2 * Copyright (C) 2009 Red Hat, Inc.
3 * Copyright © 2011 Codethink Limited
4 * Copyright (C) 2010 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.h"
33 #include "hb-unicode-private.hh"
43 hb_unicode_get_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_get_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_get_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_get_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_get_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_funcs_t _hb_unicode_funcs_nil = {
84 HB_REFERENCE_COUNT_INVALID, /* ref_count */
88 hb_unicode_get_combining_class_nil,
89 hb_unicode_get_eastasian_width_nil,
90 hb_unicode_get_general_category_nil,
91 hb_unicode_get_mirroring_nil,
92 hb_unicode_get_script_nil,
98 hb_unicode_funcs_create (hb_unicode_funcs_t *parent)
100 hb_unicode_funcs_t *ufuncs;
102 if (!HB_OBJECT_DO_CREATE (hb_unicode_funcs_t, ufuncs))
103 return &_hb_unicode_funcs_nil;
107 hb_unicode_funcs_make_immutable (parent);
108 ufuncs->parent = hb_unicode_funcs_reference (parent);
110 ufuncs->get = parent->get;
112 /* We can safely copy user_data from parent since we hold a reference
113 * onto it and it's immutable. We should not copy the destroy notifiers
115 ufuncs->user_data = parent->user_data;
119 ufuncs->get = _hb_unicode_funcs_nil.get;
126 hb_unicode_funcs_reference (hb_unicode_funcs_t *ufuncs)
128 HB_OBJECT_DO_REFERENCE (ufuncs);
132 hb_unicode_funcs_destroy (hb_unicode_funcs_t *ufuncs)
134 HB_OBJECT_DO_DESTROY (ufuncs);
136 #define DESTROY(name) if (ufuncs->destroy.name) ufuncs->destroy.name (ufuncs->user_data.name)
137 DESTROY (combining_class);
138 DESTROY (eastasian_width);
139 DESTROY (general_category);
144 if (ufuncs->parent != NULL)
145 hb_unicode_funcs_destroy (ufuncs->parent);
151 hb_unicode_funcs_make_immutable (hb_unicode_funcs_t *ufuncs)
153 if (HB_OBJECT_IS_INERT (ufuncs))
156 ufuncs->immutable = TRUE;
160 hb_unicode_funcs_is_immutable (hb_unicode_funcs_t *ufuncs)
162 return ufuncs->immutable;
166 hb_unicode_funcs_get_parent (hb_unicode_funcs_t *ufuncs)
168 return ufuncs->parent;
172 #define IMPLEMENT(return_type, name) \
175 hb_unicode_funcs_set_##name##_func (hb_unicode_funcs_t *ufuncs, \
176 hb_unicode_get_##name##_func_t func, \
178 hb_destroy_func_t destroy) \
180 if (ufuncs->immutable) \
183 if (ufuncs->destroy.name) \
184 ufuncs->destroy.name (ufuncs->user_data.name); \
187 ufuncs->get.name = func; \
188 ufuncs->user_data.name = user_data; \
189 ufuncs->destroy.name = destroy; \
190 } else if (ufuncs->parent != NULL) { \
191 ufuncs->get.name = ufuncs->parent->get.name; \
192 ufuncs->user_data.name = ufuncs->parent->user_data.name; \
193 ufuncs->destroy.name = NULL; \
195 ufuncs->get.name = hb_unicode_get_##name##_nil; \
196 ufuncs->user_data.name = NULL; \
197 ufuncs->destroy.name = NULL; \
202 hb_unicode_get_##name (hb_unicode_funcs_t *ufuncs, \
203 hb_codepoint_t unicode) \
205 return ufuncs->get.name (ufuncs, unicode, ufuncs->user_data.name); \
208 IMPLEMENT (unsigned int, combining_class)
209 IMPLEMENT (unsigned int, eastasian_width)
210 IMPLEMENT (hb_unicode_general_category_t, general_category)
211 IMPLEMENT (hb_codepoint_t, mirroring)
212 IMPLEMENT (hb_script_t, script)