1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/harfbuzz/src/hb-common.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,577 @@
1.4 +/*
1.5 + * Copyright © 2009,2010 Red Hat, Inc.
1.6 + * Copyright © 2011,2012 Google, Inc.
1.7 + *
1.8 + * This is part of HarfBuzz, a text shaping library.
1.9 + *
1.10 + * Permission is hereby granted, without written agreement and without
1.11 + * license or royalty fees, to use, copy, modify, and distribute this
1.12 + * software and its documentation for any purpose, provided that the
1.13 + * above copyright notice and the following two paragraphs appear in
1.14 + * all copies of this software.
1.15 + *
1.16 + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
1.17 + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
1.18 + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
1.19 + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
1.20 + * DAMAGE.
1.21 + *
1.22 + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
1.23 + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
1.24 + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
1.25 + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
1.26 + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
1.27 + *
1.28 + * Red Hat Author(s): Behdad Esfahbod
1.29 + * Google Author(s): Behdad Esfahbod
1.30 + */
1.31 +
1.32 +#include "hb-private.hh"
1.33 +
1.34 +#include "hb-mutex-private.hh"
1.35 +#include "hb-object-private.hh"
1.36 +
1.37 +#include <locale.h>
1.38 +
1.39 +
1.40 +/* hb_options_t */
1.41 +
1.42 +hb_options_union_t _hb_options;
1.43 +
1.44 +void
1.45 +_hb_options_init (void)
1.46 +{
1.47 + hb_options_union_t u;
1.48 + u.i = 0;
1.49 + u.opts.initialized = 1;
1.50 +
1.51 + char *c = getenv ("HB_OPTIONS");
1.52 + u.opts.uniscribe_bug_compatible = c && strstr (c, "uniscribe-bug-compatible");
1.53 +
1.54 + /* This is idempotent and threadsafe. */
1.55 + _hb_options = u;
1.56 +}
1.57 +
1.58 +
1.59 +/* hb_tag_t */
1.60 +
1.61 +/**
1.62 + * hb_tag_from_string:
1.63 + * @str: (array length=len):
1.64 + * @len:
1.65 + *
1.66 + *
1.67 + *
1.68 + * Return value:
1.69 + *
1.70 + * Since: 1.0
1.71 + **/
1.72 +hb_tag_t
1.73 +hb_tag_from_string (const char *str, int len)
1.74 +{
1.75 + char tag[4];
1.76 + unsigned int i;
1.77 +
1.78 + if (!str || !len || !*str)
1.79 + return HB_TAG_NONE;
1.80 +
1.81 + if (len < 0 || len > 4)
1.82 + len = 4;
1.83 + for (i = 0; i < (unsigned) len && str[i]; i++)
1.84 + tag[i] = str[i];
1.85 + for (; i < 4; i++)
1.86 + tag[i] = ' ';
1.87 +
1.88 + return HB_TAG_CHAR4 (tag);
1.89 +}
1.90 +
1.91 +/**
1.92 + * hb_tag_to_string:
1.93 + * @tag:
1.94 + * @buf: (array fixed-size=4):
1.95 + *
1.96 + *
1.97 + *
1.98 + * Since: 1.0
1.99 + **/
1.100 +void
1.101 +hb_tag_to_string (hb_tag_t tag, char *buf)
1.102 +{
1.103 + buf[0] = (char) (uint8_t) (tag >> 24);
1.104 + buf[1] = (char) (uint8_t) (tag >> 16);
1.105 + buf[2] = (char) (uint8_t) (tag >> 8);
1.106 + buf[3] = (char) (uint8_t) (tag >> 0);
1.107 +}
1.108 +
1.109 +
1.110 +/* hb_direction_t */
1.111 +
1.112 +const char direction_strings[][4] = {
1.113 + "ltr",
1.114 + "rtl",
1.115 + "ttb",
1.116 + "btt"
1.117 +};
1.118 +
1.119 +/**
1.120 + * hb_direction_from_string:
1.121 + * @str: (array length=len):
1.122 + * @len:
1.123 + *
1.124 + *
1.125 + *
1.126 + * Return value:
1.127 + *
1.128 + * Since: 1.0
1.129 + **/
1.130 +hb_direction_t
1.131 +hb_direction_from_string (const char *str, int len)
1.132 +{
1.133 + if (unlikely (!str || !len || !*str))
1.134 + return HB_DIRECTION_INVALID;
1.135 +
1.136 + /* Lets match loosely: just match the first letter, such that
1.137 + * all of "ltr", "left-to-right", etc work!
