Masking support for motion tracks

Added option to use Grease Pencil datablock as a mask for pattern
when doing motion tracking. Option could be found in Tracking Settings
panel.

All strokes would be rasterized separately from each other and every
stroke is treating as a closed spline.

Also added option to apply a mask on track preview which is situated
just after B/B/W channel button under track preview.

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/editors/space_clip/space_clip.c b/source/blender/editors/space_clip/space_clip.c
index 534ab8eeb95..9a8e0de3e84 100644
--- a/source/blender/editors/space_clip/space_clip.c
+++ b/source/blender/editors/space_clip/space_clip.c
@@ -215,6 +215,15 @@ static void clip_scopes_tag_refresh(ScrArea *sa)
 	sc->scopes.ok = FALSE;
 }
 
+static void clip_scopes_check_gpencil_change(ScrArea *sa)
+{
+	SpaceClip *sc = (SpaceClip *)sa->spacedata.first;
+
+	if (sc->gpencil_src == SC_GPENCIL_SRC_TRACK) {
+		clip_scopes_tag_refresh(sa);
+	}
+}
+
 static void clip_stabilization_tag_refresh(ScrArea *sa)
 {
 	SpaceClip *sc = (SpaceClip *) sa->spacedata.first;
@@ -400,6 +409,7 @@ static void clip_listener(ScrArea *sa, wmNotifier *wmn)
 			switch (wmn->data) {
 				case ND_ANIMPLAY:
 				case ND_GPENCIL:
+					clip_scopes_check_gpencil_change(sa);
 					ED_area_tag_redraw(sa);
 					break;
 			}