prepare for multiple apps

2026-04-06 12:23:11 +02:00
parent bd1600e8dc
commit 5afc323f04
904 changed files with 29 additions and 29 deletions
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2024-2026 Fabian Freund.
+ *
+ * This file is part of WebLibre
+ * (see https://weblibre.eu).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+import 'dart:typed_data';
+import 'dart:ui';
+
+import 'package:fast_equatable/hash.dart';
+import 'package:weblibre/core/logger.dart';
+import 'package:weblibre/domain/entities/equatable_image.dart';
+import 'package:weblibre/utils/lru_cache.dart';
+
+final _cache = LRUCache<int, EquatableImage>(100);
+
+/// Clears the global image decode cache.
+void clearImageCache() {
+  _cache.clear();
+}
+
+Future<EquatableImage?> tryDecodeImage(
+  Uint8List bytes, {
+  int? targetWidth,
+  int? targetHeight,
+  bool allowUpscaling = true,
+}) async {
+  final digest = secureHash(bytes);
+
+  final cached = _cache.get(digest);
+  if (cached?.value != null) {
+    return cached;
+  } else if (cached != null) {
+    _cache.remove(digest);
+  }
+
+  try {
+    final codec = await instantiateImageCodec(
+      bytes,
+      targetWidth: targetWidth,
+      targetHeight: targetHeight,
+      allowUpscaling: allowUpscaling,
+    );
+
+    final frameInfo = await codec.getNextFrame();
+    final image = EquatableImage(frameInfo.image, hash: digest);
+
+    if (image.value != null && image.value!.width > 0) {
+      _cache.set(digest, image);
+      return image;
+    }
+  } catch (e, s) {
+    logger.w('Failed to decode image', error: e, stackTrace: s);
+  }
+
+  return null;
+}