1.138 + */
1.139 + char c = TOLOWER (str[0]);
1.140 + for (unsigned int i = 0; i < ARRAY_LENGTH (direction_strings); i++)
1.141 + if (c == direction_strings[i][0])
1.142 + return (hb_direction_t) (HB_DIRECTION_LTR + i);
1.143 +
1.144 + return HB_DIRECTION_INVALID;
1.145 +}
1.146 +
1.147 +/**
1.148 + * hb_direction_to_string:
1.149 + * @direction:
1.150 + *
1.151 + *
1.152 + *
1.153 + * Return value: (transfer none):
1.154 + *
1.155 + * Since: 1.0
1.156 + **/
1.157 +const char *
1.158 +hb_direction_to_string (hb_direction_t direction)
1.159 +{
1.160 + if (likely ((unsigned int) (direction - HB_DIRECTION_LTR)
1.161 + < ARRAY_LENGTH (direction_strings)))
1.162 + return direction_strings[direction - HB_DIRECTION_LTR];
1.163 +
1.164 + return "invalid";
1.165 +}
1.166 +
1.167 +
1.168 +/* hb_language_t */
1.169 +
1.170 +struct hb_language_impl_t {
1.171 + const char s[1];
1.172 +};
1.173 +
1.174 +static const char canon_map[256] = {
1.175 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1.176 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1.177 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '-', 0, 0,
1.178 + '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 0, 0, 0, 0, 0, 0,
1.179 + '-', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
1.180 + 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 0, 0, 0, 0, '-',
1.181 + 0, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
1.182 + 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 0, 0, 0, 0, 0
1.183 +};
1.184 +
1.185 +static hb_bool_t
1.186 +lang_equal (hb_language_t v1,
1.187 + const void *v2)
1.188 +{
1.189 + const unsigned char *p1 = (const unsigned char *) v1;
1.190 + const unsigned char *p2 = (const unsigned char *) v2;
1.191 +
1.192 + while (*p1 && *p1 == canon_map[*p2])
1.193 + p1++, p2++;
1.194 +
1.195 + return *p1 == canon_map[*p2];
1.196 +}
1.197 +
1.198 +#if 0
1.199 +static unsigned int
1.200 +lang_hash (const void *key)
1.201 +{
1.202 + const unsigned char *p = key;
1.203 + unsigned int h = 0;
1.204 + while (canon_map[*p])
1.205 + {
1.206 + h = (h << 5) - h + canon_map[*p];
1.207 + p++;
1.208 + }
1.209 +
1.210 + return h;
1.211 +}
1.212 +#endif
1.213 +
1.214 +
1.215 +struct hb_language_item_t {
1.216 +
1.217 + struct hb_language_item_t *next;
1.218 + hb_language_t lang;
1.219 +
1.220 + inline bool operator == (const char *s) const {
1.221 + return lang_equal (lang, s);
1.222 + }
1.223 +
1.224 + inline hb_language_item_t & operator = (const char *s) {
1.225 + lang = (hb_language_t) strdup (s);
1.226 + for (unsigned char *p = (unsigned char *) lang; *p; p++)
1.227 + *p = canon_map[*p];
1.228 +
1.229 + return *this;
1.230 + }
1.231 +
1.232 + void finish (void) { free ((void *) lang); }
1.233 +};
1.234 +
1.235 +
1.236 +/* Thread-safe lock-free language list */
1.237 +
1.238 +static hb_language_item_t *langs;
1.239 +
1.240 +static inline
1.241 +void free_langs (void)
