== Sequencer ==

This patch cleans up the sequencer core by replacing the caching system
(TStripElems) with a hash based system, which is:

a) a lot faster
b) a lot more readable
c) a lot more memory conserving

The new caching system is also a good building ground for

a) sub frame precision rendering (even on scene strips)
b) multi core rendering (threaded rendering is still disabled, but can 
   be extended now to arbitrary core numbers)

I tested the code on an extensive editing session today and had no 
crashes during 4 hours of editing. So I consider it very stable.

1 files changed, 22 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_sequencer.h b/source/blender/blenkernel/BKE_sequencer.h
index c5417e04780..81ae83cafb6 100644
--- a/source/blender/blenkernel/BKE_sequencer.h
+++ b/source/blender/blenkernel/BKE_sequencer.h
@@ -164,6 +164,28 @@ struct StripElem *give_stripelem(struct Sequence *seq, int cfra);
 // intern?
 void update_changed_seq_and_deps(struct Scene *scene, struct Sequence *changed_seq, int len_change, int ibuf_change);
 
+/* seqcache.c */
+
+typedef enum {
+	SEQ_STRIPELEM_IBUF,
+	SEQ_STRIPELEM_IBUF_COMP,
+	SEQ_STRIPELEM_IBUF_STARTSTILL,
+	SEQ_STRIPELEM_IBUF_ENDSTILL
+} seq_stripelem_ibuf_t;
+
+void seq_stripelem_cache_init();
+void seq_stripelem_cache_destruct();
+
+void seq_stripelem_cache_cleanup();
+
+struct ImBuf * seq_stripelem_cache_get(
+	struct Sequence * seq, int rectx, int recty, 
+	float cfra, seq_stripelem_ibuf_t type);
+void seq_stripelem_cache_put(
+	struct Sequence * seq, int rectx, int recty, 
+	float cfra, seq_stripelem_ibuf_t type, struct ImBuf * nval);
+
+
 /* seqeffects.c */
 // intern?
 struct SeqEffectHandle get_sequence_blend(struct Sequence *seq);