ac5

private fun updateTransform() {
    val matrix = Matrix()

    // Compute the center of the view finder
    val centerX = viewFinder.width / 2f
    val centerY = viewFinder.height / 2f

    // Correct preview output to account for display rotation
    val rotationDegrees = when(viewFinder.display.rotation) {
        Surface.ROTATION_0 -> 0
        Surface.ROTATION_90 -> 90
        Surface.ROTATION_180 -> 180
        Surface.ROTATION_270 -> 270
        else -> return
    }
    matrix.postRotate(-rotationDegrees.toFloat(), centerX, centerY)

    // Finally, apply transformations to our TextureView
    viewFinder.setTransform(matrix)
}