refactor(mobile): Immich image provider

mobile/lib/modules/activities/widgets/activity_tile.dart

@@ -3,8 +3,8 @@ import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:immich_mobile/extensions/build_context_extensions.dart';
 import 'package:immich_mobile/extensions/datetime_extensions.dart';
 import 'package:immich_mobile/modules/activities/models/activity.model.dart';
+import 'package:immich_mobile/modules/asset_viewer/image_providers/immich_remote_image_provider.dart';
 import 'package:immich_mobile/modules/asset_viewer/providers/current_asset.provider.dart';
-import 'package:immich_mobile/shared/ui/immich_image.dart';
 import 'package:immich_mobile/shared/ui/user_circle_avatar.dart';
 
 class ActivityTile extends HookConsumerWidget {
@@ -106,7 +106,10 @@ class _ActivityAssetThumbnail extends StatelessWidget {
       decoration: BoxDecoration(
         borderRadius: const BorderRadius.all(Radius.circular(4)),
         image: DecorationImage(
-          image: ImmichImage.remoteThumbnailProviderForId(assetId),
+          image: ImmichRemoteImageProvider(
+            assetId: assetId,
+            isThumbnail: true,
+          ),
           fit: BoxFit.cover,
         ),
       ),

mobile/lib/modules/album/ui/album_thumbnail_card.dart

@@ -45,7 +45,7 @@ class AlbumThumbnailCard extends StatelessWidget {
           );
         }
 
-        buildAlbumThumbnail() => ImmichImage(
+        buildAlbumThumbnail() => ImmichImage.thumbnail(
               album.thumbnail.value,
               width: cardSize,
               height: cardSize,

mobile/lib/modules/album/ui/shared_album_thumbnail_image.dart

@@ -16,7 +16,11 @@ class SharedAlbumThumbnailImage extends HookConsumerWidget {
       },
       child: Stack(
         children: [
-          ImmichImage(asset, width: 500, height: 500),
+          ImmichImage.thumbnail(
+            asset,
+            width: 500,
+            height: 500,
+          ),
         ],
       ),
     );

mobile/lib/modules/album/views/sharing_page.dart

@@ -72,7 +72,7 @@ class SharingPage extends HookConsumerWidget {
               contentPadding: const EdgeInsets.symmetric(horizontal: 12),
               leading: ClipRRect(
                 borderRadius: const BorderRadius.all(Radius.circular(8)),
-                child: ImmichImage(
+                child: ImmichImage.thumbnail(
                   album.thumbnail.value,
                   width: 60,
                   height: 60,

mobile/lib/modules/asset_viewer/image_providers/immich_local_image_provider.dart

@@ -0,0 +1,98 @@
+import 'dart:async';
+import 'dart:io';
+import 'dart:ui' as ui;
+
+import 'package:cached_network_image/cached_network_image.dart';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/painting.dart';
+import 'package:immich_mobile/modules/settings/services/app_settings.service.dart';
+import 'package:immich_mobile/shared/models/asset.dart';
+
+/// The local image provider for an asset
+/// Only viable
+class ImmichLocalImageProvider extends ImageProvider<Asset> {
+  final Asset asset;
+
+  ImmichLocalImageProvider({
+    required this.asset,
+  }) : assert(asset.local != null, 'Only usable when asset.local is set');
+
+  /// 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);
+  }
+
+  @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);
+      },
+    );
+  }
+
+  //bool get _useOriginal => AppSettingsEnum.loadOriginal.defaultValue;
+  bool get _loadPreview => AppSettingsEnum.loadPreview.defaultValue;
+
+  // Streams in each stage of the image as we ask for it
+  Stream<ui.Codec> _codec(
+    Asset key,
+    ImageDecoderCallback decode,
+    StreamController<ImageChunkEvent> chunkEvents,
+  ) async* {
+    if (_loadPreview) {
+      // TODO: Use local preview
+    }
+    yield await _loadOriginalCodec(key, decode, chunkEvents);
+  }
+
+  /// The local codec for local images
+  Future<ui.Codec> _loadOriginalCodec(
+    Asset key,
+    ImageDecoderCallback decode,
+    StreamController<ImageChunkEvent> chunkEvents,
+  ) async {
+    final ui.ImmutableBuffer buffer;
+    if (asset.isImage) {
+      final File? file = await asset.local?.originFile;
+      if (file == null) {
+        throw StateError("Opening file for asset ${asset.fileName} failed");
+      }
+      try {
+        buffer = await ui.ImmutableBuffer.fromFilePath(file.path);
+      } catch (error) {
+        throw StateError("Loading asset ${asset.fileName} failed");
+      }
+    } else {
+      final thumbBytes = await asset.local?.thumbnailData;
+      if (thumbBytes == null) {
+        throw StateError("Loading thumb for video ${asset.fileName} failed");
+      }
+      buffer = await ui.ImmutableBuffer.fromUint8List(thumbBytes);
+    }
+    try {
+      final codec = await decode(buffer);
+      debugPrint("Decoded image ${asset.fileName}");
+      return codec;
+    } catch (error) {
+      throw StateError("Decoding asset ${asset.fileName} failed");
+    }
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (other is! ImmichLocalImageProvider) return false;
+    if (identical(this, other)) return true;
+    return asset == other.asset;
+  }
+
+  @override
+  int get hashCode => asset.hashCode;
+}

mobile/lib/modules/asset_viewer/image_providers/immich_remote_image_provider.dart

