summaryrefslogtreecommitdiffstats
path: root/gfx/harfbuzz/src/hb-common.cc
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--gfx/harfbuzz/src/hb-common.cc1220
1 files changed, 1220 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-common.cc b/gfx/harfbuzz/src/hb-common.cc
new file mode 100644
index 0000000000..282a8e4d0f
--- /dev/null
+++ b/gfx/harfbuzz/src/hb-common.cc
@@ -0,0 +1,1220 @@
+/*
+ * Copyright © 2009,2010 Red Hat, Inc.
+ * Copyright © 2011,2012 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb.hh"
+#include "hb-machinery.hh"
+
+
+/**
+ * SECTION:hb-common
+ * @title: hb-common
+ * @short_description: Common data types
+ * @include: hb.h
+ *
+ * Common data types used across HarfBuzz are defined here.
+ **/
+
+
+/* hb_options_t */
+
+hb_atomic_int_t _hb_options;
+
+void
+_hb_options_init ()
+{
+ hb_options_union_t u;
+ u.i = 0;
+ u.opts.initialized = true;
+
+ const char *c = getenv ("HB_OPTIONS");
+ if (c)
+ {
+ while (*c)
+ {
+ const char *p = strchr (c, ':');
+ if (!p)
+ p = c + strlen (c);
+
+#define OPTION(name, symbol) \
+ if (0 == strncmp (c, name, p - c) && strlen (name) == static_cast<size_t>(p - c)) do { u.opts.symbol = true; } while (0)
+
+ OPTION ("uniscribe-bug-compatible", uniscribe_bug_compatible);
+
+#undef OPTION
+
+ c = *p ? p + 1 : p;
+ }
+
+ }
+
+ /* This is idempotent and threadsafe. */
+ _hb_options = u.i;
+}
+
+
+/* hb_tag_t */
+
+/**
+ * hb_tag_from_string:
+ * @str: (array length=len) (element-type uint8_t): String to convert
+ * @len: Length of @str, or -1 if it is `NULL`-terminated
+ *
+ * Converts a string into an #hb_tag_t. Valid tags
+ * are four characters. Shorter input strings will be
+ * padded with spaces. Longer input strings will be
+ * truncated.
+ *
+ * Return value: The #hb_tag_t corresponding to @str
+ *
+ * Since: 0.9.2
+ **/
+hb_tag_t
+hb_tag_from_string (const char *str, int len)
+{
+ char tag[4];
+ unsigned int i;
+
+ if (!str || !len || !*str)
+ return HB_TAG_NONE;
+
+ if (len < 0 || len > 4)
+ len = 4;
+ for (i = 0; i < (unsigned) len && str[i]; i++)
+ tag[i] = str[i];
+ for (; i < 4; i++)
+ tag[i] = ' ';
+
+ return HB_TAG (tag[0], tag[1], tag[2], tag[3]);
+}
+
+/**
+ * hb_tag_to_string:
+ * @tag: #hb_tag_t to convert
+ * @buf: (out caller-allocates) (array fixed-size=4) (element-type uint8_t): Converted string
+ *
+ * Converts an #hb_tag_t to a string and returns it in @buf.
+ * Strings will be four characters long.
+ *
+ * Since: 0.9.5
+ **/
+void
+hb_tag_to_string (hb_tag_t tag, char *buf)
+{
+ buf[0] = (char) (uint8_t) (tag >> 24);
+ buf[1] = (char) (uint8_t) (tag >> 16);
+ buf[2] = (char) (uint8_t) (tag >> 8);
+ buf[3] = (char) (uint8_t) (tag >> 0);
+}
+
+
+/* hb_direction_t */
+
+static const char direction_strings[][4] = {
+ "ltr",
+ "rtl",
+ "ttb",
+ "btt"
+};
+
+/**
+ * hb_direction_from_string:
+ * @str: (array length=len) (element-type uint8_t): String to convert
+ * @len: Length of @str, or -1 if it is `NULL`-terminated
+ *
+ * Converts a string to an #hb_direction_t.
+ *
+ * Matching is loose and applies only to the first letter. For
+ * examples, "LTR" and "left-to-right" will both return #HB_DIRECTION_LTR.
+ *
+ * Unmatched strings will return #HB_DIRECTION_INVALID.
+ *
+ * Return value: The #hb_direction_t matching @str
+ *
+ * Since: 0.9.2
+ **/
+hb_direction_t
+hb_direction_from_string (const char *str, int len)
+{
+ if (unlikely (!str || !len || !*str))
+ return HB_DIRECTION_INVALID;
+
+ /* Lets match loosely: just match the first letter, such that
+ * all of "ltr", "left-to-right", etc work!
