gfx/harfbuzz/src/hb-glib.cc@925c144e1f1f
gfx/harfbuzz/src/hb-glib.cc
Fri, 16 Jan 2015 18:13:44 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Fri, 16 Jan 2015 18:13:44 +0100
- branch
- TOR_BUG_9701
- changeset 14
- 925c144e1f1f
- permissions
- -rw-r--r--
Integrate suggestion from review to improve consistency with existing code.
1 /*
2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2011 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 */
29 #include "hb-private.hh"
31 #include "hb-glib.h"
33 #include "hb-unicode-private.hh"
36 #if !GLIB_CHECK_VERSION(2,29,14)
37 static const hb_script_t
38 glib_script_to_script[] =
39 {
40 HB_SCRIPT_COMMON,
41 HB_SCRIPT_INHERITED,
42 HB_SCRIPT_ARABIC,
43 HB_SCRIPT_ARMENIAN,
44 HB_SCRIPT_BENGALI,
45 HB_SCRIPT_BOPOMOFO,
46 HB_SCRIPT_CHEROKEE,
47 HB_SCRIPT_COPTIC,
48 HB_SCRIPT_CYRILLIC,
49 HB_SCRIPT_DESERET,
50 HB_SCRIPT_DEVANAGARI,
51 HB_SCRIPT_ETHIOPIC,
52 HB_SCRIPT_GEORGIAN,
53 HB_SCRIPT_GOTHIC,
54 HB_SCRIPT_GREEK,
55 HB_SCRIPT_GUJARATI,
56 HB_SCRIPT_GURMUKHI,
57 HB_SCRIPT_HAN,
58 HB_SCRIPT_HANGUL,
59 HB_SCRIPT_HEBREW,
60 HB_SCRIPT_HIRAGANA,
61 HB_SCRIPT_KANNADA,
62 HB_SCRIPT_KATAKANA,
63 HB_SCRIPT_KHMER,
64 HB_SCRIPT_LAO,
65 HB_SCRIPT_LATIN,
66 HB_SCRIPT_MALAYALAM,
67 HB_SCRIPT_MONGOLIAN,
68 HB_SCRIPT_MYANMAR,
69 HB_SCRIPT_OGHAM,
70 HB_SCRIPT_OLD_ITALIC,
71 HB_SCRIPT_ORIYA,
72 HB_SCRIPT_RUNIC,
73 HB_SCRIPT_SINHALA,
74 HB_SCRIPT_SYRIAC,
75 HB_SCRIPT_TAMIL,
76 HB_SCRIPT_TELUGU,
77 HB_SCRIPT_THAANA,
78 HB_SCRIPT_THAI,
79 HB_SCRIPT_TIBETAN,
80 HB_SCRIPT_CANADIAN_SYLLABICS,
81 HB_SCRIPT_YI,
82 HB_SCRIPT_TAGALOG,
83 HB_SCRIPT_HANUNOO,
84 HB_SCRIPT_BUHID,
85 HB_SCRIPT_TAGBANWA,
87 /* Unicode-4.0 additions */
88 HB_SCRIPT_BRAILLE,
89 HB_SCRIPT_CYPRIOT,
90 HB_SCRIPT_LIMBU,
91 HB_SCRIPT_OSMANYA,
92 HB_SCRIPT_SHAVIAN,
93 HB_SCRIPT_LINEAR_B,
94 HB_SCRIPT_TAI_LE,
95 HB_SCRIPT_UGARITIC,
97 /* Unicode-4.1 additions */
98 HB_SCRIPT_NEW_TAI_LUE,
99 HB_SCRIPT_BUGINESE,
100 HB_SCRIPT_GLAGOLITIC,
101 HB_SCRIPT_TIFINAGH,
102 HB_SCRIPT_SYLOTI_NAGRI,
103 HB_SCRIPT_OLD_PERSIAN,
104 HB_SCRIPT_KHAROSHTHI,
106 /* Unicode-5.0 additions */
107 HB_SCRIPT_UNKNOWN,
108 HB_SCRIPT_BALINESE,
109 HB_SCRIPT_CUNEIFORM,
110 HB_SCRIPT_PHOENICIAN,
111 HB_SCRIPT_PHAGS_PA,
112 HB_SCRIPT_NKO,
114 /* Unicode-5.1 additions */
115 HB_SCRIPT_KAYAH_LI,
116 HB_SCRIPT_LEPCHA,
117 HB_SCRIPT_REJANG,
118 HB_SCRIPT_SUNDANESE,
119 HB_SCRIPT_SAURASHTRA,
120 HB_SCRIPT_CHAM,
121 HB_SCRIPT_OL_CHIKI,
122 HB_SCRIPT_VAI,
123 HB_SCRIPT_CARIAN,
124 HB_SCRIPT_LYCIAN,
125 HB_SCRIPT_LYDIAN,
127 /* Unicode-5.2 additions */
128 HB_SCRIPT_AVESTAN,
129 HB_SCRIPT_BAMUM,
130 HB_SCRIPT_EGYPTIAN_HIEROGLYPHS,
131 HB_SCRIPT_IMPERIAL_ARAMAIC,
132 HB_SCRIPT_INSCRIPTIONAL_PAHLAVI,
133 HB_SCRIPT_INSCRIPTIONAL_PARTHIAN,
134 HB_SCRIPT_JAVANESE,
135 HB_SCRIPT_KAITHI,
136 HB_SCRIPT_TAI_THAM,
137 HB_SCRIPT_LISU,
138 HB_SCRIPT_MEETEI_MAYEK,
139 HB_SCRIPT_OLD_SOUTH_ARABIAN,
140 HB_SCRIPT_OLD_TURKIC,
141 HB_SCRIPT_SAMARITAN,
142 HB_SCRIPT_TAI_VIET,
144 /* Unicode-6.0 additions */
145 HB_SCRIPT_BATAK,
146 HB_SCRIPT_BRAHMI,
147 HB_SCRIPT_MANDAIC,
149 /* Unicode-6.1 additions */
150 HB_SCRIPT_CHAKMA,
151 HB_SCRIPT_MEROITIC_CURSIVE,
152 HB_SCRIPT_MEROITIC_HIEROGLYPHS,
153 HB_SCRIPT_MIAO,
154 HB_SCRIPT_SHARADA,
155 HB_SCRIPT_SORA_SOMPENG,
156 HB_SCRIPT_TAKRI
