BMesh: add function to check if a point is inside a faces UV's

source/blender/bmesh/intern/bmesh_query_uv.c

@@ -203,3 +203,22 @@ bool BM_edge_uv_share_vert_check(BMEdge *e, BMLoop *l_a, BMLoop *l_b, const int
 
   return true;
 }
+
+/**
+ * Check if the point is inside the UV face.
+ */
+bool BM_face_uv_point_inside_test(const BMFace *f, const float co[2], const int cd_loop_uv_offset)
+{
+  float(*projverts)[2] = BLI_array_alloca(projverts, f->len);
+
+  BMLoop *l_iter;
+  int i;
+
+  BLI_assert(BM_face_is_normal_valid(f));
+
+  for (i = 0, l_iter = BM_FACE_FIRST_LOOP(f); i < f->len; i++, l_iter = l_iter->next) {
+    copy_v2_v2(projverts[i], BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_uv_offset));
+  }
+
+  return isect_point_poly_v2(co, projverts, f->len, false);
+}

source/blender/bmesh/intern/bmesh_query_uv.h

@@ -58,3 +58,8 @@ bool BM_loop_uv_share_vert_check(BMLoop *l_a,
                                  BMLoop *l_b,
                                  const int cd_loop_uv_offset) ATTR_WARN_UNUSED_RESULT
     ATTR_NONNULL();
+
+bool BM_face_uv_point_inside_test(const BMFace *f,
+                                  const float co[2],
+                                  const int cd_loop_uv_offset) ATTR_WARN_UNUSED_RESULT
+    ATTR_NONNULL();