Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/util/hb-fc.cc @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2
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1 /*
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2 * Copyright © 2014 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 #include <stdlib.h>
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28 #include <stdio.h>
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29
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30 #include "hb-fc.h"
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32 static hb_bool_t
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33 hb_fc_get_glyph (hb_font_t *font /*HB_UNUSED*/,
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34 void *font_data,
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35 hb_codepoint_t unicode,
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36 hb_codepoint_t variation_selector,
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37 hb_codepoint_t *glyph,
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38 void *user_data /*HB_UNUSED*/)
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39
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40 {
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41 FcCharSet *cs = (FcCharSet *) font_data;
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42
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43 if (variation_selector)
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44 {
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45 /* Fontconfig doesn't cache cmap-14 info. However:
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46 * 1. If the font maps the variation_selector, assume it's
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47 * supported,
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48 * 2. If the font doesn't map it, still say it's supported,
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49 * but return 0. This way, the caller will see the zero
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50 * and reject. If we return unsupported here, then the
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51 * variation selector will be hidden and ignored.
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52 */
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53 if (FcCharSetHasChar (cs, unicode) &&
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54 FcCharSetHasChar (cs, variation_selector))
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55 {
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56 unsigned int var_num = 0;
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57 if (variation_selector - 0xFE00u < 16)
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58 var_num = variation_selector - 0xFE00 + 1;
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59 else if (variation_selector - 0xE0100u < (256 - 16))
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60 var_num = variation_selector - 0xE0100 + 17;
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61 *glyph = (var_num << 21) | unicode;
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62 }
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63 else
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64 {
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65 *glyph = 0;
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66 }
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67 return true;
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68 }
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69
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70 *glyph = FcCharSetHasChar (cs, unicode) ? unicode : 0;
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71 return *glyph != 0;
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72 }
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73
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74 static hb_font_funcs_t *
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75 _hb_fc_get_font_funcs ()
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76 {
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77 static const hb_font_funcs_t *fc_ffuncs;
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78
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79 const hb_font_funcs_t *ffuncs;
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80
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81 if (!(ffuncs = fc_ffuncs))
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82 {
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83 hb_font_funcs_t *newfuncs = hb_font_funcs_create ();
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84
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85 hb_font_funcs_set_glyph_func (newfuncs, hb_fc_get_glyph, nullptr, nullptr);
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86
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87 /* XXX MT-unsafe */
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88 if (fc_ffuncs)
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89 hb_font_funcs_destroy (newfuncs);
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90 else
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91 fc_ffuncs = ffuncs = newfuncs;
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92 }
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93
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94 return const_cast<hb_font_funcs_t *> (fc_ffuncs);
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95 }
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96
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97
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98 hb_font_t *
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99 hb_fc_font_create (FcPattern *fcfont)
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100 {
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101 static hb_face_t *face;
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102 hb_font_t *font;
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103
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104 FcCharSet *cs;
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105 if (FcResultMatch != FcPatternGetCharSet (fcfont, FC_CHARSET, 0, &cs))
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106 return hb_font_get_empty ();
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107
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108 if (!face) /* XXX MT-unsafe */
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109 face = hb_face_create (hb_blob_get_empty (), 0);
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110
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111 font = hb_font_create (face);
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112
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113 hb_font_set_funcs (font,
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114 _hb_fc_get_font_funcs (),
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115 FcCharSetCopy (cs),
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116 (hb_destroy_func_t) FcCharSetDestroy);
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117
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118 return font;
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119 }
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120
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121 hb_bool_t
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122 hb_fc_can_render (hb_font_t *font, const char *text)
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123 {
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124 static const char *ot[] = {"ot", nullptr};
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125
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126 hb_buffer_t *buffer = hb_buffer_create ();
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127 hb_buffer_add_utf8 (buffer, text, -1, 0, -1);
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128
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129 /* XXX Do we need this? I think Arabic and Hangul shapers are the
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130 * only one that make any use of this. The Hangul case is not really
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131 * needed, and for Arabic we'll miss a very narrow set of fonts.
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132 * Might be better to force generic shaper perhaps. */
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133 hb_buffer_guess_segment_properties (buffer);
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134
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135 if (!hb_shape_full (font, buffer, nullptr, 0, ot))
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136 abort (); /* hb-ot shaper not enabled? */
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137
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138 unsigned int len;
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139 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &len);
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140 for (unsigned int i = 0; i < len; i++)
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141 {
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142 if (!info[i].codepoint)
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143 {
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144 return false;
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145 }
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146 }
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147
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148 return true;
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149 }