157 };
158 #endif
160 hb_script_t
161 hb_glib_script_to_script (GUnicodeScript script)
162 {
163 #if GLIB_CHECK_VERSION(2,29,14)
164 return (hb_script_t) g_unicode_script_to_iso15924 (script);
165 #else
166 if (likely ((unsigned int) script < ARRAY_LENGTH (glib_script_to_script)))
167 return glib_script_to_script[script];
169 if (unlikely (script == G_UNICODE_SCRIPT_INVALID_CODE))
170 return HB_SCRIPT_INVALID;
172 return HB_SCRIPT_UNKNOWN;
173 #endif
174 }
176 GUnicodeScript
177 hb_glib_script_from_script (hb_script_t script)
178 {
179 #if GLIB_CHECK_VERSION(2,29,14)
180 return g_unicode_script_from_iso15924 (script);
181 #else
182 unsigned int count = ARRAY_LENGTH (glib_script_to_script);
183 for (unsigned int i = 0; i < count; i++)
184 if (glib_script_to_script[i] == script)
185 return (GUnicodeScript) i;
187 if (unlikely (script == HB_SCRIPT_INVALID))
188 return G_UNICODE_SCRIPT_INVALID_CODE;
190 return G_UNICODE_SCRIPT_UNKNOWN;
191 #endif
192 }
195 static hb_unicode_combining_class_t
196 hb_glib_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
197 hb_codepoint_t unicode,
198 void *user_data HB_UNUSED)
200 {
201 return (hb_unicode_combining_class_t) g_unichar_combining_class (unicode);
202 }
204 static unsigned int
205 hb_glib_unicode_eastasian_width (hb_unicode_funcs_t *ufuncs HB_UNUSED,
206 hb_codepoint_t unicode,
207 void *user_data HB_UNUSED)
208 {
209 return g_unichar_iswide (unicode) ? 2 : 1;
210 }
212 static hb_unicode_general_category_t
213 hb_glib_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED,
214 hb_codepoint_t unicode,
215 void *user_data HB_UNUSED)
217 {
218 /* hb_unicode_general_category_t and GUnicodeType are identical */
219 return (hb_unicode_general_category_t) g_unichar_type (unicode);
220 }
222 static hb_codepoint_t
223 hb_glib_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED,
224 hb_codepoint_t unicode,
225 void *user_data HB_UNUSED)
226 {
227 g_unichar_get_mirror_char (unicode, &unicode);
228 return unicode;
229 }
231 static hb_script_t
232 hb_glib_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
233 hb_codepoint_t unicode,
234 void *user_data HB_UNUSED)
235 {
236 return hb_glib_script_to_script (g_unichar_get_script (unicode));
237 }
239 static hb_bool_t
240 hb_glib_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
241 hb_codepoint_t a,
242 hb_codepoint_t b,
243 hb_codepoint_t *ab,
244 void *user_data HB_UNUSED)
245 {
246 #if GLIB_CHECK_VERSION(2,29,12)
247 return g_unichar_compose (a, b, ab);
248 #endif
250 /* We don't ifdef-out the fallback code such that compiler always
251 * sees it and makes sure it's compilable. */
253 gchar utf8[12];
254 gchar *normalized;
255 int len;
256 hb_bool_t ret;
258 len = g_unichar_to_utf8 (a, utf8);
259 len += g_unichar_to_utf8 (b, utf8 + len);
260 normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFC);
261 len = g_utf8_strlen (normalized, -1);
262 if (unlikely (!len))
263 return false;
265 if (len == 1) {
266 *ab = g_utf8_get_char (normalized);
267 ret = true;
268 } else {
269 ret = false;
270 }
272 g_free (normalized);
273 return ret;
274 }
276 static hb_bool_t
277 hb_glib_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
278 hb_codepoint_t ab,
279 hb_codepoint_t *a,
280 hb_codepoint_t *b,
281 void *user_data HB_UNUSED)
