Merge pull request #252 from elliots/feature/return-image

optionally return image with barcode

@@ -169,3 +169,41 @@ import 'package:mobile_scanner/mobile_scanner.dart';
             }));
             }));
   }
   }
 ```
 ```
+
+Example with controller and returning images
+
+```dart
+import 'package:mobile_scanner/mobile_scanner.dart';
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Mobile Scanner')),
+      body: MobileScanner(
+        controller: MobileScannerController(
+          facing: CameraFacing.front,
+          torchEnabled: true,
+          returnImage: true,
+        ),
+        onDetect: (barcode, args) {
+          if (barcode.rawValue == null) {
+            debugPrint('Failed to scan Barcode');
+          } else {
+            final String code = barcode.rawValue!;
+            debugPrint('Barcode found! $code');
+
+            debugPrint(
+                'Image returned! length: ${barcode.image!.lengthInBytes}b');
+            showDialog(
+              context: context,
+              builder: (context) => Image(image: MemoryImage(barcode.image!)),
+            );
+            Future.delayed(const Duration(seconds: 2), () {
+              Navigator.pop(context);
+            });
+          }
+        },
+      ),
+    );
+  }
+```

+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:mobile_scanner/mobile_scanner.dart';
+
+class BarcodeScannerReturningImage extends StatefulWidget {
+  const BarcodeScannerReturningImage({Key? key}) : super(key: key);
+
+  @override
+  _BarcodeScannerReturningImageState createState() =>
+      _BarcodeScannerReturningImageState();
+}
+
+class _BarcodeScannerReturningImageState
+    extends State<BarcodeScannerReturningImage>
+    with SingleTickerProviderStateMixin {
+  String? barcode;
+  Uint8List? image;
+
+  MobileScannerController controller = MobileScannerController(
+    torchEnabled: true,
+    returnImage: true,
+    // formats: [BarcodeFormat.qrCode]
+    // facing: CameraFacing.front,
+  );
+
+  bool isStarted = true;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: Colors.black,
+      body: Builder(
+        builder: (context) {
+          return Stack(
+            children: [
+              MobileScanner(
+                controller: controller,
+                fit: BoxFit.contain,
+                // allowDuplicates: true,
+                // controller: MobileScannerController(
+                //   torchEnabled: true,
+                //   facing: CameraFacing.front,
+                // ),
+                onDetect: (barcode, args) {
+                  setState(() {
+                    this.barcode = barcode.rawValue;
+                    showDialog(
+                      context: context,
+                      builder: (context) => Image(
+                        image: MemoryImage(image!),
+                        fit: BoxFit.contain,
+                      ),
+                    );
+                    image = barcode.image;
+                  });
+                },
+              ),
+              Align(
+                alignment: Alignment.bottomCenter,
+                child: Container(
+                  alignment: Alignment.bottomCenter,
+                  height: 100,
+                  color: Colors.black.withOpacity(0.4),
+                  child: Row(
+                    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+                    children: [
+                      IconButton(
+                        color: Colors.white,
+                        icon: ValueListenableBuilder(
+                          valueListenable: controller.torchState,
+                          builder: (context, state, child) {
+                            if (state == null) {
+                              return const Icon(
+                                Icons.flash_off,
+                                color: Colors.grey,
+                              );
+                            }
+                            switch (state as TorchState) {
+                              case TorchState.off:
+                                return const Icon(
+                                  Icons.flash_off,
+                                  color: Colors.grey,
+                                );
+                              case TorchState.on:
+                                return const Icon(
+                                  Icons.flash_on,
+                                  color: Colors.yellow,
+                                );
+                            }
+                          },
+                        ),
+                        iconSize: 32.0,
+                        onPressed: () => controller.toggleTorch(),
+                      ),
+                      IconButton(
+                        color: Colors.white,
+                        icon: isStarted
+                            ? const Icon(Icons.stop)
+                            : const Icon(Icons.play_arrow),
+                        iconSize: 32.0,
+                        onPressed: () => setState(() {
+                          isStarted ? controller.stop() : controller.start();
+                          isStarted = !isStarted;
+                        }),
+                      ),
+                      Center(
+                        child: SizedBox(
+                          width: MediaQuery.of(context).size.width - 200,
+                          height: 50,
+                          child: FittedBox(
+                            child: Text(
+                              barcode ?? 'Scan something!',
+                              overflow: TextOverflow.fade,
+                              style: Theme.of(context)
+                                  .textTheme
+                                  .headline4!
+                                  .copyWith(color: Colors.white),
+                            ),
+                          ),
+                        ),
+                      ),
+                      IconButton(
+                        color: Colors.white,
+                        icon: ValueListenableBuilder(
+                          valueListenable: controller.cameraFacingState,
+                          builder: (context, state, child) {
+                            if (state == null) {
+                              return const Icon(Icons.camera_front);
+                            }
+                            switch (state as CameraFacing) {
+                              case CameraFacing.front:
+                                return const Icon(Icons.camera_front);
+                              case CameraFacing.back:
+                                return const Icon(Icons.camera_rear);
+                            }
+                          },
+                        ),
+                        iconSize: 32.0,
+                        onPressed: () => controller.switchCamera(),
+                      ),
+                      SizedBox(
+                        width: 50,
+                        height: 50,
+                        child: image != null
+                            ? Image(
+                                image: MemoryImage(image!),
+                                fit: BoxFit.contain,
+                              )
+                            : Container(),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ],
+          );
+        },
+      ),
+    );
+  }
+}