+ */
+ char c = TOLOWER (str[0]);
+ for (unsigned int i = 0; i < ARRAY_LENGTH (direction_strings); i++)
+ if (c == direction_strings[i][0])
+ return (hb_direction_t) (HB_DIRECTION_LTR + i);
+
+ return HB_DIRECTION_INVALID;
+}
+
+/**
+ * hb_direction_to_string:
+ * @direction: The #hb_direction_t to convert
+ *
+ * Converts an #hb_direction_t to a string.
+ *
+ * Return value: (transfer none): The string corresponding to @direction
+ *
+ * Since: 0.9.2
+ **/
+const char *
+hb_direction_to_string (hb_direction_t direction)
+{
+ if (likely ((unsigned int) (direction - HB_DIRECTION_LTR)
+ < ARRAY_LENGTH (direction_strings)))
+ return direction_strings[direction - HB_DIRECTION_LTR];
+
+ return "invalid";
+}
+
+
+/* hb_language_t */
+
+struct hb_language_impl_t {
+ const char s[1];
+};
+
+static const char canon_map[256] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '-', 0, 0,
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 0, 0, 0, 0, 0, 0,
+ 0, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
+ 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 0, 0, 0, 0, '-',
+ 0, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
+ 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 0, 0, 0, 0, 0
+};
+
+static bool
+lang_equal (hb_language_t v1,
+ const void *v2)
+{
+ const unsigned char *p1 = (const unsigned char *) v1;
+ const unsigned char *p2 = (const unsigned char *) v2;
+
+ while (*p1 && *p1 == canon_map[*p2]) {
+ p1++;
+ p2++;
+ }
+
+ return *p1 == canon_map[*p2];
+}
+
+#if 0
+static unsigned int
+lang_hash (const void *key)
+{
+ const unsigned char *p = key;
+ unsigned int h = 0;
+ while (canon_map[*p])
+ {
+ h = (h << 5) - h + canon_map[*p];
+ p++;
+ }
+
+ return h;
+}
+#endif
+
+
+struct hb_language_item_t {
+
+ struct hb_language_item_t *next;
+ hb_language_t lang;
+
+ bool operator == (const char *s) const
+ { return lang_equal (lang, s); }
+
+ hb_language_item_t & operator = (const char *s)
+ {
+ /* We can't call strdup(), because we allow custom allocators. */
+ size_t len = strlen(s) + 1;
+ lang = (hb_language_t) hb_malloc(len);
+ if (likely (lang))
+ {
+ hb_memcpy((unsigned char *) lang, s, len);
+ for (unsigned char *p = (unsigned char *) lang; *p; p++)
+ *p = canon_map[*p];
+ }
+
+ return *this;
+ }
+
+ void fini () { hb_free ((void *) lang); }
+};
+
+
+/* Thread-safe lockfree language list */
+
+static hb_atomic_ptr_t <hb_language_item_t> langs;
+
+static inline void
+free_langs ()
+{
+retry:
+ hb_language_item_t *first_lang = langs;
+ if (unlikely (!langs.cmpexch (first_lang, nullptr)))
+ goto retry;
+
+ while (first_lang) {
+ hb_language_item_t *next = first_lang->next;
+ first_lang->fini ();
+ hb_free (first_lang);
+ first_lang = next;
+ }
+}
+
+static hb_language_item_t *
+lang_find_or_insert (const char *key)
+{
+retry:
+ hb_language_item_t *first_lang = langs;
+
+ for (hb_language_item_t *lang = first_lang; lang; lang = lang->next)
+ if (*lang == key)
+ return lang;
+
+ /* Not found; allocate one. */
+ hb_language_item_t *lang = (hb_language_item_t *) hb_calloc (1, sizeof (hb_language_item_t));
+ if (unlikely (!lang))
+ return nullptr;
+ lang->next = first_lang;
+ *lang = key;
+ if (unlikely (!lang->lang))
+ {
+ hb_free (lang);
+ return nullptr;
+ }
+
+ if (unlikely (!langs.cmpexch (first_lang, lang)))
+ {
+ lang->fini ();
+ hb_free (lang);
+ goto retry;
+ }
+
+ if (!first_lang)
+ hb_atexit (free_langs); /* First person registers atexit() callback. */
+
+ return lang;
+}
+
+
+/**
+ * hb_language_from_string:
+ * @str: (array length=len) (element-type uint8_t): a string representing
+ * a BCP 47 language tag
+ * @len: length of the @str, or -1 if it is `NULL`-terminated.
+ *
+ * Converts @str representing a BCP 47 language tag to the corresponding
+ * #hb_language_t.
+ *
+ * Return value: (transfer none):
+ * The #hb_language_t corresponding to the BCP 47 language tag.
