minor changes to select similar,

- replace ngon_fake_area() with generic call to BM_face_calc_area().
- add defvert_find_shared() utility function.

2 files changed, 21 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_deform.h b/source/blender/blenkernel/BKE_deform.h
index 52a143ddf55..8306da71432 100644
--- a/source/blender/blenkernel/BKE_deform.h
+++ b/source/blender/blenkernel/BKE_deform.h
@@ -54,6 +54,7 @@ struct MDeformWeight    *defvert_verify_index(struct MDeformVert *dv, const int
 void                     defvert_add_index_notest(struct MDeformVert *dv, int defgroup, const float weight);
 void                     defvert_remove_group(struct MDeformVert *dvert, struct MDeformWeight *dw);
 void                     defvert_clear(struct MDeformVert *dvert);
+int                      defvert_find_shared(const struct MDeformVert *dvert_a, const struct MDeformVert *dvert_b);
 
 float  defvert_find_weight(const struct MDeformVert *dvert, const int defgroup);
 float  defvert_array_find_weight_safe(const struct MDeformVert *dvert, const int index, const int defgroup);
diff --git a/source/blender/blenkernel/intern/deform.c b/source/blender/blenkernel/intern/deform.c
index 82938ed1d39..7c13ca388e0 100644
--- a/source/blender/blenkernel/intern/deform.c
+++ b/source/blender/blenkernel/intern/deform.c
@@ -790,3 +790,23 @@ void defvert_clear(MDeformVert *dvert)
 
 	dvert->totweight = 0;
 }
+
+/**
+ * \return The first group index shared by both deform verts
+ * or -1 if none are found.
+ */
+int defvert_find_shared(const MDeformVert *dvert_a, const MDeformVert *dvert_b)
+{
+	if (dvert_a->totweight && dvert_b->totweight) {
+		MDeformWeight *dw = dvert_a->dw;
+		unsigned int i;
+
+		for (i = dvert_a->totweight; i != 0; i--, dw++) {
+			if (dw->weight > 0.0f && defvert_find_weight(dvert_b, dw->def_nr) > 0.0f) {
+				return dw->def_nr;
+			}
+		}
+	}
+
+	return -1;
+}