Image Note

간단하게 이미지의 스케일을 변경한다. Bound와 Flip 등의 기능이 가능, 예제에서 찾아서 남김

 

        private async void OnDeferredImageRequestedHandler(DataProviderRequest providerRequest, StorageFile imageFile)
        {
            // In this delegate we provide updated Bitmap data using delayed rendering.

            if (imageFile != null)
            {
                // If the delegate is calling any asynchronous operations it needs to acquire the deferral first. This lets the
                // system know that you are performing some operations that might take a little longer and that the call to
                // SetData could happen after the delegate returns. Once you acquired the deferral object you must call Complete
                // on it after your final call to SetData.
                DataProviderDeferral deferral = providerRequest.GetDeferral();
                InMemoryRandomAccessStream inMemoryStream = new InMemoryRandomAccessStream();

                // Make sure to always call Complete when done with the deferral.
                try
                {
                    // Decode the image and re-encode it at 50% width and height.
                    IRandomAccessStream imageStream = await imageFile.OpenAsync(FileAccessMode.Read);
                    BitmapDecoder imageDecoder = await BitmapDecoder.CreateAsync(imageStream);
                    BitmapEncoder imageEncoder = await BitmapEncoder.CreateForTranscodingAsync(inMemoryStream, imageDecoder);
                    imageEncoder.BitmapTransform.ScaledWidth = (uint)(imageDecoder.OrientedPixelWidth * 0.5);
                    imageEncoder.BitmapTransform.ScaledHeight = (uint)(imageDecoder.OrientedPixelHeight * 0.5);

                    await imageEncoder.FlushAsync();

                    providerRequest.SetData(RandomAccessStreamReference.CreateFromStream(inMemoryStream));
                }
                finally
                {
                    deferral.Complete();
                }
            }
        }