Sequencer: clear cache and animation buffers for strips outside of cursor when rendering

This avoids having bunch of cached images when doing animation rendering,
keeping all the memory available for rendered itself.

This keeps memory usage low when rendering huge edits with mixed
scenes and movie strips.

This should not affect on sped of video encoding, which was confirmed by
some own tests.

--
svn merge -r50051:50052 ^/branches/soc-2011-tomato

1 files changed, 9 insertions, 28 deletions

diff --git a/source/blender/blenkernel/intern/sequencer.c b/source/blender/blenkernel/intern/sequencer.c
index 07c8da2837e..2596bf57f05 100644
--- a/source/blender/blenkernel/intern/sequencer.c
+++ b/source/blender/blenkernel/intern/sequencer.c
@@ -2993,46 +2993,27 @@ void BKE_sequence_invalidate_cache_for_modifier(Scene *scene, Sequence *seq)
 	sequence_invalidate_cache(scene, seq, TRUE, FALSE);
 }
 
-void BKE_sequencer_free_imbuf(Scene *scene, ListBase *seqbase, int check_mem_usage, int keep_file_handles)
+void BKE_sequencer_free_imbuf(Scene *scene, ListBase *seqbase, int for_render)
 {
 	Sequence *seq;
 
-	if (check_mem_usage) {
-		/* Let the cache limitor take care of this (schlaile) */
-		/* While render let's keep all memory available for render 
-		 * (ton)
-		 * At least if free memory is tight...
-		 * This can make a big difference in encoding speed
-		 * (it is around 4 times(!) faster, if we do not waste time
-		 * on freeing _all_ buffers every time on long timelines...)
-		 * (schlaile)
-		 */
-	
-		uintptr_t mem_in_use;
-		uintptr_t mmap_in_use;
-		uintptr_t max;
-	
-		mem_in_use = MEM_get_memory_in_use();
-		mmap_in_use = MEM_get_mapped_memory_in_use();
-		max = MEM_CacheLimiter_get_maximum();
-	
-		if (max == 0 || mem_in_use + mmap_in_use <= max) {
-			return;
-		}
-	}
-
 	BKE_sequencer_cache_cleanup();
-	
+
 	for (seq = seqbase->first; seq; seq = seq->next) {
+		if (for_render && CFRA >= seq->startdisp && CFRA <= seq->enddisp) {
+			continue;
+		}
+
 		if (seq->strip) {
-			if (seq->type == SEQ_TYPE_MOVIE && !keep_file_handles)
+			if (seq->type == SEQ_TYPE_MOVIE) {
 				free_anim_seq(seq);
+			}
 			if (seq->type == SEQ_TYPE_SPEED) {
 				BKE_sequence_effect_speed_rebuild_map(scene, seq, 1);
 			}
 		}
 		if (seq->type == SEQ_TYPE_META) {
-			BKE_sequencer_free_imbuf(scene, &seq->seqbase, FALSE, keep_file_handles);
+			BKE_sequencer_free_imbuf(scene, &seq->seqbase, for_render);
 		}
 		if (seq->type == SEQ_TYPE_SCENE) {
 			/* FIXME: recurs downwards,