Mercurial > hgrepos > Python2 > PyMuPDF

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

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>>>>> 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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright © 2018 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): Garret Rieger
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25 */
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27 #ifndef HB_OT_HDMX_TABLE_HH
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28 #define HB_OT_HDMX_TABLE_HH
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30 #include "hb-open-type.hh"
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32 /*
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33 * hdmx -- Horizontal Device Metrics
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34 * https://docs.microsoft.com/en-us/typography/opentype/spec/hdmx
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35 */
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36 #define HB_OT_TAG_hdmx HB_TAG('h','d','m','x')
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39 namespace OT {
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42 struct DeviceRecord
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43 {
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44 static unsigned int get_size (unsigned count)
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45 { return hb_ceil_to_4 (min_size + count * HBUINT8::static_size); }
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47 template<typename Iterator,
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48 hb_requires (hb_is_iterator (Iterator))>
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49 bool serialize (hb_serialize_context_t *c, unsigned pixelSize, Iterator it)
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50 {
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51 TRACE_SERIALIZE (this);
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52
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53 unsigned length = it.len ();
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54
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55 if (unlikely (!c->extend (this, length))) return_trace (false);
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57 this->pixelSize = pixelSize;
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58 this->maxWidth =
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59 + it
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60 | hb_reduce (hb_max, 0u);
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61
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62 + it
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63 | hb_sink (widthsZ.as_array (length));
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65 return_trace (true);
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66 }
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68 bool sanitize (hb_sanitize_context_t *c, unsigned sizeDeviceRecord) const
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69 {
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70 TRACE_SANITIZE (this);
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71 return_trace (likely (c->check_struct (this) &&
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72 c->check_range (this, sizeDeviceRecord)));
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73 }
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74
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75 HBUINT8 pixelSize; /* Pixel size for following widths (as ppem). */
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76 HBUINT8 maxWidth; /* Maximum width. */
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77 UnsizedArrayOf<HBUINT8> widthsZ; /* Array of widths (numGlyphs is from the 'maxp' table). */
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78 public:
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79 DEFINE_SIZE_ARRAY (2, widthsZ);
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80 };
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81
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83 struct hdmx
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84 {
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85 static constexpr hb_tag_t tableTag = HB_OT_TAG_hdmx;
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87 unsigned int get_size () const
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88 { return min_size + numRecords * sizeDeviceRecord; }
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90 const DeviceRecord& operator [] (unsigned int i) const
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91 {
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92 /* XXX Null(DeviceRecord) is NOT safe as it's num-glyphs lengthed.
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93 * https://github.com/harfbuzz/harfbuzz/issues/1300 */
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94 if (unlikely (i >= numRecords)) return Null (DeviceRecord);
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95 return StructAtOffset<DeviceRecord> (&this->firstDeviceRecord, i * sizeDeviceRecord);
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96 }
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98 template<typename Iterator,
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99 hb_requires (hb_is_iterator (Iterator))>
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100 bool serialize (hb_serialize_context_t *c, unsigned version, Iterator it)
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101 {
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102 TRACE_SERIALIZE (this);
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103
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104 if (unlikely (!c->extend_min ((*this)))) return_trace (false);
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105
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106 this->version = version;
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107 this->numRecords = it.len ();
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108 this->sizeDeviceRecord = DeviceRecord::get_size (it ? (*it).second.len () : 0);
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109
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110 for (const hb_item_type<Iterator>& _ : +it)
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111 c->start_embed<DeviceRecord> ()->serialize (c, _.first, _.second);
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112
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113 return_trace (c->successful ());
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114 }
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115
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116
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117 bool subset (hb_subset_context_t *c) const
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118 {
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119 TRACE_SUBSET (this);
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120
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121 hdmx *hdmx_prime = c->serializer->start_embed <hdmx> ();
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122 if (unlikely (!hdmx_prime)) return_trace (false);
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123
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124 auto it =
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125 + hb_range ((unsigned) numRecords)
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126 | hb_map ([c, this] (unsigned _)
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127 {
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128 const DeviceRecord *device_record =
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129 &StructAtOffset<DeviceRecord> (&firstDeviceRecord,
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130 _ * sizeDeviceRecord);
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131 auto row =
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132 + hb_range (c->plan->num_output_glyphs ())
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133 | hb_map (c->plan->reverse_glyph_map)
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134 | hb_map ([this, c, device_record] (hb_codepoint_t _)
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135 {
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136 if (c->plan->is_empty_glyph (_))
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137 return Null (HBUINT8);
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138 return device_record->widthsZ.as_array (get_num_glyphs ()) [_];
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139 })
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140 ;
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141 return hb_pair ((unsigned) device_record->pixelSize, +row);
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142 })
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143 ;
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144
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145 hdmx_prime->serialize (c->serializer, version, it);
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146 return_trace (true);
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147 }
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148
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149 unsigned get_num_glyphs () const
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150 {
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151 return sizeDeviceRecord - DeviceRecord::min_size;
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152 }
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153
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154 bool sanitize (hb_sanitize_context_t *c) const
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155 {
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parents:
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156 TRACE_SANITIZE (this);
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parents:
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157 return_trace (c->check_struct (this) &&
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158 !hb_unsigned_mul_overflows (numRecords, sizeDeviceRecord) &&
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159 sizeDeviceRecord >= DeviceRecord::min_size &&
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diff changeset
160 c->check_range (this, get_size ()));
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161 }
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162
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diff changeset
163 protected:
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parents:
diff changeset
164 HBUINT16 version; /* Table version number (0) */
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diff changeset
165 HBUINT16 numRecords; /* Number of device records. */
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parents:
diff changeset
166 HBUINT32 sizeDeviceRecord;
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167 /* Size of a device record, 32-bit aligned. */
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parents:
diff changeset
168 DeviceRecord firstDeviceRecord;
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diff changeset
169 /* Array of device records. */
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170 public:
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parents:
diff changeset
171 DEFINE_SIZE_MIN (8);
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172 };
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173
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parents:
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174 } /* namespace OT */
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175
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176
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diff changeset
177 #endif /* HB_OT_HDMX_TABLE_HH */