+ *
+ * Since: 0.9.2
+ **/
+hb_language_t
+hb_language_from_string (const char *str, int len)
+{
+ if (!str || !len || !*str)
+ return HB_LANGUAGE_INVALID;
+
+ hb_language_item_t *item = nullptr;
+ if (len >= 0)
+ {
+ /* NUL-terminate it. */
+ char strbuf[64];
+ len = hb_min (len, (int) sizeof (strbuf) - 1);
+ hb_memcpy (strbuf, str, len);
+ strbuf[len] = '\0';
+ item = lang_find_or_insert (strbuf);
+ }
+ else
+ item = lang_find_or_insert (str);
+
+ return likely (item) ? item->lang : HB_LANGUAGE_INVALID;
+}
+
+/**
+ * hb_language_to_string:
+ * @language: The #hb_language_t to convert
+ *
+ * Converts an #hb_language_t to a string.
+ *
+ * Return value: (transfer none):
+ * A `NULL`-terminated string representing the @language. Must not be freed by
+ * the caller.
+ *
+ * Since: 0.9.2
+ **/
+const char *
+hb_language_to_string (hb_language_t language)
+{
+ if (unlikely (!language)) return nullptr;
+
+ return language->s;
+}
+
+/**
+ * hb_language_get_default:
+ *
+ * Fetch the default language from current locale.
+ *
+ * <note>Note that the first time this function is called, it calls
+ * "setlocale (LC_CTYPE, nullptr)" to fetch current locale. The underlying
+ * setlocale function is, in many implementations, NOT threadsafe. To avoid
+ * problems, call this function once before multiple threads can call it.
+ * This function is only used from hb_buffer_guess_segment_properties() by
+ * HarfBuzz itself.</note>
+ *
+ * Return value: (transfer none): The default language of the locale as
+ * an #hb_language_t
+ *
+ * Since: 0.9.2
+ **/
+hb_language_t
+hb_language_get_default ()
+{
+ static hb_atomic_ptr_t <hb_language_t> default_language;
+
+ hb_language_t language = default_language;
+ if (unlikely (language == HB_LANGUAGE_INVALID))
+ {
+ language = hb_language_from_string (hb_setlocale (LC_CTYPE, nullptr), -1);
+ (void) default_language.cmpexch (HB_LANGUAGE_INVALID, language);
+ }
+
+ return language;
+}
+
+/**
+ * hb_language_matches:
+ * @language: The #hb_language_t to work on
+ * @specific: Another #hb_language_t
+ *
+ * Check whether a second language tag is the same or a more
+ * specific version of the provided language tag. For example,
+ * "fa_IR.utf8" is a more specific tag for "fa" or for "fa_IR".
+ *
+ * Return value: `true` if languages match, `false` otherwise.
+ *
+ * Since: 5.0.0
+ **/
+hb_bool_t
+hb_language_matches (hb_language_t language,
+ hb_language_t specific)
+{
+ if (language == specific) return true;
+ if (!language || !specific) return false;
+
+ const char *l = language->s;
+ const char *s = specific->s;
+ unsigned ll = strlen (l);
+ unsigned sl = strlen (s);
+
+ if (ll > sl)
+ return false;
+
+ return strncmp (l, s, ll) == 0 &&
+ (s[ll] == '\0' || s[ll] == '-');
+}
+
+
+/* hb_script_t */
+
+/**
+ * hb_script_from_iso15924_tag:
+ * @tag: an #hb_tag_t representing an ISO 15924 tag.
+ *
+ * Converts an ISO 15924 script tag to a corresponding #hb_script_t.
+ *
+ * Return value:
+ * An #hb_script_t corresponding to the ISO 15924 tag.
+ *
+ * Since: 0.9.2
+ **/
+hb_script_t
+hb_script_from_iso15924_tag (hb_tag_t tag)
+{
+ if (unlikely (tag == HB_TAG_NONE))
+ return HB_SCRIPT_INVALID;
+
+ /* Be lenient, adjust case (one capital letter followed by three small letters) */
+ tag = (tag & 0xDFDFDFDFu) | 0x00202020u;
+
+ switch (tag) {
+
+ /* These graduated from the 'Q' private-area codes, but
+ * the old code is still aliased by Unicode, and the Qaai
+ * one in use by ICU. */
+ case HB_TAG('Q','a','a','i'): return HB_SCRIPT_INHERITED;
+ case HB_TAG('Q','a','a','c'): return HB_SCRIPT_COPTIC;
+
+ /* Script variants from https://unicode.org/iso15924/ */
+ case HB_TAG('A','r','a','n'): return HB_SCRIPT_ARABIC;
+ case HB_TAG('C','y','r','s'): return HB_SCRIPT_CYRILLIC;
+ case HB_TAG('G','e','o','k'): return HB_SCRIPT_GEORGIAN;
+ case HB_TAG('H','a','n','s'): return HB_SCRIPT_HAN;
+ case HB_TAG('H','a','n','t'): return HB_SCRIPT_HAN;
+ case HB_TAG('J','a','m','o'): return HB_SCRIPT_HANGUL;
+ case HB_TAG('L','a','t','f'): return HB_SCRIPT_LATIN;
+ case HB_TAG('L','a','t','g'): return HB_SCRIPT_LATIN;
+ case HB_TAG('S','y','r','e'): return HB_SCRIPT_SYRIAC;
+ case HB_TAG('S','y','r','j'): return HB_SCRIPT_SYRIAC;
+ case HB_TAG('S','y','r','n'): return HB_SCRIPT_SYRIAC;
+ }
+
+ /* If it looks right, just use the tag as a script */
+ if (((uint32_t) tag & 0xE0E0E0E0u) == 0x40606060u)
+ return (hb_script_t) tag;
+
+ /* Otherwise, return unknown */
+ return HB_SCRIPT_UNKNOWN;
+}
+
+/**
+ * hb_script_from_string:
+ * @str: (array length=len) (element-type uint8_t): a string representing an
+ * ISO 15924 tag.
