NLA SoC: Start of 'Meta' Strips

Refactored the backend code/API's to support 'meta' strips (i.e. strips containing other strips). These have been implemented to be nested to 'unlimited' depths (in terms of common usages that is, though there is a very remote chance of stack-overflow in theoretrical evil cases only that shouldn't ever be encountered in production).

This paves the way for implementing the necessary tweaks needed for the transform code (in addition to some cool user-level tricks)

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_nla.h b/source/blender/blenkernel/BKE_nla.h
index e2b1dd89deb..efa0591bd53 100644
--- a/source/blender/blenkernel/BKE_nla.h
+++ b/source/blender/blenkernel/BKE_nla.h
@@ -53,6 +53,13 @@ struct NlaStrip *add_nlastrip_to_stack(struct AnimData *adt, struct bAction *act
 /* ----------------------------- */
 /* API */
 
+short BKE_nlastrips_has_space(ListBase *strips, float start, float end);
+void BKE_nlastrips_sort_strips(ListBase *strips);
+
+short BKE_nlastrips_add_strip(ListBase *strips, struct NlaStrip *strip);
+
+/* ............ */
+
 struct NlaTrack *BKE_nlatrack_find_active(ListBase *tracks);
 void BKE_nlatrack_set_active(ListBase *tracks, struct NlaTrack *nlt);
 
@@ -63,6 +70,7 @@ void BKE_nlatrack_sort_strips(struct NlaTrack *nlt);
 
 short BKE_nlatrack_add_strip(struct NlaTrack *nlt, struct NlaStrip *strip);
 
+/* ............ */
 
 struct NlaStrip *BKE_nlastrip_find_active(struct NlaTrack *nlt);
 short BKE_nlastrip_within_bounds(struct NlaStrip *strip, float min, float max);