Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz-ng/src/hb-ot-layout-common-private.hh

Index: third_party/harfbuzz-ng/src/hb-ot-layout-common-private.hh
diff --git a/third_party/harfbuzz-ng/src/hb-ot-layout-common-private.hh b/third_party/harfbuzz-ng/src/hb-ot-layout-common-private.hh
index 9ff5ca975b666d054edd1a1dc9d10a6989d4fc63..5d19e08fba9a4d1d53c2471a45f836187751e802 100644
--- a/third_party/harfbuzz-ng/src/hb-ot-layout-common-private.hh
+++ b/third_party/harfbuzz-ng/src/hb-ot-layout-common-private.hh
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2007,2008,2009  Red Hat, Inc.
- * Copyright (C) 2010  Google, Inc.
+ * Copyright © 2007,2008,2009  Red Hat, Inc.
+ * Copyright © 2010  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
@@ -38,8 +38,6 @@
 #define NOT_COVERED		((unsigned int) 0x110000)
 #define MAX_NESTING_LEVEL	8
 
-HB_BEGIN_DECLS
-HB_END_DECLS
 
 
 /*
@@ -89,10 +87,10 @@ struct RecordArrayOf : SortedArrayOf<Record<Type> > {
 				hb_tag_t     *record_tags /* OUT */) const
   {
     if (record_count) {
-      const Record<Type> *array = this->sub_array (start_offset, record_count);
+      const Record<Type> *arr = this->sub_array (start_offset, record_count);
       unsigned int count = *record_count;
       for (unsigned int i = 0; i < count; i++)
-	record_tags[i] = array[i].tag;
+	record_tags[i] = arr[i].tag;
     }
     return this->len;
   }
@@ -150,10 +148,10 @@ struct IndexArray : ArrayOf<Index>
 				   unsigned int *_indexes /* OUT */) const
   {
     if (_count) {
-      const USHORT *array = this->sub_array (start_offset, _count);
+      const USHORT *arr = this->sub_array (start_offset, _count);
       unsigned int count = *_count;
       for (unsigned int i = 0; i < count; i++)
-	_indexes[i] = array[i];
+	_indexes[i] = arr[i];
     }
     return this->len;
   }
@@ -526,13 +524,13 @@ struct ClassDef
 struct Device
 {
 
-  inline hb_position_t get_x_delta (hb_ot_layout_context_t *c) const
-  { return get_delta (c->font->x_ppem, c->font->x_scale); }
+  inline hb_position_t get_x_delta (hb_font_t *font) const
+  { return get_delta (font->x_ppem, font->x_scale); }
 
-  inline hb_position_t get_y_delta (hb_ot_layout_context_t *c) const
-  { return get_delta (c->font->y_ppem, c->font->y_scale); }
+  inline hb_position_t get_y_delta (hb_font_t *font) const
+  { return get_delta (font->y_ppem, font->y_scale); }
 
-  inline int get_delta (unsigned int ppem, unsigned int scale) const
+  inline int get_delta (unsigned int ppem, int scale) const
   {
     if (!ppem) return 0;
 
@@ -540,10 +538,6 @@ struct Device
 
     if (!pixels) return 0;
 
-    /* pixels is at most in the -8..7 range.  So 64-bit arithmetic is
-     * not really necessary here.  A simple cast to int may just work
-     * as well.  But since this code is not reached that often and
-     * for the sake of correctness, we do a 64bit operation. */
     return pixels * (int64_t) scale / ppem;
   }
 
@@ -598,7 +592,5 @@ struct Device
 };
 
 
-HB_BEGIN_DECLS
-HB_END_DECLS
 
 #endif /* HB_OT_LAYOUT_COMMON_PRIVATE_HH */