Math Lib: rotate matrix cleanup

- Remove 'rotate_m2', unlike 'rotate_m4' it created a new matrix
  duplicating 'angle_to_mat2' - now used instead.
  (better avoid matching functions having different behavior).

- Add 'axis_angle_to_mat4_single',
  convenience wrapper for 'axis_angle_to_mat3_single'.

- Replace 'unit_m4(), rotate_m4()' with a single call to 'axis_angle_to_mat4_single'.

2 files changed, 3 insertions, 4 deletions

diff --git a/source/blender/blenkernel/intern/object_dupli.c b/source/blender/blenkernel/intern/object_dupli.c
index 14cc5ec0849..e3b801b3193 100644
--- a/source/blender/blenkernel/intern/object_dupli.c
+++ b/source/blender/blenkernel/intern/object_dupli.c
@@ -642,8 +642,7 @@ static void make_duplis_font(const DupliContext *ctx)
 				float rmat[4][4];
 
 				zero_v3(obmat[3]);
-				unit_m4(rmat);
-				rotate_m4(rmat, 'Z', -ct->rot);
+				axis_angle_to_mat4_single(rmat, 'Z', -ct->rot);
 				mul_m4_m4m4(obmat, obmat, rmat);
 			}
 
diff --git a/source/blender/blenkernel/intern/tracking_stabilize.c b/source/blender/blenkernel/intern/tracking_stabilize.c
index b8949f9a0de..36b24fbb2dc 100644
--- a/source/blender/blenkernel/intern/tracking_stabilize.c
+++ b/source/blender/blenkernel/intern/tracking_stabilize.c
@@ -587,7 +587,7 @@ static void compensate_rotation_center(const int size, float aspect,
 
 	copy_v2_v2(intended_pivot, pivot);
 	copy_v2_v2(rotated_pivot, pivot);
-	rotate_m2(rotation_mat, +angle);
+	angle_to_mat2(rotation_mat, +angle);
 	sub_v2_v2(rotated_pivot, origin);
 	mul_m2v2(rotation_mat, rotated_pivot);
 	mul_v2_fl(rotated_pivot, scale);
@@ -967,7 +967,7 @@ static void initialize_track_for_stabilization(StabContext *ctx,
 
 	pos[0] *= aspect;
 	angle = average_angle - atan2f(pos[1],pos[0]);
-	rotate_m2(local_data->stabilization_rotation_base, angle);
+	angle_to_mat2(local_data->stabilization_rotation_base, angle);
 
 	/* Per track baseline value for zoom. */
 	len = len_v2(pos) + SCALE_ERROR_LIMIT_BIAS;