hb-glib.cc

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Author : Behdad Esfahbod
Date : 2017-11-14 10:59:54
Hash : 93f7c165
Message : Revert "[glib/ucdn/icu/ft/ot] Make returned funcs inert" This reverts commit 5daf3bd4494cce6b4fb074533be9e99c4d9e0edd. If other atexit callbacks try to destruct the objects we destruct in atexit callbacks, bad things will happen. I'll come up with some other way to catch premature destruction of HB-owned objects. Fixes https://github.com/behdad/harfbuzz/issues/618
src/hb-glib.cc
/*
 * 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;
}

static hb_unicode_funcs_t *static_glib_funcs = nullptr;

#ifdef HB_USE_ATEXIT
static
void free_static_glib_funcs (void)
{
  hb_unicode_funcs_destroy (static_glib_funcs);
}
#endif

hb_unicode_funcs_t *
hb_glib_get_unicode_funcs (void)
{
retry:
  hb_unicode_funcs_t *funcs = (hb_unicode_funcs_t *) hb_atomic_ptr_get (&static_glib_funcs);

  if (unlikely (!funcs))
  {
    funcs = hb_unicode_funcs_create (nullptr);

#define HB_UNICODE_FUNC_IMPLEMENT(name) \
    hb_unicode_funcs_set_##name##_func (funcs, hb_glib_unicode_##name, nullptr, nullptr);
      HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT

    hb_unicode_funcs_make_immutable (funcs);

    if (!hb_atomic_ptr_cmpexch (&static_glib_funcs, nullptr, funcs)) {
      hb_unicode_funcs_destroy (funcs);
      goto retry;
    }

#ifdef HB_USE_ATEXIT
    atexit (free_static_glib_funcs); /* First person registers atexit() callback. */
#endif
  };

  return hb_unicode_funcs_reference (funcs);
}

#if GLIB_CHECK_VERSION(2,31,10)

static void
_hb_g_bytes_unref (void *data)
{
  g_bytes_unref ((GBytes *) data);
}

/**
 * hb_glib_blob_create:
 *
 * Since: 0.9.38
 **/
hb_blob_t *
hb_glib_blob_create (GBytes *gbytes)
{
  gsize size = 0;
  gconstpointer data = g_bytes_get_data (gbytes, &size);
  return hb_blob_create ((const char *) data,
			 size,
			 HB_MEMORY_MODE_READONLY,
			 g_bytes_ref (gbytes),
			 _hb_g_bytes_unref);
}
#endif
kc3-lang/harfbuzz/src/hb-glib.cc

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kc3-lang/harfbuzz /src/hb-glib.cc
