Core Image and GPUImage filters package for Flutter

A flutter package for iOS and Android for applying filter to image and video. Support all filters from Core Image on iOS.

Installation

Add native_filters package as a dependency in your pubspec.yaml file.

iOS

No additional configuration required, the plugin work out of the box.

Android

No additional configuration required, the plugin work out of the box.

Example

import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:native_filters/native_filters.dart';
import 'package:path_provider/path_provider.dart';
import 'package:uuid/uuid.dart';

void main() => runApp(new MaterialApp(home: MyApp()));

class MyApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final _filtersFactory = const FilterFactory();
  Filter _filter;
  File _output;
  Uint8List _data;

  String get asset => 'images/test.jpg';

  @override
  void initState() {
    super.initState();
    _prepare().then((_) => setState(() {}));
  }

  Future<void> _prepare() async {
    final directory = await getTemporaryDirectory();
    final uuid = Uuid();
    final path = '${directory.path}/${uuid.v4()}.jpg';
    if (defaultTargetPlatform == TargetPlatform.iOS) {
      _filter = await _filtersFactory.create('CIPhotoEffectMono');
    }
    if (defaultTargetPlatform == TargetPlatform.android) {
      _filter = await _filtersFactory.create('GPUImageFalseColorFilter');
    }
    await _filter?.setAssetSource(asset);
    _output = File(path);
    await _filter?.export(_output);
    _data = await _filter?.binaryOutput;
  }

  @override
  void dispose() {
    _filtersFactory.dispose(_filter);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_filter?.name ?? 'Initializing...'),
      ),
      body: Center(
        child: _output == null
            ? CircularProgressIndicator()
            : Column(
                children: <Widget>[
                  Expanded(
                    child: imagePreview1,
                  ),
                  SizedBox(height: 3),
                  Expanded(
                    child: imagePreview2,
                  )
                ],
              ),
      ),
    );
  }

  Widget get imagePreview1 {
    if (_output != null) {
      return Image.file(_output);
    }
    return Text('Failed to process and save image');
  }

  Widget get imagePreview2 {
    if (_data != null) {
      return Image.memory(_data);
    }
    return Text('Failed to process image');
  }
}

Previews

Plugin data types support

The following table shows how to pass values GPUImageFilter:

GPUAttributeClass	Filterable method	Description
float	setNum
int	setNum
boolean	setBoolValue
PointF	setPointValue
float[]	setDoubleArrayValue
float[]	setColorValue	If name of function points on color value
PointF[]	setPointArrayValue

The following table shows how to pass values CIFilter:

CIAttributeClass	CIAttributeType	Filterable method	Description
NSNumber	*	setNum
NSNumber	CIAttributeTypeBoolean	setBoolValue
CIColor		setColorValue
CIVector	CIAttributeTypePosition	setPointValue
CIVector	CIAttributeTypeOffset	setPointValue
CIVector	CIAttributeTypeRectangle	setPointArrayValue
CIVector	CIAttributeTypePosition3	setDoubleArrayValue
CIVector		setDoubleArrayValue
NSValue	*	setDoubleArrayValue

Getting Started

This project is a starting point for a Flutter plug-in package, a specialized package that includes platform-specific implementation code for Android and/or iOS.

For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.