+ * @len: length of the @str, or -1 if it is `NULL`-terminated.
+ *
+ * Converts a string @str representing an ISO 15924 script tag to a
+ * corresponding #hb_script_t. Shorthand for hb_tag_from_string() then
+ * hb_script_from_iso15924_tag().
+ *
+ * Return value:
+ * An #hb_script_t corresponding to the ISO 15924 tag.
+ *
+ * Since: 0.9.2
+ **/
+hb_script_t
+hb_script_from_string (const char *str, int len)
+{
+ return hb_script_from_iso15924_tag (hb_tag_from_string (str, len));
+}
+
+/**
+ * hb_script_to_iso15924_tag:
+ * @script: an #hb_script_t to convert.
+ *
+ * Converts an #hb_script_t to a corresponding ISO 15924 script tag.
+ *
+ * Return value:
+ * An #hb_tag_t representing an ISO 15924 script tag.
+ *
+ * Since: 0.9.2
+ **/
+hb_tag_t
+hb_script_to_iso15924_tag (hb_script_t script)
+{
+ return (hb_tag_t) script;
+}
+
+/**
+ * hb_script_get_horizontal_direction:
+ * @script: The #hb_script_t to query
+ *
+ * Fetches the #hb_direction_t of a script when it is
+ * set horizontally. All right-to-left scripts will return
+ * #HB_DIRECTION_RTL. All left-to-right scripts will return
+ * #HB_DIRECTION_LTR. Scripts that can be written either
+ * horizontally or vertically will return #HB_DIRECTION_INVALID.
+ * Unknown scripts will return #HB_DIRECTION_LTR.
+ *
+ * Return value: The horizontal #hb_direction_t of @script
+ *
+ * Since: 0.9.2
+ **/
+hb_direction_t
+hb_script_get_horizontal_direction (hb_script_t script)
+{
+ /* https://docs.google.com/spreadsheets/d/1Y90M0Ie3MUJ6UVCRDOypOtijlMDLNNyyLk36T6iMu0o */
+ switch ((hb_tag_t) script)
+ {
+ /* Unicode-1.1 additions */
+ case HB_SCRIPT_ARABIC:
+ case HB_SCRIPT_HEBREW:
+
+ /* Unicode-3.0 additions */
+ case HB_SCRIPT_SYRIAC:
+ case HB_SCRIPT_THAANA:
+
+ /* Unicode-4.0 additions */
+ case HB_SCRIPT_CYPRIOT:
+
+ /* Unicode-4.1 additions */
+ case HB_SCRIPT_KHAROSHTHI:
+
+ /* Unicode-5.0 additions */
+ case HB_SCRIPT_PHOENICIAN:
+ case HB_SCRIPT_NKO:
+
+ /* Unicode-5.1 additions */
+ case HB_SCRIPT_LYDIAN:
+
+ /* Unicode-5.2 additions */
+ case HB_SCRIPT_AVESTAN:
+ case HB_SCRIPT_IMPERIAL_ARAMAIC:
+ case HB_SCRIPT_INSCRIPTIONAL_PAHLAVI:
+ case HB_SCRIPT_INSCRIPTIONAL_PARTHIAN:
+ case HB_SCRIPT_OLD_SOUTH_ARABIAN:
+ case HB_SCRIPT_OLD_TURKIC:
+ case HB_SCRIPT_SAMARITAN:
+
+ /* Unicode-6.0 additions */
+ case HB_SCRIPT_MANDAIC:
+
+ /* Unicode-6.1 additions */
+ case HB_SCRIPT_MEROITIC_CURSIVE:
+ case HB_SCRIPT_MEROITIC_HIEROGLYPHS:
+
+ /* Unicode-7.0 additions */
+ case HB_SCRIPT_MANICHAEAN:
+ case HB_SCRIPT_MENDE_KIKAKUI:
+ case HB_SCRIPT_NABATAEAN:
+ case HB_SCRIPT_OLD_NORTH_ARABIAN:
+ case HB_SCRIPT_PALMYRENE:
+ case HB_SCRIPT_PSALTER_PAHLAVI:
+
+ /* Unicode-8.0 additions */
+ case HB_SCRIPT_HATRAN:
+
+ /* Unicode-9.0 additions */
+ case HB_SCRIPT_ADLAM:
+
+ /* Unicode-11.0 additions */
+ case HB_SCRIPT_HANIFI_ROHINGYA:
+ case HB_SCRIPT_OLD_SOGDIAN:
+ case HB_SCRIPT_SOGDIAN:
+
+ /* Unicode-12.0 additions */
+ case HB_SCRIPT_ELYMAIC:
+
+ /* Unicode-13.0 additions */
+ case HB_SCRIPT_CHORASMIAN:
+ case HB_SCRIPT_YEZIDI:
+
+ /* Unicode-14.0 additions */
+ case HB_SCRIPT_OLD_UYGHUR:
+
+ return HB_DIRECTION_RTL;
+
+
