public async static Task <BitmapSource> LoadImageAsync(Stream imageStream)
{
if (imageStream == null)
{
return(null);
}
#if WINDOWS_PHONE
BitmapImage bmp = null;
try
{
bmp = new BitmapImage();
bmp.SetSource(imageStream);
}
catch (Exception ex)
{
Log.WriteLine("LoadImageAsync failed: " + ex.Message);
}
await Task.Delay(1);
#else
WriteableBitmap bmp = null;
try
{
var stream = await ConvertStream(imageStream);
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(stream);
// convert to a writable bitmap so we can get the PixelBuffer back out later...
// in case we need to edit and/or re-encode the image.
bmp = new WriteableBitmap((int)decoder.PixelHeight, (int)decoder.PixelWidth);
// remember the format of this image
PixelBufferObject.SetBitmapPixelFormat(bmp, decoder.BitmapPixelFormat);
PixelBufferObject.SetBitmapAlphaMode(bmp, decoder.BitmapAlphaMode);
stream.Seek(0);
bmp.SetSource(stream);
imageStream.Dispose();
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
#endif
return(bmp);
}
public async static Task SaveImageAsync(BitmapSource image, IRandomAccessStream file)
{
BitmapEncoder encoder = await BitmapEncoder.CreateAsync(Windows.Graphics.Imaging.BitmapEncoder.PngEncoderId, file);
WriteableBitmap writeable = image as WriteableBitmap;
if (writeable == null)
{
return;
}
// remember the format of this image
BitmapPixelFormat format = PixelBufferObject.GetBitmapPixelFormat(writeable);
BitmapAlphaMode mode = PixelBufferObject.GetBitmapAlphaMode(writeable);
IBuffer buffer = writeable.PixelBuffer;
DataReader dataReader = DataReader.FromBuffer(buffer);
byte[] pixels = new byte[buffer.Length];
dataReader.ReadBytes(pixels);
encoder.SetPixelData(format, mode, (uint)image.PixelWidth, (uint)image.PixelHeight, 96, 96, pixels);
await encoder.FlushAsync();
}