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Refactor to use ImmichThumbnail and local thumbnail image provider
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86 changes: 86 additions & 0 deletions
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mobile/lib/modules/asset_viewer/image_providers/immich_local_thumbnail_provider.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| import 'dart:async'; | ||
| import 'dart:ui' as ui; | ||
|
|
||
| import 'package:cached_network_image/cached_network_image.dart'; | ||
|
|
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| import 'package:flutter/foundation.dart'; | ||
| import 'package:flutter/painting.dart'; | ||
| import 'package:immich_mobile/shared/models/asset.dart'; | ||
| import 'package:photo_manager/photo_manager.dart'; | ||
|
|
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| /// The local image provider for an asset | ||
| /// Only viable | ||
| class ImmichLocalThumbnailProvider extends ImageProvider<Asset> { | ||
| final Asset asset; | ||
| final int height; | ||
| final int width; | ||
|
|
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| ImmichLocalThumbnailProvider({ | ||
| required this.asset, | ||
| this.height = 256, | ||
| this.width = 256, | ||
| }) : assert(asset.local != null, 'Only usable when asset.local is set'); | ||
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| /// Converts an [ImageProvider]'s settings plus an [ImageConfiguration] to a key | ||
| /// that describes the precise image to load. | ||
| @override | ||
| Future<Asset> obtainKey(ImageConfiguration configuration) { | ||
| return SynchronousFuture(asset); | ||
| } | ||
|
|
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| @override | ||
| ImageStreamCompleter loadImage(Asset key, ImageDecoderCallback decode) { | ||
| final chunkEvents = StreamController<ImageChunkEvent>(); | ||
| return MultiImageStreamCompleter( | ||
| codec: _codec(key, decode, chunkEvents), | ||
| scale: 1.0, | ||
| chunkEvents: chunkEvents.stream, | ||
| informationCollector: () sync* { | ||
| yield ErrorDescription(asset.fileName); | ||
| }, | ||
| ); | ||
| } | ||
|
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| // Streams in each stage of the image as we ask for it | ||
| Stream<ui.Codec> _codec( | ||
| Asset key, | ||
| ImageDecoderCallback decode, | ||
| StreamController<ImageChunkEvent> chunkEvents, | ||
| ) async* { | ||
| // Load a small thumbnail | ||
| final thumbBytes = await asset.local?.thumbnailDataWithSize( | ||
| const ThumbnailSize.square(32), | ||
| quality: 75, | ||
| ); | ||
| if (thumbBytes != null) { | ||
| final buffer = await ui.ImmutableBuffer.fromUint8List(thumbBytes); | ||
| final codec = await decode(buffer); | ||
| yield codec; | ||
| } else { | ||
| debugPrint("Loading thumb for ${asset.fileName} failed"); | ||
| } | ||
|
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| final normalThumbBytes = await asset.local | ||
| ?.thumbnailDataWithSize(ThumbnailSize(width, height)); | ||
| if (normalThumbBytes == null) { | ||
| throw StateError( | ||
| "Loading thumb for local photo ${asset.fileName} failed", | ||
| ); | ||
| } | ||
| final buffer = await ui.ImmutableBuffer.fromUint8List(normalThumbBytes); | ||
| final codec = await decode(buffer); | ||
| yield codec; | ||
|
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| chunkEvents.close(); | ||
| } | ||
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| @override | ||
| bool operator ==(Object other) { | ||
| if (other is! ImmichLocalThumbnailProvider) return false; | ||
| if (identical(this, other)) return true; | ||
| return asset == other.asset; | ||
| } | ||
|
|
||
| @override | ||
| int get hashCode => asset.hashCode; | ||
| } |
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