public class GlideRoundTransform extends BitmapTransformation {
    private static float radius = 0f;
    private static final String ID = "com.bumptech.glide.load.resource.bitmap.FillSpace";
    private static final byte[] ID_BYTES = ID.getBytes(CHARSET);

    public GlideRoundTransform(Context context) {
        this(4);
    }

    public GlideRoundTransform(int dp) {
        radius = (Resources.getSystem().getDisplayMetrics().density * dp);
    }

    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        Bitmap bitmap = TransformationUtils.centerCrop(pool, toTransform, outWidth, outHeight);
        return roundCrop(pool, bitmap);
    }

    private static Bitmap roundCrop(BitmapPool pool, Bitmap source) {
        if (source == null) {
            return null;
        }
        Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());
        canvas.drawRoundRect(rectF, radius, radius, paint);
        return result;
    }

    public String getId() {
        return getClass().getName() + Math.round(radius);
    }

    @Override
    public boolean equals(Object o) {
        if (o instanceof GlideRoundTransform) {
            GlideRoundTransform other = (GlideRoundTransform) o;
            return radius == other.radius;
        }
        return false;
    }

    @Override
    public int hashCode() {
        return Util.hashCode(ID.hashCode(),
                Util.hashCode(radius));
    }

    @Override
    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
        messageDigest.update(ID_BYTES);

        byte[] radiusData = ByteBuffer.allocate(4).putFloat(radius).array();
        messageDigest.update(radiusData);
    }
}