2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2012 Google, Inc.
5 * This is part of HarfBuzz, a text shaping library.
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.
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
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.
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
31 #include "hb-shaper.hh"
32 #include "hb-shape-plan.hh"
33 #include "hb-buffer.hh"
35 #include "hb-machinery.hh"
41 * @short_description: Conversion of text strings into positioned glyphs
44 * Shaping is the central operation of HarfBuzz. Shaping operates on buffers,
45 * which are sequences of Unicode characters that use the same font and have
46 * the same text direction, script, and language. After shaping the buffer
47 * contains the output glyphs and their positions.
51 static inline void free_static_shaper_list ();
53 static const char *nil_shaper_list[] = {nullptr};
55 static struct hb_shaper_list_lazy_loader_t : hb_lazy_loader_t<const char *,
56 hb_shaper_list_lazy_loader_t>
58 static const char ** create ()
60 const char **shaper_list = (const char **) hb_calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *));
61 if (unlikely (!shaper_list))
64 const hb_shaper_entry_t *shapers = _hb_shapers_get ();
66 for (i = 0; i < HB_SHAPERS_COUNT; i++)
67 shaper_list[i] = shapers[i].name;
68 shaper_list[i] = nullptr;
70 hb_atexit (free_static_shaper_list);
74 static void destroy (const char **l)
76 static const char ** get_null ()
77 { return nil_shaper_list; }
81 void free_static_shaper_list ()
83 static_shaper_list.free_instance ();
88 * hb_shape_list_shapers:
90 * Retrieves the list of shapers supported by HarfBuzz.
92 * Return value: (transfer none) (array zero-terminated=1): an array of
98 hb_shape_list_shapers ()
100 return static_shaper_list.get_unconst ();
106 * @font: an #hb_font_t to use for shaping
107 * @buffer: an #hb_buffer_t to shape
108 * @features: (array length=num_features) (nullable): an array of user
109 * specified #hb_feature_t or %NULL
110 * @num_features: the length of @features array
111 * @shaper_list: (array zero-terminated=1) (nullable): a %NULL-terminated
112 * array of shapers to use or %NULL
114 * See hb_shape() for details. If @shaper_list is not %NULL, the specified
115 * shapers will be used in the given order, otherwise the default shapers list
118 * Return value: false if all shapers failed, true otherwise
123 hb_shape_full (hb_font_t *font,
125 const hb_feature_t *features,
126 unsigned int num_features,
127 const char * const *shaper_list)
129 hb_buffer_t *text_buffer = nullptr;
130 if (buffer->flags & HB_BUFFER_FLAG_VERIFY)
132 text_buffer = hb_buffer_create ();
133 hb_buffer_append (text_buffer, buffer, 0, -1);
136 hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached2 (font->face, &buffer->props,
137 features, num_features,
138 font->coords, font->num_coords,
140 hb_bool_t res = hb_shape_plan_execute (shape_plan, font, buffer, features, num_features);
141 hb_shape_plan_destroy (shape_plan);
145 if (res && !buffer->verify (text_buffer,
151 hb_buffer_destroy (text_buffer);
159 * @font: an #hb_font_t to use for shaping
160 * @buffer: an #hb_buffer_t to shape
161 * @features: (array length=num_features) (nullable): an array of user
162 * specified #hb_feature_t or %NULL
163 * @num_features: the length of @features array
165 * Shapes @buffer using @font turning its Unicode characters content to
166 * positioned glyphs. If @features is not %NULL, it will be used to control the
167 * features applied during shaping. If two @features have the same tag but
168 * overlapping ranges the value of the feature with the higher index takes
174 hb_shape (hb_font_t *font,
176 const hb_feature_t *features,
177 unsigned int num_features)
179 hb_shape_full (font, buffer, features, num_features, nullptr);