Fix ChanContext backtrack matching with GPOS
Reported on mailing list by Keith Stribley and Khaled Hosny.
diff --git a/src/hb-buffer-private.hh b/src/hb-buffer-private.hh
index a129165..d8834c5 100644
--- a/src/hb-buffer-private.hh
+++ b/src/hb-buffer-private.hh
@@ -99,7 +99,7 @@
unsigned int i; /* Cursor into ->info and ->pos arrays */
unsigned int len; /* Length of ->info and ->pos arrays */
- unsigned int out_len; /* Length of ->out array */
+ unsigned int out_len; /* Length of ->out array if have_output */
hb_glyph_info_t *info;
hb_glyph_info_t *out_info;
@@ -111,6 +111,8 @@
/* Methods */
+ inline unsigned int backtrack_len (void) const
+ { return this->have_output? this->out_len : this->i; }
inline unsigned int next_serial (void) { return serial++; }
inline void swap (void) { _hb_buffer_swap (this); }
inline void clear_output (void) { _hb_buffer_clear_output (this); }
@@ -137,7 +139,6 @@
unsigned int cluster_start,
unsigned int cluster_end)
{ _hb_buffer_set_masks (this, value, mask, cluster_start, cluster_end); }
-
};
