I’m trying to apply YUV (Media.Image) to RGB (Bitmap) conversion in Android. I am currently using this official code from Android Camera samples (the code below) but it uses RenderScript which is going to be deprecated.

I developed the following function but it is not efficient and it takes 2x-3x more time to execute compared the official Renderscript-based code.

How can I rewrite it to be nearly as efficient as the RenderScript solution? Any Android native solutions available?

   public Bitmap imageToBitmap(Image image, float rotationDegrees) {

        assert (image.getFormat() == ImageFormat.YUV_420_888);

        // NV21 is a plane of 8 bit Y values followed by interleaved  Cb Cr
        ByteBuffer ib = ByteBuffer.allocate(image.getHeight() * image.getWidth() * 2);

        ByteBuffer y = image.getPlanes()[0].getBuffer();
        ByteBuffer cr = image.getPlanes()[1].getBuffer();
        ByteBuffer cb = image.getPlanes()[2].getBuffer();
        ib.put(y);
        ib.put(cb);
        ib.put(cr);

        YuvImage yuvImage = new YuvImage(ib.array(),
                ImageFormat.NV21, image.getWidth(), image.getHeight(), null);

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        yuvImage.compressToJpeg(new Rect(0, 0,
                image.getWidth(), image.getHeight()), 50, out);
        byte[] imageBytes = out.toByteArray();
        Bitmap bm = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length);
        Bitmap bitmap = bm;

        // On android the camera rotation and the screen rotation
        // are off by 90 degrees, so if you are capturing an image
        // in "portrait" orientation, you'll need to rotate the image.
        if (rotationDegrees != 0) {
            Matrix matrix = new Matrix();
            matrix.postRotate(rotationDegrees);
            Bitmap scaledBitmap = Bitmap.createScaledBitmap(bm,
                    bm.getWidth(), bm.getHeight(), true);
            bitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
                    scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, true);
        }
        return bitmap;
    }