 import 'package:flutter/material.dart';
 import 'package:flutter/material.dart';
 import 'package:mobile_scanner_example/barcode_scanner_controller.dart';
 import 'package:mobile_scanner_example/barcode_scanner_controller.dart';
+import 'package:mobile_scanner_example/barcode_scanner_returning_image.dart';
 import 'package:mobile_scanner_example/barcode_scanner_without_controller.dart';
 import 'package:mobile_scanner_example/barcode_scanner_without_controller.dart';
 
 
 void main() => runApp(const MaterialApp(home: MyHome()));
 void main() => runApp(const MaterialApp(home: MyHome()));
@@ -31,6 +32,17 @@ class MyHome extends StatelessWidget {
               onPressed: () {
               onPressed: () {
                 Navigator.of(context).push(
                 Navigator.of(context).push(
                   MaterialPageRoute(
                   MaterialPageRoute(
+                    builder: (context) => const BarcodeScannerReturningImage(),
+                  ),
+                );
+              },
+              child:
+                  const Text('MobileScanner with Controller (returning image)'),
+            ),
+            ElevatedButton(
+              onPressed: () {
+                Navigator.of(context).push(
+                  MaterialPageRoute(
                     builder: (context) =>
                     builder: (context) =>
                         const BarcodeScannerWithoutController(),
                         const BarcodeScannerWithoutController(),
                   ),
                   ),

@@ -22,6 +22,9 @@ public class SwiftMobileScannerPlugin: NSObject, FlutterPlugin, FlutterStreamHan
     // Image to be sent to the texture
     // Image to be sent to the texture
     var latestBuffer: CVImageBuffer!
     var latestBuffer: CVImageBuffer!
 
 
+    // Return image buffer with the Barcode event
+    var returnImage: Bool = false
+    
 //    var analyzeMode: Int = 0
 //    var analyzeMode: Int = 0
     var analyzing: Bool = false
     var analyzing: Bool = false
     var position = AVCaptureDevice.Position.back
     var position = AVCaptureDevice.Position.back
@@ -61,6 +64,7 @@ public class SwiftMobileScannerPlugin: NSObject, FlutterPlugin, FlutterStreamHan
             stop(result)
             stop(result)
         case "analyzeImage":
         case "analyzeImage":
             analyzeImage(call, result)
             analyzeImage(call, result)
+
         default:
         default:
             result(FlutterMethodNotImplemented)
             result(FlutterMethodNotImplemented)
         }
         }
@@ -86,6 +90,16 @@ public class SwiftMobileScannerPlugin: NSObject, FlutterPlugin, FlutterStreamHan
         return Unmanaged<CVPixelBuffer>.passRetained(latestBuffer)
         return Unmanaged<CVPixelBuffer>.passRetained(latestBuffer)
     }
     }
 
 
+    private func ciImageToJpeg(ciImage: CIImage) -> Data {
+
+        // let ciImage = CIImage(cvPixelBuffer: latestBuffer)
+        let context:CIContext = CIContext.init(options: nil)
+        let cgImage:CGImage = context.createCGImage(ciImage, from: ciImage.extent)!
+        let uiImage:UIImage = UIImage(cgImage: cgImage, scale: 1, orientation: UIImage.Orientation.up)
+
+        return uiImage.jpegData(compressionQuality: 0.8)!;
+    }
+
     // Gets called when a new image is added to the buffer
     // Gets called when a new image is added to the buffer
     public func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
     public func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
 
 
@@ -108,7 +122,13 @@ public class SwiftMobileScannerPlugin: NSObject, FlutterPlugin, FlutterStreamHan
             scanner.process(image) { [self] barcodes, error in
             scanner.process(image) { [self] barcodes, error in
                 if error == nil && barcodes != nil {
                 if error == nil && barcodes != nil {
                     for barcode in barcodes! {
                     for barcode in barcodes! {
-                        let event: [String: Any?] = ["name": "barcode", "data": barcode.data]
+                        
+                        var event: [String: Any?] = ["name": "barcode", "data": barcode.data]
+                        if (returnImage && latestBuffer != nil) {
+                            let image: CIImage = CIImage(cvPixelBuffer: latestBuffer)
+
+                            event["image"] = FlutterStandardTypedData(bytes: ciImageToJpeg(ciImage: image))
+                        }
                         sink?(event)
                         sink?(event)
                     }
                     }
                 }
                 }
@@ -168,6 +188,8 @@ public class SwiftMobileScannerPlugin: NSObject, FlutterPlugin, FlutterStreamHan
         
         
         let argReader = MapArgumentReader(call.arguments as? [String: Any])
         let argReader = MapArgumentReader(call.arguments as? [String: Any])
 
