Tracking: Fix usage PLACEHOLDER function

Don't use BKE_view_layer_context_active_PLACEHOLDER which is marked
as "never use this".

In fact, it isn't needed to lookup for camera in the tracking function
at all: camera object is always explicitly passed to it.

3 files changed, 5 insertions, 20 deletions

diff --git a/source/blender/blenkernel/BKE_tracking.h b/source/blender/blenkernel/BKE_tracking.h
index c64d684de5a..2091078fd30 100644
--- a/source/blender/blenkernel/BKE_tracking.h
+++ b/source/blender/blenkernel/BKE_tracking.h
@@ -56,9 +56,7 @@ struct MovieTrackingReconstruction *BKE_tracking_get_active_reconstruction(
     struct MovieTracking *tracking);
 
 /* matrices for constraints and drawing */
-void BKE_tracking_get_camera_object_matrix(struct Scene *scene,
-                                           struct Object *ob,
-                                           float mat[4][4]);
+void BKE_tracking_get_camera_object_matrix(struct Object *ob, float mat[4][4]);
 void BKE_tracking_get_projection_matrix(struct MovieTracking *tracking,
                                         struct MovieTrackingObject *object,
                                         int framenr,
diff --git a/source/blender/blenkernel/intern/constraint.c b/source/blender/blenkernel/intern/constraint.c
index 708d0600e91..229578a38b7 100644
--- a/source/blender/blenkernel/intern/constraint.c
+++ b/source/blender/blenkernel/intern/constraint.c
@@ -4611,7 +4611,7 @@ static void followtrack_evaluate(bConstraint *con, bConstraintOb *cob, ListBase
             cob->matrix, track->bundle_pos[0], track->bundle_pos[1], track->bundle_pos[2]);
       }
       else {
-        BKE_tracking_get_camera_object_matrix(cob->scene, camob, mat);
+        BKE_tracking_get_camera_object_matrix(camob, mat);
 
         mul_m4_m4m4(cob->matrix, obmat, mat);
         translate_m4(
diff --git a/source/blender/blenkernel/intern/tracking.c b/source/blender/blenkernel/intern/tracking.c
index 86fb2ab58bc..731051f2f34 100644
--- a/source/blender/blenkernel/intern/tracking.c
+++ b/source/blender/blenkernel/intern/tracking.c
@@ -395,23 +395,10 @@ MovieTrackingReconstruction *BKE_tracking_get_active_reconstruction(MovieTrackin
 /* Get transformation matrix for a given object which is used
  * for parenting motion tracker reconstruction to 3D world.
  */
-void BKE_tracking_get_camera_object_matrix(Scene *scene, Object *ob, float mat[4][4])
+void BKE_tracking_get_camera_object_matrix(Object *ob, float mat[4][4])
 {
-  if (!ob) {
-    if (scene->camera) {
-      ob = scene->camera;
-    }
-    else {
-      ob = BKE_view_layer_camera_find(BKE_view_layer_context_active_PLACEHOLDER(scene));
-    }
-  }
-
-  if (ob) {
-    BKE_object_where_is_calc_mat4(ob, mat);
-  }
-  else {
-    unit_m4(mat);
-  }
+  BLI_assert(ob != NULL);
+  BKE_object_where_is_calc_mat4(ob, mat);
 }
 
 /* Get projection matrix for camera specified by given tracking object