+ /* https://github.com/harfbuzz/harfbuzz/issues/1000 */
+ case HB_SCRIPT_OLD_HUNGARIAN:
+ case HB_SCRIPT_OLD_ITALIC:
+ case HB_SCRIPT_RUNIC:
+ case HB_SCRIPT_TIFINAGH:
+
+ return HB_DIRECTION_INVALID;
+ }
+
+ return HB_DIRECTION_LTR;
+}
+
+
+/* hb_version */
+
+
+/**
+ * SECTION:hb-version
+ * @title: hb-version
+ * @short_description: Information about the version of HarfBuzz in use
+ * @include: hb.h
+ *
+ * These functions and macros allow accessing version of the HarfBuzz
+ * library used at compile- as well as run-time, and to direct code
+ * conditionally based on those versions, again, at compile- or run-time.
+ **/
+
+
+/**
+ * hb_version:
+ * @major: (out): Library major version component
+ * @minor: (out): Library minor version component
+ * @micro: (out): Library micro version component
+ *
+ * Returns library version as three integer components.
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_version (unsigned int *major,
+ unsigned int *minor,
+ unsigned int *micro)
+{
+ *major = HB_VERSION_MAJOR;
+ *minor = HB_VERSION_MINOR;
+ *micro = HB_VERSION_MICRO;
+}
+
+/**
+ * hb_version_string:
+ *
+ * Returns library version as a string with three components.
+ *
+ * Return value: Library version string
+ *
+ * Since: 0.9.2
+ **/
+const char *
+hb_version_string ()
+{
+ return HB_VERSION_STRING;
+}
+
+/**
+ * hb_version_atleast:
+ * @major: Library major version component
+ * @minor: Library minor version component
+ * @micro: Library micro version component
+ *
+ * Tests the library version against a minimum value,
+ * as three integer components.
+ *
+ * Return value: `true` if the library is equal to or greater than
+ * the test value, `false` otherwise
+ *
+ * Since: 0.9.30
+ **/
+hb_bool_t
+hb_version_atleast (unsigned int major,
+ unsigned int minor,
+ unsigned int micro)
+{
+ return HB_VERSION_ATLEAST (major, minor, micro);
+}
+
+
+
+/* hb_feature_t and hb_variation_t */
+
+static bool
+parse_space (const char **pp, const char *end)
+{
+ while (*pp < end && ISSPACE (**pp))
+ (*pp)++;
+ return true;
+}
+
+static bool
+parse_char (const char **pp, const char *end, char c)
+{
+ parse_space (pp, end);
+
+ if (*pp == end || **pp != c)
+ return false;
+
+ (*pp)++;
+ return true;
+}
+
+static bool
+parse_uint (const char **pp, const char *end, unsigned int *pv)
+{
+ /* Intentionally use hb_parse_int inside instead of hb_parse_uint,
+ * such that -1 turns into "big number"... */
+ int v;
+ if (unlikely (!hb_parse_int (pp, end, &v))) return false;
+
+ *pv = v;
+ return true;
+}
+
+static bool
+parse_uint32 (const char **pp, const char *end, uint32_t *pv)
+{
+ /* Intentionally use hb_parse_int inside instead of hb_parse_uint,
+ * such that -1 turns into "big number"... */
+ int v;
+ if (unlikely (!hb_parse_int (pp, end, &v))) return false;
+
+ *pv = v;
+ return true;
+}
+
+static bool
+parse_bool (const char **pp, const char *end, uint32_t *pv)
+{
+ parse_space (pp, end);
+
+ const char *p = *pp;
+ while (*pp < end && ISALPHA(**pp))
+ (*pp)++;
+
+ /* CSS allows on/off as aliases 1/0. */
+ if (*pp - p == 2
+ && TOLOWER (p[0]) == 'o'
+ && TOLOWER (p[1]) == 'n')
