fixed inverted issues

README.md

@@ -118,8 +118,8 @@ Widget build(BuildContext context) {
 final result = zx.encodeBarcode(
     'Text to encode',
     format: Format.QRCode,
-    width: 300,
-    height: 300,
+    width: 120,
+    height: 120,
     margin: 10,
     eccLevel: 0,
 );

example/lib/main.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_zxing/flutter_zxing.dart';
+import 'package:image_picker/image_picker.dart';
 
 void main() {
   zx.setLogEnabled(kDebugMode);
@@ -34,6 +35,12 @@ class DemoPage extends StatefulWidget {
 class _DemoPageState extends State<DemoPage> {
   Uint8List? createdCodeBytes;
 
+  Code? result;
+
+  bool showDebugInfo = true;
+  int successScans = 0;
+  int failedScans = 0;
+
   @override
   Widget build(BuildContext context) {
     return DefaultTabController(
@@ -52,26 +59,34 @@ class _DemoPageState extends State<DemoPage> {
           physics: const NeverScrollableScrollPhysics(),
           children: [
             if (kIsWeb)
-              Center(
-                child: Text(
-                  'Web is not supported yet.',
-                  style: Theme.of(context).textTheme.headline6,
-                ),
+              const UnsupportedPlatformWidget()
+            else if (result != null)
+              ScanResultWidget(
+                result: result?.text,
+                onScanAgain: () => setState(() => result = null),
               )
             else
-              ReaderWidget(
-                onScan: (value) {
-                  showMessage(context, 'Scanned: ${value.text ?? ''}');
-                },
-                tryInverted: true,
+              Stack(
+                children: [
+                  ReaderWidget(
+                    onScan: _onScanSuccess,
+                    onScanFailure: () => _onScanFailure(null),
+                    tryInverted: true,
+                  ),
+                  ScanFromGalleryWidget(
+                    onScan: _onScanSuccess,
+                    onScanFailure: _onScanFailure,
+                  ),
+                  if (showDebugInfo)
+                    DebugInfoWidget(
+                      successScans: successScans,
+                      failedScans: failedScans,
+                      onReset: _onReset,
+                    ),
+                ],
               ),
             if (kIsWeb)
-              Center(
-                child: Text(
-                  'Web is not supported yet.',
-                  style: Theme.of(context).textTheme.headline6,
-                ),
-              )
+              const UnsupportedPlatformWidget()
             else
               ListView(
                 children: [
@@ -85,7 +100,7 @@ class _DemoPageState extends State<DemoPage> {
                       });
                     },
                     onError: (error) {
-                      showMessage(context, 'Error: $error');
+                      _showMessage(context, 'Error: $error');
                     },
                   ),
                   if (createdCodeBytes != null)
@@ -98,12 +113,162 @@ class _DemoPageState extends State<DemoPage> {
     );
   }
 
-  showMessage(BuildContext context, String message) {
-    debugPrint(message);
+  _onScanSuccess(value) {
+    setState(() {
+      successScans++;
+      result = value;
+    });
+  }
+
+  _onScanFailure(String? error) {
+    setState(() {
+      failedScans++;
+    });
+    if (error != null) {
+      _showMessage(context, error);
+    }
+  }
+
+  _showMessage(BuildContext context, String message) {
     ScaffoldMessenger.of(context).hideCurrentSnackBar();
     ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        content: Text(message),
+      SnackBar(content: Text(message)),
+    );
+  }
+
+  _onReset() {
+    setState(() {
+      successScans = 0;
+      failedScans = 0;
+    });
+  }
+}
+
+class ScanResultWidget extends StatelessWidget {
+  const ScanResultWidget({
+    Key? key,
+    this.result,
+    this.onScanAgain,
+  }) : super(key: key);
+
+  final String? result;
+  final Function()? onScanAgain;
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Text(
+            result ?? '',
+            style: Theme.of(context).textTheme.headline6,
+          ),
+          const SizedBox(height: 20),
+          ElevatedButton(
+            onPressed: onScanAgain,
+            child: const Text('Scan Again'),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class ScanFromGalleryWidget extends StatelessWidget {
+  const ScanFromGalleryWidget({
+    Key? key,
+    this.onScan,
+    this.onScanFailure,
+  }) : super(key: key);
+
+  final Function(Code?)? onScan;
+  final Function(String)? onScanFailure;
+
+  @override
+  Widget build(BuildContext context) {
+    return Positioned(
+      bottom: 20,
+      right: 20,
+      child: FloatingActionButton(
+        onPressed: _onFromGalleryButtonTapped,
+        child: const Icon(Icons.image),
+      ),
+    );
+  }
+
+  void _onFromGalleryButtonTapped() async {
+    final XFile? file =
+        await ImagePicker().pickImage(source: ImageSource.gallery);
+    if (file != null) {
+      final Code? result = await zx.readBarcodeImagePath(
+        file,
+        params: Params(tryInverted: true),
+      );
+      if (result != null && result.isValid) {
+        onScan?.call(result);
+      } else {
+        onScanFailure?.call('Failed to read barcode from image');
+      }
+    }
+  }
+}
+
+class DebugInfoWidget extends StatelessWidget {
+  const DebugInfoWidget({
+    Key? key,
+    required this.successScans,
+    required this.failedScans,
+    this.onReset,
+  }) : super(key: key);
+
+  final int successScans;
+  final int failedScans;
+
+  final Function()? onReset;
+
+  @override
+  Widget build(BuildContext context) {
+    return Align(
+      alignment: Alignment.topCenter,
+      child: Padding(
+        padding: const EdgeInsets.all(8.0),
+        child: ClipRRect(
+          borderRadius: BorderRadius.circular(10),
+          child: Container(
+            color: Colors.white.withOpacity(0.7),
+            padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 5),
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                Text(
+                  'Success: $successScans\nFailed: $failedScans',
+                  style: Theme.of(context).textTheme.headline6,
+                ),
+                TextButton(
+                  onPressed: onReset,
+                  child: const Text('Reset'),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class UnsupportedPlatformWidget extends StatelessWidget {
+  const UnsupportedPlatformWidget({
+    Key? key,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Text(
+        'This platform is not supported yet.',
+        style: Theme.of(context).textTheme.headline6,
       ),
     );
   }

