Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/graph/serialize.hh @ 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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children
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1 /*
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2 * Copyright © 2022 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): Garret Rieger
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25 */
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26
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27 #ifndef GRAPH_SERIALIZE_HH
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28 #define GRAPH_SERIALIZE_HH
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29
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30 namespace graph {
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31
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32 struct overflow_record_t
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33 {
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34 unsigned parent;
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35 unsigned child;
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36
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37 bool operator != (const overflow_record_t o) const
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38 { return !(*this == o); }
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39
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40 inline bool operator == (const overflow_record_t& o) const
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41 {
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42 return parent == o.parent &&
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43 child == o.child;
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44 }
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45
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46 inline uint32_t hash () const
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47 {
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48 uint32_t current = 0;
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49 current = current * 31 + hb_hash (parent);
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50 current = current * 31 + hb_hash (child);
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51 return current;
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52 }
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53 };
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54
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55 inline
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56 int64_t compute_offset (
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57 const graph_t& graph,
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58 unsigned parent_idx,
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59 const hb_serialize_context_t::object_t::link_t& link)
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60 {
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61 const auto& parent = graph.vertices_[parent_idx];
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62 const auto& child = graph.vertices_[link.objidx];
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63 int64_t offset = 0;
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64 switch ((hb_serialize_context_t::whence_t) link.whence) {
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65 case hb_serialize_context_t::whence_t::Head:
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66 offset = child.start - parent.start; break;
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67 case hb_serialize_context_t::whence_t::Tail:
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68 offset = child.start - parent.end; break;
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69 case hb_serialize_context_t::whence_t::Absolute:
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70 offset = child.start; break;
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71 }
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72
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73 assert (offset >= link.bias);
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74 offset -= link.bias;
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75 return offset;
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76 }
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77
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78 inline
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79 bool is_valid_offset (int64_t offset,
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80 const hb_serialize_context_t::object_t::link_t& link)
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81 {
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82 if (unlikely (!link.width))
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83 // Virtual links can't overflow.
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84 return link.is_signed || offset >= 0;
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85
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86 if (link.is_signed)
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87 {
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88 if (link.width == 4)
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89 return offset >= -((int64_t) 1 << 31) && offset < ((int64_t) 1 << 31);
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90 else
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91 return offset >= -(1 << 15) && offset < (1 << 15);
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92 }
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93 else
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94 {
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95 if (link.width == 4)
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96 return offset >= 0 && offset < ((int64_t) 1 << 32);
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97 else if (link.width == 3)
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98 return offset >= 0 && offset < ((int32_t) 1 << 24);
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99 else
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100 return offset >= 0 && offset < (1 << 16);
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101 }
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parents:
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102 }
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parents:
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103
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parents:
diff changeset
104 /*
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parents:
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105 * Will any offsets overflow on graph when it's serialized?
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 */
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parents:
diff changeset
107 inline bool
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parents:
diff changeset
108 will_overflow (graph_t& graph,
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parents:
diff changeset
109 hb_vector_t<overflow_record_t>* overflows = nullptr)
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parents:
diff changeset
110 {
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parents:
diff changeset
111 if (overflows) overflows->resize (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
112 graph.update_positions ();
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parents:
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113
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parents:
diff changeset
114 hb_hashmap_t<overflow_record_t*, bool> record_set;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
115 const auto& vertices = graph.vertices_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
116 for (int parent_idx = vertices.length - 1; parent_idx >= 0; parent_idx--)
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parents:
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117 {
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118 // Don't need to check virtual links for overflow
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parents:
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119 for (const auto& link : vertices[parent_idx].obj.real_links)
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120 {
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121 int64_t offset = compute_offset (graph, parent_idx, link);
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122 if (is_valid_offset (offset, link))
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123 continue;
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124
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125 if (!overflows) return true;
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126
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diff changeset
127 overflow_record_t r;
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diff changeset
128 r.parent = parent_idx;
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129 r.child = link.objidx;
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130 if (record_set.has(&r)) continue; // don't keep duplicate overflows.
