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crop_editor_helper.dart
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crop_editor_helper.dart
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//import 'dart:typed_data';
import 'dart:isolate';
import 'dart:ui';
// import 'package:isolate/load_balancer.dart';
// import 'package:isolate/isolate_runner.dart';
import 'package:extended_image/extended_image.dart';
import 'package:flutter/foundation.dart';
// ignore: implementation_imports
import 'package:http_client_helper/http_client_helper.dart';
import 'package:image/image.dart';
import 'package:image_editor/image_editor.dart';
// final Future<LoadBalancer> loadBalancer =
// LoadBalancer.create(1, IsolateRunner.spawn);
enum ImageType { gif, jpg }
class EditImageInfo {
EditImageInfo(
this.data,
this.imageType,
);
final Uint8List? data;
final ImageType imageType;
}
Future<EditImageInfo> cropImageDataWithDartLibrary(
{required ExtendedImageEditorState state}) async {
print('dart library start cropping');
///crop rect base on raw image
Rect cropRect = state.getCropRect()!;
print('getCropRect : $cropRect');
// in web, we can't get rawImageData due to .
// using following code to get imageCodec without download it.
// final Uri resolved = Uri.base.resolve(key.url);
// // This API only exists in the web engine implementation and is not
// // contained in the analyzer summary for Flutter.
// return ui.webOnlyInstantiateImageCodecFromUrl(
// resolved); //
final Uint8List data = kIsWeb &&
state.widget.extendedImageState.imageWidget.image
is ExtendedNetworkImageProvider
? await _loadNetwork(state.widget.extendedImageState.imageWidget.image
as ExtendedNetworkImageProvider)
///toByteData is not work on web
///https://github.com/flutter/flutter/issues/44908
// (await state.image.toByteData(format: ui.ImageByteFormat.png))
// .buffer
// .asUint8List()
: state.rawImageData;
if (data == state.rawImageData &&
state.widget.extendedImageState.imageProvider is ExtendedResizeImage) {
final ImmutableBuffer buffer =
await ImmutableBuffer.fromUint8List(state.rawImageData);
final ImageDescriptor descriptor = await ImageDescriptor.encoded(buffer);
final double widthRatio = descriptor.width / state.image!.width;
final double heightRatio = descriptor.height / state.image!.height;
cropRect = Rect.fromLTRB(
cropRect.left * widthRatio,
cropRect.top * heightRatio,
cropRect.right * widthRatio,
cropRect.bottom * heightRatio,
);
}
final EditActionDetails editAction = state.editAction!;
final DateTime time1 = DateTime.now();
//Decode source to Animation. It can holds multi frame.
Image? src;
//LoadBalancer lb;
if (kIsWeb) {
src = decodeImage(data);
} else {
src = await compute(decodeImage, data);
}
if (src != null) {
//handle every frame.
src.frames = src.frames.map((Image image) {
final DateTime time2 = DateTime.now();
//clear orientation
image = bakeOrientation(image);
if (editAction.needCrop) {
image = copyCrop(
image,
x: cropRect.left.toInt(),
y: cropRect.top.toInt(),
width: cropRect.width.toInt(),
height: cropRect.height.toInt(),
);
}
if (editAction.needFlip) {
late FlipDirection mode;
if (editAction.flipY && editAction.flipX) {
mode = FlipDirection.both;
} else if (editAction.flipY) {
mode = FlipDirection.horizontal;
} else if (editAction.flipX) {
mode = FlipDirection.vertical;
}
image = flip(image, direction: mode);
}
if (editAction.hasRotateAngle) {
image = copyRotate(image, angle: editAction.rotateAngle);
}
final DateTime time3 = DateTime.now();
print('${time3.difference(time2)} : crop/flip/rotate');
return image;
}).toList();
if (src.frames.length == 1) {}
}
/// you can encode your image
///
/// it costs much time and blocks ui.
//var fileData = encodeJpg(src);
/// it will not block ui with using isolate.