@@ -0,0 +1,145 @@
+import 'dart:async';
+import 'dart:io';
+import 'dart:ui' as ui;
+
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:openapi/api.dart' as api;
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/painting.dart';
+import 'package:immich_mobile/modules/settings/services/app_settings.service.dart';
+import 'package:immich_mobile/shared/models/asset.dart';
+import 'package:immich_mobile/shared/models/store.dart';
+import 'package:immich_mobile/utils/image_url_builder.dart';
+
+/// The remote image provider
+class ImmichRemoteImageProvider extends ImageProvider<String> {
+  /// The [Asset.remoteId] of the asset to fetch
+  final String assetId;
+
+  // If this is a thumbnail, we stop at loading the
+  // smallest version of the remote image
+  final bool isThumbnail;
+
+  /// Our HTTP client to make the request
+  final _httpClient = HttpClient()..autoUncompress = false;
+
+  ImmichRemoteImageProvider({
+    required this.assetId,
+    this.isThumbnail = false,
+  });
+
+  /// Converts an [ImageProvider]'s settings plus an [ImageConfiguration] to a key
+  /// that describes the precise image to load.
+  @override
+  Future<String> obtainKey(ImageConfiguration configuration) {
+    return SynchronousFuture('$assetId,$isThumbnail');
+  }
+
+  @override
+  ImageStreamCompleter loadImage(String key, ImageDecoderCallback decode) {
+    final id = key.split(',').first;
+    final chunkEvents = StreamController<ImageChunkEvent>();
+    return MultiImageStreamCompleter(
+      codec: _codec(id, decode, chunkEvents),
+      scale: 1.0,
+      chunkEvents: chunkEvents.stream,
+    );
+  }
+
+  /// Whether to show the original file or load a compressed version
+  bool get _useOriginal => Store.get(
+        AppSettingsEnum.loadOriginal.storeKey,
+        AppSettingsEnum.loadOriginal.defaultValue,
+      );
+
+  /// Whether to load the preview thumbnail first or not
+  bool get _loadPreview => Store.get(
+        AppSettingsEnum.loadPreview.storeKey,
+        AppSettingsEnum.loadPreview.defaultValue,
+      );
+
+  // Streams in each stage of the image as we ask for it
+  Stream<ui.Codec> _codec(
+    String key,
+    ImageDecoderCallback decode,
+    StreamController<ImageChunkEvent> chunkEvents,
+  ) async* {
+    // Load a preview to the chunk events
+    if (_loadPreview || isThumbnail) {
+      final preview = getThumbnailUrlForRemoteId(
+        assetId,
+        type: api.ThumbnailFormat.WEBP,
+      );
+
+      yield await _loadFromUri(
+        Uri.parse(preview),
+        decode,
+        chunkEvents,
+      );
+    }
+
+    // Guard thumnbail rendering
+    if (isThumbnail) {
+      await chunkEvents.close();
+      return;
+    }
+
+    // Load the higher resolution version of the image
+    final url = getThumbnailUrlForRemoteId(
+      assetId,
+      type: api.ThumbnailFormat.JPEG,
+    );
+    final codec = await _loadFromUri(Uri.parse(url), decode, chunkEvents);
+    yield codec;
+
+    // Load the final remote image
+    if (_useOriginal) {
+      // Load the original image
+      final url = getImageUrlFromId(assetId);
+      final codec = await _loadFromUri(Uri.parse(url), decode, chunkEvents);
+      yield codec;
+    }
+    await chunkEvents.close();
+  }
+
+  // Loads the codec from the URI and sends the events to the [chunkEvents] stream
+  Future<ui.Codec> _loadFromUri(
+    Uri uri,
+    ImageDecoderCallback decode,
+    StreamController<ImageChunkEvent> chunkEvents,
+  ) async {
+    final request = await _httpClient.getUrl(uri);
+    request.headers.add(
+      'x-immich-user-token',
+      Store.get(StoreKey.accessToken),
+    );
+    final response = await request.close();
+    // Chunks of the completed image can be shown
+    final data = await consolidateHttpClientResponseBytes(
+      response,
+      onBytesReceived: (cumulative, total) {
+        chunkEvents.add(
+          ImageChunkEvent(
+            cumulativeBytesLoaded: cumulative,
+            expectedTotalBytes: total,
+          ),
+        );
+      },
+    );
+
+    // Decode the response
+    final buffer = await ui.ImmutableBuffer.fromUint8List(data);
+    return decode(buffer);
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (other is! ImmichRemoteImageProvider) return false;
+    if (identical(this, other)) return true;
+    return assetId == other.assetId;
+  }
+
+  @override
+  int get hashCode => assetId.hashCode;
+}