Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-aat-layout-trak-table.hh @ 22:d77477b4e151

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Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +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 Ebrahim Byagowi
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3 * Copyright © 2018 Google, Inc.
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4 *
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5 * This is part of HarfBuzz, a text shaping library.
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6 *
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7 * Permission is hereby granted, without written agreement and without
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8 * license or royalty fees, to use, copy, modify, and distribute this
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9 * software and its documentation for any purpose, provided that the
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10 * above copyright notice and the following two paragraphs appear in
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11 * all copies of this software.
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12 *
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13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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17 * DAMAGE.
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18 *
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19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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24 *
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25 * Google Author(s): Behdad Esfahbod
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26 */
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28 #ifndef HB_AAT_LAYOUT_TRAK_TABLE_HH
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29 #define HB_AAT_LAYOUT_TRAK_TABLE_HH
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31 #include "hb-aat-layout-common.hh"
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32 #include "hb-ot-layout.hh"
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33 #include "hb-open-type.hh"
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35 /*
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36 * trak -- Tracking
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37 * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6trak.html
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38 */
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39 #define HB_AAT_TAG_trak HB_TAG('t','r','a','k')
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42 namespace AAT {
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45 struct TrackTableEntry
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46 {
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47 friend struct TrackData;
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49 float get_track_value () const { return track.to_float (); }
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51 int get_value (const void *base, unsigned int index,
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52 unsigned int table_size) const
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53 { return (base+valuesZ).as_array (table_size)[index]; }
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54
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55 public:
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56 bool sanitize (hb_sanitize_context_t *c, const void *base,
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57 unsigned int table_size) const
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58 {
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59 TRACE_SANITIZE (this);
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60 return_trace (likely (c->check_struct (this) &&
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61 (valuesZ.sanitize (c, base, table_size))));
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62 }
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63
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64 protected:
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65 F16DOT16 track; /* Track value for this record. */
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66 NameID trackNameID; /* The 'name' table index for this track.
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67 * (a short word or phrase like "loose"
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68 * or "very tight") */
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69 NNOffset16To<UnsizedArrayOf<FWORD>>
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70 valuesZ; /* Offset from start of tracking table to
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71 * per-size tracking values for this track. */
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72
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73 public:
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74 DEFINE_SIZE_STATIC (8);
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75 };
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77 struct TrackData
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78 {
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79 float interpolate_at (unsigned int idx,
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80 float target_size,
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81 const TrackTableEntry &trackTableEntry,
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82 const void *base) const
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83 {
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84 unsigned int sizes = nSizes;
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85 hb_array_t<const F16DOT16> size_table ((base+sizeTable).arrayZ, sizes);
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86
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87 float s0 = size_table[idx].to_float ();
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88 float s1 = size_table[idx + 1].to_float ();
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89 float t = unlikely (s0 == s1) ? 0.f : (target_size - s0) / (s1 - s0);
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90 return t * trackTableEntry.get_value (base, idx + 1, sizes) +
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91 (1.f - t) * trackTableEntry.get_value (base, idx, sizes);
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92 }
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93
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94 int get_tracking (const void *base, float ptem) const
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95 {
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96 /*
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97 * Choose track.
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98 */
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99 const TrackTableEntry *trackTableEntry = nullptr;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
100 unsigned int count = nTracks;
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parents:
diff changeset
101 for (unsigned int i = 0; i < count; i++)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
102 {
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parents:
diff changeset
103 /* Note: Seems like the track entries are sorted by values. But the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 * spec doesn't explicitly say that. It just mentions it in the example. */
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parents:
diff changeset
105
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 /* For now we only seek for track entries with zero tracking value */
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parents:
diff changeset
107
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parents:
diff changeset
108 if (trackTable[i].get_track_value () == 0.f)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
109 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
110 trackTableEntry = &trackTable[i];
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 break;
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diff changeset
112 }
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113 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
114 if (!trackTableEntry) return 0.;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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115
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parents:
diff changeset
116 /*
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117 * Choose size.
