bykovme/nswallet

using System.IO;
using Android.Graphics;
using Xamarin.Forms;
using NSWallet.Droid.Helpers.Media;
using NSWallet.NetStandard.DependencyServices.MediaService.Interfaces;

[assembly: Dependency(typeof(MediaService))]
namespace NSWallet.Droid.Helpers.Media
{
    public class MediaService : IMediaService
    {
        public byte[] ResizeImage(byte[] imageData, float width, float height)
        {
            var options = new BitmapFactory.Options {
                InPurgeable = true
            };
            var originalImage = BitmapFactory.DecodeByteArray(imageData, 0, imageData.Length, options);

            float newHeight = 0;
            float newWidth = 0;

            var originalHeight = originalImage.Height;
            var originalWidth = originalImage.Width;

            if (originalHeight > originalWidth) {
                newHeight = height;
                float ratio = originalHeight / height;
                newWidth = originalWidth / ratio;
            } else {
                newWidth = width;
                float ratio = originalWidth / width;
                newHeight = originalHeight / ratio;
            }

            var resizedImage = Bitmap.CreateScaledBitmap(originalImage, (int)newWidth, (int)newHeight, true);
            originalImage.Recycle();

            using (MemoryStream ms = new MemoryStream()) {
                resizedImage.Compress(Bitmap.CompressFormat.Png, 100, ms);
                resizedImage.Recycle();
                return ms.ToArray();
            }
        }
    }
}