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harfbuzz/src/hb-glib.cc

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/*
* Copyright © 2009 Red Hat, Inc.
* Copyright © 2011 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-private.hh"
#include "hb-glib.h"
#include "hb-unicode-private.hh"
#if !GLIB_CHECK_VERSION(2,29,14)
static const hb_script_t
glib_script_to_script[] =
{
HB_SCRIPT_COMMON,
HB_SCRIPT_INHERITED,
HB_SCRIPT_ARABIC,
HB_SCRIPT_ARMENIAN,
HB_SCRIPT_BENGALI,
HB_SCRIPT_BOPOMOFO,
HB_SCRIPT_CHEROKEE,
HB_SCRIPT_COPTIC,
HB_SCRIPT_CYRILLIC,
HB_SCRIPT_DESERET,
HB_SCRIPT_DEVANAGARI,
HB_SCRIPT_ETHIOPIC,
HB_SCRIPT_GEORGIAN,
HB_SCRIPT_GOTHIC,
HB_SCRIPT_GREEK,
HB_SCRIPT_GUJARATI,
HB_SCRIPT_GURMUKHI,
HB_SCRIPT_HAN,
HB_SCRIPT_HANGUL,
HB_SCRIPT_HEBREW,
HB_SCRIPT_HIRAGANA,
HB_SCRIPT_KANNADA,
HB_SCRIPT_KATAKANA,
HB_SCRIPT_KHMER,
HB_SCRIPT_LAO,
HB_SCRIPT_LATIN,
HB_SCRIPT_MALAYALAM,
HB_SCRIPT_MONGOLIAN,
HB_SCRIPT_MYANMAR,
HB_SCRIPT_OGHAM,
HB_SCRIPT_OLD_ITALIC,
HB_SCRIPT_ORIYA,
HB_SCRIPT_RUNIC,
HB_SCRIPT_SINHALA,
HB_SCRIPT_SYRIAC,
HB_SCRIPT_TAMIL,
HB_SCRIPT_TELUGU,
HB_SCRIPT_THAANA,
HB_SCRIPT_THAI,
HB_SCRIPT_TIBETAN,
HB_SCRIPT_CANADIAN_SYLLABICS,
HB_SCRIPT_YI,
HB_SCRIPT_TAGALOG,
HB_SCRIPT_HANUNOO,
HB_SCRIPT_BUHID,
HB_SCRIPT_TAGBANWA,
/* Unicode-4.0 additions */
HB_SCRIPT_BRAILLE,
HB_SCRIPT_CYPRIOT,
HB_SCRIPT_LIMBU,
HB_SCRIPT_OSMANYA,
HB_SCRIPT_SHAVIAN,
HB_SCRIPT_LINEAR_B,
HB_SCRIPT_TAI_LE,
HB_SCRIPT_UGARITIC,
/* Unicode-4.1 additions */
HB_SCRIPT_NEW_TAI_LUE,
HB_SCRIPT_BUGINESE,
HB_SCRIPT_GLAGOLITIC,
HB_SCRIPT_TIFINAGH,
HB_SCRIPT_SYLOTI_NAGRI,
HB_SCRIPT_OLD_PERSIAN,
HB_SCRIPT_KHAROSHTHI,
/* Unicode-5.0 additions */
HB_SCRIPT_UNKNOWN,
HB_SCRIPT_BALINESE,
HB_SCRIPT_CUNEIFORM,
HB_SCRIPT_PHOENICIAN,
HB_SCRIPT_PHAGS_PA,
HB_SCRIPT_NKO,
/* Unicode-5.1 additions */
HB_SCRIPT_KAYAH_LI,
HB_SCRIPT_LEPCHA,
HB_SCRIPT_REJANG,
HB_SCRIPT_SUNDANESE,
HB_SCRIPT_SAURASHTRA,
HB_SCRIPT_CHAM,
HB_SCRIPT_OL_CHIKI,
HB_SCRIPT_VAI,
HB_SCRIPT_CARIAN,
HB_SCRIPT_LYCIAN,
HB_SCRIPT_LYDIAN,
/* Unicode-5.2 additions */
HB_SCRIPT_AVESTAN,
HB_SCRIPT_BAMUM,
HB_SCRIPT_EGYPTIAN_HIEROGLYPHS,
HB_SCRIPT_IMPERIAL_ARAMAIC,
HB_SCRIPT_INSCRIPTIONAL_PAHLAVI,
HB_SCRIPT_INSCRIPTIONAL_PARTHIAN,
HB_SCRIPT_JAVANESE,
HB_SCRIPT_KAITHI,
HB_SCRIPT_TAI_THAM,
HB_SCRIPT_LISU,
HB_SCRIPT_MEETEI_MAYEK,
HB_SCRIPT_OLD_SOUTH_ARABIAN,
HB_SCRIPT_OLD_TURKIC,
HB_SCRIPT_SAMARITAN,
HB_SCRIPT_TAI_VIET,
/* Unicode-6.0 additions */
HB_SCRIPT_BATAK,
HB_SCRIPT_BRAHMI,
HB_SCRIPT_MANDAIC,
/* Unicode-6.1 additions */
HB_SCRIPT_CHAKMA,
HB_SCRIPT_MEROITIC_CURSIVE,
HB_SCRIPT_MEROITIC_HIEROGLYPHS,
HB_SCRIPT_MIAO,
HB_SCRIPT_SHARADA,
HB_SCRIPT_SORA_SOMPENG,
HB_SCRIPT_TAKRI
};
#endif
hb_script_t
hb_glib_script_to_script (GUnicodeScript script)
{
#if GLIB_CHECK_VERSION(2,29,14)