 
+        returnImage = argReader.bool(key: "returnImage") ?? false
+        
 //        let ratio: Int = argReader.int(key: "ratio")
 //        let ratio: Int = argReader.int(key: "ratio")
         let torch: Bool = argReader.bool(key: "torch") ?? false
         let torch: Bool = argReader.bool(key: "torch") ?? false
         let facing: Int = argReader.int(key: "facing") ?? 1
         let facing: Int = argReader.int(key: "facing") ?? 1

 import 'dart:async';
 import 'dart:async';
 import 'dart:io';
 import 'dart:io';
+import 'dart:typed_data';
 
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/foundation.dart';
@@ -44,6 +45,8 @@ class MobileScannerController {
   late final ValueNotifier<CameraFacing> cameraFacingState;
   late final ValueNotifier<CameraFacing> cameraFacingState;
   final Ratio? ratio;
   final Ratio? ratio;
   final bool? torchEnabled;
   final bool? torchEnabled;
+  // Whether to return the image buffer with the Barcode event
+  final bool returnImage;
 
 
   /// If provided, the scanner will only detect those specific formats.
   /// If provided, the scanner will only detect those specific formats.
   ///
   ///
@@ -65,6 +68,7 @@ class MobileScannerController {
     this.torchEnabled,
     this.torchEnabled,
     this.formats,
     this.formats,
     this.autoResume = true,
     this.autoResume = true,
+    this.returnImage = false,
   }) {
   }) {
     // In case a new instance is created before calling dispose()
     // In case a new instance is created before calling dispose()
     if (_controllerHashcode != null) {
     if (_controllerHashcode != null) {
@@ -89,13 +93,15 @@ class MobileScannerController {
   void handleEvent(Map event) {
   void handleEvent(Map event) {
     final name = event['name'];
     final name = event['name'];
     final data = event['data'];
     final data = event['data'];
+
     switch (name) {
     switch (name) {
       case 'torchState':
       case 'torchState':
         final state = TorchState.values[data as int? ?? 0];
         final state = TorchState.values[data as int? ?? 0];
         torchState.value = state;
         torchState.value = state;
         break;
         break;
       case 'barcode':
       case 'barcode':
-        final barcode = Barcode.fromNative(data as Map? ?? {});
+        final image = returnImage ? event['image'] as Uint8List : null;
+        final barcode = Barcode.fromNative(data as Map? ?? {}, image);
         barcodesController.add(barcode);
         barcodesController.add(barcode);
         break;
         break;
       case 'barcodeMac':
       case 'barcodeMac':
@@ -169,6 +175,7 @@ class MobileScannerController {
         arguments['formats'] = formats!.map((e) => e.rawValue).toList();
         arguments['formats'] = formats!.map((e) => e.rawValue).toList();
       }
       }
     }
     }
+    arguments['returnImage'] = returnImage;
 
 
     // Start the camera with arguments
     // Start the camera with arguments
     Map<String, dynamic>? startResult = {};
     Map<String, dynamic>? startResult = {};

@@ -12,6 +12,11 @@ class Barcode {
   /// Returns null if the corner points can not be determined.
   /// Returns null if the corner points can not be determined.
   final List<Offset>? corners;
   final List<Offset>? corners;
 
 
+  /// Returns raw bytes of the image buffer
+  ///
+  /// Returns null if the image was not returned
+  final Uint8List? image;
+
   /// Returns barcode format
   /// Returns barcode format
   final BarcodeFormat format;
   final BarcodeFormat format;
 
 
@@ -74,6 +79,7 @@ class Barcode {
 
 
   Barcode({
   Barcode({
     this.corners,
     this.corners,
+    this.image,
     this.format = BarcodeFormat.ean13,
     this.format = BarcodeFormat.ean13,
     this.rawBytes,
     this.rawBytes,
     this.type = BarcodeType.text,
     this.type = BarcodeType.text,
@@ -91,7 +97,7 @@ class Barcode {
   });
   });
 
 
   /// Create a [Barcode] from native data.
   /// Create a [Barcode] from native data.
-  Barcode.fromNative(Map data)
+  Barcode.fromNative(Map data, this.image)
       : corners = toCorners(data['corners'] as List?),
       : corners = toCorners(data['corners'] as List?),
         format = toFormat(data['format'] as int),
         format = toFormat(data['format'] as int),
         rawBytes = data['rawBytes'] as Uint8List?,
         rawBytes = data['rawBytes'] as Uint8List?,