A picasso transform that creates a mirror (flip X) image.

Picasso mirror transform

    private final Transformation mirror = new Transformation() {
        @Override
        public Bitmap transform(Bitmap source) {
            Matrix m = new Matrix();
            m.preScale(-1, 1);
            Bitmap src = source;
            Bitmap dst = Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(), m, false);
            dst.setDensity(DisplayMetrics.DENSITY_DEFAULT);
            src.recycle();
            return dst;
        }

        @Override
        public String key() {
            return "mirror";
        }
    };