+ *pv = 1;
+ else if (*pp - p == 3
+ && TOLOWER (p[0]) == 'o'
+ && TOLOWER (p[1]) == 'f'
+ && TOLOWER (p[2]) == 'f')
+ *pv = 0;
+ else
+ return false;
+
+ return true;
+}
+
+/* hb_feature_t */
+
+static bool
+parse_feature_value_prefix (const char **pp, const char *end, hb_feature_t *feature)
+{
+ if (parse_char (pp, end, '-'))
+ feature->value = 0;
+ else {
+ parse_char (pp, end, '+');
+ feature->value = 1;
+ }
+
+ return true;
+}
+
+static bool
+parse_tag (const char **pp, const char *end, hb_tag_t *tag)
+{
+ parse_space (pp, end);
+
+ char quote = 0;
+
+ if (*pp < end && (**pp == '\'' || **pp == '"'))
+ {
+ quote = **pp;
+ (*pp)++;
+ }
+
+ const char *p = *pp;
+ while (*pp < end && (ISALNUM(**pp) || **pp == '_'))
+ (*pp)++;
+
+ if (p == *pp || *pp - p > 4)
+ return false;
+
+ *tag = hb_tag_from_string (p, *pp - p);
+
+ if (quote)
+ {
+ /* CSS expects exactly four bytes. And we only allow quotations for
+ * CSS compatibility. So, enforce the length. */
+ if (*pp - p != 4)
+ return false;
+ if (*pp == end || **pp != quote)
+ return false;
+ (*pp)++;
+ }
+
+ return true;
+}
+
+static bool
+parse_feature_indices (const char **pp, const char *end, hb_feature_t *feature)
+{
+ parse_space (pp, end);
+
+ bool has_start;
+
+ feature->start = HB_FEATURE_GLOBAL_START;
+ feature->end = HB_FEATURE_GLOBAL_END;
+
+ if (!parse_char (pp, end, '['))
+ return true;
+
+ has_start = parse_uint (pp, end, &feature->start);
+
+ if (parse_char (pp, end, ':') || parse_char (pp, end, ';')) {
+ parse_uint (pp, end, &feature->end);
+ } else {
+ if (has_start)
+ feature->end = feature->start + 1;
+ }
+
+ return parse_char (pp, end, ']');
+}
+
+static bool
+parse_feature_value_postfix (const char **pp, const char *end, hb_feature_t *feature)
+{
+ bool had_equal = parse_char (pp, end, '=');
+ bool had_value = parse_uint32 (pp, end, &feature->value) ||
+ parse_bool (pp, end, &feature->value);
+ /* CSS doesn't use equal-sign between tag and value.
+ * If there was an equal-sign, then there *must* be a value.
+ * A value without an equal-sign is ok, but not required. */
+ return !had_equal || had_value;
+}
+
+static bool
+parse_one_feature (const char **pp, const char *end, hb_feature_t *feature)
+{
+ return parse_feature_value_prefix (pp, end, feature) &&
+ parse_tag (pp, end, &feature->tag) &&
+ parse_feature_indices (pp, end, feature) &&
+ parse_feature_value_postfix (pp, end, feature) &&
+ parse_space (pp, end) &&
+ *pp == end;
+}
+
+/**
+ * hb_feature_from_string:
+ * @str: (array length=len) (element-type uint8_t): a string to parse
+ * @len: length of @str, or -1 if string is `NULL` terminated
+ * @feature: (out): the #hb_feature_t to initialize with the parsed values
+ *
+ * Parses a string into a #hb_feature_t.
+ *
+ * The format for specifying feature strings follows. All valid CSS
+ * font-feature-settings values other than 'normal' and the global values are
+ * also accepted, though not documented below. CSS string escapes are not
+ * supported.
+ *
+ * The range indices refer to the positions between Unicode characters. The
+ * position before the first character is always 0.
