Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/docs/usermanual-utilities.xml @ 31:baeb8bdeff3a

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 13:11:30 +0200
parents b50eed0cc0ef
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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="utilities">
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8 <title>Utilities</title>
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9 <para>
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10 HarfBuzz includes several auxiliary components in addition to the
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11 main APIs. These include a set of command-line tools, a set of
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12 lower-level APIs for common data types that may be of interest to
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13 client programs.
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14 </para>
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15
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16 <section id="utilities-command-line-tools">
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17 <title>Command-line tools</title>
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18 <para>
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19 HarfBuzz include three command-line tools:
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20 <command>hb-shape</command>, <command>hb-view</command>, and
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21 <command>hb-subset</command>. They can be used to examine
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22 HarfBuzz's functionality, debug font binaries, or explore the
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23 various shaping models and features from a terminal.
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24 </para>
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25
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26 <section id="utilities-command-line-hbshape">
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27 <title>hb-shape</title>
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28 <para>
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29 <emphasis><command>hb-shape</command></emphasis> allows you to run HarfBuzz's
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30 <function>hb_shape()</function> function on an input string and
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31 to examine the outcome, in human-readable form, as terminal
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32 output. <command>hb-shape</command> does
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33 <emphasis>not</emphasis> render the results of the shaping call
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34 into rendered text (you can use <command>hb-view</command>, below, for
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35 that). Instead, it prints out the final glyph indices and
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36 positions, taking all shaping operations into account, as if the
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37 input string were a HarfBuzz input buffer.
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38 </para>
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39 <para>
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40 You can specify the font to be used for shaping and, with
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41 command-line options, you can add various aspects of the
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42 internal state to the output that is sent to the terminal. The
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43 general format is
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44 </para>
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45 <programlisting>
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46 <command>hb-shape</command> <optional>[OPTIONS]</optional>
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47 <parameter>path/to/font/file.ttf</parameter>
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48 <parameter>yourinputtext</parameter>
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49 </programlisting>
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50 <para>
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51 The default output format is plain text (although JSON output
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52 can be selected instead by specifying the option
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53 <optional>--output-format=json</optional>). The default output
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54 syntax reports each glyph name (or glyph index if there is no
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55 name) followed by its cluster value, its horizontal and vertical
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56 position displacement, and its horizontal and vertical advances.
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57 </para>
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58 <para>
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59 Output options exist to skip any of these elements in the
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60 output, and to include additional data, such as Unicode
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61 code-point values, glyph extents, glyph flags, or interim
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62 shaping results.
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63 </para>
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64 <para>
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65 Output can also be redirected to a file, or input read from a
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66 file. Additional options enable you to enable or disable
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67 specific font features, to set variation-font axis values, to
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68 alter the language, script, direction, and clustering settings
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69 used, to enable sanity checks, or to change which shaping engine is used.
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70 </para>
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71 <para>
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72 For a complete explanation of the options available, run
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73 </para>
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74 <programlisting>
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75 <command>hb-shape</command> <parameter>--help</parameter>
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76 </programlisting>
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77 </section>
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78
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79 <section id="utilities-command-line-hbview">
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80 <title>hb-view</title>
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81 <para>
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82 <emphasis><command>hb-view</command></emphasis> allows you to
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83 see the shaped output of an input string in rendered
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84 form. Like <command>hb-shape</command>,
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85 <command>hb-view</command> takes a font file and a text string
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86 as its arguments:
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87 </para>
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88 <programlisting>
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89 <command>hb-view</command> <optional>[OPTIONS]</optional>
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90 <parameter>path/to/font/file.ttf</parameter>
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91 <parameter>yourinputtext</parameter>
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92 </programlisting>
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93 <para>
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94 By default, <command>hb-view</command> renders the shaped
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95 text in ASCII block-character images as terminal output. By
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96 appending the
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97 <command>--output-file=<optional>filename</optional></command>
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98 switch, you can write the output to a PNG, SVG, or PDF file
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99 (among other formats).
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100 </para>
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101 <para>
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102 As with <command>hb-shape</command>, a lengthy set of options
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103 is available, with which you can enable or disable
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104 specific font features, set variation-font axis values,
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105 alter the language, script, direction, and clustering settings
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106 used, enable sanity checks, or change which shaping engine is
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107 used.
