Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-set-digest.hh @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright © 2012 Google, Inc.
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3 *
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4 * This is part of HarfBuzz, a text shaping library.
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5 *
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6 * Permission is hereby granted, without written agreement and without
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7 * license or royalty fees, to use, copy, modify, and distribute this
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8 * software and its documentation for any purpose, provided that the
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9 * above copyright notice and the following two paragraphs appear in
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10 * all copies of this software.
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11 *
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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16 * DAMAGE.
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17 *
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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23 *
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24 * Google Author(s): Behdad Esfahbod
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25 */
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27 #ifndef HB_SET_DIGEST_HH
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28 #define HB_SET_DIGEST_HH
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29
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30 #include "hb.hh"
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31 #include "hb-machinery.hh"
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32
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33 /*
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34 * The set-digests here implement various "filters" that support
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35 * "approximate member query". Conceptually these are like Bloom
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36 * Filter and Quotient Filter, however, much smaller, faster, and
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37 * designed to fit the requirements of our uses for glyph coverage
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38 * queries.
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39 *
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40 * Our filters are highly accurate if the lookup covers fairly local
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41 * set of glyphs, but fully flooded and ineffective if coverage is
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42 * all over the place.
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43 *
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44 * The way these are used is that the filter is first populated by
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45 * a lookup's or subtable's Coverage table(s), and then when we
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46 * want to apply the lookup or subtable to a glyph, before trying
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47 * to apply, we ask the filter if the glyph may be covered. If it's
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48 * not, we return early.
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49 *
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50 * We use these filters both at the lookup-level, and then again,
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51 * at the subtable-level. Both have performance win.
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52 *
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53 * The main filter we use is a combination of three bits-pattern
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54 * filters. A bits-pattern filter checks a number of bits (5 or 6)
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55 * of the input number (glyph-id in this case) and checks whether
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56 * its pattern is amongst the patterns of any of the accepted values.
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57 * The accepted patterns are represented as a "long" integer. The
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58 * check is done using four bitwise operations only.
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59 */
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60
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61 template <typename mask_t, unsigned int shift>
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62 struct hb_set_digest_bits_pattern_t
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63 {
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64 static constexpr unsigned mask_bytes = sizeof (mask_t);
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65 static constexpr unsigned mask_bits = sizeof (mask_t) * 8;
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66 static constexpr unsigned num_bits = 0
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67 + (mask_bytes >= 1 ? 3 : 0)
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68 + (mask_bytes >= 2 ? 1 : 0)
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69 + (mask_bytes >= 4 ? 1 : 0)
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70 + (mask_bytes >= 8 ? 1 : 0)
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71 + (mask_bytes >= 16? 1 : 0)
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72 + 0;
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73
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74 static_assert ((shift < sizeof (hb_codepoint_t) * 8), "");
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75 static_assert ((shift + num_bits <= sizeof (hb_codepoint_t) * 8), "");
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76
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77 void init () { mask = 0; }
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78
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79 void add (const hb_set_digest_bits_pattern_t &o) { mask |= o.mask; }
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80
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81 void add (hb_codepoint_t g) { mask |= mask_for (g); }
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82
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83 bool add_range (hb_codepoint_t a, hb_codepoint_t b)
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84 {
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85 if ((b >> shift) - (a >> shift) >= mask_bits - 1)
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86 mask = (mask_t) -1;
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87 else {
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88 mask_t ma = mask_for (a);
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89 mask_t mb = mask_for (b);
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90 mask |= mb + (mb - ma) - (mb < ma);
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91 }
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92 return true;
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93 }
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94
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95 template <typename T>
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96 void add_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))
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97 {
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98 for (unsigned int i = 0; i < count; i++)
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99 {
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100 add (*array);
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101 array = &StructAtOffsetUnaligned<T> ((const void *) array, stride);
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102 }
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103 }
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diff changeset
104 template <typename T>
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diff changeset
105 void add_array (const hb_array_t<const T>& arr) { add_array (&arr, arr.len ()); }
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diff changeset
106 template <typename T>
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diff changeset
107 bool add_sorted_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))
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108 {
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109 add_array (array, count, stride);
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110 return true;
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111 }
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diff changeset
112 template <typename T>
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113 bool add_sorted_array (const hb_sorted_array_t<const T>& arr) { return add_sorted_array (&arr, arr.len ()); }
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114
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115 bool may_have (const hb_set_digest_bits_pattern_t &o) const
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116 { return mask & o.mask; }
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117
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118 bool may_have (hb_codepoint_t g) const
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119 { return mask & mask_for (g); }
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120
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121 private:
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122
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123 static mask_t mask_for (hb_codepoint_t g)
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124 { return ((mask_t) 1) << ((g >> shift) & (mask_bits - 1)); }
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125 mask_t mask;
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126 };
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127
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128 template <typename head_t, typename tail_t>
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129 struct hb_set_digest_combiner_t
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130 {
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131 void init ()
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132 {
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133 head.init ();
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134 tail.init ();
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135 }
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136
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137 void add (const hb_set_digest_combiner_t &o)
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138 {
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139 head.add (o.head);
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140 tail.add (o.tail);
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141 }
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142
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143 void add (hb_codepoint_t g)
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144 {
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145 head.add (g);
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146 tail.add (g);
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147 }
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148
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diff changeset
149 bool add_range (hb_codepoint_t a, hb_codepoint_t b)
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150 {
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151 return head.add_range (a, b) &&
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152 tail.add_range (a, b);
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153 }
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154 template <typename T>
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155 void add_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))
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156 {
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diff changeset
157 head.add_array (array, count, stride);
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158 tail.add_array (array, count, stride);
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159 }
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160 template <typename T>
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diff changeset
161 void add_array (const hb_array_t<const T>& arr) { add_array (&arr, arr.len ()); }
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diff changeset
162 template <typename T>
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diff changeset
163 bool add_sorted_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))
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164 {
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165 return head.add_sorted_array (array, count, stride) &&
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166 tail.add_sorted_array (array, count, stride);
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167 }
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diff changeset
168 template <typename T>
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diff changeset
169 bool add_sorted_array (const hb_sorted_array_t<const T>& arr) { return add_sorted_array (&arr, arr.len ()); }
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170
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diff changeset
171 bool may_have (const hb_set_digest_combiner_t &o) const
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172 {
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173 return head.may_have (o.head) && tail.may_have (o.tail);
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174 }
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175
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diff changeset
176 bool may_have (hb_codepoint_t g) const
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177 {
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diff changeset
178 return head.may_have (g) && tail.may_have (g);
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179 }
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180
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diff changeset
181 private:
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diff changeset
182 head_t head;
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183 tail_t tail;
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diff changeset
184 };
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185
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diff changeset
186
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diff changeset
187 /*
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diff changeset
188 * hb_set_digest_t
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diff changeset
189 *
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diff changeset
190 * This is a combination of digests that performs "best".
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diff changeset
191 * There is not much science to this: it's a result of intuition
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diff changeset
192 * and testing.
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diff changeset
193 */
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diff changeset
194 using hb_set_digest_t =
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diff changeset
195 hb_set_digest_combiner_t
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diff changeset
196 <
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diff changeset
197 hb_set_digest_bits_pattern_t<unsigned long, 4>,
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diff changeset
198 hb_set_digest_combiner_t
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diff changeset
199 <
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
200 hb_set_digest_bits_pattern_t<unsigned long, 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
201 hb_set_digest_bits_pattern_t<unsigned long, 9>
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
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 ;
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
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
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 #endif /* HB_SET_DIGEST_HH */