Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-ot-kern-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 © 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_KERN_TABLE_HH
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28 #define HB_OT_KERN_TABLE_HH
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30 #include "hb-aat-layout-kerx-table.hh"
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32
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33 /*
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34 * kern -- Kerning
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35 * https://docs.microsoft.com/en-us/typography/opentype/spec/kern
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36 * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6kern.html
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37 */
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38 #define HB_OT_TAG_kern HB_TAG('k','e','r','n')
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41 namespace OT {
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44 template <typename KernSubTableHeader>
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45 struct KernSubTableFormat3
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46 {
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47 int get_kerning (hb_codepoint_t left, hb_codepoint_t right) const
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48 {
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49 hb_array_t<const FWORD> kernValue = kernValueZ.as_array (kernValueCount);
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50 hb_array_t<const HBUINT8> leftClass = StructAfter<const UnsizedArrayOf<HBUINT8>> (kernValue).as_array (glyphCount);
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51 hb_array_t<const HBUINT8> rightClass = StructAfter<const UnsizedArrayOf<HBUINT8>> (leftClass).as_array (glyphCount);
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52 hb_array_t<const HBUINT8> kernIndex = StructAfter<const UnsizedArrayOf<HBUINT8>> (rightClass).as_array (leftClassCount * rightClassCount);
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54 unsigned int leftC = leftClass[left];
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55 unsigned int rightC = rightClass[right];
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56 if (unlikely (leftC >= leftClassCount || rightC >= rightClassCount))
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57 return 0;
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58 unsigned int i = leftC * rightClassCount + rightC;
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59 return kernValue[kernIndex[i]];
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60 }
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61
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62 bool apply (AAT::hb_aat_apply_context_t *c) const
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63 {
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64 TRACE_APPLY (this);
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65
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66 if (!c->plan->requested_kerning)
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67 return false;
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68
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69 if (header.coverage & header.Backwards)
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70 return false;
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72 hb_kern_machine_t<KernSubTableFormat3> machine (*this, header.coverage & header.CrossStream);
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73 machine.kern (c->font, c->buffer, c->plan->kern_mask);
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75 return_trace (true);
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76 }
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78 bool sanitize (hb_sanitize_context_t *c) const
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79 {
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80 TRACE_SANITIZE (this);
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81 return_trace (c->check_struct (this) &&
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82 c->check_range (kernValueZ,
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83 kernValueCount * sizeof (FWORD) +
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84 glyphCount * 2 +
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85 leftClassCount * rightClassCount));
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86 }
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87
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88 protected:
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89 KernSubTableHeader
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90 header;
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91 HBUINT16 glyphCount; /* The number of glyphs in this font. */
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92 HBUINT8 kernValueCount; /* The number of kerning values. */
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93 HBUINT8 leftClassCount; /* The number of left-hand classes. */
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94 HBUINT8 rightClassCount;/* The number of right-hand classes. */
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95 HBUINT8 flags; /* Set to zero (reserved for future use). */
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96 UnsizedArrayOf<FWORD>
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97 kernValueZ; /* The kerning values.
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98 * Length kernValueCount. */
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99 #if 0
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100 UnsizedArrayOf<HBUINT8>
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101 leftClass; /* The left-hand classes.
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102 * Length glyphCount. */
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103 UnsizedArrayOf<HBUINT8>
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104 rightClass; /* The right-hand classes.
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105 * Length glyphCount. */
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106 UnsizedArrayOf<HBUINT8>kernIndex;
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107 /* The indices into the kernValue array.