return (hb_script_t) g_unicode_script_to_iso15924 (script);
#else
if (likely ((unsigned int) script < ARRAY_LENGTH (glib_script_to_script)))
return glib_script_to_script[script];
if (unlikely (script == G_UNICODE_SCRIPT_INVALID_CODE))
return HB_SCRIPT_INVALID;
return HB_SCRIPT_UNKNOWN;
#endif
}
GUnicodeScript
hb_glib_script_from_script (hb_script_t script)
{
#if GLIB_CHECK_VERSION(2,29,14)
return g_unicode_script_from_iso15924 (script);
#else
unsigned int count = ARRAY_LENGTH (glib_script_to_script);
for (unsigned int i = 0; i < count; i++)
if (glib_script_to_script[i] == script)
return (GUnicodeScript) i;
if (unlikely (script == HB_SCRIPT_INVALID))
return G_UNICODE_SCRIPT_INVALID_CODE;
return G_UNICODE_SCRIPT_UNKNOWN;
#endif
}
static hb_unicode_combining_class_t
hb_glib_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode,
void *user_data HB_UNUSED)
{
return (hb_unicode_combining_class_t) g_unichar_combining_class (unicode);
}
static unsigned int
hb_glib_unicode_eastasian_width (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode,
void *user_data HB_UNUSED)
{
return g_unichar_iswide (unicode) ? 2 : 1;
}
static hb_unicode_general_category_t
hb_glib_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode,
void *user_data HB_UNUSED)
{
/* hb_unicode_general_category_t and GUnicodeType are identical */
return (hb_unicode_general_category_t) g_unichar_type (unicode);
}
static hb_codepoint_t
hb_glib_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode,
void *user_data HB_UNUSED)
{
g_unichar_get_mirror_char (unicode, &unicode);
return unicode;
}
static hb_script_t
hb_glib_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode,
void *user_data HB_UNUSED)
{
return hb_glib_script_to_script (g_unichar_get_script (unicode));
}
static hb_bool_t
hb_glib_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t a,
hb_codepoint_t b,
hb_codepoint_t *ab,
void *user_data HB_UNUSED)
{
#if GLIB_CHECK_VERSION(2,29,12)
return g_unichar_compose (a, b, ab);
#endif
/* We don't ifdef-out the fallback code such that compiler always
* sees it and makes sure it's compilable. */
gchar utf8[12];
gchar *normalized;
int len;
hb_bool_t ret;
len = g_unichar_to_utf8 (a, utf8);
len += g_unichar_to_utf8 (b, utf8 + len);
normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFC);
len = g_utf8_strlen (normalized, -1);
if (unlikely (!len))
return false;
if (len == 1) {
*ab = g_utf8_get_char (normalized);
ret = true;
} else {
ret = false;
}
g_free (normalized);
return ret;
}
static hb_bool_t
hb_glib_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t ab,
hb_codepoint_t *a,
hb_codepoint_t *b,
void *user_data HB_UNUSED)
{
#if GLIB_CHECK_VERSION(2,29,12)
return g_unichar_decompose (ab, a, b);
#endif
/* We don't ifdef-out the fallback code such that compiler always
