Roll harfbuzz-ng 3b8fd9c48f4bde368bf2d465c148b9743a9216ee

third_party/harfbuzz-ng/src/hb-unicode-private.hh

 /*
  * Copyright © 2009  Red Hat, Inc.
  * Copyright © 2011  Codethink Limited
  * Copyright © 2010,2011  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
@@ skipping 79 matching lines @@
 };
 
 
 #ifdef HAVE_GLIB
 extern HB_INTERNAL hb_unicode_funcs_t _hb_glib_unicode_funcs;
 #define _hb_unicode_funcs_default _hb_glib_unicode_funcs
 #elif defined(HAVE_ICU)
 extern HB_INTERNAL hb_unicode_funcs_t _hb_icu_unicode_funcs;
 #define _hb_unicode_funcs_default _hb_icu_unicode_funcs
 #else
+#define HB_UNICODE_FUNCS_NIL 1
 extern HB_INTERNAL hb_unicode_funcs_t _hb_unicode_funcs_nil;
 #define _hb_unicode_funcs_default _hb_unicode_funcs_nil
 #endif
 
 
+HB_INTERNAL unsigned int
+_hb_unicode_modified_combining_class (hb_unicode_funcs_t *ufuncs,
+                                      hb_codepoint_t      unicode);
 
+static inline hb_bool_t
+_hb_unicode_is_variation_selector (hb_codepoint_t unicode)
+{
+  return unlikely ((unicode >=  0x180B && unicode <=  0x180D) || /* MONGOLIAN FREE VARIATION SELECTOR ONE..THREE */
+                   (unicode >=  0xFE00 && unicode <=  0xFE0F) || /* VARIATION SELECTOR-1..16 */
+                   (unicode >= 0xE0100 && unicode <= 0xE01EF));  /* VARIATION SELECTOR-17..256 */
+}
+
+/* Zero-Width invisible characters:
+ *
+ *  00AD  SOFT HYPHEN
+ *  034F  COMBINING GRAPHEME JOINER
+ *
+ *  200B  ZERO WIDTH SPACE
+ *  200C  ZERO WIDTH NON-JOINER
+ *  200D  ZERO WIDTH JOINER
+ *  200E  LEFT-TO-RIGHT MARK
+ *  200F  RIGHT-TO-LEFT MARK
+ *
+ *  2028  LINE SEPARATOR
+ *
+ *  202A  LEFT-TO-RIGHT EMBEDDING
+ *  202B  RIGHT-TO-LEFT EMBEDDING
+ *  202C  POP DIRECTIONAL FORMATTING
+ *  202D  LEFT-TO-RIGHT OVERRIDE
+ *  202E  RIGHT-TO-LEFT OVERRIDE
+ *
+ *  2060  WORD JOINER
+ *  2061  FUNCTION APPLICATION
+ *  2062  INVISIBLE TIMES
+ *  2063  INVISIBLE SEPARATOR
+ *
+ *  FEFF  ZERO WIDTH NO-BREAK SPACE
+ */
+static inline hb_bool_t
+_hb_unicode_is_zero_width (hb_codepoint_t ch)
+{
+  return ((ch & ~0x007F) == 0x2000 && (
+          (ch >= 0x200B && ch <= 0x200F) ||
+          (ch >= 0x202A && ch <= 0x202E) ||
+          (ch >= 0x2060 && ch <= 0x2063) ||
+          (ch == 0x2028)
+         )) || unlikely (ch == 0x0009
+                      || ch == 0x00AD
+                      || ch == 0x034F
+                      || ch == 0xFEFF);
+}
 
 #endif /* HB_UNICODE_PRIVATE_HH */