Add a few more buffer convenience methods
diff --git a/src/hb-buffer-private.hh b/src/hb-buffer-private.hh
index 73bae80..db67f81 100644
--- a/src/hb-buffer-private.hh
+++ b/src/hb-buffer-private.hh
@@ -130,6 +130,18 @@
   inline void swap (void) { _hb_buffer_swap (this); }
   inline void clear_output (void) { _hb_buffer_clear_output (this); }
   inline void next_glyph (void) { _hb_buffer_next_glyph (this); }
+  inline void add_output_glyphs (unsigned int num_in,
+				 unsigned int num_out,
+				 const hb_codepoint_t *glyph_data,
+				 unsigned short component,
+				 unsigned short ligID)
+  { _hb_buffer_add_output_glyphs (this, num_in, num_out, glyph_data, component, ligID); }
+  inline void add_output_glyphs_be16 (unsigned int num_in,
+				      unsigned int num_out,
+				      const uint16_t *glyph_data_be,
+				      unsigned short component,
+				      unsigned short ligID)
+  { _hb_buffer_add_output_glyphs_be16 (this, num_in, num_out, glyph_data_be, component, ligID); }
   inline void add_output_glyph (hb_codepoint_t glyph_index,
 				unsigned short component = 0xFFFF,
 				unsigned short ligID = 0xFFFF)
diff --git a/src/hb-ot-layout-gsub-private.hh b/src/hb-ot-layout-gsub-private.hh
index 9a4b2e8..2b5919e 100644
--- a/src/hb-ot-layout-gsub-private.hh
+++ b/src/hb-ot-layout-gsub-private.hh
@@ -166,9 +166,9 @@
     if (unlikely (!substitute.len))
       return false;
 
-    _hb_buffer_add_output_glyphs_be16 (context->buffer, 1,
-				       substitute.len, (const uint16_t *) substitute.array,
-				       0xFFFF, 0xFFFF);
+    context->buffer->add_output_glyphs_be16 (1,
+					     substitute.len, (const uint16_t *) substitute.array,
+					     0xFFFF, 0xFFFF);
 
     /* This is a guess only ... */
     if (_hb_ot_layout_has_new_glyph_classes (context->layout->face))
@@ -400,15 +400,15 @@
     if (j == context->buffer->in_pos + i) /* No input glyphs skipped */
       /* We don't use a new ligature ID if there are no skipped
 	 glyphs and the ligature already has an ID. */
-      _hb_buffer_add_output_glyphs_be16 (context->buffer, i,
-					 1, (const uint16_t *) &ligGlyph,
-					 0,
-					 IN_LIGID (context->buffer->in_pos) && !IN_COMPONENT (context->buffer->in_pos) ?
-					 0xFFFF : context->buffer->allocate_lig_id ());
+      context->buffer->add_output_glyphs_be16 (i,
+					       1, (const uint16_t *) &ligGlyph,
+					       0,
+					       IN_LIGID (context->buffer->in_pos) && !IN_COMPONENT (context->buffer->in_pos) ?
+					       0xFFFF : context->buffer->allocate_lig_id ());
     else
     {
       unsigned int lig_id = context->buffer->allocate_lig_id ();
-      _hb_buffer_add_output_glyph (context->buffer, ligGlyph, 0xFFFF, lig_id);
+      context->buffer->add_output_glyph (ligGlyph, 0xFFFF, lig_id);
 
       /* Now we must do a second loop to copy the skipped glyphs to
 	 `out' and assign component values to it.  We start with the
@@ -420,7 +420,7 @@
       for ( i = 1; i < count; i++ )
       {
 	while (_hb_ot_layout_skip_mark (context->layout->face, IN_CURINFO (), context->lookup_flag, NULL))
-	  _hb_buffer_add_output_glyph (context->buffer, IN_CURGLYPH (), i, lig_id);
+	  context->buffer->add_output_glyph (IN_CURGLYPH (), i, lig_id);
 
 	(context->buffer->in_pos)++;
       }