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Franz Glasner <fzglas.hg@dom66.de>
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118 */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
119 unsigned int sizes = nSizes;
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diff changeset
120 if (!sizes) return 0.;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
121 if (sizes == 1) return trackTableEntry->get_value (base, 0, sizes);
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122
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diff changeset
123 hb_array_t<const F16DOT16> size_table ((base+sizeTable).arrayZ, sizes);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
124 unsigned int size_index;
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diff changeset
125 for (size_index = 0; size_index < sizes - 1; size_index++)
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diff changeset
126 if (size_table[size_index].to_float () >= ptem)
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127 break;
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128
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129 return roundf (interpolate_at (size_index ? size_index - 1 : 0, ptem,
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130 *trackTableEntry, base));
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131 }
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132
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diff changeset
133 bool sanitize (hb_sanitize_context_t *c, const void *base) const
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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diff changeset
134 {
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diff changeset
135 TRACE_SANITIZE (this);
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
136 return_trace (likely (c->check_struct (this) &&
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parents:
diff changeset
137 sizeTable.sanitize (c, base, nSizes) &&
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 trackTable.sanitize (c, nTracks, base, nSizes)));
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parents:
diff changeset
139 }
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140
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
141 protected:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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142 HBUINT16 nTracks; /* Number of separate tracks included in this table. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 HBUINT16 nSizes; /* Number of point sizes included in this table. */
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parents:
diff changeset
144 NNOffset32To<UnsizedArrayOf<F16DOT16>>
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
145 sizeTable; /* Offset from start of the tracking table to
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
146 * Array[nSizes] of size values.. */
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parents:
diff changeset
147 UnsizedArrayOf<TrackTableEntry>
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parents:
diff changeset
148 trackTable; /* Array[nTracks] of TrackTableEntry records. */
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149
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diff changeset
150 public:
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parents:
diff changeset
151 DEFINE_SIZE_ARRAY (8, trackTable);
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152 };
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153
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parents:
diff changeset
154 struct trak
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parents:
diff changeset
155 {
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parents:
diff changeset
156 static constexpr hb_tag_t tableTag = HB_AAT_TAG_trak;
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diff changeset
157
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parents:
diff changeset
158 bool has_data () const { return version.to_int (); }
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diff changeset
159
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parents:
diff changeset
160 bool apply (hb_aat_apply_context_t *c) const
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
161 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 TRACE_APPLY (this);
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parents:
diff changeset
163
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 hb_mask_t trak_mask = c->plan->trak_mask;
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diff changeset
165
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parents:
diff changeset
166 const float ptem = c->font->ptem;
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parents:
diff changeset
167 if (unlikely (ptem <= 0.f))
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 return_trace (false);
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parents:
diff changeset
169
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 hb_buffer_t *buffer = c->buffer;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
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parents:
diff changeset
172 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 const TrackData &trackData = this+horizData;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 int tracking = trackData.get_tracking (this, ptem);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 hb_position_t offset_to_add = c->font->em_scalef_x (tracking / 2);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 hb_position_t advance_to_add = c->font->em_scalef_x (tracking);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 foreach_grapheme (buffer, start, end)
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diff changeset
178 {
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parents:
diff changeset
179 if (!(buffer->info[start].mask & trak_mask)) continue;
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parents:
diff changeset
180 buffer->pos[start].x_advance += advance_to_add;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 buffer->pos[start].x_offset += offset_to_add;
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parents:
diff changeset
182 }
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parents:
diff changeset
183 }
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parents:
diff changeset
184 else
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parents:
diff changeset
185 {
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parents:
diff changeset
186 const TrackData &trackData = this+vertData;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 int tracking = trackData.get_tracking (this, ptem);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 hb_position_t offset_to_add = c->font->em_scalef_y (tracking / 2);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 hb_position_t advance_to_add = c->font->em_scalef_y (tracking);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 foreach_grapheme (buffer, start, end)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 if (!(buffer->info[start].mask & trak_mask)) continue;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 buffer->pos[start].y_advance += advance_to_add;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 buffer->pos[start].y_offset += offset_to_add;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 return_trace (true);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
199 }
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200
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201 bool sanitize (hb_sanitize_context_t *c) const
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202 {
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203 TRACE_SANITIZE (this);
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204
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205 return_trace (likely (c->check_struct (this) &&
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206 version.major == 1 &&
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207 horizData.sanitize (c, this, this) &&
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208 vertData.sanitize (c, this, this)));
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209 }
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210
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211 protected:
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212 FixedVersion<>version; /* Version of the tracking table
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213 * (0x00010000u for version 1.0). */
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214 HBUINT16 format; /* Format of the tracking table (set to 0). */
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215 Offset16To<TrackData>
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216 horizData; /* Offset from start of tracking table to TrackData
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217 * for horizontal text (or 0 if none). */
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218 Offset16To<TrackData>
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219 vertData; /* Offset from start of tracking table to TrackData
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220 * for vertical text (or 0 if none). */
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221 HBUINT16 reserved; /* Reserved. Set to 0. */
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222
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223 public:
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224 DEFINE_SIZE_STATIC (12);
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225 };
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226
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227 } /* namespace AAT */
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228
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229
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230 #endif /* HB_AAT_LAYOUT_TRAK_TABLE_HH */