79 lines
2.6 KiB
Dart
79 lines
2.6 KiB
Dart
import 'dart:math';
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import 'package:aves/image_providers/region_provider.dart';
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import 'package:aves/image_providers/thumbnail_provider.dart';
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import 'package:aves/image_providers/uri_image_provider.dart';
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import 'package:aves/model/entry/cache.dart';
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import 'package:aves/model/entry/entry.dart';
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import 'package:aves/utils/math_utils.dart';
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import 'package:collection/collection.dart';
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import 'package:flutter/painting.dart';
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extension ExtraAvesEntryImages on AvesEntry {
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bool isThumbnailReady({double extent = 0}) => _isReady(_getThumbnailProviderKey(extent));
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ThumbnailProvider getThumbnail({double extent = 0}) {
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return ThumbnailProvider(_getThumbnailProviderKey(extent));
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}
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ThumbnailProviderKey _getThumbnailProviderKey(double extent) {
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EntryCache.markThumbnailExtent(extent);
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return ThumbnailProviderKey(
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uri: uri,
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mimeType: mimeType,
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pageId: pageId,
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rotationDegrees: rotationDegrees,
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isFlipped: isFlipped,
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dateModifiedSecs: dateModifiedSecs ?? -1,
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extent: extent,
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);
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}
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RegionProvider getRegion({int sampleSize = 1, double scale = 1, required Rectangle<num> region}) {
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return RegionProvider(RegionProviderKey(
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uri: uri,
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mimeType: mimeType,
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pageId: pageId,
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sizeBytes: sizeBytes,
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rotationDegrees: rotationDegrees,
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isFlipped: isFlipped,
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sampleSize: sampleSize,
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region: Rectangle(
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(region.left * scale).round(),
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(region.top * scale).round(),
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(region.width * scale).round(),
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(region.height * scale).round(),
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),
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imageSize: Size((width * scale).toDouble(), (height * scale).toDouble()),
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));
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}
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UriImage get uriImage => UriImage(
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uri: uri,
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mimeType: mimeType,
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pageId: pageId,
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rotationDegrees: rotationDegrees,
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isFlipped: isFlipped,
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sizeBytes: sizeBytes,
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);
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bool _isReady(Object providerKey) => imageCache.statusForKey(providerKey).keepAlive;
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List<ThumbnailProvider> get cachedThumbnails => EntryCache.thumbnailRequestExtents.map(_getThumbnailProviderKey).where(_isReady).map(ThumbnailProvider.new).toList();
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ThumbnailProvider get bestCachedThumbnail {
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final sizedThumbnailKey = EntryCache.thumbnailRequestExtents.map(_getThumbnailProviderKey).firstWhereOrNull(_isReady);
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return sizedThumbnailKey != null ? ThumbnailProvider(sizedThumbnailKey) : getThumbnail();
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}
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// magic number used to derive sample size from scale
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static const scaleFactor = 2.0;
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static int sampleSizeForScale(double scale) {
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var sample = 0;
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if (0 < scale && scale < 1) {
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sample = highestPowerOf2((1 / scale) / scaleFactor);
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}
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return max<int>(1, sample);
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}
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}
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