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annotate mupdf-source/thirdparty/harfbuzz/src/hb-ot-meta-table.hh @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright © 2019 Ebrahim Byagowi
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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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25 #ifndef HB_OT_META_TABLE_HH
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26 #define HB_OT_META_TABLE_HH
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28 #include "hb-open-type.hh"
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30 /*
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31 * meta -- Metadata Table
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32 * https://docs.microsoft.com/en-us/typography/opentype/spec/meta
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33 * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6meta.html
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34 */
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35 #define HB_OT_TAG_meta HB_TAG ('m','e','t','a')
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38 namespace OT {
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41 struct DataMap
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42 {
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43 int cmp (hb_tag_t a) const { return tag.cmp (a); }
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45 hb_tag_t get_tag () const { return tag; }
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47 hb_blob_t *reference_entry (hb_blob_t *meta_blob) const
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48 { return hb_blob_create_sub_blob (meta_blob, dataZ, dataLength); }
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50 bool sanitize (hb_sanitize_context_t *c, const void *base) const
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51 {
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52 TRACE_SANITIZE (this);
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53 return_trace (likely (c->check_struct (this) &&
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54 dataZ.sanitize (c, base, dataLength)));
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55 }
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56
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57 protected:
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58 Tag tag; /* A tag indicating the type of metadata. */
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59 NNOffset32To<UnsizedArrayOf<HBUINT8>>
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60 dataZ; /* Offset in bytes from the beginning of the
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61 * metadata table to the data for this tag. */
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62 HBUINT32 dataLength; /* Length of the data. The data is not required to
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63 * be padded to any byte boundary. */
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64 public:
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65 DEFINE_SIZE_STATIC (12);
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66 };
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68 struct meta
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69 {
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70 static constexpr hb_tag_t tableTag = HB_OT_TAG_meta;
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72 struct accelerator_t
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73 {
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74 accelerator_t (hb_face_t *face)
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75 { table = hb_sanitize_context_t ().reference_table<meta> (face); }
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76 ~accelerator_t () { table.destroy (); }
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78 hb_blob_t *reference_entry (hb_tag_t tag) const
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79 { return table->dataMaps.lsearch (tag).reference_entry (table.get_blob ()); }
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81 unsigned int get_entries (unsigned int start_offset,
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82 unsigned int *count,
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83 hb_ot_meta_tag_t *entries) const
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84 {
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85 if (count)
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86 {
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87 + table->dataMaps.as_array ().sub_array (start_offset, count)
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88 | hb_map (&DataMap::get_tag)
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89 | hb_map ([](hb_tag_t tag) { return (hb_ot_meta_tag_t) tag; })
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90 | hb_sink (hb_array (entries, *count))
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91 ;
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92 }
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93 return table->dataMaps.len;
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94 }
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95
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96 private:
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97 hb_blob_ptr_t<meta> table;
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98 };
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99
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100 bool sanitize (hb_sanitize_context_t *c) const
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101 {
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102 TRACE_SANITIZE (this);
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103 return_trace (likely (c->check_struct (this) &&
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104 version == 1 &&
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105 dataMaps.sanitize (c, this)));
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106 }
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107
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108 protected:
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109 HBUINT32 version; /* Version number of the metadata table — set to 1. */
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110 HBUINT32 flags; /* Flags — currently unused; set to 0. */
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111 HBUINT32 dataOffset;
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112 /* Per Apple specification:
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113 * Offset from the beginning of the table to the data.
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114 * Per OT specification:
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115 * Reserved. Not used; should be set to 0. */
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116 Array32Of<DataMap>
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117 dataMaps;/* Array of data map records. */
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118 public:
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119 DEFINE_SIZE_ARRAY (16, dataMaps);
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120 };
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121
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122 struct meta_accelerator_t : meta::accelerator_t {
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123 meta_accelerator_t (hb_face_t *face) : meta::accelerator_t (face) {}
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124 };
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125
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126 } /* namespace OT */
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127
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128
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129 #endif /* HB_OT_META_TABLE_HH */