1.242 +{
1.243 + while (langs) {
1.244 + hb_language_item_t *next = langs->next;
1.245 + langs->finish ();
1.246 + free (langs);
1.247 + langs = next;
1.248 + }
1.249 +}
1.250 +
1.251 +static hb_language_item_t *
1.252 +lang_find_or_insert (const char *key)
1.253 +{
1.254 +retry:
1.255 + hb_language_item_t *first_lang = (hb_language_item_t *) hb_atomic_ptr_get (&langs);
1.256 +
1.257 + for (hb_language_item_t *lang = first_lang; lang; lang = lang->next)
1.258 + if (*lang == key)
1.259 + return lang;
1.260 +
1.261 + /* Not found; allocate one. */
1.262 + hb_language_item_t *lang = (hb_language_item_t *) calloc (1, sizeof (hb_language_item_t));
1.263 + if (unlikely (!lang))
1.264 + return NULL;
1.265 + lang->next = first_lang;
1.266 + *lang = key;
1.267 +
1.268 + if (!hb_atomic_ptr_cmpexch (&langs, first_lang, lang)) {
1.269 + free (lang);
1.270 + goto retry;
1.271 + }
1.272 +
1.273 +#ifdef HAVE_ATEXIT
1.274 + if (!first_lang)
1.275 + atexit (free_langs); /* First person registers atexit() callback. */
1.276 +#endif
1.277 +
1.278 + return lang;
1.279 +}
1.280 +
1.281 +
1.282 +/**
1.283 + * hb_language_from_string:
1.284 + * @str: (array length=len):
1.285 + * @len:
1.286 + *
1.287 + *
1.288 + *
1.289 + * Return value:
1.290 + *
1.291 + * Since: 1.0
1.292 + **/
1.293 +hb_language_t
1.294 +hb_language_from_string (const char *str, int len)
1.295 +{
1.296 + char strbuf[64];
1.297 +
1.298 + if (!str || !len || !*str)
1.299 + return HB_LANGUAGE_INVALID;
1.300 +
1.301 + if (len >= 0)
1.302 + {
1.303 + len = MIN (len, (int) sizeof (strbuf) - 1);
1.304 + str = (char *) memcpy (strbuf, str, len);
1.305 + strbuf[len] = '\0';
1.306 + }
1.307 +
1.308 + hb_language_item_t *item = lang_find_or_insert (str);
1.309 +
1.310 + return likely (item) ? item->lang : HB_LANGUAGE_INVALID;
1.311 +}
1.312 +
1.313 +/**
1.314 + * hb_language_to_string:
1.315 + * @language:
1.316 + *
1.317 + *
1.318 + *
1.319 + * Return value: (transfer none):
1.320 + *
1.321 + * Since: 1.0
1.322 + **/
1.323 +const char *
1.324 +hb_language_to_string (hb_language_t language)
1.325 +{
1.326 + /* This is actually NULL-safe! */
1.327 + return language->s;
1.328 +}
1.329 +
1.330 +/**
1.331 + * hb_language_get_default:
1.332 + *
1.333 + *
1.334 + *
1.335 + * Return value:
1.336 + *
1.337 + * Since: 1.0
1.338 + **/
1.339 +hb_language_t
1.340 +hb_language_get_default (void)
1.341 +{
1.342 + static hb_language_t default_language = HB_LANGUAGE_INVALID;
1.343 +
1.344 + hb_language_t language = (hb_language_t) hb_atomic_ptr_get (&default_language);
1.345 + if (unlikely (language == HB_LANGUAGE_INVALID)) {
1.346 + language = hb_language_from_string (setlocale (LC_CTYPE, NULL), -1);
1.347 + hb_atomic_ptr_cmpexch (&default_language, HB_LANGUAGE_INVALID, language);
1.348 + }
1.349 +
1.350 + return default_language;
1.351 +}
1.352 +
1.353 +
1.354 +/* hb_script_t */
1.355 +
1.356 +/**
