/
image_editor_page.dart
137 lines (118 loc) · 3.33 KB
/
image_editor_page.dart
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import 'dart:io';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:image/image.dart' as img;
import 'package:path_provider/path_provider.dart';
import 'package:screenshot/screenshot.dart';
class ImageEditorPage extends StatefulWidget {
final String imagePath;
const ImageEditorPage({
Key? key,
required this.imagePath,
}) : super(key: key);
@override
ImageEditorPageState createState() => ImageEditorPageState();
}
class ImageEditorPageState extends State<ImageEditorPage> {
double _sliderBrightnessValue = 0;
final ScreenshotController _screenshotController = ScreenshotController();
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.black,
appBar: AppBar(),
body: Stack(
children: <Widget>[
Screenshot(
controller: _screenshotController,
child: ColorFiltered(
colorFilter: ColorFilter.matrix(
ColorFilterGenerator.brightnessAdjustMatrix(
value: _sliderBrightnessValue),
),
child: Image.file(
File(widget.imagePath),
fit: BoxFit.cover,
),
),
),
_tools(),
],
),
);
}
Widget _tools() => Row(
children: [
Expanded(
child: Slider(
value: _sliderBrightnessValue,
min: -0.5,
max: 2,
onChanged: (double value) {
setState(() {
_sliderBrightnessValue = value;
});
},
),
),
TextButton(onPressed: _applyBrightness, child: Text("Apply")),
],
);
Future<void> _applyBrightness() async {
img.Image? image =
img.decodeImage(File(widget.imagePath).readAsBytesSync());
if (image == null) return;
double brightness = _convert();
img.adjustColor(image, brightness: brightness);
print("brightness: $brightness // $_sliderBrightnessValue");
final dir = await getTemporaryDirectory();
final file = File(
'${dir.path}/image_edited_${DateTime.now().toIso8601String()}.jpg');
File(file.path).writeAsBytesSync(img.encodeJpg(image));
final file2 = File(
'${dir.path}/image_edited_${DateTime.now().toIso8601String()}.jpg');
var bytes = await _takeScreenshot();
file2.writeAsBytesSync(bytes!);
Map<String, dynamic> data = {
"image": file,
"image2": file2,
};
if (mounted) Navigator.of(context).pop(data);
}
Future<Uint8List?> _takeScreenshot() async {
var bytes = await _screenshotController.capture();
return bytes;
}
double _convert() {
return _sliderBrightnessValue * 2;
}
}
class ColorFilterGenerator {
static List<double> brightnessAdjustMatrix({required double value}) {
value = (value <= 0) ? value * 255 : value * 100;
return (value == 0)
? [1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0]
: [
1,
0,
0,
0,
value,
0,
1,
0,
0,
value,
0,
0,
1,
0,
value,
0,
0,
0,
1,
0
];
}
}