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116 changes: 106 additions & 10 deletions
116
BarcodeScanning.Native.Maui/Platform/Android/BarcodeAnalyzer.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,43 +1,139 @@ | ||
| using AndroidX.Camera.Core; | ||
| using Android.Gms.Tasks; | ||
| using AndroidX.Camera.Core; | ||
| using AndroidX.Camera.View.Transform; | ||
| using Microsoft.Maui.Graphics.Platform; | ||
| using System.Diagnostics; | ||
| using Xamarin.Google.MLKit.Vision.Common; | ||
|
|
||
| using Size = Android.Util.Size; | ||
|
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| namespace BarcodeScanning; | ||
|
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| internal class BarcodeAnalyzer : Java.Lang.Object, ImageAnalysis.IAnalyzer | ||
| internal class BarcodeAnalyzer : Java.Lang.Object, ImageAnalysis.IAnalyzer, IOnSuccessListener, IOnCompleteListener | ||
| { | ||
| public Size DefaultTargetResolution => Methods.TargetResolution(CaptureQuality.Medium); | ||
| public int TargetCoordinateSystem => ImageAnalysis.CoordinateSystemOriginal; | ||
|
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| private CoordinateTransform _coordinateTransform; | ||
| private bool _processInverted; | ||
| private IImageProxy _proxy; | ||
|
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| private readonly HashSet<BarcodeResult> _barcodeResults; | ||
| private readonly CameraManager _cameraManager; | ||
|
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| internal BarcodeAnalyzer(CameraManager cameraManager) | ||
| { | ||
| _barcodeResults = []; | ||
| _cameraManager = cameraManager; | ||
| _processInverted = false; | ||
| } | ||
|
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| public void Analyze(IImageProxy proxy) | ||
| { | ||
| try | ||
| { | ||
| _cameraManager?.AnalyzeFrame(proxy); | ||
| _proxy = proxy; | ||
| _barcodeResults.Clear(); | ||
|
|
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| if (_cameraManager.CameraView.CaptureNextFrame) | ||
| { | ||
| _cameraManager.CameraView.CaptureNextFrame = false; | ||
| var image = new PlatformImage(_proxy.ToBitmap()); | ||
| _cameraManager.CameraView.TriggerOnImageCaptured(image); | ||
| } | ||
|
|
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| if (_cameraManager.RecalculateCoordinateTransform || _coordinateTransform is null) | ||
| _coordinateTransform = _cameraManager.GetCoordinateTransform(_proxy); | ||
|
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| _processInverted = _cameraManager.CameraView.ForceInverted; | ||
| using var inputImage = InputImage.FromMediaImage(_proxy.Image, _proxy.ImageInfo.RotationDegrees); | ||
| _cameraManager.BarcodeScanner.Process(inputImage).AddOnSuccessListener(this).AddOnCompleteListener(this); | ||
| } | ||
| catch (Exception ex) | ||
| catch (Exception) | ||
| { | ||
| Debug.WriteLine(ex); | ||
| CloseProxy(); | ||
| } | ||
| } | ||
|
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| public void OnSuccess(Java.Lang.Object result) | ||
| { | ||
| try | ||
| { | ||
| Methods.ProcessBarcodeResult(result, _barcodeResults, _coordinateTransform); | ||
|
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| if (!_processInverted) | ||
| { | ||
| if (_cameraManager.CameraView.AimMode) | ||
| { | ||
| var previewCenter = new Point(_cameraManager.PreviewView.Width / 2, _cameraManager.PreviewView.Height / 2); | ||
|
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| foreach (var barcode in _barcodeResults) | ||
| { | ||
| if (!barcode.PreviewBoundingBox.Contains(previewCenter)) | ||
| _barcodeResults.Remove(barcode); | ||
| } | ||
| } | ||
|
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| if (_cameraManager.CameraView.ViewfinderMode) | ||
| { | ||
| var previewRect = new RectF(0, 0, _cameraManager.PreviewView.Width, _cameraManager.PreviewView.Height); | ||
|
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| foreach (var barcode in _barcodeResults) | ||
| { | ||
| if (!previewRect.Contains(barcode.PreviewBoundingBox)) | ||
| _barcodeResults.Remove(barcode); | ||
| } | ||
| } | ||
|
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| _cameraManager?.CameraView?.DetectionFinished(_barcodeResults); | ||
| } | ||
| } | ||
| finally | ||
| catch (Exception) | ||
| { | ||
| } | ||
| } | ||
|
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| public void OnComplete(Android.Gms.Tasks.Task task) | ||
| { | ||
| if (_processInverted) | ||
| { | ||
| try | ||
| { | ||
| proxy?.Close(); | ||
| Methods.InvertLuminance(_proxy.Image); | ||
|
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| _processInverted = false; | ||
| using var inputImage = InputImage.FromMediaImage(_proxy.Image, _proxy.ImageInfo.RotationDegrees); | ||
| _cameraManager.BarcodeScanner.Process(inputImage).AddOnSuccessListener(this).AddOnCompleteListener(this); | ||
| } | ||
| catch (Exception ex) | ||
| catch (Exception) | ||
| { | ||
| Debug.WriteLine(ex); | ||
| MainThread.BeginInvokeOnMainThread(() => _cameraManager?.Start()); | ||
| CloseProxy(); | ||
| } | ||
| } | ||
| else | ||
| { | ||
| CloseProxy(); | ||
| } | ||
|
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| } | ||
|
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| private void CloseProxy() | ||
| { | ||
| try | ||
| { | ||
| _proxy?.Close(); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| Debug.WriteLine(ex); | ||
| MainThread.BeginInvokeOnMainThread(() => _cameraManager?.Start()); | ||
| } | ||
| } | ||
|
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| protected override void Dispose(bool disposing) | ||
| { | ||
| _coordinateTransform?.Dispose(); | ||
|
|
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| base.Dispose(disposing); | ||
| } | ||
| } |
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