[Bf-blender-cvs] [3afa72b] master: BMesh: BM_loop_share_edge_check utility func

[Campbell Barton]

Commit: 3afa72b6c714d7e1f9e0414481c41c4bebcff179
Author: Campbell Barton
Date:   Sun Dec 27 22:37:12 2015 +1100
Branches: master
https://developer.blender.org/rB3afa72b6c714d7e1f9e0414481c41c4bebcff179

BMesh: BM_loop_share_edge_check utility func

===================================================================

M	source/blender/bmesh/intern/bmesh_queries.c
M	source/blender/bmesh/intern/bmesh_queries.h

===================================================================

diff --git a/source/blender/bmesh/intern/bmesh_queries.c b/source/blender/bmesh/intern/bmesh_queries.c
index 253fa95..30f4dc5 100644
--- a/source/blender/bmesh/intern/bmesh_queries.c
+++ b/source/blender/bmesh/intern/bmesh_queries.c
@@ -1275,6 +1275,16 @@ bool BM_face_share_vert_check(BMFace *f_a, BMFace *f_b)
 }
 
 /**
+ * Returns true when 2 loops share an edge (are adjacent in the face-fan)
+ */
+bool BM_loop_share_edge_check(BMLoop *l_a, BMLoop *l_b)
+{
+	BLI_assert(l_a->v == l_b->v);
+	return (ELEM(l_a->e, l_b->e, l_b->prev->e) ||
+	        ELEM(l_b->e, l_a->e, l_a->prev->e));
+}
+
+/**
  * Test if e1 shares any faces with e2
  */
 bool BM_edge_share_face_check(BMEdge *e1, BMEdge *e2)
diff --git a/source/blender/bmesh/intern/bmesh_queries.h b/source/blender/bmesh/intern/bmesh_queries.h
index a132236..10e4b9a 100644
--- a/source/blender/bmesh/intern/bmesh_queries.h
+++ b/source/blender/bmesh/intern/bmesh_queries.h
@@ -151,6 +151,7 @@ bool    BM_face_share_face_check(BMFace *f_a, BMFace *f_b) ATTR_WARN_UNUSED_RESU
 bool    BM_face_share_edge_check(BMFace *f_a, BMFace *f_b) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
 bool    BM_face_share_vert_check(BMFace *f_a, BMFace *f_b) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
 
+bool    BM_loop_share_edge_check(BMLoop *l_a, BMLoop *l_b) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
 
 bool    BM_edge_share_face_check(BMEdge *e1, BMEdge *e2) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
 bool    BM_edge_share_quad_check(BMEdge *e1, BMEdge *e2) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();