>
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69 HarfBuzz provides glue code to integrate with various other
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70 libraries, including FreeType, GObject, and CoreText. Support
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71 for integrating with Uniscribe and DirectWrite is experimental
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72 at present.
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73 </para>
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74 </section>
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75
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76 <section id="terminology">
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77 <title>Terminology</title>
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78 <para>
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79
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80 </para>
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81 <variablelist>
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82 <?dbfo list-presentation="blocks"?>
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83 <varlistentry>
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84 <term>script</term>
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85 <listitem>
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86 <para>
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87 In text shaping, a <emphasis>script</emphasis> is a
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88 writing system: a set of symbols, rules, and conventions
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89 that is used to represent a language or multiple
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90 languages.
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91 </para>
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92 <para>
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93 In general computing lingo, the word "script" can also
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94 be used to mean an executable program (usually one
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95 written in a human-readable programming language). For
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96 the sake of clarity, HarfBuzz documents will always use
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97 more specific terminology when referring to this
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98 meaning, such as "Python script" or "shell script." In
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99 all other instances, "script" refers to a writing system.
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100 </para>
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101 <para>
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102 For developers using HarfBuzz, it is important to note
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Franz Glasner <fzglas.hg@dom66.de>
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103 the distinction between a script and a language. Most
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104 scripts are used to write a variety of different
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105 languages, and many languages may be written in more
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106 than one script.
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107 </para>
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108 </listitem>
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109 </varlistentry>
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110
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111 <varlistentry>
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112 <term>shaper</term>
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113 <listitem>
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114 <para>
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115 In HarfBuzz, a <emphasis>shaper</emphasis> is a
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Franz Glasner <fzglas.hg@dom66.de>
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116 handler for a specific script-shaping model. HarfBuzz
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117 implements separate shapers for Indic, Arabic, Thai and
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118 Lao, Khmer, Myanmar, Tibetan, Hangul, Hebrew, the
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Franz Glasner <fzglas.hg@dom66.de>
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119 Universal Shaping Engine (USE), and a default shaper for
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Franz Glasner <fzglas.hg@dom66.de>
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120 scripts with no script-specific shaping model.
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121 </para>
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122 </listitem>
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Franz Glasner <fzglas.hg@dom66.de>
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123 </varlistentry>
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Franz Glasner <fzglas.hg@dom66.de>
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124
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125 <varlistentry>
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126 <term>cluster</term>
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127 <listitem>
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Franz Glasner <fzglas.hg@dom66.de>
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128 <para>
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129 In text shaping, a <emphasis>cluster</emphasis> is a
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Franz Glasner <fzglas.hg@dom66.de>
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130 sequence of codepoints that must be treated as an
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Franz Glasner <fzglas.hg@dom66.de>
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131 indivisible unit. Clusters can include code-point
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Franz Glasner <fzglas.hg@dom66.de>
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132 sequences that form a ligature or base-and-mark
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Franz Glasner <fzglas.hg@dom66.de>
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133 sequences. Tracking and preserving clusters is important
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134 when shaping operations might separate or reorder
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Franz Glasner <fzglas.hg@dom66.de>
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135 code points.
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136 </para>
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137 <para>
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Franz Glasner <fzglas.hg@dom66.de>
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138 HarfBuzz provides three cluster
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Franz Glasner <fzglas.hg@dom66.de>
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139 <emphasis>levels</emphasis> that implement different
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Franz Glasner <fzglas.hg@dom66.de>
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140 approaches to the problem of preserving clusters during
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Franz Glasner <fzglas.hg@dom66.de>
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141 shaping operations.
