VSE: Move remove gaps operator logic to module code

Logic was broken into finding gaps and ofsetting strips.
Functions were modified so they work on explicitly defined seqbase,
so they can be used as python API functions.

Functional changes:
 - Improve performance by calculating gap length and offseting strips
   at once. Previously strips were offset by one frame.
 - Calculate gap from start frame. Previously gap was considered only
   inbetween strips.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D9730

1 files changed, 9 insertions, 8 deletions

diff --git a/source/blender/sequencer/intern/render.c b/source/blender/sequencer/intern/render.c
index 008ea1cd3a0..155258dc2c3 100644
--- a/source/blender/sequencer/intern/render.c
+++ b/source/blender/sequencer/intern/render.c
@@ -337,16 +337,17 @@ static int evaluate_seq_frame_gen(Sequence **seq_arr,
   return totseq;
 }
 
-int SEQ_render_evaluate_frame(Scene *scene, int timeline_frame)
+/**
+ * Count number of strips in timeline at timeline_frame
+ *
+ * \param seqbase: ListBase in which strips are located
+ * \param timeline_frame: frame on timeline from where gaps are searched for
+ * \return number of strips
+ */
+int SEQ_render_evaluate_frame(ListBase *seqbase, int timeline_frame)
 {
-  Editing *ed = BKE_sequencer_editing_get(scene, false);
   Sequence *seq_arr[MAXSEQ + 1];
-
-  if (ed == NULL) {
-    return 0;
-  }
-
-  return evaluate_seq_frame_gen(seq_arr, ed->seqbasep, timeline_frame, 0);
+  return evaluate_seq_frame_gen(seq_arr, seqbase, timeline_frame, 0);
 }
 
 static bool video_seq_is_rendered(Sequence *seq)