Add QR code outline

app/src/main/java/org/thoughtcrime/securesms/onboarding/LinkDeviceActivity.kt

@@ -11,10 +11,12 @@ import androidx.camera.core.Preview
 import androidx.camera.lifecycle.ProcessCameraProvider
 import androidx.camera.view.PreviewView
 import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
@@ -41,6 +43,7 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.ComposeView
 import androidx.compose.ui.platform.LocalContext
@@ -190,14 +193,25 @@ class LinkDeviceActivity : BaseActionBarActivity() {
 
 @Composable
 fun ScanQrCode(preview: Preview) {
-    AndroidView(
+    Box {
-        modifier = Modifier.fillMaxSize(),
+        AndroidView(
-        factory = { context ->
+            modifier = Modifier.fillMaxSize(),
-            PreviewView(context).apply {
+            factory = { context ->
-                preview.setSurfaceProvider(surfaceProvider)
+                PreviewView(context).apply {
+                    preview.setSurfaceProvider(surfaceProvider)
+                }
             }
-        }
+        )
-    )
+
+        Box(
+            Modifier
+                .aspectRatio(1f)
+                .padding(20.dp)
+                .clip(shape = RoundedCornerShape(20.dp))
+                .background(Color(0x33ffffff))
+                .align(Alignment.Center)
+        )
+    }
 }
 
 @Composable