UV: add path select operator that uses the selection

Instead of using the mouse cursor position,
this selects between existing selected elements.

Access this since picking a selection path doesn't
work from the menu.

1 files changed, 92 insertions, 0 deletions

diff --git a/source/blender/editors/uvedit/uvedit_path.c b/source/blender/editors/uvedit/uvedit_path.c
index 4f0c472158a..e9615b62523 100644
--- a/source/blender/editors/uvedit/uvedit_path.c
+++ b/source/blender/editors/uvedit/uvedit_path.c
@@ -677,3 +677,95 @@ void UV_OT_shortest_path_pick(wmOperatorType *ot)
 }
 
 /** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Select Path Between Existing Selection
+ * \{ */
+
+static int uv_shortest_path_select_exec(bContext *C, wmOperator *op)
+{
+  Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+  Scene *scene = CTX_data_scene(C);
+  const ToolSettings *ts = scene->toolsettings;
+  bool found_valid_elements = false;
+
+  float aspect_y;
+  {
+    Object *obedit = CTX_data_edit_object(C);
+    float aspx, aspy;
+    ED_uvedit_get_aspect(obedit, &aspx, &aspy);
+    aspect_y = aspx / aspy;
+  }
+
+  ViewLayer *view_layer = CTX_data_view_layer(C);
+  uint objects_len = 0;
+  Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
+      view_layer, CTX_wm_view3d(C), &objects_len);
+  for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+    Object *obedit = objects[ob_index];
+    BMEditMesh *em = BKE_editmesh_from_object(obedit);
+    BMesh *bm = em->bm;
+    const int cd_loop_uv_offset = CustomData_get_offset(&bm->ldata, CD_MLOOPUV);
+    BMElem *ele_src = NULL, *ele_dst = NULL;
+
+    /* Find 2x elements. */
+    {
+      BMElem **ele_array = NULL;
+      int ele_array_len = 0;
+      if (ts->uv_selectmode & UV_SELECT_FACE) {
+        ele_array = (BMElem **)ED_uvedit_selected_faces(scene, bm, 3, &ele_array_len);
+      }
+      else if (ts->uv_selectmode & UV_SELECT_EDGE) {
+        ele_array = (BMElem **)ED_uvedit_selected_edges(scene, bm, 3, &ele_array_len);
+      }
+      else {
+        ele_array = (BMElem **)ED_uvedit_selected_verts(scene, bm, 3, &ele_array_len);
+      }
+
+      if (ele_array_len == 2) {
+        ele_src = ele_array[0];
+        ele_dst = ele_array[1];
+      }
+      MEM_freeN(ele_array);
+    }
+
+    if (ele_src && ele_dst) {
+      struct PathSelectParams op_params;
+      path_select_params_from_op(op, &op_params);
+
+      uv_shortest_path_pick_ex(
+          scene, depsgraph, obedit, &op_params, ele_src, ele_dst, aspect_y, cd_loop_uv_offset);
+
+      found_valid_elements = true;
+    }
+  }
+  MEM_freeN(objects);
+
+  if (!found_valid_elements) {
+    BKE_report(
+        op->reports, RPT_WARNING, "Path selection requires two matching elements to be selected");
+    return OPERATOR_CANCELLED;
+  }
+
+  return OPERATOR_FINISHED;
+}
+
+void UV_OT_shortest_path_select(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Select Shortest Path";
+  ot->idname = "UV_OT_shortest_path_select";
+  ot->description = "Selected shortest path between two vertices/edges/faces";
+
+  /* api callbacks */
+  ot->exec = uv_shortest_path_select_exec;
+  ot->poll = ED_operator_editmesh;
+
+  /* flags */
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+  /* properties */
+  path_select_properties(ot);
+}
+
+/** \} */