Ecore: add EAPI to retrieve Ecore_Evas parent of a buffer.

src/lib/ecore_evas/Ecore_Evas.h

@@ -1271,6 +1271,20 @@ EAPI Ecore_Evas     *ecore_evas_buffer_allocfunc_new(int w, int h, void *(*alloc
  */
 EAPI const void     *ecore_evas_buffer_pixels_get(Ecore_Evas *ee);
 
+/**
+ * @brief Return a pointer to the Ecore_Evas parent of the given Ecore_Evas.
+ *
+ * @param ee An @c Ecore_Evas handle
+ * @return A pointer to the Ecore_Evas parent.
+ *
+ * A use case for the function is to determine if the buffer is used inside
+ * X11 or Wayland. Since the buffer engine doesn't give any indication on
+ * it, we need to retrieve information from the Ecore_Evas parents.
+ *
+ * @since 1.13
+ */
+EAPI Ecore_Evas *ecore_evas_buffer_ecore_evas_parent_get(Ecore_Evas *ee);
+
 /**
  * @brief Create a new @c Ecore_Evas canvas bound to the Evas
  * @b ews (Ecore + Evas Single Process Windowing System) engine

src/lib/ecore_evas/ecore_evas_buffer.c

@@ -741,6 +741,17 @@ ecore_evas_buffer_pixels_get(Ecore_Evas *ee)
    return bdata->pixels;
 }
 
+EAPI Ecore_Evas *
+ecore_evas_buffer_ecore_evas_parent_get(Ecore_Evas *ee)
+{
+   Ecore_Evas_Engine_Buffer_Data *bdata;
+
+   EINA_SAFETY_ON_NULL_RETURN_VAL(ee, NULL);
+
+   bdata = ee->engine.data;
+   return evas_object_data_get(bdata->image, "Ecore_Evas_Parent");
+}
+
 EAPI Evas_Object *
 ecore_evas_object_image_new(Ecore_Evas *ee_target)
 {