Fix QR scanning issues.

qr/app/build.gradle

@@ -11,4 +11,7 @@ dependencies {
     implementation libs.rxjava3.rxjava
     implementation libs.rxjava3.rxandroid
     implementation libs.rxjava3.rxkotlin
+
+    implementation libs.google.zxing.android.integration
+    implementation libs.google.zxing.core
 }

qr/app/src/main/java/org/signal/qrtest/QrMainActivity.kt

@@ -1,14 +1,23 @@
 package org.signal.qrtest
 
+import android.annotation.SuppressLint
+import android.graphics.Bitmap
 import android.os.Build
 import android.os.Bundle
+import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.AppCompatImageView
+import com.google.zxing.PlanarYUVLuminanceSource
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
 import io.reactivex.rxjava3.kotlin.subscribeBy
+import org.signal.core.util.ThreadUtil
+import org.signal.qr.ImageProxyLuminanceSource
+import org.signal.qr.QrProcessor
 import org.signal.qr.QrScannerView
 
 class QrMainActivity : AppCompatActivity() {
+  @SuppressLint("NewApi", "SetTextI18n")
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     setContentView(R.layout.activity_main)
@@ -20,9 +29,32 @@ class QrMainActivity : AppCompatActivity() {
     val scanner = findViewById<QrScannerView>(R.id.scanner)
     scanner.start(this)
 
+    val qrText = findViewById<TextView>(R.id.text_qr_data)
+
     scanner.qrData
       .distinctUntilChanged()
       .observeOn(AndroidSchedulers.mainThread())
-      .subscribeBy { Toast.makeText(this, it, Toast.LENGTH_SHORT).show() }
+      .subscribeBy {
+        qrText.text = it
+        Toast.makeText(this, it, Toast.LENGTH_SHORT).show()
+      }
+
+    val sourceView = findViewById<AppCompatImageView>(R.id.scanner_source)
+    val qrSize = findViewById<TextView>(R.id.text_size)
+
+    QrProcessor.listener = { source ->
+      val bitmap = when (source) {
+        is ImageProxyLuminanceSource -> Bitmap.createBitmap(source.render(), 0, source.width, source.width, source.height, Bitmap.Config.ARGB_8888)
+        is PlanarYUVLuminanceSource -> Bitmap.createBitmap(source.renderThumbnail(), 0, source.thumbnailWidth, source.thumbnailWidth, source.thumbnailHeight, Bitmap.Config.ARGB_8888)
+        else -> null
+      }
+
+      if (bitmap != null) {
+        ThreadUtil.runOnMain {
+          qrSize.text = "${bitmap.width} x ${bitmap.height}"
+          sourceView.setImageBitmap(bitmap)
+        }
+      }
+    }
   }
 }

qr/app/src/main/res/layout/activity_main.xml

@@ -10,11 +10,26 @@
         android:gravity="center_horizontal"
         android:orientation="vertical">
 
+        <TextView
+            android:id="@+id/text_qr_data"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"/>
+
+        <TextView
+            android:id="@+id/text_size"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"/>
+
         <org.signal.qr.QrScannerView
             android:id="@+id/scanner"
             android:layout_width="240dp"
             android:layout_height="240dp" />
 
+        <androidx.appcompat.widget.AppCompatImageView
+            android:id="@+id/scanner_source"
+            android:layout_width="240dp"
+            android:layout_height="240dp" />
+
     </LinearLayout>
 
 </FrameLayout>

qr/lib/src/main/java/org/signal/qr/QrProcessor.kt

@@ -45,6 +45,8 @@ class QrProcessor {
         previousHeight = source.height
       }
 
+      listener?.invoke(source)
+
       val bitmap = BinaryBitmap(HybridBinarizer(source))
       val result: Result? = reader.decode(bitmap, mapOf(DecodeHintType.TRY_HARDER to true, DecodeHintType.CHARACTER_SET to "ISO-8859-1"))
 
@@ -65,5 +67,7 @@ class QrProcessor {
 
   companion object {
     private val TAG = Log.tag(QrProcessor::class.java)
+
+    var listener: ((LuminanceSource) -> Unit)? = null
   }
 }

qr/lib/src/main/java/org/signal/qr/ScannerView21.kt

@@ -74,7 +74,7 @@ internal class ScannerView21 constructor(
     val preview = Preview.Builder().build()
 
     val imageAnalysis = ImageAnalysis.Builder()
-      .setTargetResolution(Size(1920, 1080))
+      .setTargetResolution(Size(1280, 960))
       .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
       .build()