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annotate mupdf-source/thirdparty/harfbuzz/CONFIG.md @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
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1 # Configuring HarfBuzz
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3 Most of the time you will not need any custom configuration. The configuration
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4 options provided by `meson` should be enough. In particular, if you just want
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5 HarfBuzz library plus hb-shape / hb-view utilities, make sure FreeType and Cairo
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6 are available and found during configuration.
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8 If you are building for distribution, you should more carefully consider whether
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9 you need Glib, ICU, Graphite2, as well as CoreText / Uniscribe / DWrite. Make
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10 sure the relevant ones are enabled.
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12 If you are building for custom environment (embedded, downloadable app, etc)
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13 where you mostly just want to call `hb_shape()` and the binary size of the
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14 resulting library is very important to you, the rest of this file guides you
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15 through your options to disable features you may not need, in exchange for
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16 binary size savings.
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18 ## Compiler Options
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20 Make sure you build with your compiler's "optimize for size" option. On `gcc`
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21 this is `-Os`, and can be enabled by passing `CXXFLAGS=-Os`. On clang there
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22 is an even more extreme flag, `-Oz`. Meson also provides `--buildtype=minsize`
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23 for more convenience.
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25 HarfBuzz heavily uses inline functions and the optimize-size flag can make the
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26 library smaller by 20% or more. Moreover, sometimes, based on the target CPU,
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27 the optimize-size builds perform *faster* as well, thanks to lower code
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28 footprint and caching effects. So, definitely try that even if size is not
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29 extremely tight but you have a huge application. For example, Chrome does
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30 that. Note that this configuration also automatically enables certain internal
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31 optimizations. Search for `HB_OPTIMIZE_SIZE` for details, if you are using
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32 other compilers, or continue reading.
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34 Another compiler option to consider is "link-time optimization", also known as
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35 'lto'. To enable that, feel free to use `-Db_lto=true` of meson.
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36 This, also, can have a huge impact on the final size, 20% or more.
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38 Finally, if you are making a static library build or otherwise linking the
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39 library into your app, make sure your linker removes unused functions. This
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40 can be tricky and differ from environment to environment, but you definitely
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41 want to make sure this happens. Otherwise, every unused public function will
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42 be adding unneeded bytes to your binary. The following pointers might come
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43 handy:
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45 * https://lwn.net/Articles/741494/ (all of the four-part series)
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46 * https://elinux.org/images/2/2d/ELC2010-gc-sections_Denys_Vlasenko.pdf
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48 Combining the above three build options should already shrink your library a lot.
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49 The rest of this file shows you ways to shrink the library even further at the
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50 expense of removing functionality (that may not be needed). The remaining
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51 options are all enabled by defining pre-processor macros, which can be done
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52 via `CXXFLAGS` or `CPPFLAGS` similarly.
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55 ## Unicode-functions
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57 Access to Unicode data can be configured at compile time as well as run-time.
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58 By default, HarfBuzz ships with its own compact subset of properties from
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59 Unicode Character Database that it needs. This is a highly-optimized
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60 implementation that depending on compile settings (optimize-size or not)
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61 takes around ~40kb or ~60kb. Using this implementation (default) is highly
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62 recommended, as HarfBuzz always ships with data from latest version of Unicode.
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63 This implementation can be disabled by defining `HB_NO_UCD`.
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65 For example, if you are enabling ICU as a built-in option, or GLib, those
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66 can provide Unicode data as well, so defining `HB_NO_UCD` might save you
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67 space without reducing functionality (to the extent that the Unicode version
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68 of those implementations is recent.)
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70 If, however, you provide your own Unicode data to HarfBuzz at run-time by
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71 calling `hb_buffer_set_unicode_funcs` on every buffer you create, and you do
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72 not rely on `hb_unicode_funcs_get_default()` results, you can disable the
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73 internal implementation by defining both `HB_NO_UCD` and `HB_NO_UNICODE_FUNCS`.
