Avoid calling Bitmap.asImageBitmap() too often

app/src/main/java/org/mydomain/myscan/view/CameraScreen.kt

@@ -61,6 +61,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.layout.boundsInWindow
@@ -182,13 +183,14 @@ private fun CameraScreenScaffold(
                 )
             }
         }
-        CapturedImage(cameraUiState, thumbnailCoords)
+        cameraUiState.captureState.processedImage?.let {
+            image -> CapturedImage(image.asImageBitmap(), thumbnailCoords)
+        }
     }
 }
 
 @Composable
-private fun CapturedImage(cameraUiState: CameraUiState, thumbnailCoords: MutableState<Offset>) {
-    cameraUiState.captureState.processedImage?.let { image ->
+private fun CapturedImage(image: ImageBitmap, thumbnailCoords: MutableState<Offset>) {
     Surface(
         color = Color.Black.copy(alpha = 0.3f),
         modifier = Modifier.fillMaxSize(),
@@ -217,7 +219,8 @@ private fun CapturedImage(cameraUiState: CameraUiState, thumbnailCoords: Mutable
         label = "scale"
     ) { if (it) 0.3f else 1f }
 
-        Box (modifier = Modifier
+    Box (contentAlignment = Alignment.BottomStart,
+        modifier = Modifier
         .fillMaxHeight(0.8f)
         .onGloballyPositioned { coordinates ->
             val bounds = coordinates.boundsInWindow()
@@ -230,7 +233,7 @@ private fun CapturedImage(cameraUiState: CameraUiState, thumbnailCoords: Mutable
         }
     ) {
         Image(
-                bitmap = image.asImageBitmap(),
+            bitmap = image,
             contentDescription = null,
             modifier = Modifier
                 .fillMaxSize()
@@ -243,7 +246,6 @@ private fun CapturedImage(cameraUiState: CameraUiState, thumbnailCoords: Mutable
                 }
         )
     }
-    }
 }
 
 @Composable