VSE: Improved Snapping

Change snapping behavior to snap strip edges when they are close to snap point.
Default behavior is, that each transformed strip is snapped to any other strip.

Implement snapping controls in sequencer tool settings. These controls include:

 - Snapping on/off
 - Ability to snap to playhead and strip hold offset points
 - Filter snap points by excluding sound or muted strips
 - Control snapping distance

Snapping controls are placed in timeline header similar to 3D viewport

Reviewed By: mano-wii

Differential Revision: https://developer.blender.org/D11646

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/sequencer/SEQ_sequencer.h b/source/blender/sequencer/SEQ_sequencer.h
index fd4181a5a54..706f4064bf3 100644
--- a/source/blender/sequencer/SEQ_sequencer.h
+++ b/source/blender/sequencer/SEQ_sequencer.h
@@ -55,6 +55,9 @@ struct SequencerToolSettings *SEQ_tool_settings_ensure(struct Scene *scene);
 void SEQ_tool_settings_free(struct SequencerToolSettings *tool_settings);
 eSeqImageFitMethod SEQ_tool_settings_fit_method_get(struct Scene *scene);
 void SEQ_tool_settings_fit_method_set(struct Scene *scene, eSeqImageFitMethod fit_method);
+short SEQ_tool_settings_snap_flag_get(struct Scene *scene);
+short SEQ_tool_settings_snap_mode_get(struct Scene *scene);
+int SEQ_tool_settings_snap_distance_get(struct Scene *scene);
 struct SequencerToolSettings *SEQ_tool_settings_copy(struct SequencerToolSettings *tool_settings);
 struct Editing *SEQ_editing_get(struct Scene *scene, bool alloc);
 struct Editing *SEQ_editing_ensure(struct Scene *scene);