annotate mupdf-source/thirdparty/harfbuzz/src/hb-ot-var-mvar-table.hh @ 46:7ee69f120f19 default tip

>>>>> 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
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1 /*
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2 * Copyright © 2017 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_OT_VAR_MVAR_TABLE_HH
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28 #define HB_OT_VAR_MVAR_TABLE_HH
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30 #include "hb-ot-layout-common.hh"
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33 namespace OT {
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35
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36 struct VariationValueRecord
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37 {
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38 bool sanitize (hb_sanitize_context_t *c) const
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39 {
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40 TRACE_SANITIZE (this);
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41 return_trace (c->check_struct (this));
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42 }
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44 public:
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45 Tag valueTag; /* Four-byte tag identifying a font-wide measure. */
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46 VarIdx varIdx; /* Outer/inner index into VariationStore item. */
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47
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48 public:
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49 DEFINE_SIZE_STATIC (8);
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50 };
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51
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52
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53 /*
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54 * MVAR -- Metrics Variations
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55 * https://docs.microsoft.com/en-us/typography/opentype/spec/mvar
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56 */
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57 #define HB_OT_TAG_MVAR HB_TAG('M','V','A','R')
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58
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59 struct MVAR
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60 {
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61 static constexpr hb_tag_t tableTag = HB_OT_TAG_MVAR;
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62
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63 bool sanitize (hb_sanitize_context_t *c) const
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64 {
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65 TRACE_SANITIZE (this);
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66 return_trace (version.sanitize (c) &&
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67 likely (version.major == 1) &&
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68 c->check_struct (this) &&
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69 valueRecordSize >= VariationValueRecord::static_size &&
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70 varStore.sanitize (c, this) &&
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71 c->check_range (valuesZ.arrayZ,
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72 valueRecordCount,
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73 valueRecordSize));
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74 }
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75
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76 float get_var (hb_tag_t tag,
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77 const int *coords, unsigned int coord_count) const
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78 {
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79 const VariationValueRecord *record;
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80 record = (VariationValueRecord *) hb_bsearch (tag,
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81 (const VariationValueRecord *)
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82 (const HBUINT8 *) valuesZ,
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83 valueRecordCount, valueRecordSize,
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84 tag_compare);
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85 if (!record)
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86 return 0.;
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87
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88 return (this+varStore).get_delta (record->varIdx, coords, coord_count);
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89 }
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90
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91 protected:
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92 static int tag_compare (const void *pa, const void *pb)
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93 {
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94 const hb_tag_t *a = (const hb_tag_t *) pa;
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95 const Tag *b = (const Tag *) pb;
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96 return b->cmp (*a);
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97 }
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98
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99 protected:
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100 FixedVersion<>version; /* Version of the metrics variation table
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101 * initially set to 0x00010000u */
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102 HBUINT16 reserved; /* Not used; set to 0. */
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103 HBUINT16 valueRecordSize;/* The size in bytes of each value record —
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104 * must be greater than zero. */
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105 HBUINT16 valueRecordCount;/* The number of value records — may be zero. */
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106 Offset16To<VariationStore>
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107 varStore; /* Offset to item variation store table. */
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108 UnsizedArrayOf<HBUINT8>
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109 valuesZ; /* Array of value records. The records must be
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110 * in binary order of their valueTag field. */
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111
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112 public:
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113 DEFINE_SIZE_ARRAY (12, valuesZ);
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114 };
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115
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116 } /* namespace OT */
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117
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118
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119 #endif /* HB_OT_VAR_MVAR_TABLE_HH */