Add hb_ot_layout_ensure() and hb_uniscribe_font_ensure()
diff --git a/src/hb-shaper-private.hh b/src/hb-shaper-private.hh
index e50d869..186318d 100644
--- a/src/hb-shaper-private.hh
+++ b/src/hb-shaper-private.hh
@@ -86,5 +86,23 @@
object->shaper_data.shaper != HB_SHAPER_DATA_SUCCEEDED) \
HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA (shaper, object));
+#define HB_SHAPER_DATA_ENSURE_DECLARE(shaper, object) \
+static inline bool \
+hb_##shaper##_shaper_##object##_data_ensure (hb_##object##_t *object) \
+{\
+ retry: \
+ HB_SHAPER_DATA_TYPE (shaper, object) *data = (HB_SHAPER_DATA_TYPE (shaper, object) *) hb_atomic_ptr_get (&HB_SHAPER_DATA (shaper, object)); \
+ if (unlikely (!data)) { \
+ data = HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (object); \
+ if (unlikely (!data)) \
+ data = (HB_SHAPER_DATA_TYPE (shaper, object) *) HB_SHAPER_DATA_INVALID; \
+ if (!hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), NULL, data)) { \
+ HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \
+ goto retry; \
+ } \
+ } \
+ return data != NULL && !HB_SHAPER_DATA_IS_INVALID (data); \
+}
+
#endif /* HB_SHAPER_PRIVATE_HH */
