[arabic] Implement Unicode Arabic Mark Ordering Algorithm UTR#53
Fixes https://github.com/behdad/harfbuzz/issues/509
diff --git a/src/hb-ot-shape-complex-private.hh b/src/hb-ot-shape-complex-private.hh
index 8fadd7c..9792067 100644
--- a/src/hb-ot-shape-complex-private.hh
+++ b/src/hb-ot-shape-complex-private.hh
@@ -39,6 +39,8 @@
#define complex_var_u8_1() var2.u8[3]
+#define HB_OT_SHAPE_COMPLEX_MAX_COMBINING_MARKS 32
+
enum hb_ot_shape_zero_width_marks_type_t {
HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY,
@@ -154,6 +156,16 @@
*/
bool (*disable_otl) (const hb_ot_shape_plan_t *plan);
+ /* reorder_marks()
+ * Called during shape().
+ * Shapers can use to modify ordering of combining marks.
+ * May be NULL.
+ */
+ void (*reorder_marks) (const hb_ot_shape_plan_t *plan,
+ hb_buffer_t *buffer,
+ unsigned int start,
+ unsigned int end);
+
hb_ot_shape_zero_width_marks_type_t zero_width_marks;
bool fallback_position;
