74 lines
2.0 KiB
Dart
74 lines
2.0 KiB
Dart
/*
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* Copyright (c) 2024-2025 Fabian Freund.
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*
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* This file is part of WebLibre
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* (see https://weblibre.eu).
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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import 'dart:typed_data';
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import 'dart:ui';
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import 'package:fast_equatable/hash.dart';
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import 'package:weblibre/core/logger.dart';
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import 'package:weblibre/domain/entities/equatable_image.dart';
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import 'package:weblibre/utils/lru_cache.dart';
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final _cache = LRUCache<int, EquatableImage>(
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100,
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onEvict: (image) => image.dispose(),
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);
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/// Clears the global image cache, disposing all cached images.
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void clearImageCache() {
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_cache.clear();
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}
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Future<EquatableImage?> tryDecodeImage(
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Uint8List bytes, {
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int? targetWidth,
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int? targetHeight,
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bool allowUpscaling = true,
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}) async {
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final digest = secureHash(bytes);
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final cached = _cache.get(digest);
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if (cached?.value != null) {
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return cached;
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} else if (cached != null) {
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_cache.remove(digest);
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}
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try {
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final codec = await instantiateImageCodec(
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bytes,
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targetWidth: targetWidth,
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targetHeight: targetHeight,
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allowUpscaling: allowUpscaling,
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);
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final frameInfo = await codec.getNextFrame();
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final image = EquatableImage(frameInfo.image, hash: digest);
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if (image.value != null && image.value!.width > 0) {
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_cache.set(digest, image);
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return image;
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}
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} catch (e, s) {
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logger.w('Failed to decode image', error: e, stackTrace: s);
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}
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return null;
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}
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