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142 </para>
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Franz Glasner <fzglas.hg@dom66.de>
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143 </listitem>
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Franz Glasner <fzglas.hg@dom66.de>
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144 </varlistentry>
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Franz Glasner <fzglas.hg@dom66.de>
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145
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146 <varlistentry>
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Franz Glasner <fzglas.hg@dom66.de>
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147 <term>grapheme</term>
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148 <listitem>
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Franz Glasner <fzglas.hg@dom66.de>
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149 <para>
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150 In linguistics, a <emphasis>grapheme</emphasis> is one
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Franz Glasner <fzglas.hg@dom66.de>
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151 of the indivisible units that make up a writing system or
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Franz Glasner <fzglas.hg@dom66.de>
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152 script. Often, graphemes are individual symbols (letters,
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Franz Glasner <fzglas.hg@dom66.de>
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153 numbers, punctuation marks, logograms, etc.) but,
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Franz Glasner <fzglas.hg@dom66.de>
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154 depending on the writing system, a particular grapheme
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Franz Glasner <fzglas.hg@dom66.de>
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155 might correspond to a sequence of several Unicode code
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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156 points.
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Franz Glasner <fzglas.hg@dom66.de>
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157 </para>
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Franz Glasner <fzglas.hg@dom66.de>
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158 <para>
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Franz Glasner <fzglas.hg@dom66.de>
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159 In practice, HarfBuzz and other text-shaping engines
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Franz Glasner <fzglas.hg@dom66.de>
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160 are not generally concerned with graphemes. However, it
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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161 is important for developers using HarfBuzz to recognize
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Franz Glasner <fzglas.hg@dom66.de>
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162 that there is a difference between graphemes and shaping
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Franz Glasner <fzglas.hg@dom66.de>
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163 clusters (see above). The two concepts may overlap
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Franz Glasner <fzglas.hg@dom66.de>
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164 frequently, but there is no guarantee that they will be
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Franz Glasner <fzglas.hg@dom66.de>
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165 identical.
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166 </para>
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167 </listitem>
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Franz Glasner <fzglas.hg@dom66.de>
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168 </varlistentry>
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Franz Glasner <fzglas.hg@dom66.de>
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169
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170 <varlistentry>
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Franz Glasner <fzglas.hg@dom66.de>
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171 <term>syllable</term>
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172 <listitem>
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173 <para>
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Franz Glasner <fzglas.hg@dom66.de>
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174 In linguistics, a <emphasis>syllable</emphasis> is an
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Franz Glasner <fzglas.hg@dom66.de>
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175 a sequence of sounds that makes up a building block of a
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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176 particular language. Every language has its own set of
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Franz Glasner <fzglas.hg@dom66.de>
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177 rules describing what constitutes a valid syllable.
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178 </para>
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179 <para>
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Franz Glasner <fzglas.hg@dom66.de>
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180 For text-shaping purposes, the various definitions of
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Franz Glasner <fzglas.hg@dom66.de>
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181 "syllable" are important because script-specific shaping
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Franz Glasner <fzglas.hg@dom66.de>
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182 operations may be applied at the syllable level. For
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Franz Glasner <fzglas.hg@dom66.de>
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183 example, a reordering rule might specify that a vowel
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Franz Glasner <fzglas.hg@dom66.de>
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184 mark be reordered to the beginning of the syllable.
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Franz Glasner <fzglas.hg@dom66.de>
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185 </para>
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186 <para>
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Franz Glasner <fzglas.hg@dom66.de>
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187 Syllables will consist of one or more Unicode code
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Franz Glasner <fzglas.hg@dom66.de>
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188 points. The definition of a syllable for a particular
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Franz Glasner <fzglas.hg@dom66.de>
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189 writing system might correspond to how HarfBuzz
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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190 identifies clusters (see above) for the same writing
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Franz Glasner <fzglas.hg@dom66.de>
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191 system. However, it is important for developers using
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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192 HarfBuzz to recognize that there is a difference between
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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193 syllables and shaping clusters. The two concepts may
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Franz Glasner <fzglas.hg@dom66.de>
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194 overlap frequently, but there is no guarantee that they
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Franz Glasner <fzglas.hg@dom66.de>
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195 will be identical.
