[Indic] Suppress reph formation upon joiners

[framework/uifw/harfbuzz.git] / src / hb-glib.cc

diff --git a/src/hb-glib.cc b/src/hb-glib.cc
index 7a177e4..76e1dfd 100644 (file)
--- a/src/hb-glib.cc
+++ b/src/hb-glib.cc
@@ -36,6 +36,7 @@
 
 HB_BEGIN_DECLS
 
+#if !GLIB_CHECK_VERSION(2,29,14)
 static const hb_script_t
 glib_script_to_script[] =
 {
@@ -148,10 +149,14 @@ glib_script_to_script[] =
   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];
 
@@ -159,11 +164,15 @@ hb_glib_script_to_script (GUnicodeScript script)
     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)
@@ -173,6 +182,7 @@ hb_glib_script_from_script (hb_script_t script)
     return G_UNICODE_SCRIPT_INVALID_CODE;
 
   return G_UNICODE_SCRIPT_UNKNOWN;
+#endif
 }
 
 
@@ -234,6 +244,9 @@ hb_glib_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
   /* 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;
@@ -285,6 +298,16 @@ hb_glib_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
   } 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,