* sees it and makes sure it's compilable. */
gchar utf8[6];
gchar *normalized;
int len;
hb_bool_t ret;
len = g_unichar_to_utf8 (ab, utf8);
normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFD);
len = g_utf8_strlen (normalized, -1);
if (unlikely (!len))
return false;
if (len == 1) {
*a = g_utf8_get_char (normalized);
*b = 0;
ret = *a != ab;
} else if (len == 2) {
*a = g_utf8_get_char (normalized);
*b = g_utf8_get_char (g_utf8_next_char (normalized));
/* Here's the ugly part: if ab decomposes to a single character and
* that character decomposes again, we have to detect that and undo
* the second part :-(. */
gchar *recomposed = g_utf8_normalize (normalized, -1, G_NORMALIZE_NFC);
hb_codepoint_t c = g_utf8_get_char (recomposed);
if (c != ab && c != *a) {
*a = c;
*b = 0;
}
g_free (recomposed);
ret = true;
} else {
/* If decomposed to more than two characters, take the last one,
* and recompose the rest to get the first component. */
gchar *end = g_utf8_offset_to_pointer (normalized, len - 1);
gchar *recomposed;
*b = g_utf8_get_char (end);
recomposed = g_utf8_normalize (normalized, end - normalized, G_NORMALIZE_NFC);
/* We expect that recomposed has exactly one character now. */
*a = g_utf8_get_char (recomposed);
g_free (recomposed);
ret = true;
}
g_free (normalized);
return ret;
}
static unsigned int
hb_glib_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t u,
hb_codepoint_t *decomposed,
void *user_data HB_UNUSED)
{
#if GLIB_CHECK_VERSION(2,29,12)
return g_unichar_fully_decompose (u, true, decomposed, HB_UNICODE_MAX_DECOMPOSITION_LEN);
#endif
/* If the user doesn't have GLib >= 2.29.12 we have to perform
* a round trip to UTF-8 and the associated memory management dance. */
gchar utf8[6];
gchar *utf8_decomposed, *c;
gsize utf8_len, utf8_decomposed_len, i;
/* Convert @u to UTF-8 and normalise it in NFKD mode. This performs the compatibility decomposition. */
utf8_len = g_unichar_to_utf8 (u, utf8);
utf8_decomposed = g_utf8_normalize (utf8, utf8_len, G_NORMALIZE_NFKD);
utf8_decomposed_len = g_utf8_strlen (utf8_decomposed, -1);
assert (utf8_decomposed_len <= HB_UNICODE_MAX_DECOMPOSITION_LEN);
for (i = 0, c = utf8_decomposed; i < utf8_decomposed_len; i++, c = g_utf8_next_char (c))
*decomposed++ = g_utf8_get_char (c);
g_free (utf8_decomposed);
return utf8_decomposed_len;
}
hb_unicode_funcs_t *
hb_glib_get_unicode_funcs (void)
{
static const hb_unicode_funcs_t _hb_glib_unicode_funcs = {
HB_OBJECT_HEADER_STATIC,
NULL, /* parent */
true, /* immutable */
{
#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_glib_unicode_##name,
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
}
};
return const_cast<hb_unicode_funcs_t *> (&_hb_glib_unicode_funcs);
}
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