Bitmap 테두리 Rounding 처리

public class BitmapUtils {
  private static final int ROUND_DIPS = 10;

  public static Bitmap getRoundedCornerBitmap(Context context, Bitmap bitmap) {
      Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
      Canvas canvas = new Canvas(output);

      final int color = 0xff424242;
      final Paint paint = new Paint();
      final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
      final RectF rectF = new RectF(rect);
      final float roundPx = convertDipsToPixels(context, ROUND_DIPS);

      paint.setAntiAlias(true);
      canvas.drawARGB(0, 0, 0, 0);
      paint.setColor(color);
      canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

      paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
      canvas.drawBitmap(bitmap, rect, rect, paint);

      return output;
  }

  public static int convertDipsToPixels(Context context, int dips) {
      final float scale = context.getResources().getDisplayMetrics().density;
      return (int) (dips * scale + 0.5f);
  }
}