Fix T68700: Incorrect 'absolute' timing of animated masks in the Video

Sequence Editor

Code in 'seq_render_mask' will effectively do
BKE_mask_evaluate(mask_temp, mask->sfra + (cfra - fra_offset), true)
where 'fra_offset' is zero for absolute and seq->start for relative.

If we really want the scene's current frame (as advertised) if Mask Time
is set to Absolute (effectively ignoring the Mask Settings start/end) we
need to change the fra_offset from zero to mask->sfra.

Also BKE_animsys_evaluate_animdata should take mask->sfra into account
as well (otherwise mask animation [points] and other animation [e.g.
opacity] will run out of sync)

Reviewers: campbellbarton, ISS

Maniphest Tasks: T68700

Differential Revision: https://developer.blender.org/D5495

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/blenkernel/intern/sequencer.c b/source/blender/blenkernel/intern/sequencer.c
index 3e88db787ee..6f7a48ce16b 100644
--- a/source/blender/blenkernel/intern/sequencer.c
+++ b/source/blender/blenkernel/intern/sequencer.c
@@ -3340,7 +3340,7 @@ static ImBuf *seq_render_mask(const SeqRenderData *context, Mask *mask, float nr
 
     /* anim-data */
     adt = BKE_animdata_from_id(&mask->id);
-    BKE_animsys_evaluate_animdata(context->scene, &mask_temp->id, adt, nr, ADT_RECALC_ANIM, false);
+    BKE_animsys_evaluate_animdata(context->scene, &mask_temp->id, adt, mask->sfra + nr, ADT_RECALC_ANIM, false);
 
     maskbuf = MEM_mallocN(sizeof(float) * context->rectx * context->recty, __func__);