Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz-ng/src/hb-glib.cc

Index: third_party/harfbuzz-ng/src/hb-glib.cc
diff --git a/third_party/harfbuzz-ng/src/hb-glib.cc b/third_party/harfbuzz-ng/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_ABORIGINAL,
+  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
+};
+#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 unsigned int
+hb_glib_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+				 hb_codepoint_t      unicode,
+				 void               *user_data HB_UNUSED)
+
+{
+  return 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. */
+
+  if (!a || !b)
+    return FALSE;
+
+  gchar utf8[12];
+  gchar *normalized;
+  gint 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;
+  gint 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;
+}
+
+
+extern HB_INTERNAL hb_unicode_funcs_t _hb_unicode_funcs_glib;
+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
+  }
+};
+
+hb_unicode_funcs_t *
+hb_glib_get_unicode_funcs (void)
+{
+  return &_hb_glib_unicode_funcs;
+}
+