2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2011 Codethink Limited
4 * Copyright © 2010,2011 Google, Inc.
6 * This is part of HarfBuzz, a text shaping library.
8 * Permission is hereby granted, without written agreement and without
9 * license or royalty fees, to use, copy, modify, and distribute this
10 * software and its documentation for any purpose, provided that the
11 * above copyright notice and the following two paragraphs appear in
12 * all copies of this software.
14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
26 * Red Hat Author(s): Behdad Esfahbod
27 * Codethink Author(s): Ryan Lortie
28 * Google Author(s): Behdad Esfahbod
31 #include "hb-private.hh"
33 #include "hb-unicode-private.hh"
43 hb_unicode_combining_class_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
44 hb_codepoint_t unicode HB_UNUSED,
45 void *user_data HB_UNUSED)
51 hb_unicode_eastasian_width_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
52 hb_codepoint_t unicode HB_UNUSED,
53 void *user_data HB_UNUSED)
58 static hb_unicode_general_category_t
59 hb_unicode_general_category_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
60 hb_codepoint_t unicode HB_UNUSED,
61 void *user_data HB_UNUSED)
63 return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER;
67 hb_unicode_mirroring_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
68 hb_codepoint_t unicode HB_UNUSED,
69 void *user_data HB_UNUSED)
75 hb_unicode_script_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
76 hb_codepoint_t unicode HB_UNUSED,
77 void *user_data HB_UNUSED)
79 return HB_SCRIPT_UNKNOWN;
83 hb_unicode_compose_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
84 hb_codepoint_t a HB_UNUSED,
85 hb_codepoint_t b HB_UNUSED,
86 hb_codepoint_t *ab HB_UNUSED,
87 void *user_data HB_UNUSED)
89 /* TODO handle Hangul jamo here? */
94 hb_unicode_decompose_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
95 hb_codepoint_t ab HB_UNUSED,
96 hb_codepoint_t *a HB_UNUSED,
97 hb_codepoint_t *b HB_UNUSED,
98 void *user_data HB_UNUSED)
100 /* TODO handle Hangul jamo here? */
105 hb_unicode_funcs_t _hb_unicode_funcs_nil = {
106 HB_OBJECT_HEADER_STATIC,
109 TRUE, /* immutable */
111 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_nil,
112 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
113 #undef HB_UNICODE_FUNC_IMPLEMENT
119 hb_unicode_funcs_get_default (void)
121 return &_hb_unicode_funcs_default;
125 hb_unicode_funcs_create (hb_unicode_funcs_t *parent)
127 hb_unicode_funcs_t *ufuncs;
129 if (!(ufuncs = hb_object_create<hb_unicode_funcs_t> ()))
130 return &_hb_unicode_funcs_nil;
133 parent = &_hb_unicode_funcs_nil;
135 hb_unicode_funcs_make_immutable (parent);
136 ufuncs->parent = hb_unicode_funcs_reference (parent);
138 ufuncs->func = parent->func;
140 /* We can safely copy user_data from parent since we hold a reference
141 * onto it and it's immutable. We should not copy the destroy notifiers
143 ufuncs->user_data = parent->user_data;
149 hb_unicode_funcs_get_empty (void)
151 return &_hb_unicode_funcs_nil;
155 hb_unicode_funcs_reference (hb_unicode_funcs_t *ufuncs)
157 return hb_object_reference (ufuncs);
161 hb_unicode_funcs_destroy (hb_unicode_funcs_t *ufuncs)
163 if (!hb_object_destroy (ufuncs)) return;
165 #define HB_UNICODE_FUNC_IMPLEMENT(name) \
166 if (ufuncs->destroy.name) ufuncs->destroy.name (ufuncs->user_data.name);
167 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
168 #undef HB_UNICODE_FUNC_IMPLEMENT
170 hb_unicode_funcs_destroy (ufuncs->parent);
176 hb_unicode_funcs_set_user_data (hb_unicode_funcs_t *ufuncs,
177 hb_user_data_key_t *key,
179 hb_destroy_func_t destroy)
181 return hb_object_set_user_data (ufuncs, key, data, destroy);
185 hb_unicode_funcs_get_user_data (hb_unicode_funcs_t *ufuncs,
186 hb_user_data_key_t *key)
188 return hb_object_get_user_data (ufuncs, key);
193 hb_unicode_funcs_make_immutable (hb_unicode_funcs_t *ufuncs)
195 if (hb_object_is_inert (ufuncs))
198 ufuncs->immutable = TRUE;
202 hb_unicode_funcs_is_immutable (hb_unicode_funcs_t *ufuncs)
204 return ufuncs->immutable;
208 hb_unicode_funcs_get_parent (hb_unicode_funcs_t *ufuncs)
210 return ufuncs->parent ? ufuncs->parent : &_hb_unicode_funcs_nil;
214 #define HB_UNICODE_FUNC_IMPLEMENT(name) \
217 hb_unicode_funcs_set_##name##_func (hb_unicode_funcs_t *ufuncs, \
218 hb_unicode_##name##_func_t func, \
220 hb_destroy_func_t destroy) \
222 if (ufuncs->immutable) \
225 if (ufuncs->destroy.name) \
226 ufuncs->destroy.name (ufuncs->user_data.name); \
229 ufuncs->func.name = func; \
230 ufuncs->user_data.name = user_data; \
231 ufuncs->destroy.name = destroy; \
233 ufuncs->func.name = ufuncs->parent->func.name; \
234 ufuncs->user_data.name = ufuncs->parent->user_data.name; \
235 ufuncs->destroy.name = NULL; \
239 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
240 #undef HB_UNICODE_FUNC_IMPLEMENT
243 #define HB_UNICODE_FUNC_IMPLEMENT(return_type, name) \
246 hb_unicode_##name (hb_unicode_funcs_t *ufuncs, \
247 hb_codepoint_t unicode) \
249 return ufuncs->func.name (ufuncs, unicode, ufuncs->user_data.name); \
251 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE
252 #undef HB_UNICODE_FUNC_IMPLEMENT
255 hb_unicode_compose (hb_unicode_funcs_t *ufuncs,
261 return ufuncs->func.compose (ufuncs, a, b, ab, ufuncs->user_data.compose);
265 hb_unicode_decompose (hb_unicode_funcs_t *ufuncs,
271 return ufuncs->func.decompose (ufuncs, ab, a, b, ufuncs->user_data.decompose);