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Franz Glasner <fzglas.hg@dom66.de>
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196 </para>
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Franz Glasner <fzglas.hg@dom66.de>
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197 </listitem>
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Franz Glasner <fzglas.hg@dom66.de>
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198 </varlistentry>
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Franz Glasner <fzglas.hg@dom66.de>
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199 </variablelist>
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Franz Glasner <fzglas.hg@dom66.de>
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200
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
201 </section>
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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202
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
203
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
204 <section id="a-simple-shaping-example">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
205 <title>A simple shaping example</title>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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206
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
207 <para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
208 Below is the simplest HarfBuzz shaping example possible.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
209 </para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
210 <orderedlist numeration="arabic">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
211 <listitem>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
212 <para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
213 Create a buffer and put your text in it.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
214 </para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
215 </listitem>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
216 </orderedlist>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
217 <programlisting language="C">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
218 #include &lt;hb.h&gt;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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219
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
220 hb_buffer_t *buf;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
221 buf = hb_buffer_create();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
222 hb_buffer_add_utf8(buf, text, -1, 0, -1);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
223 </programlisting>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
224 <orderedlist numeration="arabic">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
225 <listitem override="2">
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
226 <para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
227 Set the script, language and direction of the buffer.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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228 </para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
229 </listitem>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
230 </orderedlist>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
231 <programlisting language="C">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
232 hb_buffer_set_direction(buf, HB_DIRECTION_LTR);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
233 hb_buffer_set_script(buf, HB_SCRIPT_LATIN);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
234 hb_buffer_set_language(buf, hb_language_from_string("en", -1));
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
235 </programlisting>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
236 <orderedlist numeration="arabic">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
237 <listitem override="3">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
238 <para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
239 Create a face and a font from a font file.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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240 </para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
241 </listitem>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
242 </orderedlist>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
243 <programlisting language="C">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
244 hb_blob_t *blob = hb_blob_create_from_file(filename); /* or hb_blob_create_from_file_or_fail() */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
245 hb_face_t *face = hb_face_create(blob, 0);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
246 hb_font_t *font = hb_font_create(face);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
247 </programlisting>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
248 <orderedlist numeration="arabic">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
249 <listitem override="4">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
250 <para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
251 Shape!
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
252 </para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
253 </listitem>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
254 </orderedlist>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
255 <programlisting>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
256 hb_shape(font, buf, NULL, 0);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
257 </programlisting>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
258 <orderedlist numeration="arabic">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
259 <listitem override="5">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
260 <para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
261 Get the glyph and position information.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
262 </para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
263 </listitem>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
264 </orderedlist>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
265 <programlisting language="C">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
266 unsigned int glyph_count;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
267 hb_glyph_info_t *glyph_info = hb_buffer_get_glyph_infos(buf, &amp;glyph_count);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
268 hb_glyph_position_t *glyph_pos = hb_buffer_get_glyph_positions(buf, &amp;glyph_count);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
269 </programlisting>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
270 <orderedlist numeration="arabic">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
271 <listitem override="6">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
272 <para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
273 Iterate over each glyph.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
274 </para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
275 </listitem>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
276 </orderedlist>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
277 <programlisting language="C">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
278 hb_position_t cursor_x = 0;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
279 hb_position_t cursor_y = 0;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
280 for (unsigned int i = 0; i &lt; glyph_count; i++) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
281 hb_codepoint_t glyphid = glyph_info[i].codepoint;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
282 hb_position_t x_offset = glyph_pos[i].x_offset;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
283 hb_position_t y_offset = glyph_pos[i].y_offset;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
284 hb_position_t x_advance = glyph_pos[i].x_advance;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
285 hb_position_t y_advance = glyph_pos[i].y_advance;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
286 /* draw_glyph(glyphid, cursor_x + x_offset, cursor_y + y_offset); */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
287 cursor_x += x_advance;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
288 cursor_y += y_advance;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
289 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
290 </programlisting>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
291 <orderedlist numeration="arabic">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
292 <listitem override="7">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
293 <para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
294 Tidy up.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
295 </para>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
296 </listitem>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
297 </orderedlist>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
298 <programlisting language="C">
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
299 hb_buffer_destroy(buf);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
300 hb_font_destroy(font);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
301 hb_face_destroy(face);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
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302 hb_blob_destroy(blob);
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303 </programlisting>
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304
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305 <para>
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306 This example shows enough to get us started using HarfBuzz. In
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307 the sections that follow, we will use the remainder of
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308 HarfBuzz's API to refine and extend the example and improve its
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309 text-shaping capabilities.
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310 </para>
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311 </section>
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312 </chapter>