Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-kern.hh @ 22:d77477b4e151

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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:
rev   line source
2
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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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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26
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27 #ifndef HB_KERN_HH
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28 #define HB_KERN_HH
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29
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30 #include "hb-open-type.hh"
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31 #include "hb-aat-layout-common.hh"
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32 #include "hb-ot-layout-gpos-table.hh"
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33
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34
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35 namespace OT {
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36
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37
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38 template <typename Driver>
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39 struct hb_kern_machine_t
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40 {
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41 hb_kern_machine_t (const Driver &driver_,
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42 bool crossStream_ = false) :
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43 driver (driver_),
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44 crossStream (crossStream_) {}
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45
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46 HB_NO_SANITIZE_SIGNED_INTEGER_OVERFLOW
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47 void kern (hb_font_t *font,
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48 hb_buffer_t *buffer,
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49 hb_mask_t kern_mask,
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50 bool scale = true) const
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51 {
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52 if (!buffer->message (font, "start kern"))
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53 return;
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54
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55 buffer->unsafe_to_concat ();
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56 OT::hb_ot_apply_context_t c (1, font, buffer);
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57 c.set_lookup_mask (kern_mask);
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58 c.set_lookup_props (OT::LookupFlag::IgnoreMarks);
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59 auto &skippy_iter = c.iter_input;
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60
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61 bool horizontal = HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction);
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62 unsigned int count = buffer->len;
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63 hb_glyph_info_t *info = buffer->info;
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64 hb_glyph_position_t *pos = buffer->pos;
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65 for (unsigned int idx = 0; idx < count;)
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66 {
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67 if (!(info[idx].mask & kern_mask))
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68 {
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69 idx++;
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70 continue;
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71 }
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72
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73 skippy_iter.reset (idx, 1);
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74 unsigned unsafe_to;
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75 if (!skippy_iter.next (&unsafe_to))
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76 {
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77 idx++;
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78 continue;
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79 }
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80
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81 unsigned int i = idx;
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82 unsigned int j = skippy_iter.idx;
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83
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84 hb_position_t kern = driver.get_kerning (info[i].codepoint,
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85 info[j].codepoint);
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86
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87
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88 if (likely (!kern))
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89 goto skip;
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90
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91 if (horizontal)
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92 {
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93 if (scale)
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94 kern = font->em_scale_x (kern);
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95 if (crossStream)
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96 {
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97 pos[j].y_offset = kern;
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98 buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
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99 }
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100 else
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101 {
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102 hb_position_t kern1 = kern >> 1;
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parents:
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103 hb_position_t kern2 = kern - kern1;
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parents:
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104 pos[i].x_advance += kern1;
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parents:
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105 pos[j].x_advance += kern2;
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parents:
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106 pos[j].x_offset += kern2;
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parents:
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107 }
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parents:
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108 }
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parents:
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109 else
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parents:
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110 {
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parents:
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111 if (scale)
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parents:
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112 kern = font->em_scale_y (kern);
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113 if (crossStream)
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114 {
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115 pos[j].x_offset = kern;
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116 buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
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117 }
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118 else
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parents:
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119 {
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parents:
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120 hb_position_t kern1 = kern >> 1;
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parents:
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121 hb_position_t kern2 = kern - kern1;
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parents:
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122 pos[i].y_advance += kern1;
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parents:
diff changeset
123 pos[j].y_advance += kern2;
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parents:
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124 pos[j].y_offset += kern2;
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parents:
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125 }
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parents:
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126 }
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parents:
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127
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parents:
diff changeset
128 buffer->unsafe_to_break (i, j + 1);
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parents:
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129
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parents:
diff changeset
130 skip:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
131 idx = skippy_iter.idx;
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parents:
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132 }
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parents:
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133
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parents:
diff changeset
134 (void) buffer->message (font, "end kern");
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parents:
diff changeset
135 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137 const Driver &driver;
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 bool crossStream;
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
139 };
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
140
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
141
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
142 } /* namespace OT */
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parents:
diff changeset
143
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
144
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parents:
diff changeset
145 #endif /* HB_KERN_HH */