Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/OT/Layout/GPOS/SinglePosFormat2.hh @ 31:baeb8bdeff3a

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 13:11:30 +0200
parents b50eed0cc0ef
children
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1 #ifndef OT_LAYOUT_GPOS_SINGLEPOSFORMAT2_HH
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2 #define OT_LAYOUT_GPOS_SINGLEPOSFORMAT2_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 GPOS_impl {
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10 struct SinglePosFormat2
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11 {
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12 protected:
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13 HBUINT16 format; /* Format identifier--format = 2 */
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14 Offset16To<Coverage>
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15 coverage; /* Offset to Coverage table--from
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16 * beginning of subtable */
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17 ValueFormat valueFormat; /* Defines the types of data in the
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18 * ValueRecord */
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19 HBUINT16 valueCount; /* Number of ValueRecords */
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20 ValueRecord values; /* Array of ValueRecords--positioning
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21 * values applied to glyphs */
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22 public:
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23 DEFINE_SIZE_ARRAY (8, values);
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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 (c->check_struct (this) &&
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29 coverage.sanitize (c, this) &&
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30 valueFormat.sanitize_values (c, this, values, valueCount));
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31 }
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33 bool intersects (const hb_set_t *glyphs) const
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34 { return (this+coverage).intersects (glyphs); }
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36 void closure_lookups (hb_closure_lookups_context_t *c) const {}
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37 void collect_variation_indices (hb_collect_variation_indices_context_t *c) const
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38 {
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39 if (!valueFormat.has_device ()) return;
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41 auto it =
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42 + hb_zip (this+coverage, hb_range ((unsigned) valueCount))
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43 | hb_filter (c->glyph_set, hb_first)
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44 ;
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46 if (!it) return;
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48 unsigned sub_length = valueFormat.get_len ();
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49 const hb_array_t<const Value> values_array = values.as_array (valueCount * sub_length);
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51 for (unsigned i : + it
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52 | hb_map (hb_second))
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53 valueFormat.collect_variation_indices (c, this, values_array.sub_array (i * sub_length, sub_length));
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55 }
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57 void collect_glyphs (hb_collect_glyphs_context_t *c) const
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58 { if (unlikely (!(this+coverage).collect_coverage (c->input))) return; }
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60 const Coverage &get_coverage () const { return this+coverage; }
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62 ValueFormat get_value_format () const { return valueFormat; }
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64 bool apply (hb_ot_apply_context_t *c) const
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65 {
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66 TRACE_APPLY (this);
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67 hb_buffer_t *buffer = c->buffer;
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68 unsigned int index = (this+coverage).get_coverage (buffer->cur().codepoint);
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69 if (likely (index == NOT_COVERED)) return_trace (false);
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71 if (unlikely (index >= valueCount)) return_trace (false);
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73 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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74 {
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75 c->buffer->message (c->font,
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76 "positioning glyph at %d",
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77 c->buffer->idx);
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78 }
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80 valueFormat.apply_value (c, this,
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81 &values[index * valueFormat.get_len ()],
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82 buffer->cur_pos());
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84 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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85 {
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86 c->buffer->message (c->font,
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87 "positioned glyph at %d",
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88 c->buffer->idx);
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89 }
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91 buffer->idx++;
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92 return_trace (true);
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93 }
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95 bool
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96 position_single (hb_font_t *font,
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97 hb_direction_t direction,
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98 hb_codepoint_t gid,
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99 hb_glyph_position_t &pos) const
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100 {
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101 unsigned int index = (this+coverage).get_coverage (gid);
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102 if (likely (index == NOT_COVERED)) return false;
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103 if (unlikely (index >= valueCount)) return false;
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104
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105 /* This is ugly... */
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106 hb_buffer_t buffer;
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107 buffer.props.direction = direction;
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108 OT::hb_ot_apply_context_t c (1, font, &buffer);
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109
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110 valueFormat.apply_value (&c, this,
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111 &values[index * valueFormat.get_len ()],
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112 pos);
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113 return true;
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114 }
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115
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116
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117 template<typename Iterator,
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118 typename SrcLookup,
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119 hb_requires (hb_is_iterator (Iterator))>
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120 void serialize (hb_serialize_context_t *c,
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121 const SrcLookup *src,
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122 Iterator it,
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123 ValueFormat newFormat,
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124 const hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> *layout_variation_idx_delta_map)
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125 {
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126 auto out = c->extend_min (this);
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127 if (unlikely (!out)) return;
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128 if (unlikely (!c->check_assign (valueFormat, newFormat, HB_SERIALIZE_ERROR_INT_OVERFLOW))) return;
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129 if (unlikely (!c->check_assign (valueCount, it.len (), HB_SERIALIZE_ERROR_ARRAY_OVERFLOW))) return;
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130
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131 + it
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132 | hb_map (hb_second)
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133 | hb_apply ([&] (hb_array_t<const Value> _)
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134 { src->get_value_format ().copy_values (c, newFormat, src, &_, layout_variation_idx_delta_map); })
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135 ;
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136
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137 auto glyphs =
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138 + it
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139 | hb_map_retains_sorting (hb_first)
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140 ;
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141
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142 coverage.serialize_serialize (c, glyphs);
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143 }
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144
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145 bool subset (hb_subset_context_t *c) const
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146 {
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147 TRACE_SUBSET (this);
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148 const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
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149 const hb_map_t &glyph_map = *c->plan->glyph_map;
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150
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151 unsigned sub_length = valueFormat.get_len ();
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152 auto values_array = values.as_array (valueCount * sub_length);
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153
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154 auto it =
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155 + hb_zip (this+coverage, hb_range ((unsigned) valueCount))
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156 | hb_filter (glyphset, hb_first)
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157 | hb_map_retains_sorting ([&] (const hb_pair_t<hb_codepoint_t, unsigned>& _)
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158 {
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159 return hb_pair (glyph_map[_.first],
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160 values_array.sub_array (_.second * sub_length,
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161 sub_length));
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162 })
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163 ;
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164
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165 bool ret = bool (it);
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166 SinglePos_serialize (c->serializer, this, it, c->plan->layout_variation_idx_delta_map, c->plan->all_axes_pinned);
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167 return_trace (ret);
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168 }
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169 };
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170
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171
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172 }
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173 }
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174 }
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175
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176 #endif /* OT_LAYOUT_GPOS_SINGLEPOSFORMAT2_HH */