Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz-ng/src/hb-buffer.h

Index: third_party/harfbuzz-ng/src/hb-buffer.h
diff --git a/third_party/harfbuzz-ng/src/hb-buffer.h b/third_party/harfbuzz-ng/src/hb-buffer.h
index 0185415c46e373856086002900b3e96147934fcc..9582ebee49941bbe8c5c80f294e59d2ccbe44419 100644
--- a/third_party/harfbuzz-ng/src/hb-buffer.h
+++ b/third_party/harfbuzz-ng/src/hb-buffer.h
@@ -1,8 +1,9 @@
 /*
- * Copyright (C) 1998-2004  David Turner and Werner Lemberg
- * Copyright (C) 2004,2007,2009  Red Hat, Inc.
+ * Copyright © 1998-2004  David Turner and Werner Lemberg
+ * Copyright © 2004,2007,2009  Red Hat, Inc.
+ * Copyright © 2011  Google, Inc.
  *
- * This is part of HarfBuzz, a text shaping library.
+ *  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
@@ -23,6 +24,7 @@
  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  *
  * Red Hat Author(s): Owen Taylor, Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
  */
 
 #ifndef HB_BUFFER_H
@@ -30,7 +32,6 @@
 
 #include "hb-common.h"
 #include "hb-unicode.h"
-#include "hb-language.h"
 
 HB_BEGIN_DECLS
 
@@ -41,6 +42,8 @@ typedef struct _hb_glyph_info_t {
   hb_codepoint_t codepoint;
   hb_mask_t      mask;
   uint32_t       cluster;
+
+  /*< private >*/
   hb_var_int_t   var1;
   hb_var_int_t   var2;
 } hb_glyph_info_t;
@@ -50,22 +53,35 @@ typedef struct _hb_glyph_position_t {
   hb_position_t  y_advance;
   hb_position_t  x_offset;
   hb_position_t  y_offset;
+
+  /*< private >*/
   hb_var_int_t   var;
 } hb_glyph_position_t;
 
 
 hb_buffer_t *
-hb_buffer_create (unsigned int pre_alloc_size);
+hb_buffer_create (void);
 
 hb_buffer_t *
-hb_buffer_reference (hb_buffer_t *buffer);
+hb_buffer_get_empty (void);
 
-unsigned int
-hb_buffer_get_reference_count (hb_buffer_t *buffer);
+hb_buffer_t *
+hb_buffer_reference (hb_buffer_t *buffer);
 
 void
 hb_buffer_destroy (hb_buffer_t *buffer);
 
+hb_bool_t
+hb_buffer_set_user_data (hb_buffer_t        *buffer,
+			 hb_user_data_key_t *key,
+			 void *              data,
+			 hb_destroy_func_t   destroy,
+			 hb_bool_t           replace);
+
+void *
+hb_buffer_get_user_data (hb_buffer_t        *buffer,
+			 hb_user_data_key_t *key);
+
 
 void
 hb_buffer_set_unicode_funcs (hb_buffer_t        *buffer,
@@ -96,15 +112,20 @@ hb_language_t
 hb_buffer_get_language (hb_buffer_t *buffer);
 
 
+/* Resets the buffer.  Afterwards it's as if it was just created,
+ * except that it has a larger buffer allocated perhaps... */
 void
-hb_buffer_clear (hb_buffer_t *buffer);
+hb_buffer_reset (hb_buffer_t *buffer);
+
+/* Returns FALSE if allocation failed */
+hb_bool_t
+hb_buffer_pre_allocate (hb_buffer_t  *buffer,
+		        unsigned int  size);
 
-void
-hb_buffer_clear_positions (hb_buffer_t *buffer);
 
+/* Returns FALSE if allocation has failed before */
 hb_bool_t
-hb_buffer_ensure (hb_buffer_t  *buffer,
-		  unsigned int  size);
+hb_buffer_allocation_successful (hb_buffer_t  *buffer);
 
 void
 hb_buffer_reverse (hb_buffer_t *buffer);
@@ -112,50 +133,60 @@ hb_buffer_reverse (hb_buffer_t *buffer);
 void
 hb_buffer_reverse_clusters (hb_buffer_t *buffer);
 
+void
+hb_buffer_guess_properties (hb_buffer_t *buffer);
+
 
 /* Filling the buffer in */
 
 void
-hb_buffer_add_glyph (hb_buffer_t    *buffer,
-		     hb_codepoint_t  codepoint,
-		     hb_mask_t       mask,
-		     unsigned int    cluster);
+hb_buffer_add (hb_buffer_t    *buffer,
+	       hb_codepoint_t  codepoint,
+	       hb_mask_t       mask,
+	       unsigned int    cluster);
 
 void
 hb_buffer_add_utf8 (hb_buffer_t  *buffer,
 		    const char   *text,
-		    unsigned int  text_length,
+		    int           text_length,
 		    unsigned int  item_offset,
-		    unsigned int  item_length);
+		    int           item_length);
 
 void
 hb_buffer_add_utf16 (hb_buffer_t    *buffer,
 		     const uint16_t *text,
-		     unsigned int    text_length,
+		     int             text_length,
 		     unsigned int    item_offset,
-		     unsigned int    item_length);
+		     int             item_length);
 
 void
 hb_buffer_add_utf32 (hb_buffer_t    *buffer,
 		     const uint32_t *text,
-		     unsigned int    text_length,
+		     int             text_length,
 		     unsigned int    item_offset,
-		     unsigned int    item_length);
+		     int             item_length);
 
 
-/* Getting glyphs out of the buffer */
+/* Clears any new items added at the end */
+hb_bool_t
+hb_buffer_set_length (hb_buffer_t  *buffer,
+		      unsigned int  length);
 
 /* Return value valid as long as buffer not modified */
 unsigned int
 hb_buffer_get_length (hb_buffer_t *buffer);
 
+/* Getting glyphs out of the buffer */
+
 /* Return value valid as long as buffer not modified */
 hb_glyph_info_t *
-hb_buffer_get_glyph_infos (hb_buffer_t *buffer);
+hb_buffer_get_glyph_infos (hb_buffer_t  *buffer,
+                           unsigned int *length);
 
 /* Return value valid as long as buffer not modified */
 hb_glyph_position_t *
-hb_buffer_get_glyph_positions (hb_buffer_t *buffer);
+hb_buffer_get_glyph_positions (hb_buffer_t  *buffer,
+                               unsigned int *length);
 
 
 HB_END_DECLS