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Description:

blurhash dart

BlurHash Dart #
A pure dart implementation of BlurHash. Supports both encoding and decoding. Runs on
every supported Dart platform. See the BlurHash website or GitHub
repository for more information.
The encoder of this dart implementation produces slightly different hashes than the
TypeScript implementation but matches the official C and Python implementation. In
practice this should not be relevant.
Basic usage #
Decoding a BlurHash #
import 'package:blurhash_dart/blurhash_dart.dart';
import 'package:image/image.dart' as img;

const hash = 'LEHV6nWB2yk8pyo0adR*.7kCMdnj';
BlurHash blurHash = BlurHash.decode(hash);
img.Image image = blurHash.toImage(35, 20);

// Display image...
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Note: Usage with Flutter
Flutter does not expect raw bytes for its Image.memory widget, but fully encoded
images with their corresponding headers (e.g. bitmap, jpg, png). The easiest way to
accomplish this, is to use, for example, encodeJpg from package:image:
Widget build(BuildContext context) {
final image = BlurHash.decode('LEHV6nWB2yk8pyo0adR*.7kCMdnj').toImage(35, 20);
return Image.memory(Uint8List.fromList(encodeJpg(image)));
}
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It is recommended to cache the resulting image in a stateful widget, such that it
does not need to be recomputed on every build call.
Encoding an Image #
import 'dart:io';

import 'package:blurhash_dart/blurhash_dart.dart';
import 'package:image/image.dart' as img;

final data = File('path/to/image.png').readAsBytesSync();
final image = img.decodeImage(data.toList());
final blurHash = BlurHash.encode(image!, numCompX: 4, numCompY: 3);

print(blurHash.hash);
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Extension Methods #
Additional extension methods to compute, for example color averages, are available
when importing package:blurhash_dart/blurhash_extensions.dart. See example for
basic usage.