aves/lib/image_providers/thumbnail_provider.dart
2022-07-18 18:15:48 +02:00

95 lines
3.3 KiB
Dart

import 'dart:ui' as ui;
import 'package:aves/services/common/services.dart';
import 'package:equatable/equatable.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
class ThumbnailProvider extends ImageProvider<ThumbnailProviderKey> {
final ThumbnailProviderKey key;
ThumbnailProvider(this.key);
@override
Future<ThumbnailProviderKey> obtainKey(ImageConfiguration configuration) {
// configuration can be empty (e.g. when obtaining key for eviction)
// so we do not compute the target width/height here
// and pass it to the key, to use it later for image loading
return SynchronousFuture<ThumbnailProviderKey>(key);
}
@override
ImageStreamCompleter loadBuffer(ThumbnailProviderKey key, DecoderBufferCallback decode) {
return MultiFrameImageStreamCompleter(
codec: _loadAsync(key, decode),
scale: 1.0,
debugLabel: kReleaseMode ? null : [key.uri, key.extent].join('-'),
informationCollector: () sync* {
yield ErrorDescription('uri=${key.uri}, pageId=${key.pageId}, mimeType=${key.mimeType}, extent=${key.extent}');
},
);
}
Future<ui.Codec> _loadAsync(ThumbnailProviderKey key, DecoderBufferCallback decode) async {
final uri = key.uri;
final mimeType = key.mimeType;
final pageId = key.pageId;
try {
final bytes = await mediaFetchService.getThumbnail(
uri: uri,
mimeType: mimeType,
pageId: pageId,
rotationDegrees: key.rotationDegrees,
isFlipped: key.isFlipped,
dateModifiedSecs: key.dateModifiedSecs,
extent: key.extent,
taskKey: key,
);
if (bytes.isEmpty) {
throw StateError('$uri ($mimeType) loading failed');
}
final buffer = await ui.ImmutableBuffer.fromUint8List(bytes);
return await decode(buffer);
} catch (error) {
// loading may fail if the provided MIME type is incorrect (e.g. the Media Store may report a JPEG as a TIFF)
debugPrint('$runtimeType _loadAsync failed with mimeType=$mimeType, uri=$uri, error=$error');
throw StateError('$mimeType decoding failed (page $pageId)');
}
}
@override
void resolveStreamForKey(ImageConfiguration configuration, ImageStream stream, ThumbnailProviderKey key, ImageErrorListener handleError) {
mediaFetchService.resumeLoading(key);
super.resolveStreamForKey(configuration, stream, key, handleError);
}
void pause() => mediaFetchService.cancelThumbnail(key);
}
@immutable
class ThumbnailProviderKey extends Equatable {
// do not store the entry as it is, because the key should be constant
// but the entry attributes may change over time
final String uri, mimeType;
final int? pageId;
final int rotationDegrees;
final bool isFlipped;
final int dateModifiedSecs;
final double extent;
@override
List<Object?> get props => [uri, pageId, dateModifiedSecs, extent];
const ThumbnailProviderKey({
required this.uri,
required this.mimeType,
required this.pageId,
required this.rotationDegrees,
required this.isFlipped,
required this.dateModifiedSecs,
this.extent = 0,
});
@override
String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, pageId=$pageId, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, dateModifiedSecs=$dateModifiedSecs, extent=$extent}';
}