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, 28 insertions, 1 deletions

diff --git a/source/blender/sequencer/SEQ_sequencer.h b/source/blender/sequencer/SEQ_sequencer.h
index 11e213d842d..a024d5e10d3 100644
--- a/source/blender/sequencer/SEQ_sequencer.h
+++ b/source/blender/sequencer/SEQ_sequencer.h
@@ -161,7 +161,7 @@ void SEQ_render_new_render_data(struct Main *bmain,
                                 int preview_render_size,
                                 int for_render,
                                 SeqRenderData *r_context);
-int SEQ_render_evaluate_frame(struct Scene *scene, int timeline_frame);
+int SEQ_render_evaluate_frame(struct ListBase *seqbase, int timeline_frame);
 struct StripElem *SEQ_render_give_stripelem(struct Sequence *seq, int timeline_frame);
 
 /* **********************************************************************
@@ -595,6 +595,33 @@ struct Sequence *SEQ_edit_strip_split(struct Main *bmain,
                                       struct Sequence *seq,
                                       const int timeline_frame,
                                       const eSeqSplitMethod method);
+bool SEQ_edit_remove_gaps(struct Scene *scene,
+                          struct ListBase *seqbase,
+                          const int initial_frame,
+                          const bool remove_all_gaps);
+
+/* **********************************************************************
+ * strip_time.c
+ *
+ * Editing functions
+ * **********************************************************************
+ */
+
+void SEQ_timeline_boundbox(const struct Scene *scene,
+                           const struct ListBase *seqbase,
+                           struct rctf *rect);
+
+/* **********************************************************************
+ * strip_transform.c
+ *
+ * Editing functions
+ * **********************************************************************
+ */
+
+void SEQ_offset_after_frame(struct Scene *scene,
+                            struct ListBase *seqbase,
+                            const int delta,
+                            const int timeline_frame);
 
 #ifdef __cplusplus
 }