Compose Bitmaps

private Bitmap compose(Bitmap src, Bitmap sign) {

        Bitmap finalBitmap = Bitmap.createBitmap(src.getWidth(),
                src.getHeight(), src.getConfig());

        float ratio = (float) src.getWidth() / sign.getWidth();
        int signW = src.getWidth();
        int signH = (int) (sign.getHeight() * ratio);

        Bitmap tmpSign = Bitmap.createScaledBitmap(sign, signW, signH, true);

        sign.recycle();
        sign = tmpSign;

        Canvas canvas = new Canvas(finalBitmap);

        canvas.drawBitmap(src, new Matrix(), null);
        canvas.drawBitmap(sign, new Matrix(), null);
        return finalBitmap;
    }