Bitmap

Create a new Shader and assign it to Paint. You can use whichever TileMode you like because the shape being drawn isn't larger than the original Bitmap.

fun roundCorners(bmp: Bitmap, radius: Int): Bitmap {
    require(radius > 0)
    val rounded = Bitmap.createBitmap(bmp.width, bmp.height, Bitmap.Config.ARGB_8888)
    Canvas(rounded).drawRoundRect(
        0f, 0f, bmp.width.toFloat(), bmp.height.toFloat(),
        radius.toFloat(), radius.toFloat(),
        Paint(Paint.ANTI_ALIAS_FLAG).apply {
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        }
    )
    return rounded
}