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74 The latter is needed to guard against accidentally building a library without
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75 any default Unicode implementations.
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78 ## Font-functions
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80 Access to certain font functionalities can also be configured at run-time. By
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81 default, HarfBuzz uses an efficient internal implementation of OpenType
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82 functionality for this. This internal implementation is called `hb-ot-font`.
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83 All newly-created `hb_font_t` objects by default use `hb-ot-font`. Using this
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84 is highly recommended, and is what fonts use by default when they are created.
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86 Most embedded uses will probably use HarfBuzz with FreeType using `hb-ft.h`.
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87 In that case, or if you otherwise provide those functions by calling
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88 `hb_font_set_funcs()` on every font you create, you can disable `hb-ot-font`
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89 without loss of functionality by defining `HB_NO_OT_FONT`.
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90
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92 ## Shapers
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94 Most HarfBuzz clients use it for the main shaper, called "ot". However, it
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95 is legitimate to want to compile HarfBuzz with only another backend, eg.
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96 CoreText, for example for an iOS app. For that, you want `HB_NO_OT_SHAPE`.
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97 If you are going down that route, check if you want `HB_NO_OT`.
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98
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99 This is very rarely what you need. Make sure you understand exactly what you
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100 are doing.
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101
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102 Defining `HB_NO_FALLBACK_SHAPE` however is pretty harmless. That removes the
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103 (unused) "fallback" shaper. This is defined by the `HB_TINY` profile already
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104 (more below).
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105
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106
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107 ## Thread-safety
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108
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109 By default HarfBuzz builds as a thread-safe library. The exception is that
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110 the `HB_TINY` predefined configuration (more below) disables thread-safety.
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111
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112 If you do *not* need thread-safety in the library (eg. you always call into
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113 HarfBuzz from the same thread), you can disable thread-safety by defining
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114 `HB_NO_MT`. As noted already, this is enabled by `HB_TINY`.
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115
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116
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117 ## Pre-defined configurations
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118
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119 The [`hb-config.hh`](src/hb-config.hh) internal header supports three
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120 pre-defined configurations as well grouping of various configuration options.
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121 The pre-defined configurations are:
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122
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123 * `HB_MINI`: Disables shaping of AAT as well as legacy fonts. Ie. it produces
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124 a capable OpenType shaper only.
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125
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126 * `HB_LEAN`: Disables various non-shaping functionality in the library, as well
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127 as esoteric or rarely-used shaping features. See the definition for details.
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128
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129 * `HB_TINY`: Enables both `HB_MINI` and `HB_LEAN` configurations, as well as
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130 disabling thread-safety and debugging, and use even more size-optimized data
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131 tables.
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132
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133
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134 ## Tailoring configuration
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135
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136 Most of the time, one of the pre-defined configuration is exactly what one needs.
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137 Sometimes, however, the pre-defined configuration cuts out features that might
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138 be desired in the library. Unfortunately there is no quick way to undo those
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139 configurations from the command-line.
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140
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141 However, configuration can still be overridden from a file. To do that, add your
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142 override instructions (mostly `undef` instructions) to a header file and define
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143 the macro `HB_CONFIG_OVERRIDE_H` to the string containing to that header file's
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144 name. HarfBuzz will then include that file at the appropriate place during
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145 configuration.
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146
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147 Up until HarfBuzz 3.1.2 the the configuration override header file's name was
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148 fixed and called `config-override.h`, and was activated by defining the macro
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149 `HAVE_CONFIG_OVERRIDE_H`. That still works.
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150
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151
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152 ## Notes
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153
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154 Note that the config option `HB_NO_CFF`, which is enabled by `HB_LEAN` and
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155 `HB_TINY` does *not* mean that the resulting library won't work with CFF fonts.
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156 The library can shape valid CFF fonts just fine, with or without this option.
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157 This option disables (among other things) the code to calculate glyph extents
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158 for CFF fonts, which many clients might not need.