From 7483c8d6ea04866a4749025409b2d0926e251ace Mon Sep 17 00:00:00 2001
From: Tsubasa Kobayashi <tsubasa.kobayashi@neosystem.co.jp>
Date: Wed, 10 Apr 2024 18:05:14 +0900
Subject: [PATCH] =?UTF-8?q?fix:=20=E4=B8=80=E9=83=A8=E3=81=AEAndroid?=
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reference: https://github.com/Redth/ZXing.Net.Maui/issues/107
---
 .../Android/CameraManager.android.cs          |  1 +
 ZXing.Net.MAUI/ZXingBarcodeReader.cs          | 41 ++++++++++++++++---
 2 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs b/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs
index 51b52f9..3d17430 100644
--- a/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs
+++ b/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs
@@ -66,6 +66,7 @@ public void Connect()
 				imageAnalyzer = new ImageAnalysis.Builder()
 					.SetDefaultResolution(new Android.Util.Size(640, 480))
 					//.SetOutputImageRotationEnabled(true) // FIXED: Could not read QRCode.
+					.SetOutputImageFormat(ImageAnalysis.OutputImageFormatRgba8888)
 					.SetBackpressureStrategy(ImageAnalysis.StrategyKeepOnlyLatest)
 					.Build();
 
diff --git a/ZXing.Net.MAUI/ZXingBarcodeReader.cs b/ZXing.Net.MAUI/ZXingBarcodeReader.cs
index d10cc1d..a96c013 100644
--- a/ZXing.Net.MAUI/ZXingBarcodeReader.cs
+++ b/ZXing.Net.MAUI/ZXingBarcodeReader.cs
@@ -1,5 +1,4 @@
-using Microsoft.Maui.Graphics;
-
+
 namespace ZXing.Net.Maui.Readers
 {
 	public class ZXingBarcodeReader : Readers.IBarcodeReader
@@ -34,14 +33,15 @@ public BarcodeResult[] Decode(PixelBufferHolder image)
 			LuminanceSource ls = default;
 
 #if ANDROID
-			ls = new ByteBufferYUVLuminanceSource(image.Data, w, h, 0, 0, w, h);
+            Java.Nio.ByteBuffer imageData = Bitmap2Yuv420p(image.Data, w, h);
+            ls = new ByteBufferYUVLuminanceSource(imageData, w, h, 0, 0, w, h);
 #elif MACCATALYST || IOS
 			ls = new CVPixelBufferBGRA32LuminanceSource(image.Data, w, h);
 #elif WINDOWS
 			ls = new SoftwareBitmapLuminanceSource(image.Data);
 #endif
 
-			if (Options.Multiple)
+            if (Options.Multiple)
 				return zxingReader.DecodeMultiple(ls)?.ToBarcodeResults();
 
 			var b = zxingReader.Decode(ls)?.ToBarcodeResult();
@@ -50,5 +50,36 @@ public BarcodeResult[] Decode(PixelBufferHolder image)
 
 			return null;
 		}
-	}
+
+#if ANDROID
+        public static unsafe Java.Nio.ByteBuffer Bitmap2Yuv420p(Java.Nio.ByteBuffer buffer, int w, int h)
+        {
+            byte[] image = new byte[buffer.Remaining()];
+            buffer.Get(image);
+
+            byte[] imageYuv = new byte[w * h];
+
+            fixed (byte* packet = image)
+            {
+                byte* pimage = packet;
+
+                fixed (byte* packetOut = imageYuv)
+                {
+                    byte* pimageOut = packetOut;
+
+                    for (int i = 0; i < (w * h); i++)
+                    {
+                        byte r = *pimage++;
+                        byte g = *pimage++;
+                        byte b = *pimage++;
+                        pimage++;   // a
+                        *pimageOut++ = (byte)(((66 * r + 129 * g + 25 * b) >> 8) + 16);
+                    }
+                }
+            }
+
+            return Java.Nio.ByteBuffer.Wrap(imageYuv);
+        }
+#endif
+    }
 }