From 644a2c1e3ad5c3a68e5efd612e730d55f1c58a8c Mon Sep 17 00:00:00 2001
From: otsmr <git@tsmr.eu>
Date: Mon, 20 Jul 2026 13:24:46 +0200
Subject: [PATCH] fix performance issue

---
 .../services/memories/memories.service.dart   | 23 +++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/lib/src/services/memories/memories.service.dart b/lib/src/services/memories/memories.service.dart
index 868ebcde..035d49e8 100644
--- a/lib/src/services/memories/memories.service.dart
+++ b/lib/src/services/memories/memories.service.dart
@@ -4,6 +4,7 @@ import 'dart:collection';
 import 'package:blurhash_dart/blurhash_dart.dart' as bh;
 import 'package:clock/clock.dart';
 import 'package:drift/drift.dart' show Value;
+import 'package:flutter/foundation.dart';
 import 'package:image/image.dart' as img;
 import 'package:intl/intl.dart';
 import 'package:twonly/locator.dart';
@@ -259,7 +260,12 @@ class MemoriesService {
       // Phase 2: Background — hash, crop analysis, size calculation.
       // Each DB write here fires the stream subscription above, keeping
       // the gallery state fresh without a separate notification step.
-      await _backgroundProcessPendingFiles(pendingFiles);
+      _dbSubscription?.pause();
+      try {
+        await _backgroundProcessPendingFiles(pendingFiles);
+      } finally {
+        _dbSubscription?.resume();
+      }
     } catch (e) {
       Log.error('Error in background migration queue: $e');
     }
@@ -291,9 +297,8 @@ class MemoriesService {
                 : mediaService.originalPath;
             if (imageFile.existsSync()) {
               final bytes = await imageFile.readAsBytes();
-              final image = img.decodeImage(bytes);
-              if (image != null) {
-                final blurhash = bh.BlurHash.encode(image).hash;
+              final blurhash = await compute(_calculateBlurhash, bytes);
+              if (blurhash != null) {
                 await twonlyDB.mediaFilesDao.updateMedia(
                   mediaFile.mediaId,
                   MediaFilesCompanion(blurhash: Value(blurhash)),
@@ -384,3 +389,13 @@ class MemoriesService {
     _stateController.close();
   }
 }
+
+String? _calculateBlurhash(Uint8List bytes) {
+  try {
+    final image = img.decodeImage(bytes);
+    if (image != null) {
+      return bh.BlurHash.encode(image).hash;
+    }
+  } catch (_) {}
+  return null;
+}