rotateBitmap.kt

fun rotateBitmap(context: Context, bitmap: Bitmap): Bitmap{
    val rs = RenderScript.create(context)
    val allocation = Allocation.createFromBitmap(rs, bitmap)

    val rotated = Allocation.createTyped(rs, Type.createXY(rs, Element.RGBA_8888(rs), bitmap.height, bitmap.width))
    ScriptC_rotator(rs).apply {
        _inImage = allocation
        _inHeight = bitmap.height
        _inWidth = bitmap.width
        forEach_rotate_270_clockwise(rotated, rotated)
    }
    rs.destroy()

    val bitmapImage = Bitmap.createBitmap(bitmap.height, bitmap.width, Bitmap.Config.ARGB_8888)

    bitmapImage.copyPixelsFromBuffer(rotated.byteBuffer)
    return bitmapImage
}