1.357 + * hb_script_from_iso15924_tag:
1.358 + * @tag:
1.359 + *
1.360 + *
1.361 + *
1.362 + * Return value:
1.363 + *
1.364 + * Since: 1.0
1.365 + **/
1.366 +hb_script_t
1.367 +hb_script_from_iso15924_tag (hb_tag_t tag)
1.368 +{
1.369 + if (unlikely (tag == HB_TAG_NONE))
1.370 + return HB_SCRIPT_INVALID;
1.371 +
1.372 + /* Be lenient, adjust case (one capital letter followed by three small letters) */
1.373 + tag = (tag & 0xDFDFDFDF) | 0x00202020;
1.374 +
1.375 + switch (tag) {
1.376 +
1.377 + /* These graduated from the 'Q' private-area codes, but
1.378 + * the old code is still aliased by Unicode, and the Qaai
1.379 + * one in use by ICU. */
1.380 + case HB_TAG('Q','a','a','i'): return HB_SCRIPT_INHERITED;
1.381 + case HB_TAG('Q','a','a','c'): return HB_SCRIPT_COPTIC;
1.382 +
1.383 + /* Script variants from http://unicode.org/iso15924/ */
1.384 + case HB_TAG('C','y','r','s'): return HB_SCRIPT_CYRILLIC;
1.385 + case HB_TAG('L','a','t','f'): return HB_SCRIPT_LATIN;
1.386 + case HB_TAG('L','a','t','g'): return HB_SCRIPT_LATIN;
1.387 + case HB_TAG('S','y','r','e'): return HB_SCRIPT_SYRIAC;
1.388 + case HB_TAG('S','y','r','j'): return HB_SCRIPT_SYRIAC;
1.389 + case HB_TAG('S','y','r','n'): return HB_SCRIPT_SYRIAC;
1.390 + }
1.391 +
1.392 + /* If it looks right, just use the tag as a script */
1.393 + if (((uint32_t) tag & 0xE0E0E0E0) == 0x40606060)
1.394 + return (hb_script_t) tag;
1.395 +
1.396 + /* Otherwise, return unknown */
1.397 + return HB_SCRIPT_UNKNOWN;
1.398 +}
1.399 +
1.400 +/**
1.401 + * hb_script_from_string:
1.402 + * @s: (array length=len):
1.403 + * @len:
1.404 + *
1.405 + *
1.406 + *
1.407 + * Return value:
1.408 + *
1.409 + * Since: 1.0
1.410 + **/
1.411 +hb_script_t
1.412 +hb_script_from_string (const char *s, int len)
1.413 +{
1.414 + return hb_script_from_iso15924_tag (hb_tag_from_string (s, len));
1.415 +}
1.416 +
1.417 +/**
1.418 + * hb_script_to_iso15924_tag:
1.419 + * @script:
1.420 + *
1.421 + *
1.422 + *
1.423 + * Return value:
1.424 + *
1.425 + * Since: 1.0
1.426 + **/
1.427 +hb_tag_t
1.428 +hb_script_to_iso15924_tag (hb_script_t script)
1.429 +{
1.430 + return (hb_tag_t) script;
1.431 +}
1.432 +
1.433 +/**
1.434 + * hb_script_get_horizontal_direction:
1.435 + * @script:
1.436 + *
1.437 + *
1.438 + *
1.439 + * Return value:
1.440 + *
1.441 + * Since: 1.0
1.442 + **/
1.443 +hb_direction_t
1.444 +hb_script_get_horizontal_direction (hb_script_t script)
1.445 +{
1.446 + /* http://goo.gl/x9ilM */
1.447 + switch ((hb_tag_t) script)
1.448 + {
1.449 + /* Unicode-1.1 additions */
1.450 + case HB_SCRIPT_ARABIC:
1.451 + case HB_SCRIPT_HEBREW:
1.452 +
1.453 + /* Unicode-3.0 additions */
1.454 + case HB_SCRIPT_SYRIAC:
1.455 + case HB_SCRIPT_THAANA:
1.456 +
1.457 + /* Unicode-4.0 additions */
1.458 + case HB_SCRIPT_CYPRIOT:
1.459 +
1.460 + /* Unicode-4.1 additions */
1.461 + case HB_SCRIPT_KHAROSHTHI:
1.462 +