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108 </para>
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109 <para>
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110 You can also set the foreground and background colors used for
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111 the output, independently control the width of all four
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112 margins, alter the line spacing, and annotate the output image
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113 with
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114 </para>
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115 <para>
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116 In general, <command>hb-view</command> is a quick way to
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117 verify that the output of HarfBuzz's shaping operation looks
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118 correct for a given text-and-font combination, but you may
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119 want to use <command>hb-shape</command> to figure out exactly
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120 why something does not appear as expected.
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121 </para>
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122 </section>
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123
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124 <section id="utilities-command-line-hbsubset">
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125 <title>hb-subset</title>
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126 <para>
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127 <emphasis><command>hb-subset</command></emphasis> allows you
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128 to generate a subset of a given font, with a limited set of
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129 supported characters, features, and variation settings.
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130 </para>
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131 <para>
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132 By default, you provide an input font and an input text string
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133 as the arguments to <command>hb-subset</command>, and it will
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134 generate a font that covers the input text exactly like the
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135 input font does, but includes no other characters or features.
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136 </para>
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137 <programlisting>
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138 <command>hb-subset</command> <optional>[OPTIONS]</optional>
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139 <parameter>path/to/font/file.ttf</parameter>
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140 <parameter>yourinputtext</parameter>
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141 </programlisting>
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142 <para>
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143 For example, to create a subset of Noto Serif that just includes the
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144 numerals and the lowercase Latin alphabet, you could run
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145 </para>
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146 <programlisting>
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147 <command>hb-subset</command> <optional>[OPTIONS]</optional>
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148 <parameter>NotoSerif-Regular.ttf</parameter>
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149 <parameter>0123456789abcdefghijklmnopqrstuvwxyz</parameter>
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150 </programlisting>
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151 <para>
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152 There are options available to remove hinting from the
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153 subsetted font and to specify a list of variation-axis settings.
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154 </para>
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155 </section>
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156
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157 </section>
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158
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159 <section id="utilities-common-types-apis">
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160 <title>Common data types and APIs</title>
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161 <para>
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162 HarfBuzz includes several APIs for working with general-purpose
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163 data that you may find convenient to leverage in your own
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164 software. They include set operations and integer-to-integer
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165 mapping operations.
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166 </para>
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167 <para>
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168 HarfBuzz uses set operations for internal bookkeeping, such as
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169 when it collects all of the glyph IDs covered by a particular
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170 font feature. You can also use the set API to build sets, add
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171 and remove elements, test whether or not sets contain particular
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172 elements, or compute the unions, intersections, or differences
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173 between sets.
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174 </para>
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175 <para>
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176 All set elements are integers (specifically,
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177 <type>hb_codepoint_t</type> 32-bit unsigned ints), and there are
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178 functions for fetching the minimum and maximum element from a
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179 set. The set API also includes some functions that might not
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180 be part of a generic set facility, such as the ability to add a
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181 contiguous range of integer elements to a set in bulk, and the
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182 ability to fetch the next-smallest or next-largest element.
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183 </para>
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184 <para>
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185 The HarfBuzz set API includes some conveniences as well. All
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186 sets are lifecycle-managed, just like other HarfBuzz
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187 objects. You increase the reference count on a set with
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188 <function>hb_set_reference()</function> and decrease it with
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189 <function>hb_set_destroy()</function>. You can also attach
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190 user data to a set, just like you can to blobs, buffers, faces,
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191 fonts, and other objects, and set destroy callbacks.
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192 </para>
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193 <para>
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194 HarfBuzz also provides an API for keeping track of
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195 integer-to-integer mappings. As with the set API, each integer is
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196 stored as an unsigned 32-bit <type>hb_codepoint_t</type>
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197 element. Maps, like other objects, are reference counted with
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198 reference and destroy functions, and you can attach user data to
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199 them. The mapping operations include adding and deleting
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200 integer-to-integer key:value pairs to the map, testing for the
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201 presence of a key, fetching the population of the map, and so on.
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202 </para>
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203 <para>
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204 There are several other internal HarfBuzz facilities that are
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205 exposed publicly and which you may want to take advantage of
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206 while processing text. HarfBuzz uses a common
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207 <type>hb_tag_t</type> for a variety of OpenType tag identifiers (for
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208 scripts, languages, font features, table names, variation-axis
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209 names, and more), and provides functions for converting strings
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210 to tags and vice-versa.
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211 </para>
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212 <para>
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213 Finally, HarfBuzz also includes data type for Booleans, bit
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214 masks, and other simple types.
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215 </para>
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216 </section>
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217
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218 </chapter>