80 lines
2.5 KiB
Dart
80 lines
2.5 KiB
Dart
import 'dart:async';
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import 'dart:ui' as ui;
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import 'package:aves/services/common/services.dart';
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import 'package:aves_report/aves_report.dart';
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import 'package:equatable/equatable.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/widgets.dart';
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@immutable
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class UriImage extends ImageProvider<UriImage> with EquatableMixin {
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final String uri, mimeType;
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final int? pageId, rotationDegrees, sizeBytes;
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final bool isFlipped;
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final double scale;
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@override
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List<Object?> get props => [uri, pageId, rotationDegrees, isFlipped, scale];
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const UriImage({
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required this.uri,
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required this.mimeType,
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required this.pageId,
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required this.rotationDegrees,
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required this.isFlipped,
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this.sizeBytes,
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this.scale = 1.0,
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});
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@override
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Future<UriImage> obtainKey(ImageConfiguration configuration) {
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return SynchronousFuture<UriImage>(this);
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}
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@override
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ImageStreamCompleter loadImage(UriImage key, ImageDecoderCallback decode) {
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final chunkEvents = StreamController<ImageChunkEvent>();
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return MultiFrameImageStreamCompleter(
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codec: _loadAsync(key, decode, chunkEvents),
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scale: key.scale,
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chunkEvents: chunkEvents.stream,
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informationCollector: () sync* {
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yield ErrorDescription('uri=$uri, pageId=$pageId, mimeType=$mimeType');
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},
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);
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}
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Future<ui.Codec> _loadAsync(UriImage key, ImageDecoderCallback decode, StreamController<ImageChunkEvent> chunkEvents) async {
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assert(key == this);
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try {
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final bytes = await mediaFetchService.getImage(
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uri,
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mimeType,
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rotationDegrees: rotationDegrees,
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isFlipped: isFlipped,
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pageId: pageId,
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sizeBytes: sizeBytes,
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onBytesReceived: (cumulative, total) {
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chunkEvents.add(ImageChunkEvent(
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cumulativeBytesLoaded: cumulative,
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expectedTotalBytes: total,
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));
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},
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);
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if (bytes.isEmpty) {
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throw UnreportedStateError('$uri ($mimeType) loading failed');
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}
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final buffer = await ui.ImmutableBuffer.fromUint8List(bytes);
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return await decode(buffer);
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} catch (error) {
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// loading may fail if the provided MIME type is incorrect (e.g. the Media Store may report a JPEG as a TIFF)
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debugPrint('$runtimeType _loadAsync failed with mimeType=$mimeType, uri=$uri, error=$error');
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throw UnreportedStateError('$mimeType decoding failed (page $pageId)');
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} finally {
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unawaited(chunkEvents.close());
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}
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}
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}
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