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108 * Length leftClassCount * rightClassCount */
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109 #endif
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110 public:
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111 DEFINE_SIZE_ARRAY (KernSubTableHeader::static_size + 6, kernValueZ);
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112 };
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113
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114 template <typename KernSubTableHeader>
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115 struct KernSubTable
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116 {
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117 unsigned int get_size () const { return u.header.length; }
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118 unsigned int get_type () const { return u.header.format; }
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119
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120 int get_kerning (hb_codepoint_t left, hb_codepoint_t right) const
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121 {
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122 switch (get_type ()) {
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123 /* This method hooks up to hb_font_t's get_h_kerning. Only support Format0. */
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124 case 0: return u.format0.get_kerning (left, right);
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125 default:return 0;
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126 }
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127 }
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128
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129 template <typename context_t, typename ...Ts>
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130 typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
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131 {
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132 unsigned int subtable_type = get_type ();
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133 TRACE_DISPATCH (this, subtable_type);
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134 switch (subtable_type) {
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135 case 0: return_trace (c->dispatch (u.format0));
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136 #ifndef HB_NO_AAT_SHAPE
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137 case 1: return_trace (u.header.apple ? c->dispatch (u.format1, std::forward<Ts> (ds)...) : c->default_return_value ());
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138 #endif
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139 case 2: return_trace (c->dispatch (u.format2));
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140 #ifndef HB_NO_AAT_SHAPE
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141 case 3: return_trace (u.header.apple ? c->dispatch (u.format3, std::forward<Ts> (ds)...) : c->default_return_value ());
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142 #endif
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143 default: return_trace (c->default_return_value ());
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144 }
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145 }
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146
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147 bool sanitize (hb_sanitize_context_t *c) const
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148 {
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149 TRACE_SANITIZE (this);
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150 if (unlikely (!u.header.sanitize (c) ||
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151 u.header.length < u.header.min_size ||
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152 !c->check_range (this, u.header.length))) return_trace (false);
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153
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154 return_trace (dispatch (c));
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155 }
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156
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157 public:
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diff changeset
158 union {
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159 KernSubTableHeader header;
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160 AAT::KerxSubTableFormat0<KernSubTableHeader> format0;
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diff changeset
161 AAT::KerxSubTableFormat1<KernSubTableHeader> format1;
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162 AAT::KerxSubTableFormat2<KernSubTableHeader> format2;
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163 KernSubTableFormat3<KernSubTableHeader> format3;
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diff changeset
164 } u;
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165 public:
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166 DEFINE_SIZE_MIN (KernSubTableHeader::static_size);
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167 };
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168
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169
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diff changeset
170 struct KernOTSubTableHeader
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171 {
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diff changeset
172 static constexpr bool apple = false;
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173 typedef AAT::ObsoleteTypes Types;
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174
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diff changeset
175 unsigned tuple_count () const { return 0; }
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176 bool is_horizontal () const { return (coverage & Horizontal); }
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177
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178 enum Coverage
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179 {
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180 Horizontal = 0x01u,
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181 Minimum = 0x02u,
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182 CrossStream = 0x04u,
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183 Override = 0x08u,
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184
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185 /* Not supported: */
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diff changeset
186 Backwards = 0x00u,
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187 Variation = 0x00u,
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188 };
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189
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diff changeset
190 bool sanitize (hb_sanitize_context_t *c) const
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diff changeset
191 {
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diff changeset
192 TRACE_SANITIZE (this);
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diff changeset
193 return_trace (c->check_struct (this));
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194 }
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195
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196 public:
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diff changeset
197 HBUINT16 versionZ; /* Unused. */
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198 HBUINT16 length; /* Length of the subtable (including this header). */
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199 HBUINT8 format; /* Subtable format. */
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200 HBUINT8 coverage; /* Coverage bits. */
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201 public:
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202 DEFINE_SIZE_STATIC (6);
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203 };
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204
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diff changeset
205 struct KernOT : AAT::KerxTable<KernOT>
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206 {
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207 friend struct AAT::KerxTable<KernOT>;
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208
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209 static constexpr hb_tag_t tableTag = HB_OT_TAG_kern;
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210 static constexpr unsigned minVersion = 0u;
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211
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212 typedef KernOTSubTableHeader SubTableHeader;
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213 typedef SubTableHeader::Types Types;
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214 typedef KernSubTable<SubTableHeader> SubTable;
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215
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216 protected:
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217 HBUINT16 version; /* Version--0x0000u */
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218 HBUINT16 tableCount; /* Number of subtables in the kerning table. */
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219 SubTable firstSubTable; /* Subtables. */
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220 public:
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221 DEFINE_SIZE_MIN (4);
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222 };
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223
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224
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225 struct KernAATSubTableHeader
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226 {
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227 static constexpr bool apple = true;
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228 typedef AAT::ObsoleteTypes Types;
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229
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230 unsigned tuple_count () const { return 0; }
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231 bool is_horizontal () const { return !(coverage & Vertical); }
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232
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233 enum Coverage
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234 {
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235 Vertical = 0x80u,
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236 CrossStream = 0x40u,
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237 Variation = 0x20u,
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238
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239 /* Not supported: */
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240 Backwards = 0x00u,
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241 };
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242
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243 bool sanitize (hb_sanitize_context_t *c) const
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244 {
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245 TRACE_SANITIZE (this);
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246 return_trace (c->check_struct (this));
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247 }
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248
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249 public:
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250 HBUINT32 length; /* Length of the subtable (including this header). */
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251 HBUINT8 coverage; /* Coverage bits. */
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252 HBUINT8 format; /* Subtable format. */
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253 HBUINT16 tupleIndex; /* The tuple index (used for variations fonts).
