native_filters

Description:

native filters

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');
}
}
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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.