Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/OT/Layout/GSUB/SingleSubstFormat1.hh @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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1 #ifndef OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH
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2 #define OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH
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4 #include "Common.hh"
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6 namespace OT {
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7 namespace Layout {
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8 namespace GSUB_impl {
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10 template <typename Types>
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11 struct SingleSubstFormat1_3
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12 {
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13 protected:
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14 HBUINT16 format; /* Format identifier--format = 1 */
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15 typename Types::template OffsetTo<Coverage>
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16 coverage; /* Offset to Coverage table--from
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17 * beginning of Substitution table */
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18 typename Types::HBUINT
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19 deltaGlyphID; /* Add to original GlyphID to get
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20 * substitute GlyphID, modulo 0x10000 */
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22 public:
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23 DEFINE_SIZE_STATIC (2 + 2 * Types::size);
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25 bool sanitize (hb_sanitize_context_t *c) const
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26 {
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27 TRACE_SANITIZE (this);
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28 return_trace (coverage.sanitize (c, this) && deltaGlyphID.sanitize (c));
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29 }
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31 hb_codepoint_t get_mask () const
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32 { return (1 << (8 * Types::size)) - 1; }
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34 bool intersects (const hb_set_t *glyphs) const
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35 { return (this+coverage).intersects (glyphs); }
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37 bool may_have_non_1to1 () const
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38 { return false; }
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40 void closure (hb_closure_context_t *c) const
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41 {
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42 hb_codepoint_t d = deltaGlyphID;
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43 hb_codepoint_t mask = get_mask ();
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45 /* Help fuzzer avoid this function as much. */
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46 unsigned pop = (this+coverage).get_population ();
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47 if (pop >= mask)
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48 return;
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49
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50 hb_set_t intersection;
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51 (this+coverage).intersect_set (c->parent_active_glyphs (), intersection);
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53 /* In degenerate fuzzer-found fonts, but not real fonts,
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54 * this table can keep adding new glyphs in each round of closure.
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55 * Refuse to close-over, if it maps glyph range to overlapping range. */
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56 hb_codepoint_t min_before = intersection.get_min ();
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57 hb_codepoint_t max_before = intersection.get_max ();
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58 hb_codepoint_t min_after = (min_before + d) & mask;
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59 hb_codepoint_t max_after = (max_before + d) & mask;
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60 if (intersection.get_population () == max_before - min_before + 1 &&
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61 ((min_before <= min_after && min_after <= max_before) ||
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62 (min_before <= max_after && max_after <= max_before)))
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63 return;
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64
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65 + hb_iter (intersection)
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66 | hb_map ([d, mask] (hb_codepoint_t g) { return (g + d) & mask; })
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67 | hb_sink (c->output)
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68 ;
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69 }
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71 void closure_lookups (hb_closure_lookups_context_t *c) const {}
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73 void collect_glyphs (hb_collect_glyphs_context_t *c) const
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74 {
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75 if (unlikely (!(this+coverage).collect_coverage (c->input))) return;
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76 hb_codepoint_t d = deltaGlyphID;
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77 hb_codepoint_t mask = get_mask ();
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79 + hb_iter (this+coverage)
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80 | hb_map ([d, mask] (hb_codepoint_t g) { return (g + d) & mask; })
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81 | hb_sink (c->output)
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82 ;
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83 }
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85 const Coverage &get_coverage () const { return this+coverage; }
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87 bool would_apply (hb_would_apply_context_t *c) const
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88 { return c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED; }
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90 bool apply (hb_ot_apply_context_t *c) const
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91 {
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92 TRACE_APPLY (this);
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93 hb_codepoint_t glyph_id = c->buffer->cur().codepoint;
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94 unsigned int index = (this+coverage).get_coverage (glyph_id);
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95 if (likely (index == NOT_COVERED)) return_trace (false);
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97 hb_codepoint_t d = deltaGlyphID;
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98 hb_codepoint_t mask = get_mask ();
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99
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100 glyph_id = (glyph_id + d) & mask;
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101
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102 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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103 {
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104 c->buffer->sync_so_far ();
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105 c->buffer->message (c->font,
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106 "replacing glyph at %d (single substitution)",
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107 c->buffer->idx);
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108 }
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109
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110 c->replace_glyph (glyph_id);
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111
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112 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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113 {
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114 c->buffer->message (c->font,
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115 "replaced glyph at %d (single substitution)",
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116 c->buffer->idx - 1);
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117 }
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118
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119 return_trace (true);
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120 }
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121
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122 template<typename Iterator,
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123 hb_requires (hb_is_sorted_source_of (Iterator, hb_codepoint_t))>
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124 bool serialize (hb_serialize_context_t *c,
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125 Iterator glyphs,
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126 unsigned delta)
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127 {
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128 TRACE_SERIALIZE (this);
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129 if (unlikely (!c->extend_min (this))) return_trace (false);
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130 if (unlikely (!coverage.serialize_serialize (c, glyphs))) return_trace (false);
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131 c->check_assign (deltaGlyphID, delta, HB_SERIALIZE_ERROR_INT_OVERFLOW);
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132 return_trace (true);
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133 }
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134
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135 bool subset (hb_subset_context_t *c) const
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136 {
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137 TRACE_SUBSET (this);
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138 const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
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139 const hb_map_t &glyph_map = *c->plan->glyph_map;
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140
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141 hb_codepoint_t d = deltaGlyphID;
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parents:
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142 hb_codepoint_t mask = get_mask ();
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143
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144 hb_set_t intersection;
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parents:
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145 (this+coverage).intersect_set (glyphset, intersection);
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parents:
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146
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147 auto it =
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148 + hb_iter (intersection)
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149 | hb_map_retains_sorting ([d, mask] (hb_codepoint_t g) {
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150 return hb_codepoint_pair_t (g,
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parents:
diff changeset
151 (g + d) & mask); })
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152 | hb_filter (glyphset, hb_second)
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153 | hb_map_retains_sorting ([&] (hb_codepoint_pair_t p) -> hb_codepoint_pair_t
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154 { return hb_pair (glyph_map[p.first], glyph_map[p.second]); })
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parents:
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155 ;
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parents:
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156
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parents:
diff changeset
157 bool ret = bool (it);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 SingleSubst_serialize (c->serializer, it);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 return_trace (ret);
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parents:
diff changeset
160 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 };
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parents:
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162
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parents:
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163 }
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parents:
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164 }
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parents:
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165 }
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166
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parents:
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167
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parents:
diff changeset
168 #endif /* OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH */