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comparison mupdf-source/thirdparty/harfbuzz/src/hb-shape.cc @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*
2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2012 Google, Inc.
4 *
5 * This is part of HarfBuzz, a text shaping library.
6 *
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
12 *
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 * DAMAGE.
18 *
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 *
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
27 */
28
29 #include "hb.hh"
30
31 #include "hb-shaper.hh"
32 #include "hb-shape-plan.hh"
33 #include "hb-buffer.hh"
34 #include "hb-font.hh"
35 #include "hb-machinery.hh"
36
37
38 #ifndef HB_NO_SHAPER
39
40 /**
41 * SECTION:hb-shape
42 * @title: hb-shape
43 * @short_description: Conversion of text strings into positioned glyphs
44 * @include: hb.h
45 *
46 * Shaping is the central operation of HarfBuzz. Shaping operates on buffers,
47 * which are sequences of Unicode characters that use the same font and have
48 * the same text direction, script, and language. After shaping the buffer
49 * contains the output glyphs and their positions.
50 **/
51
52
53 static inline void free_static_shaper_list ();
54
55 static const char * const nil_shaper_list[] = {nullptr};
56
57 static struct hb_shaper_list_lazy_loader_t : hb_lazy_loader_t<const char *,
58 hb_shaper_list_lazy_loader_t>
59 {
60 static const char ** create ()
61 {
62 const char **shaper_list = (const char **) hb_calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *));
63 if (unlikely (!shaper_list))
64 return nullptr;
65
66 const hb_shaper_entry_t *shapers = _hb_shapers_get ();
67 unsigned int i;
68 for (i = 0; i < HB_SHAPERS_COUNT; i++)
69 shaper_list[i] = shapers[i].name;
70 shaper_list[i] = nullptr;
71
72 hb_atexit (free_static_shaper_list);
73
74 return shaper_list;
75 }
76 static void destroy (const char **l)
77 { hb_free (l); }
78 static const char * const * get_null ()
79 { return nil_shaper_list; }
80 } static_shaper_list;
81
82 static inline
83 void free_static_shaper_list ()
84 {
85 static_shaper_list.free_instance ();
86 }
87
88
89 /**
90 * hb_shape_list_shapers:
91 *
92 * Retrieves the list of shapers supported by HarfBuzz.
93 *
94 * Return value: (transfer none) (array zero-terminated=1): an array of
95 * constant strings
96 *
97 * Since: 0.9.2
98 **/
99 const char **
100 hb_shape_list_shapers ()
101 {
102 return static_shaper_list.get_unconst ();
103 }
104
105
106 /**
107 * hb_shape_full:
108 * @font: an #hb_font_t to use for shaping
109 * @buffer: an #hb_buffer_t to shape
110 * @features: (array length=num_features) (nullable): an array of user
111 * specified #hb_feature_t or `NULL`
112 * @num_features: the length of @features array
113 * @shaper_list: (array zero-terminated=1) (nullable): a `NULL`-terminated
114 * array of shapers to use or `NULL`
115 *
116 * See hb_shape() for details. If @shaper_list is not `NULL`, the specified
117 * shapers will be used in the given order, otherwise the default shapers list
118 * will be used.
119 *
120 * Return value: false if all shapers failed, true otherwise
121 *
122 * Since: 0.9.2
123 **/
124 hb_bool_t
125 hb_shape_full (hb_font_t *font,
126 hb_buffer_t *buffer,
127 const hb_feature_t *features,
128 unsigned int num_features,
129 const char * const *shaper_list)
130 {
131 if (unlikely (!buffer->len))
132 return true;
133
134 buffer->enter ();
135
136 hb_buffer_t *text_buffer = nullptr;
137 if (buffer->flags & HB_BUFFER_FLAG_VERIFY)
138 {
139 text_buffer = hb_buffer_create ();
140 hb_buffer_append (text_buffer, buffer, 0, -1);
141 }
142
143 hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached2 (font->face, &buffer->props,
144 features, num_features,
145 font->coords, font->num_coords,
146 shaper_list);
147
148 hb_bool_t res = hb_shape_plan_execute (shape_plan, font, buffer, features, num_features);
149
150 if (buffer->max_ops <= 0)
151 buffer->shaping_failed = true;
152
153 hb_shape_plan_destroy (shape_plan);
154
155 if (text_buffer)
156 {
157 if (res && buffer->successful && !buffer->shaping_failed
158 && text_buffer->successful
159 && !buffer->verify (text_buffer,
160 font,
161 features,
162 num_features,
163 shaper_list))
164 res = false;
165 hb_buffer_destroy (text_buffer);
166 }
167
168 buffer->leave ();
169
170 return res;
171 }
172
173 /**
174 * hb_shape:
175 * @font: an #hb_font_t to use for shaping
176 * @buffer: an #hb_buffer_t to shape
177 * @features: (array length=num_features) (nullable): an array of user
178 * specified #hb_feature_t or `NULL`
179 * @num_features: the length of @features array
180 *
181 * Shapes @buffer using @font turning its Unicode characters content to
182 * positioned glyphs. If @features is not `NULL`, it will be used to control the
183 * features applied during shaping. If two @features have the same tag but
184 * overlapping ranges the value of the feature with the higher index takes
185 * precedence.
186 *
187 * Since: 0.9.2
188 **/
189 void
190 hb_shape (hb_font_t *font,
191 hb_buffer_t *buffer,
192 const hb_feature_t *features,
193 unsigned int num_features)
194 {
195 hb_shape_full (font, buffer, features, num_features, nullptr);
196 }
197
198
199 #endif