Cleanup: add ED_uvedit_get_aspect_y utility function

This avoids having to perform the aspect division inline.

source/blender/editors/include/ED_uvedit.h

@@ -273,6 +273,13 @@ struct BMLoop **ED_uvedit_selected_verts(const struct Scene *scene,
                                          int *r_verts_len);
 
 void ED_uvedit_get_aspect(struct Object *obedit, float *r_aspx, float *r_aspy);
+
+/**
+ * Return the X / Y aspect (wider aspects are over 1, taller are below 1).
+ * Apply this aspect by multiplying with the Y axis (X aspect is always 1 & unchanged).
+ */
+float ED_uvedit_get_aspect_y(struct Object *obedit);
+
 void ED_uvedit_get_aspect_from_material(Object *ob,
                                         const int material_index,
                                         float *r_aspx,

source/blender/editors/uvedit/uvedit_islands.cc

@@ -675,14 +675,7 @@ void ED_uvedit_pack_islands_multi(const Scene *scene,
       continue;
     }
 
-    float aspect_y = 1.0f;
-    if (params->correct_aspect) {
-      float aspx, aspy;
-      ED_uvedit_get_aspect(obedit, &aspx, &aspy);
-      if (aspx != aspy) {
-        aspect_y = aspx / aspy;
-      }
-    }
+    const float aspect_y = params->correct_aspect ? ED_uvedit_get_aspect_y(obedit) : 1.0f;
 
     bool only_selected_faces = params->only_selected_faces;
     bool only_selected_uvs = params->only_selected_uvs;

source/blender/editors/uvedit/uvedit_path.c

@@ -653,13 +653,7 @@ static int uv_shortest_path_pick_invoke(bContext *C, wmOperator *op, const wmEve
 
     if (ele_src && ele_dst) {
       /* Always use the active object, not `obedit` as the active defines the UV display. */
-      float aspect_y;
-      {
-        float aspx, aspy;
-        ED_uvedit_get_aspect(CTX_data_edit_object(C), &aspx, &aspy);
-        aspect_y = aspx / aspy;
-      }
-
+      const float aspect_y = ED_uvedit_get_aspect_y(CTX_data_edit_object(C));
       uv_shortest_path_pick_ex(
           scene, depsgraph, obedit, &op_params, ele_src, ele_dst, aspect_y, offsets);
 
@@ -744,12 +738,7 @@ static int uv_shortest_path_pick_exec(bContext *C, wmOperator *op)
   }
 
   /* Always use the active object, not `obedit` as the active defines the UV display. */
-  float aspect_y;
-  {
-    float aspx, aspy;
-    ED_uvedit_get_aspect(CTX_data_edit_object(C), &aspx, &aspy);
-    aspect_y = aspx / aspy;
-  }
+  const float aspect_y = ED_uvedit_get_aspect_y(CTX_data_edit_object(C));
 
   struct PathSelectParams op_params;
   path_select_params_from_op(op, &op_params);
@@ -803,13 +792,7 @@ static int uv_shortest_path_select_exec(bContext *C, wmOperator *op)
   const char uv_selectmode = ED_uvedit_select_mode_get(scene);
   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;
-  }
+  const float aspect_y = ED_uvedit_get_aspect_y(CTX_data_edit_object(C));
 
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;

source/blender/editors/uvedit/uvedit_smart_stitch.c

@@ -130,6 +130,7 @@ typedef struct UvEdge {
 
 /* stitch state object */
 typedef struct StitchState {
+  /** The `aspect[0] / aspect[1]`. */
   float aspect;
   /* object for editmesh */
   Object *obedit;
@@ -1827,7 +1828,6 @@ static StitchState *stitch_init(bContext *C,
   StitchState *state;
   Scene *scene = CTX_data_scene(C);
   ToolSettings *ts = scene->toolsettings;
-  float aspx, aspy;
 
   BMEditMesh *em = BKE_editmesh_from_object(obedit);
   const BMUVOffsets offsets = BM_uv_map_get_offsets(em->bm);
@@ -1850,8 +1850,7 @@ static StitchState *stitch_init(bContext *C,
     return NULL;
   }
 
-  ED_uvedit_get_aspect(obedit, &aspx, &aspy);
-  state->aspect = aspx / aspy;
+  state->aspect = ED_uvedit_get_aspect_y(obedit);
 
   int unique_uvs = state->element_map->total_unique_uvs;
   state->total_separate_uvs = unique_uvs;

source/blender/editors/uvedit/uvedit_unwrap_ops.c

@@ -281,6 +281,13 @@ void ED_uvedit_get_aspect(Object *ob, float *r_aspx, float *r_aspy)
   ED_uvedit_get_aspect_from_material(ob, efa->mat_nr, r_aspx, r_aspy);
 }
 
+float ED_uvedit_get_aspect_y(Object *ob)
+{
+  float aspect[2];
+  ED_uvedit_get_aspect(ob, &aspect[0], &aspect[1]);
+  return aspect[0] / aspect[1];
+}
+
 static bool uvedit_is_face_affected(const Scene *scene,
                                     BMFace *efa,
                                     const UnwrapOptions *options,
@@ -1548,9 +1555,7 @@ static void shrink_loop_uv_by_aspect_ratio(BMFace *efa,
 static void correct_uv_aspect(Object *ob, BMEditMesh *em)
 {
   const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_PROP_FLOAT2);
-  float aspx, aspy;
-  ED_uvedit_get_aspect(ob, &aspx, &aspy);
-  const float aspect_y = aspx / aspy;
+  const float aspect_y = ED_uvedit_get_aspect_y(ob);
   if (aspect_y == 1.0f) {
     /* Scaling by 1.0 has no effect. */
     return;