Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/source/fitz/harfbuzz.c @ 29:f76e6575dca9 v1.26.4+1

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+++++ v1.26.4+1
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 19:59:23 +0200
parents b50eed0cc0ef
children
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1 // Copyright (C) 2004-2021 Artifex Software, Inc.
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2 //
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3 // This file is part of MuPDF.
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4 //
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5 // MuPDF is free software: you can redistribute it and/or modify it under the
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6 // terms of the GNU Affero General Public License as published by the Free
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7 // Software Foundation, either version 3 of the License, or (at your option)
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8 // any later version.
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9 //
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10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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13 // details.
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14 //
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15 // You should have received a copy of the GNU Affero General Public License
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16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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17 //
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18 // Alternative licensing terms are available from the licensor.
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19 // For commercial licensing, see <https://www.artifex.com/> or contact
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20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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21 // CA 94129, USA, for further information.
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22
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23 /*
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24 * Some additional glue functions for using Harfbuzz with
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25 * custom allocators.
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26 */
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27
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28 #include "mupdf/fitz.h"
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29
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30 #if FZ_ENABLE_HTML_ENGINE
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31
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32 #include "hb.h"
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33
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34 #include <assert.h>
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35
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36 /* Harfbuzz has some major design flaws (for our usage
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37 * at least).
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38 *
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39 * By default it uses malloc and free as the underlying
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40 * allocators. Thus in its default form we cannot get
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41 * a record (much less control) over how much allocation
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42 * is done.
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43 *
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44 * Harfbuzz does allow build options to control where
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45 * malloc and free go - in particular we point them at
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46 * fz_hb_malloc and fz_hb_free in our implementation.
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47 * Unfortunately, this has problems too.
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48 *
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49 * Firstly, there is no mechanism for getting a context
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50 * through the call. Most other libraries allow us to
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51 * pass a "void *" value in, and have it passed through
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52 * to arrive unchanged at the allocator functions.
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53 *
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54 * Without this rudimentary functionality, we are forced
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55 * to serialise all access to Harfbuzz.
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56 *
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57 * By taking a mutex around all calls to Harfbuzz, we
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58 * can use a static of our own to get a fz_context safely
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59 * through to the allocators. This obviously costs us
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60 * performance in the multi-threaded case.
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61 *
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62 * This does not protect us against the possibility of
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63 * other people calling harfbuzz; for instance, if we
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64 * link MuPDF into an app that either calls harfbuzz
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65 * itself, or uses another library that calls harfbuzz,
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66 * there is no guarantee that that library will take
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67 * the same lock while calling harfbuzz. This leaves
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68 * us open to the possibility of crashes. The only
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69 * way around this would be to use completely separate
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70 * harfbuzz instances.
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71 *
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72 * In order to ensure that allocations throughout mupdf
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73 * are done consistently, we get harfbuzz to call our
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74 * own fz_hb_malloc/realloc/calloc/free functions that
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75 * call down to fz_malloc/realloc/calloc/free. These
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76 * require context variables, so we get our fz_hb_lock
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77 * and unlock to set these. Any attempt to call through
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78 * without setting these will be detected.
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79 *
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80 * It is therefore vital that any fz_lock/fz_unlock
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81 * handlers are shared between all the fz_contexts in
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82 * use at a time.
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83 *
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84 * Secondly, Harfbuzz allocates some 'internal' memory
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85 * on the first call, and leaves this linked from static
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86 * variables. By default, this data is never freed back.
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87 * This means it is impossible to clear the library back
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88 * to a default state. Memory debugging will always show
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89 * Harfbuzz as having leaked a set amount of memory.
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90 *
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91 * There is a mechanism in Harfbuzz for freeing these
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92 * blocks - that of building with HAVE_ATEXIT. This
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93 * causes the blocks to be freed back on exit, but a)
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94 * this doesn't reset the fz_context value, so we can't
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95 * free them correctly, and b) any fz_context value it
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96 * did keep would already have been closed down due to
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97 * the program exit.
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98 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
99 * In addition, because of these everlasting blocks, we
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
100 * cannot safely call Harfbuzz after we close down any
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
101 * allocator that Harfbuzz has been using (because
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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102 * Harfbuzz may still be holding pointers to data within
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 * that allocators managed space).
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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105 * There is nothing we can do about the leaking blocks
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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106 * except to add some hacks to our memory debugging
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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107 * library to allow it to suppress the blocks that
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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108 * harfbuzz leaks.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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109 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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110 * Consequently, we leave them to leak, and warn Memento
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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111 * about this.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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112 */
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113
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parents:
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114 /* Potentially we can write different versions
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115 * of get_context and set_context for different
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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116 * threading systems.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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117 *
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Franz Glasner <fzglas.hg@dom66.de>
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118 * This simple version relies on harfbuzz never
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parents:
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119 * trying to make 2 allocations at once on
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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120 * different threads. The only way that can happen
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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121 * is when one of those other threads is someone
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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122 * outside MuPDF calling harfbuzz while MuPDF
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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123 * is running. This will cause us such huge
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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124 * problems that for now, we'll just forbid it.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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125 */
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126
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127 static fz_context *fz_hb_secret = NULL;
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128
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129 static void set_hb_context(fz_context *ctx)
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130 {
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131 fz_hb_secret = ctx;
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132 }
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133
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134 static fz_context *get_hb_context(void)
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135 {
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136 return fz_hb_secret;
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137 }
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138
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parents:
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139 void fz_hb_lock(fz_context *ctx)
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parents:
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140 {
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parents:
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141 fz_ft_lock(ctx);
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142
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parents:
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143 set_hb_context(ctx);
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144 }
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145
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146 void fz_hb_unlock(fz_context *ctx)
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147 {
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148 set_hb_context(NULL);
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149
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150 fz_ft_unlock(ctx);
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parents:
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151 }
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152
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153 void *fz_hb_malloc(size_t size)
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parents:
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154 {
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parents:
diff changeset
155 fz_context *ctx = get_hb_context();
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parents:
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156
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parents:
diff changeset
157 assert(ctx != NULL);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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158
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parents:
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159 return Memento_label(fz_malloc_no_throw(ctx, size), "hb");
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parents:
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160 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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161
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 void *fz_hb_calloc(size_t n, size_t size)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
163 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
164 fz_context *ctx = get_hb_context();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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165
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parents:
diff changeset
166 assert(ctx != NULL);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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167
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 return Memento_label(fz_calloc_no_throw(ctx, n, size), "hb");
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parents:
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169 }
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parents:
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170
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parents:
diff changeset
171 void *fz_hb_realloc(void *ptr, size_t size)
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parents:
diff changeset
172 {
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parents:
diff changeset
173 fz_context *ctx = get_hb_context();
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parents:
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174
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parents:
diff changeset
175 assert(ctx != NULL);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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176
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 return Memento_label(fz_realloc_no_throw(ctx, ptr, size), "hb");
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parents:
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178 }
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parents:
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179
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parents:
diff changeset
180 void fz_hb_free(void *ptr)
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parents:
diff changeset
181 {
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parents:
diff changeset
182 fz_context *ctx = get_hb_context();
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parents:
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183
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parents:
diff changeset
184 assert(ctx != NULL);
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parents:
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185
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parents:
diff changeset
186 fz_free(ctx, ptr);
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parents:
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187 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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188
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parents:
diff changeset
189 #endif