//var fileData = await compute(encodeJpg, src);
//var fileData = await isolateEncodeImage(src);
assert(src != null);
List<int>? fileData;
print('start encode');
final DateTime time4 = DateTime.now();
final bool onlyOneFrame = src!.numFrames == 1;
//If there's only one frame, encode it to jpg.
if (kIsWeb) {
fileData =
onlyOneFrame ? encodeJpg(Image.from(src.frames.first)) : encodeGif(src);
} else {
//fileData = await lb.run<List<int>, Image>(encodeJpg, src);
fileData = (onlyOneFrame
? await compute(encodeJpg, Image.from(src.frames.first))
: await compute(encodeGif, src));
}
final DateTime time5 = DateTime.now();
print('${time5.difference(time4)} : encode');
print('${time5.difference(time1)} : total time');
return EditImageInfo(
Uint8List.fromList(fileData!),
onlyOneFrame ? ImageType.jpg : ImageType.gif,
);
}
Future<EditImageInfo> cropImageDataWithNativeLibrary(
{required ExtendedImageEditorState state}) async {
print('native library start cropping');
Rect cropRect = state.getCropRect()!;
if (state.widget.extendedImageState.imageProvider is ExtendedResizeImage) {
final ImmutableBuffer buffer =
await ImmutableBuffer.fromUint8List(state.rawImageData);
final ImageDescriptor descriptor = await ImageDescriptor.encoded(buffer);
final double widthRatio = descriptor.width / state.image!.width;
final double heightRatio = descriptor.height / state.image!.height;
cropRect = Rect.fromLTRB(
cropRect.left * widthRatio,
cropRect.top * heightRatio,
cropRect.right * widthRatio,
cropRect.bottom * heightRatio,
);
}
final EditActionDetails action = state.editAction!;
final int rotateAngle = action.rotateAngle.toInt();
final bool flipHorizontal = action.flipY;
final bool flipVertical = action.flipX;
final Uint8List img = state.rawImageData;
final ImageEditorOption option = ImageEditorOption();
if (action.needCrop) {
option.addOption(ClipOption.fromRect(cropRect));
}
if (action.needFlip) {
option.addOption(
FlipOption(horizontal: flipHorizontal, vertical: flipVertical));
}
if (action.hasRotateAngle) {
option.addOption(RotateOption(rotateAngle));
}
final DateTime start = DateTime.now();
final Uint8List? result = await ImageEditor.editImage(
image: img,
imageEditorOption: option,
);
print('${DateTime.now().difference(start)} :total time');
return EditImageInfo(result, ImageType.jpg);
}
Future<dynamic> isolateDecodeImage(List<int> data) async {
final ReceivePort response = ReceivePort();
await Isolate.spawn(_isolateDecodeImage, response.sendPort);
final dynamic sendPort = await response.first;
final ReceivePort answer = ReceivePort();
// ignore: always_specify_types
sendPort.send([answer.sendPort, data]);
return answer.first;
}
Future<dynamic> isolateEncodeImage(Image src) async {
final ReceivePort response = ReceivePort();
await Isolate.spawn(_isolateEncodeImage, response.sendPort);
final dynamic sendPort = await response.first;
final ReceivePort answer = ReceivePort();
// ignore: always_specify_types
sendPort.send([answer.sendPort, src]);
return answer.first;
}
void _isolateDecodeImage(SendPort port) {
final ReceivePort rPort = ReceivePort();
port.send(rPort.sendPort);
rPort.listen((dynamic message) {
final SendPort send = message[0] as SendPort;
final List<int> data = message[1] as List<int>;
send.send(decodeImage(Uint8List.fromList(data)));
});
}
void _isolateEncodeImage(SendPort port) {
final ReceivePort rPort = ReceivePort();
port.send(rPort.sendPort);
rPort.listen((dynamic message) {
final SendPort send = message[0] as SendPort;
final Image src = message[1] as Image;
send.send(encodeJpg(src));
});
}
/// it may be failed, due to Cross-domain
Future<Uint8List> _loadNetwork(ExtendedNetworkImageProvider key) async {
try {
final Response? response = await HttpClientHelper.get(Uri.parse(key.url),
headers: key.headers,
timeLimit: key.timeLimit,
timeRetry: key.timeRetry,
retries: key.retries,
cancelToken: key.cancelToken);
return response!.bodyBytes;
} on OperationCanceledError catch (_) {
print('User cancel request ${key.url}.');
return Future<Uint8List>.error(
StateError('User cancel request ${key.url}.'));
} catch (e) {
return Future<Uint8List>.error(StateError('failed load ${key.url}. \n $e'));
}
}