Add foreach_syllable
Use it in USE.
diff --git a/src/hb-ot-layout-private.hh b/src/hb-ot-layout-private.hh
index 7a8e2bf..3a482ff 100644
--- a/src/hb-ot-layout-private.hh
+++ b/src/hb-ot-layout-private.hh
@@ -179,6 +179,30 @@
#define lig_props() var1.u8[2] /* GSUB/GPOS ligature tracking */
#define syllable() var1.u8[3] /* GSUB/GPOS shaping boundaries */
+
+/* loop over syllables */
+
+#define foreach_syllable(buffer, start, end) \
+ for (unsigned int \
+ _count = buffer->len, \
+ start = 0, end = _count ? _next_syllable (buffer, 0) : 0; \
+ start < _count; \
+ start = end, end = _next_syllable (buffer, start))
+
+static inline unsigned int
+_next_syllable (hb_buffer_t *buffer, unsigned int start)
+{
+ hb_glyph_info_t *info = buffer->info;
+ unsigned int count = buffer->len;
+
+ unsigned int syllable = info[start].syllable();
+ while (++start < count && syllable == info[start].syllable())
+ ;
+
+ return start;
+}
+
+
/* unicode_props */
enum {
