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fun drawableToBitmap(drawable: Drawable): Bitmap? {
    var bitmap: Bitmap? = null
    if (drawable is BitmapDrawable) {
        if (drawable.bitmap != null) {
            return drawable.bitmap
        }
    }
    bitmap = if (drawable.intrinsicWidth <= 0 || drawable.intrinsicHeight <= 0) {
        Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888) // Single color bitmap will be created of 1x1 pixel
    } else {
        Bitmap.createBitmap(drawable.intrinsicWidth, drawable.intrinsicHeight, Bitmap.Config.ARGB_8888)
    }
    val canvas = Canvas(bitmap)
    drawable.setBounds(0, 0, canvas.width, canvas.height)
    drawable.draw(canvas)
    return bitmap
}