1.463 + /* Unicode-5.0 additions */
1.464 + case HB_SCRIPT_PHOENICIAN:
1.465 + case HB_SCRIPT_NKO:
1.466 +
1.467 + /* Unicode-5.1 additions */
1.468 + case HB_SCRIPT_LYDIAN:
1.469 +
1.470 + /* Unicode-5.2 additions */
1.471 + case HB_SCRIPT_AVESTAN:
1.472 + case HB_SCRIPT_IMPERIAL_ARAMAIC:
1.473 + case HB_SCRIPT_INSCRIPTIONAL_PAHLAVI:
1.474 + case HB_SCRIPT_INSCRIPTIONAL_PARTHIAN:
1.475 + case HB_SCRIPT_OLD_SOUTH_ARABIAN:
1.476 + case HB_SCRIPT_OLD_TURKIC:
1.477 + case HB_SCRIPT_SAMARITAN:
1.478 +
1.479 + /* Unicode-6.0 additions */
1.480 + case HB_SCRIPT_MANDAIC:
1.481 +
1.482 + /* Unicode-6.1 additions */
1.483 + case HB_SCRIPT_MEROITIC_CURSIVE:
1.484 + case HB_SCRIPT_MEROITIC_HIEROGLYPHS:
1.485 +
1.486 + return HB_DIRECTION_RTL;
1.487 + }
1.488 +
1.489 + return HB_DIRECTION_LTR;
1.490 +}
1.491 +
1.492 +
1.493 +/* hb_user_data_array_t */
1.494 +
1.495 +bool
1.496 +hb_user_data_array_t::set (hb_user_data_key_t *key,
1.497 + void * data,
1.498 + hb_destroy_func_t destroy,
1.499 + hb_bool_t replace)
1.500 +{
1.501 + if (!key)
1.502 + return false;
1.503 +
1.504 + if (replace) {
1.505 + if (!data && !destroy) {
1.506 + items.remove (key, lock);
1.507 + return true;
1.508 + }
1.509 + }
1.510 + hb_user_data_item_t item = {key, data, destroy};
1.511 + bool ret = !!items.replace_or_insert (item, lock, replace);
1.512 +
1.513 + return ret;
1.514 +}
1.515 +
1.516 +void *
1.517 +hb_user_data_array_t::get (hb_user_data_key_t *key)
1.518 +{
1.519 + hb_user_data_item_t item = {NULL };
1.520 +
1.521 + return items.find (key, &item, lock) ? item.data : NULL;
1.522 +}
1.523 +
1.524 +
1.525 +/* hb_version */
1.526 +
1.527 +/**
1.528 + * hb_version:
1.529 + * @major: (out): Library major version component.
1.530 + * @minor: (out): Library minor version component.
1.531 + * @micro: (out): Library micro version component.
1.532 + *
1.533 + * Returns library version as three integer components.
1.534 + *
1.535 + * Since: 1.0
1.536 + **/
1.537 +void
1.538 +hb_version (unsigned int *major,
1.539 + unsigned int *minor,
1.540 + unsigned int *micro)
1.541 +{
1.542 + *major = HB_VERSION_MAJOR;
1.543 + *minor = HB_VERSION_MINOR;
1.544 + *micro = HB_VERSION_MICRO;
1.545 +}
1.546 +
1.547 +/**
1.548 + * hb_version_string:
1.549 + *
1.550 + * Returns library version as a string with three components.
1.551 + *
1.552 + * Return value: library version string.
1.553 + *
1.554 + * Since: 1.0
1.555 + **/
1.556 +const char *
1.557 +hb_version_string (void)
1.558 +{
1.559 + return HB_VERSION_STRING;
1.560 +}
1.561 +
1.562 +/**
1.563 + * hb_version_check:
1.564 + * @major:
1.565 + * @minor:
1.566 + * @micro:
1.567 + *
1.568 + *
1.569 + *
1.570 + * Return value:
1.571 + *
1.572 + * Since: 1.0
1.573 + **/
1.574 +hb_bool_t
1.575 +hb_version_check (unsigned int major,
1.576 + unsigned int minor,
1.577 + unsigned int micro)
1.578 +{
1.579 + return HB_VERSION_CHECK (major, minor, micro);
1.580 +}
