/// <summary>
/// Async loading image from cache or network
/// </summary>
/// <param name="imageUri">Uri of the image to load</param>
/// <returns>BitmapImage if load was successfull or null otherwise</returns>
public virtual async Task <ImagePackage> LoadImage(Image image, Uri uriSource,
CancellationTokenSource cancellationTokenSource)
{
CheckConfig();
ImagePackage imagePackage = null;
var decoders = this.GetAvailableDecoders();
var randStream = await this.LoadImageStream(uriSource, cancellationTokenSource);
if (randStream == null)
{
throw new Exception("stream is null");
}
if (decoders.Count > 0)
{
int maxHeaderSize = decoders.Max(x => x.HeaderSize);
if (maxHeaderSize > 0)
{
byte[] header = new byte[maxHeaderSize];
var readStream = randStream.AsStreamForRead();
readStream.Position = 0;
await readStream.ReadAsync(header, 0, maxHeaderSize);
readStream.Position = 0;
int maxPriority = -1;
IImageDecoder decoder = null;
foreach (var item in decoders)
{
var priority = item.GetPriority(header);
if (priority > maxPriority)
{
maxPriority = priority;
decoder = item;
}
}
if (decoder != null)
{
var package = await decoder.InitializeAsync(image.Dispatcher, image, uriSource, randStream, cancellationTokenSource);
if (!cancellationTokenSource.IsCancellationRequested)
{
imagePackage = package;
//imagePackage?.Decoder?.Start();
}
}
}
}
return(imagePackage);
//var bitmapImage = new BitmapImage();
//var stream = await LoadImageStream(imageUri, cancellationTokenSource);
//await bitmapImage.SetSourceAsync(stream);
//return bitmapImage;
}