VSE: Cache rewrite

This patch implements new cache system.
Aim is to give user more control over cache, so it can be maximally
utilized. This is done through sequencer timeline side panel
in category proxy & cache.
Cached images are also visualized in timeline, controled by
sequencer timeline view->cache menu

Functional changes:
 - NOT use IMB_moviecache API
 - refactor names of cached image types
 - each scene owns 1 sequencer cache
 - merge preprocess cache into per-sequencer cache
 - cache links images rendered per frame in order as they are created
 - add cache content visualization tool
 - add RNA properties to control the cache

More info can be found in design notes in blenkernel/intern/seqcache.c
and in https://developer.blender.org/D4443

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4443

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/imbuf/IMB_imbuf.h b/source/blender/imbuf/IMB_imbuf.h
index bdc1abf3132..f8df14cf317 100644
--- a/source/blender/imbuf/IMB_imbuf.h
+++ b/source/blender/imbuf/IMB_imbuf.h
@@ -173,6 +173,13 @@ bool addzbufImBuf(struct ImBuf *ibuf);
 bool addzbuffloatImBuf(struct ImBuf *ibuf);
 
 /**
+ * Approximate size of ImBuf in memory
+ *
+ * \attention Defined in allocimbuf.c
+ */
+size_t IMB_get_size_in_memory(struct ImBuf *ibuf);
+
+/**
  *
  * \attention Defined in rectop.c
  */