Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/graph/coverage-graph.hh @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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27 #include "graph.hh"
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28 #include "../OT/Layout/Common/Coverage.hh"
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30 #ifndef GRAPH_COVERAGE_GRAPH_HH
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31 #define GRAPH_COVERAGE_GRAPH_HH
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33 namespace graph {
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35 struct CoverageFormat1 : public OT::Layout::Common::CoverageFormat1_3<SmallTypes>
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36 {
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37 bool sanitize (graph_t::vertex_t& vertex) const
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38 {
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39 int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
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40 constexpr unsigned min_size = OT::Layout::Common::CoverageFormat1_3<SmallTypes>::min_size;
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41 if (vertex_len < min_size) return false;
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42 return vertex_len >= min_size + glyphArray.get_size () - glyphArray.len.get_size ();
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43 }
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44 };
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46 struct CoverageFormat2 : public OT::Layout::Common::CoverageFormat2_4<SmallTypes>
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47 {
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48 bool sanitize (graph_t::vertex_t& vertex) const
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49 {
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50 int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
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51 constexpr unsigned min_size = OT::Layout::Common::CoverageFormat2_4<SmallTypes>::min_size;
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52 if (vertex_len < min_size) return false;
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53 return vertex_len >= min_size + rangeRecord.get_size () - rangeRecord.len.get_size ();
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54 }
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55 };
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57 struct Coverage : public OT::Layout::Common::Coverage
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58 {
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59 static Coverage* clone_coverage (gsubgpos_graph_context_t& c,
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60 unsigned coverage_id,
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61 unsigned new_parent_id,
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62 unsigned link_position,
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63 unsigned start, unsigned end)
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64
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65 {
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66 unsigned coverage_size = c.graph.vertices_[coverage_id].table_size ();
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67 auto& coverage_v = c.graph.vertices_[coverage_id];
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68 Coverage* coverage_table = (Coverage*) coverage_v.obj.head;
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69 if (!coverage_table || !coverage_table->sanitize (coverage_v))
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70 return nullptr;
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71
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72 auto new_coverage =
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73 + hb_zip (coverage_table->iter (), hb_range ())
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74 | hb_filter ([&] (hb_pair_t<unsigned, unsigned> p) {
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75 return p.second >= start && p.second < end;
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76 })
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77 | hb_map_retains_sorting (hb_first)
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78 ;
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79
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80 return add_coverage (c, new_parent_id, link_position, new_coverage, coverage_size);
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81 }
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82
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83 template<typename It>
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84 static Coverage* add_coverage (gsubgpos_graph_context_t& c,
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85 unsigned parent_id,
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86 unsigned link_position,
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87 It glyphs,
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88 unsigned max_size)
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89 {
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90 unsigned coverage_prime_id = c.graph.new_node (nullptr, nullptr);
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91 auto& coverage_prime_vertex = c.graph.vertices_[coverage_prime_id];
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92 if (!make_coverage (c, glyphs, coverage_prime_id, max_size))
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93 return nullptr;
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94
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95 auto* coverage_link = c.graph.vertices_[parent_id].obj.real_links.push ();
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96 coverage_link->width = SmallTypes::size;
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97 coverage_link->objidx = coverage_prime_id;
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98 coverage_link->position = link_position;
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99 coverage_prime_vertex.parents.push (parent_id);
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100
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101 return (Coverage*) coverage_prime_vertex.obj.head;
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102 }
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103
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104 template<typename It>
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105 static bool make_coverage (gsubgpos_graph_context_t& c,
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106 It glyphs,
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107 unsigned dest_obj,
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108 unsigned max_size)
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109 {
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110 char* buffer = (char*) hb_calloc (1, max_size);
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111 hb_serialize_context_t serializer (buffer, max_size);
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112 OT::Layout::Common::Coverage_serialize (&serializer, glyphs);
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113 serializer.end_serialize ();
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114 if (serializer.in_error ())
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115 {
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116 hb_free (buffer);
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117 return false;
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118 }
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119
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120 hb_bytes_t coverage_copy = serializer.copy_bytes ();
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121 c.add_buffer ((char *) coverage_copy.arrayZ); // Give ownership to the context, it will cleanup the buffer.
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122
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123 auto& obj = c.graph.vertices_[dest_obj].obj;
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124 obj.head = (char *) coverage_copy.arrayZ;
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125 obj.tail = obj.head + coverage_copy.length;
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126
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127 hb_free (buffer);
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128 return true;
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129 }
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130
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131 bool sanitize (graph_t::vertex_t& vertex) const
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132 {
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133 int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
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134 if (vertex_len < OT::Layout::Common::Coverage::min_size) return false;
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135 switch (u.format)
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136 {
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137 case 1: return ((CoverageFormat1*)this)->sanitize (vertex);
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138 case 2: return ((CoverageFormat2*)this)->sanitize (vertex);
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139 #ifndef HB_NO_BEYOND_64K
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140 // Not currently supported
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141 case 3:
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142 case 4:
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143 #endif
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144 default: return false;
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145 }
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146 }
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147 };
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148
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149
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150 }
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151
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152 #endif // GRAPH_COVERAGE_GRAPH_HH