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131
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132 overflows->push (r);
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133 record_set.set(&r, true);
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134 }
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135 }
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136
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parents:
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137 if (!overflows) return false;
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parents:
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138 return overflows->length;
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139 }
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140
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141 inline
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142 void print_overflows (graph_t& graph,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 const hb_vector_t<overflow_record_t>& overflows)
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144 {
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145 if (!DEBUG_ENABLED(SUBSET_REPACK)) return;
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146
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parents:
diff changeset
147 graph.update_parents ();
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148 int limit = 10;
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149 for (const auto& o : overflows)
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150 {
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parents:
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151 if (!limit--) break;
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parents:
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152 const auto& parent = graph.vertices_[o.parent];
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parents:
diff changeset
153 const auto& child = graph.vertices_[o.child];
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parents:
diff changeset
154 DEBUG_MSG (SUBSET_REPACK, nullptr,
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155 " overflow from "
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diff changeset
156 "%4d (%4d in, %4d out, space %2d) => "
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parents:
diff changeset
157 "%4d (%4d in, %4d out, space %2d)",
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parents:
diff changeset
158 o.parent,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 parent.incoming_edges (),
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 parent.obj.real_links.length + parent.obj.virtual_links.length,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 graph.space_for (o.parent),
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parents:
diff changeset
162 o.child,
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parents:
diff changeset
163 child.incoming_edges (),
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parents:
diff changeset
164 child.obj.real_links.length + child.obj.virtual_links.length,
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parents:
diff changeset
165 graph.space_for (o.child));
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parents:
diff changeset
166 }
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parents:
diff changeset
167 if (overflows.length > 10) {
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parents:
diff changeset
168 DEBUG_MSG (SUBSET_REPACK, nullptr, " ... plus %d more overflows.", overflows.length - 10);
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diff changeset
169 }
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170 }
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171
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parents:
diff changeset
172 template <typename O> inline void
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parents:
diff changeset
173 serialize_link_of_type (const hb_serialize_context_t::object_t::link_t& link,
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parents:
diff changeset
174 char* head,
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parents:
diff changeset
175 hb_serialize_context_t* c)
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parents:
diff changeset
176 {
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parents:
diff changeset
177 OT::Offset<O>* offset = reinterpret_cast<OT::Offset<O>*> (head + link.position);
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parents:
diff changeset
178 *offset = 0;
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parents:
diff changeset
179 c->add_link (*offset,
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parents:
diff changeset
180 // serializer has an extra nil object at the start of the
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parents:
diff changeset
181 // object array. So all id's are +1 of what our id's are.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 link.objidx + 1,
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parents:
diff changeset
183 (hb_serialize_context_t::whence_t) link.whence,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 link.bias);
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parents:
diff changeset
185 }
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parents:
diff changeset
186
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parents:
diff changeset
187 inline
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 void serialize_link (const hb_serialize_context_t::object_t::link_t& link,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 char* head,
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
190 hb_serialize_context_t* c)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 {
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
192 switch (link.width)
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parents:
diff changeset
193 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 case 0:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 // Virtual links aren't serialized.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 return;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197 case 4:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 if (link.is_signed)
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parents:
diff changeset
199 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
200 serialize_link_of_type<OT::HBINT32> (link, head, 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
201 } else {
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 serialize_link_of_type<OT::HBUINT32> (link, head, c);
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203 }
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204 return;
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205 case 2:
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206 if (link.is_signed)
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207 {
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208 serialize_link_of_type<OT::HBINT16> (link, head, c);
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209 } else {
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210 serialize_link_of_type<OT::HBUINT16> (link, head, c);
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211 }
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212 return;
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213 case 3:
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214 serialize_link_of_type<OT::HBUINT24> (link, head, c);
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215 return;
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216 default:
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217 // Unexpected link width.
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218 assert (0);
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219 }
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220 }
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221
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222 /*
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223 * serialize graph into the provided serialization buffer.
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224 */
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225 inline hb_blob_t* serialize (const graph_t& graph)
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226 {
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227 hb_vector_t<char> buffer;
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228 size_t size = graph.total_size_in_bytes ();
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229 if (!buffer.alloc (size)) {
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230 DEBUG_MSG (SUBSET_REPACK, nullptr, "Unable to allocate output buffer.");
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231 return nullptr;
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232 }
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233 hb_serialize_context_t c((void *) buffer, size);
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234
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235 c.start_serialize<void> ();
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236 const auto& vertices = graph.vertices_;
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237 for (unsigned i = 0; i < vertices.length; i++) {
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238 c.push ();
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239
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240 size_t size = vertices[i].obj.tail - vertices[i].obj.head;
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241 char* start = c.allocate_size <char> (size);
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242 if (!start) {
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243 DEBUG_MSG (SUBSET_REPACK, nullptr, "Buffer out of space.");
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244 return nullptr;
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245 }
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246
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247 hb_memcpy (start, vertices[i].obj.head, size);
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248
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249 // Only real links needs to be serialized.
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diff changeset
250 for (const auto& link : vertices[i].obj.real_links)
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251 serialize_link (link, start, &c);
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252
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253 // All duplications are already encoded in the graph, so don't
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254 // enable sharing during packing.
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255 c.pop_pack (false);
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256 }
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257 c.end_serialize ();
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258
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diff changeset
259 if (c.in_error ()) {
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260 DEBUG_MSG (SUBSET_REPACK, nullptr, "Error during serialization. Err flag: %d",
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parents:
diff changeset
261 c.errors);
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parents:
diff changeset
262 return nullptr;
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parents:
diff changeset
263 }
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parents:
diff changeset
264
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diff changeset
265 return c.copy_blob ();
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diff changeset
266 }
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parents:
diff changeset
267
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diff changeset
268 } // namespace graph
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diff changeset
269
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diff changeset
270 #endif // GRAPH_SERIALIZE_HH