+ *
+ * The format is Python-esque. Here is how it all works:
+ *
+ * <informaltable pgwide='1' align='left' frame='none'>
+ * <tgroup cols='5'>
+ * <thead>
+ * <row><entry>Syntax</entry> <entry>Value</entry> <entry>Start</entry> <entry>End</entry></row>
+ * </thead>
+ * <tbody>
+ * <row><entry>Setting value:</entry></row>
+ * <row><entry>kern</entry> <entry>1</entry> <entry>0</entry> <entry>∞</entry> <entry>Turn feature on</entry></row>
+ * <row><entry>+kern</entry> <entry>1</entry> <entry>0</entry> <entry>∞</entry> <entry>Turn feature on</entry></row>
+ * <row><entry>-kern</entry> <entry>0</entry> <entry>0</entry> <entry>∞</entry> <entry>Turn feature off</entry></row>
+ * <row><entry>kern=0</entry> <entry>0</entry> <entry>0</entry> <entry>∞</entry> <entry>Turn feature off</entry></row>
+ * <row><entry>kern=1</entry> <entry>1</entry> <entry>0</entry> <entry>∞</entry> <entry>Turn feature on</entry></row>
+ * <row><entry>aalt=2</entry> <entry>2</entry> <entry>0</entry> <entry>∞</entry> <entry>Choose 2nd alternate</entry></row>
+ * <row><entry>Setting index:</entry></row>
+ * <row><entry>kern[]</entry> <entry>1</entry> <entry>0</entry> <entry>∞</entry> <entry>Turn feature on</entry></row>
+ * <row><entry>kern[:]</entry> <entry>1</entry> <entry>0</entry> <entry>∞</entry> <entry>Turn feature on</entry></row>
+ * <row><entry>kern[5:]</entry> <entry>1</entry> <entry>5</entry> <entry>∞</entry> <entry>Turn feature on, partial</entry></row>
+ * <row><entry>kern[:5]</entry> <entry>1</entry> <entry>0</entry> <entry>5</entry> <entry>Turn feature on, partial</entry></row>
+ * <row><entry>kern[3:5]</entry> <entry>1</entry> <entry>3</entry> <entry>5</entry> <entry>Turn feature on, range</entry></row>
+ * <row><entry>kern[3]</entry> <entry>1</entry> <entry>3</entry> <entry>3+1</entry> <entry>Turn feature on, single char</entry></row>
+ * <row><entry>Mixing it all:</entry></row>
+ * <row><entry>aalt[3:5]=2</entry> <entry>2</entry> <entry>3</entry> <entry>5</entry> <entry>Turn 2nd alternate on for range</entry></row>
+ * </tbody>
+ * </tgroup>
+ * </informaltable>
+ *
+ * Return value:
+ * `true` if @str is successfully parsed, `false` otherwise
+ *
+ * Since: 0.9.5
+ **/
+hb_bool_t
+hb_feature_from_string (const char *str, int len,
+ hb_feature_t *feature)
+{
+ hb_feature_t feat;
+
+ if (len < 0)
+ len = strlen (str);
+
+ if (likely (parse_one_feature (&str, str + len, &feat)))
+ {
+ if (feature)
+ *feature = feat;
+ return true;
+ }
+
+ if (feature)
+ hb_memset (feature, 0, sizeof (*feature));
+ return false;
+}
+
+/**
+ * hb_feature_to_string:
+ * @feature: an #hb_feature_t to convert
+ * @buf: (array length=size) (out): output string
+ * @size: the allocated size of @buf
+ *
+ * Converts a #hb_feature_t into a `NULL`-terminated string in the format
+ * understood by hb_feature_from_string(). The client in responsible for
+ * allocating big enough size for @buf, 128 bytes is more than enough.
+ *
+ * Since: 0.9.5
+ **/
+void
+hb_feature_to_string (hb_feature_t *feature,
+ char *buf, unsigned int size)
+{
+ if (unlikely (!size)) return;
+
+ char s[128];
+ unsigned int len = 0;
+ if (feature->value == 0)
+ s[len++] = '-';
+ hb_tag_to_string (feature->tag, s + len);
+ len += 4;
+ while (len && s[len - 1] == ' ')
+ len--;
+ if (feature->start != HB_FEATURE_GLOBAL_START || feature->end != HB_FEATURE_GLOBAL_END)
+ {
+ s[len++] = '[';
+ if (feature->start)
+ len += hb_max (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->start));
+ if (feature->end != feature->start + 1) {
+ s[len++] = ':';
+ if (feature->end != HB_FEATURE_GLOBAL_END)
+ len += hb_max (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->end));
+ }
+ s[len++] = ']';
+ }
+ if (feature->value > 1)
+ {
+ s[len++] = '=';
+ len += hb_max (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->value));
+ }
+ assert (len < ARRAY_LENGTH (s));
+ len = hb_min (len, size - 1);
+ hb_memcpy (buf, s, len);
+ buf[len] = '\0';
+}
+
+/* hb_variation_t */
+
+static bool
+parse_variation_value (const char **pp, const char *end, hb_variation_t *variation)
+{
+ parse_char (pp, end, '='); /* Optional. */
+ double v;
+ if (unlikely (!hb_parse_double (pp, end, &v))) return false;
+
+ variation->value = v;
+ return true;
+}
+
+static bool
+parse_one_variation (const char **pp, const char *end, hb_variation_t *variation)
+{
+ return parse_tag (pp, end, &variation->tag) &&
+ parse_variation_value (pp, end, variation) &&
+ parse_space (pp, end) &&
+ *pp == end;
+}
+
+/**
+ * hb_variation_from_string:
+ * @str: (array length=len) (element-type uint8_t): a string to parse
+ * @len: length of @str, or -1 if string is `NULL` terminated
+ * @variation: (out): the #hb_variation_t to initialize with the parsed values
+ *
+ * Parses a string into a #hb_variation_t.
+ *
+ * The format for specifying variation settings follows. All valid CSS
+ * font-variation-settings values other than 'normal' and 'inherited' are also
+ * accepted, though, not documented below.
+ *
+ * The format is a tag, optionally followed by an equals sign, followed by a
+ * number. For example `wght=500`, or `slnt=-7.5`.
