added bscan reprocessing

python_app/gui/app_window.py

@@ -287,6 +287,17 @@ class AppWindow(
         self._bscan_depth_axis_by_combo = {}
         self._bscan_history_floor_collection_id = 0
         self._bscan_render_signature = None
+        # Writer into the processor's input ring, used to re-feed retained sweeps so the
+        # whole visible B-scan is recomputed. Opened lazily, only while acquisition is
+        # stopped (see AppWindowBscanReplayMixin).
+        self._replay_ring_writer = None
+        self._bscan_replay_active = False
+        # Results from the last completed replay. While non-empty they, not
+        # `_result_history`, are what the B-scan renders (see AppWindowBscanReplayMixin).
+        self._bscan_replay_results = []
+        self._bscan_reprocess_timer = QTimer(self)
+        self._bscan_reprocess_timer.setSingleShot(True)
+        self._bscan_reprocess_timer.timeout.connect(self._reprocess_history_through_processor)
         self._gpr_lookup_table = None
         self._gpr_image_item = None
         self._gpr_tx_item = None
@@ -745,6 +756,10 @@ class AppWindow(
             # 0) Stop the GPIO button watcher so a late press cannot start work.
             self._stop_control_button_watcher()
             self._resume_pipeline_after_capture = False
+            # 0) Drop the B-scan replay writer so a pending debounce cannot push into a
+            # ring we are about to tear down.
+            self._bscan_reprocess_timer.stop()
+            self._close_replay_ring_writer()
             # 1) Abort active capture first (releases exclusive hardware resources).
             self._abort_capture_sequence(resume_pipeline=False)
             # 2) Stop all managed processes/readers.