af43cab71130abb3977a3d577911dd30453b838f
[platform/upstream/libHarfBuzzSharp.git] / src / hb-glib.cc
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  */
28
29 #include "hb-private.hh"
30
31 #include "hb-glib.h"
32
33 #include "hb-unicode-private.hh"
34
35
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,
86
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,
96
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,
105
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,
113
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,
126
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,
143
144   /* Unicode-6.0 additions */
145   HB_SCRIPT_BATAK,
146   HB_SCRIPT_BRAHMI,
147   HB_SCRIPT_MANDAIC,
148
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
159
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];
168
169   if (unlikely (script == G_UNICODE_SCRIPT_INVALID_CODE))
170     return HB_SCRIPT_INVALID;
171
172   return HB_SCRIPT_UNKNOWN;
173 #endif
174 }
175
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;
186
187   if (unlikely (script == HB_SCRIPT_INVALID))
188     return G_UNICODE_SCRIPT_INVALID_CODE;
189
190   return G_UNICODE_SCRIPT_UNKNOWN;
191 #endif
192 }
193
194
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)
199
200 {
201   return (hb_unicode_combining_class_t) g_unichar_combining_class (unicode);
202 }
203
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 }
211
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)
216
217 {
218   /* hb_unicode_general_category_t and GUnicodeType are identical */
219   return (hb_unicode_general_category_t) g_unichar_type (unicode);
220 }
221
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 }
230
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 }
238
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
249
250   /* We don't ifdef-out the fallback code such that compiler always
251    * sees it and makes sure it's compilable. */
252
253   gchar utf8[12];
254   gchar *normalized;
255   int len;
256   hb_bool_t ret;
257
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;
264
265   if (len == 1) {
266     *ab = g_utf8_get_char (normalized);
267     ret = true;
268   } else {
269     ret = false;
270   }
271
272   g_free (normalized);
273   return ret;
274 }
275
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
286
287   /* We don't ifdef-out the fallback code such that compiler always
288    * sees it and makes sure it's compilable. */
289
290   gchar utf8[6];
291   gchar *normalized;
292   int len;
293   hb_bool_t ret;
294
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;
300
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   }
331
332   g_free (normalized);
333   return ret;
334 }
335
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
345
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;
351
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);
356
357   assert (utf8_decomposed_len <= HB_UNICODE_MAX_DECOMPOSITION_LEN);
358
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);
361
362   g_free (utf8_decomposed);
363
364   return utf8_decomposed_len;
365 }
366
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,
372
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   };
381
382   return const_cast<hb_unicode_funcs_t *> (&_hb_glib_unicode_funcs);
383 }
384