+ *
+ * Return value:
+ * `true` if @str is successfully parsed, `false` otherwise
+ *
+ * Since: 1.4.2
+ */
+hb_bool_t
+hb_variation_from_string (const char *str, int len,
+ hb_variation_t *variation)
+{
+ hb_variation_t var;
+
+ if (len < 0)
+ len = strlen (str);
+
+ if (likely (parse_one_variation (&str, str + len, &var)))
+ {
+ if (variation)
+ *variation = var;
+ return true;
+ }
+
+ if (variation)
+ hb_memset (variation, 0, sizeof (*variation));
+ return false;
+}
+
+#ifndef HB_NO_SETLOCALE
+
+static inline void free_static_C_locale ();
+
+static struct hb_C_locale_lazy_loader_t : hb_lazy_loader_t<hb_remove_pointer<hb_locale_t>,
+ hb_C_locale_lazy_loader_t>
+{
+ static hb_locale_t create ()
+ {
+ hb_locale_t l = newlocale (LC_ALL_MASK, "C", NULL);
+ if (!l)
+ return l;
+
+ hb_atexit (free_static_C_locale);
+
+ return l;
+ }
+ static void destroy (hb_locale_t l)
+ {
+ freelocale (l);
+ }
+ static hb_locale_t get_null ()
+ {
+ return (hb_locale_t) 0;
+ }
+} static_C_locale;
+
+static inline
+void free_static_C_locale ()
+{
+ static_C_locale.free_instance ();
+}
+
+static hb_locale_t
+get_C_locale ()
+{
+ return static_C_locale.get_unconst ();
+}
+
+#endif
+
+/**
+ * hb_variation_to_string:
+ * @variation: an #hb_variation_t to convert
+ * @buf: (array length=size) (out caller-allocates): output string
+ * @size: the allocated size of @buf
+ *
+ * Converts an #hb_variation_t into a `NULL`-terminated string in the format
+ * understood by hb_variation_from_string(). The client in responsible for
+ * allocating big enough size for @buf, 128 bytes is more than enough.
+ *
+ * Since: 1.4.2
+ */
+void
+hb_variation_to_string (hb_variation_t *variation,
+ char *buf, unsigned int size)
+{
+ if (unlikely (!size)) return;
+
+ char s[128];
+ unsigned int len = 0;
+ hb_tag_to_string (variation->tag, s + len);
+ len += 4;
+ while (len && s[len - 1] == ' ')
+ len--;
+ s[len++] = '=';
+
+ hb_locale_t oldlocale HB_UNUSED;
+ oldlocale = hb_uselocale (get_C_locale ());
+ len += hb_max (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%g", (double) variation->value));
+ (void) hb_uselocale (oldlocale);
+
+ assert (len < ARRAY_LENGTH (s));
+ len = hb_min (len, size - 1);
+ hb_memcpy (buf, s, len);
+ buf[len] = '\0';
+}
+
+/**
+ * hb_color_get_alpha:
+ * @color: an #hb_color_t we are interested in its channels.
+ *
+ * Fetches the alpha channel of the given @color.
+ *
+ * Return value: Alpha channel value
+ *
+ * Since: 2.1.0
+ */
+uint8_t
+(hb_color_get_alpha) (hb_color_t color)
+{
+ return hb_color_get_alpha (color);
+}
+
+/**
+ * hb_color_get_red:
+ * @color: an #hb_color_t we are interested in its channels.
+ *
+ * Fetches the red channel of the given @color.
+ *
+ * Return value: Red channel value
+ *
+ * Since: 2.1.0
+ */
+uint8_t
+(hb_color_get_red) (hb_color_t color)
+{
+ return hb_color_get_red (color);
+}
+
+/**
+ * hb_color_get_green:
+ * @color: an #hb_color_t we are interested in its channels.
+ *
+ * Fetches the green channel of the given @color.
+ *
+ * Return value: Green channel value
+ *
+ * Since: 2.1.0
+ */
+uint8_t
+(hb_color_get_green) (hb_color_t color)
+{
+ return hb_color_get_green (color);
+}
+
+/**
+ * hb_color_get_blue:
+ * @color: an #hb_color_t we are interested in its channels.
+ *
+ * Fetches the blue channel of the given @color.
+ *
+ * Return value: Blue channel value
+ *
+ * Since: 2.1.0
+ */
+uint8_t
+(hb_color_get_blue) (hb_color_t color)
+{
+ return hb_color_get_blue (color);
+}
+
+
+/* If there is no visibility control, then hb-static.cc will NOT
+ * define anything. Instead, we get it to define one set in here
+ * only, so only libharfbuzz.so defines them, not other libs. */
+#ifdef HB_NO_VISIBILITY
+#undef HB_NO_VISIBILITY
+#include "hb-static.cc"
+#define HB_NO_VISIBILITY 1
+#endif