282 {
283 #if GLIB_CHECK_VERSION(2,29,12)
284 return g_unichar_decompose (ab, a, b);
285 #endif
287 /* We don't ifdef-out the fallback code such that compiler always
288 * sees it and makes sure it's compilable. */
290 gchar utf8[6];
291 gchar *normalized;
292 int len;
293 hb_bool_t ret;
295 len = g_unichar_to_utf8 (ab, utf8);
296 normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFD);
297 len = g_utf8_strlen (normalized, -1);
298 if (unlikely (!len))
299 return false;
301 if (len == 1) {
302 *a = g_utf8_get_char (normalized);
303 *b = 0;
304 ret = *a != ab;
305 } else if (len == 2) {
306 *a = g_utf8_get_char (normalized);
307 *b = g_utf8_get_char (g_utf8_next_char (normalized));
308 /* Here's the ugly part: if ab decomposes to a single character and
309 * that character decomposes again, we have to detect that and undo
310 * the second part :-(. */
311 gchar *recomposed = g_utf8_normalize (normalized, -1, G_NORMALIZE_NFC);
312 hb_codepoint_t c = g_utf8_get_char (recomposed);
313 if (c != ab && c != *a) {
314 *a = c;
315 *b = 0;
316 }
317 g_free (recomposed);
318 ret = true;
319 } else {
320 /* If decomposed to more than two characters, take the last one,
321 * and recompose the rest to get the first component. */
322 gchar *end = g_utf8_offset_to_pointer (normalized, len - 1);
323 gchar *recomposed;
324 *b = g_utf8_get_char (end);
325 recomposed = g_utf8_normalize (normalized, end - normalized, G_NORMALIZE_NFC);
326 /* We expect that recomposed has exactly one character now. */
327 *a = g_utf8_get_char (recomposed);
328 g_free (recomposed);
329 ret = true;
330 }
332 g_free (normalized);
333 return ret;
334 }
336 static unsigned int
337 hb_glib_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs HB_UNUSED,
338 hb_codepoint_t u,
339 hb_codepoint_t *decomposed,
340 void *user_data HB_UNUSED)
341 {
342 #if GLIB_CHECK_VERSION(2,29,12)
343 return g_unichar_fully_decompose (u, TRUE, decomposed, HB_UNICODE_MAX_DECOMPOSITION_LEN);
344 #endif
346 /* If the user doesn't have GLib >= 2.29.12 we have to perform
347 * a round trip to UTF-8 and the associated memory management dance. */
348 gchar utf8[6];
349 gchar *utf8_decomposed, *c;
350 gsize utf8_len, utf8_decomposed_len, i;
352 /* Convert @u to UTF-8 and normalise it in NFKD mode. This performs the compatibility decomposition. */
353 utf8_len = g_unichar_to_utf8 (u, utf8);
354 utf8_decomposed = g_utf8_normalize (utf8, utf8_len, G_NORMALIZE_NFKD);
355 utf8_decomposed_len = g_utf8_strlen (utf8_decomposed, -1);
357 assert (utf8_decomposed_len <= HB_UNICODE_MAX_DECOMPOSITION_LEN);
359 for (i = 0, c = utf8_decomposed; i < utf8_decomposed_len; i++, c = g_utf8_next_char (c))
360 *decomposed++ = g_utf8_get_char (c);
362 g_free (utf8_decomposed);
364 return utf8_decomposed_len;
365 }
367 hb_unicode_funcs_t *
368 hb_glib_get_unicode_funcs (void)
369 {
370 static const hb_unicode_funcs_t _hb_glib_unicode_funcs = {
371 HB_OBJECT_HEADER_STATIC,
373 NULL, /* parent */
374 true, /* immutable */
375 {
376 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_glib_unicode_##name,
377 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
378 #undef HB_UNICODE_FUNC_IMPLEMENT
379 }
380 };
382 return const_cast<hb_unicode_funcs_t *> (&_hb_glib_unicode_funcs);
383 }
