blurhash_ffi

A Blurhash compact Image placeholder encoder and decoder FFI implementation for Flutter in Rust via experemental feature Native Assets.

Matches the official Blurhash implementation in performance and quality.

Supports

Platform	Status	Description
Android	✅	-
iOS	✅	-
macOS	✅	-
Linux	⚠️	Not tested
Windows	✅	-
Web	❌	Rust can compiled to WebAssembly, but no supported yet. This library compiled on standalone wasm module (not in Empscripten, AssemblyScript) that Dart can't be use non-JS enviroments. Also, Dart should use FFI bindings for call wasm module. Stopped issues: comment

Installation

Add dependency to your pubspec.yaml file following the command below:

For dart projects:

dart pub add dart_blurhash_ffi

For flutter projects:

dart pub add flutter_blurhash_ffi

Usage

To use this plugin, add blurhash_ffi as a dependency in your pubspec.yaml file

Flutter usage

import 'package:flutter_blurhash_ffi/flutter_blurhash_ffi.dart';

/// Encoding and Decoding all in One Step
///
/// `ImageProvider` in    -> Send your Image to be encoded.
/// `ImageProvider` out   -> Get your blurry image version.
class BlurhashMyImage extends StatelessWidget {
  final String imageUrl;
  const BlurhashMyImage({required this.imageUrl, super.key});

  @override
  Widget build(BuildContext context) {
    return Image(
      image: BlurhashFfiImage.fromImageProvider(
        NetworkImage(imageUrl),  // you can use any image provider of your choice.
        decodingHeight: 1920,
        decodingWidth: 1080,
      ),
      alignment: Alignment.center,
      fit: BoxFit.cover
    );
  }
}


class BlurhashMyImage2 extends StatelessWidget {
  final String blurhash;
  const BlurhashMyImage2({required this.blurhash, super.key});

  @override
  Widget build(BuildContext context) {
    return Image(
      image: BlurhashFfiImage(blurhash),
      width: 200,
      height: 200,
      alignment: Alignment.center,
      fit: BoxFit.cover
    );
  }
}

Warning

Not recommend use it (without blurhash string param), because in this case, encoding and decoding will be performed. This effect can be obtained almost through ImageFiltered.

Encoding

Encoding now uses sync interface (without Future).

import 'package:dart_blurhash_ffi/dart_blurhash_ffi.dart';

final Uint8List blurhashImageBytes = File('assets/image.webp').readAsBytesSync();

/// Signature
/// static String encode(
///   Uint8List data, {
///   int componentX = 4,
///   int componentY = 3,
/// })
/// may throw `BlurhashFFIException` if encoding fails.
final String blurHash = BlurhashFFI.encode(blurhashImageBytes);

// Or via codec

final String blurHashSame = BlurhashFfiCodec().encoder.convert(blurhashImageBytes);

Decoding

Decoding now uses sync interface (without Future).

import 'package:dart_blurhash_ffi/dart_blurhash_ffi.dart';

final String blurhash = 'LGFO~6Yk^6#M@-5c,1Ex@@or[j6o';

/// Signature
///
/// static Uint8List decode(
///   String blurhash, {
///   int width = 32,
///   int height = 32,
///   int punch = 1,
/// })
/// may throw `BlurhashFFIException` if decoding fails.
final decoded = BlurhashFFI.decode(blurhash);

// or via codec

final String decodedSame = BlurhashFfiCodec().decoder.convert(blurhash);

Check the example for more details

contributions in the form of PR's and Issues are a welcome