example/pubspec.lock

@@ -148,7 +148,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.9.0"
+    version: "0.9.1"
   font_awesome_flutter:
     dependency: "direct main"
     description:
@@ -204,7 +204,7 @@ packages:
       name: image_picker_ios
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.8.6+4"
+    version: "0.8.6+5"
   image_picker_platform_interface:
     dependency: transitive
     description:

lib/src/logic/barcode_reader.dart

@@ -53,7 +53,22 @@ Code zxingReadBarcode(
   required int width,
   required int height,
   Params? params,
-}) =>
+}) {
+  Code result = _readBarcode(bytes, width, height, params);
+  if (!result.isValid && params != null && params.tryInverted == true) {
+    // try to invert the image and read again
+    final Uint8List invertedBytes = invertImage(bytes);
+    result = _readBarcode(invertedBytes, width, height, params);
+  }
+  return result;
+}
+
+Code _readBarcode(
+  Uint8List bytes,
+  int width,
+  int height,
+  Params? params,
+) =>
     bindings
         .readBarcode(
           bytes.allocatePointer(),

lib/src/logic/barcodes_reader.dart

@@ -54,6 +54,21 @@ List<Code> zxingReadBarcodes(
   required int height,
   Params? params,
 }) {
+  List<Code> results = _readBarcodes(bytes, width, height, params);
+  if (results.isEmpty && params != null && params.tryInverted == true) {
+    // try to invert the image and read again
+    final Uint8List invertedBytes = invertImage(bytes);
+    results = _readBarcodes(invertedBytes, width, height, params);
+  }
+  return results;
+}
+
+List<Code> _readBarcodes(
+  Uint8List bytes,
+  int width,
+  int height,
+  Params? params,
+) {
   final CodeResults result = bindings.readBarcodes(
     bytes.allocatePointer(),
     params?.format ?? Format.any,

lib/src/logic/zxing.dart

@@ -12,6 +12,7 @@ import 'package:image/image.dart' as imglib;
 import '../../generated_bindings.dart';
 import '../models/models.dart';
 import '../utils/extentions.dart';
+import '../utils/image_converter.dart';
 import '../utils/isolate_utils.dart';
 
 part 'barcode_encoder.dart';

lib/src/ui/reader_widget.dart

@@ -13,6 +13,7 @@ class ReaderWidget extends StatefulWidget {
   const ReaderWidget({
     super.key,
     required this.onScan,
+    this.onScanFailure,
     this.onControllerCreated,
     this.codeFormat = Format.any,
     this.tryHarder = false,
@@ -30,6 +31,7 @@ class ReaderWidget extends StatefulWidget {
   });
 
   final Function(Code) onScan;
+  final Function()? onScanFailure;
   final Function(CameraController?)? onControllerCreated;
   final int codeFormat;
   final bool tryHarder;
@@ -183,6 +185,8 @@ class _ReaderWidgetState extends State<ReaderWidget>
           widget.onScan(result);
           setState(() {});
           await Future<void>.delayed(widget.scanDelaySuccess);
+        } else {
+          widget.onScanFailure?.call();
         }
       } on FileSystemException catch (e) {
         debugPrint(e.message);

lib/src/utils/isolate_utils.dart

@@ -58,24 +58,13 @@ class IsolateUtils {
           final CameraImage image = isolateData.cameraImage;
           final Uint8List bytes = await convertImage(image);
 
-          Code result = zxingReadBarcode(
+          final Code result = zxingReadBarcode(
             bytes,
             width: image.width,
             height: image.height,
             params: isolateData.params,
           );
 
-          if (!result.isValid && isolateData.params.tryInverted) {
-            // try to invert the image and read again
-            final Uint8List invertedBytes = invertImage(bytes);
-            result = zxingReadBarcode(
-              invertedBytes,
-              width: image.width,
-              height: image.height,
-              params: isolateData.params,
-            );
-          }
-
           isolateData.responsePort?.send(result);
         } catch (e) {
           isolateData.responsePort?.send(e);