DAQ: added has_sufficient_low_res_spots function but forgot to commit it - sorry!

common/src/aaredaqlib/find_xtal.py

@@ -297,3 +297,22 @@ def raster_centre_of_mass(result_array, images) -> CenterOfMassModel | None:
         logger.warning("No valid center of mass found")
         return None
 
+def has_sufficient_low_res_spots(
+        result_array: np.ndarray,
+        min_spots_low_res: float,
+    ) -> bool:
+    if result_array is None or result_array.size == 0:
+        logger.warning("Empty result_array passed to has_sufficient_low_res_spots")
+        return False
+
+    max_val = float(np.nanmax(result_array))
+    logger.info(f"Max spots_low_res in raster result_array: {max_val}")
+
+    if max_val < min_spots_low_res:
+        logger.info(
+            "Raster rejected: max spots_low_res "
+            f"{max_val} < required {min_spots_low_res}"
+        )
+        return False
+
+    return True