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254 * This value specifies which tuple this subtable covers.
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255 * Note: We don't implement. */
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256 public:
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257 DEFINE_SIZE_STATIC (8);
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258 };
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259
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diff changeset
260 struct KernAAT : AAT::KerxTable<KernAAT>
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261 {
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262 friend struct AAT::KerxTable<KernAAT>;
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263
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diff changeset
264 static constexpr hb_tag_t tableTag = HB_OT_TAG_kern;
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265 static constexpr unsigned minVersion = 0x00010000u;
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266
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267 typedef KernAATSubTableHeader SubTableHeader;
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268 typedef SubTableHeader::Types Types;
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269 typedef KernSubTable<SubTableHeader> SubTable;
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270
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271 protected:
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272 HBUINT32 version; /* Version--0x00010000u */
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273 HBUINT32 tableCount; /* Number of subtables in the kerning table. */
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274 SubTable firstSubTable; /* Subtables. */
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275 public:
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276 DEFINE_SIZE_MIN (8);
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277 };
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278
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diff changeset
279 struct kern
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280 {
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281 static constexpr hb_tag_t tableTag = HB_OT_TAG_kern;
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282
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diff changeset
283 bool has_data () const { return u.version32; }
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diff changeset
284 unsigned get_type () const { return u.major; }
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285
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diff changeset
286 bool has_state_machine () const
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287 {
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diff changeset
288 switch (get_type ()) {
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289 case 0: return u.ot.has_state_machine ();
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290 #ifndef HB_NO_AAT_SHAPE
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291 case 1: return u.aat.has_state_machine ();
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diff changeset
292 #endif
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293 default:return false;
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294 }
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295 }
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296
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diff changeset
297 bool has_cross_stream () const
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diff changeset
298 {
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diff changeset
299 switch (get_type ()) {
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300 case 0: return u.ot.has_cross_stream ();
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diff changeset
301 #ifndef HB_NO_AAT_SHAPE
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302 case 1: return u.aat.has_cross_stream ();
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303 #endif
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304 default:return false;
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305 }
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306 }
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307
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308 int get_h_kerning (hb_codepoint_t left, hb_codepoint_t right) const
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309 {
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310 switch (get_type ()) {
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311 case 0: return u.ot.get_h_kerning (left, right);
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312 #ifndef HB_NO_AAT_SHAPE
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313 case 1: return u.aat.get_h_kerning (left, right);
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314 #endif
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315 default:return 0;
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316 }
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317 }
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318
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319 bool apply (AAT::hb_aat_apply_context_t *c) const
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320 { return dispatch (c); }
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321
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322 template <typename context_t, typename ...Ts>
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323 typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
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324 {
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325 unsigned int subtable_type = get_type ();
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326 TRACE_DISPATCH (this, subtable_type);
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327 switch (subtable_type) {
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328 case 0: return_trace (c->dispatch (u.ot, std::forward<Ts> (ds)...));
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329 #ifndef HB_NO_AAT_SHAPE
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330 case 1: return_trace (c->dispatch (u.aat, std::forward<Ts> (ds)...));
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331 #endif
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332 default: return_trace (c->default_return_value ());
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333 }
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334 }
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335
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336 bool sanitize (hb_sanitize_context_t *c) const
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337 {
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338 TRACE_SANITIZE (this);
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339 if (!u.version32.sanitize (c)) return_trace (false);
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340 return_trace (dispatch (c));
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341 }
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342
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343 protected:
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344 union {
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345 HBUINT32 version32;
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346 HBUINT16 major;
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347 KernOT ot;
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348 #ifndef HB_NO_AAT_SHAPE
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349 KernAAT aat;
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350 #endif
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351 } u;
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352 public:
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353 DEFINE_SIZE_UNION (4, version32);
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354 };
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355
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356 } /* namespace OT */
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357
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358
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359 #endif /* HB_OT_KERN_TABLE_HH */