static void NotifyJobDone(BitmapRequest req)
{
if (req.Handle.IsDisposed
|| req.Callback == null)
{
req.CleanUp();
return;
}
req.Callback(req.CreateLoadingResult());
req.CleanUp();
}
/// <summary>
/// Generate STREAM and
/// push it to bitmap loading observable
/// </summary>
/// <param name="req"></param>
static void GenerateStreamAndPush(BitmapRequest req)
{
if (req.Handle.IsDisposed)
{
req.CleanUp();
return;
}
if (string.IsNullOrEmpty(req.ResourcePath) == false)
{
var stminfo = Application.GetResourceStream(new Uri(req.ResourcePath, UriKind.Relative));
if (null == stminfo
|| null == stminfo.Stream)
{
req.Stream = null;
req.Succeeded = false;
req.ErrorMessage = "Failed to get resource stream";
_requestdoneob.OnNext(req);
return;
}
req.Stream = MemoryStreamFromStream(stminfo.Stream);
_streamob.OnNext(req);
return;
}
if (string.IsNullOrEmpty(req.IsoPath) == false)
{
byte[] buf = StorageIo.ReadBinaryFile(req.IsoPath);
if (null == buf)
{
Debug.WriteLine("Unable to read a file:{0}", req.IsoPath);
req.Stream = null;
req.Succeeded = false;
req.ErrorMessage = "Unable to read file";
_requestdoneob.OnNext(req);
return;
}
req.Stream = new MemoryStream(buf);
_streamob.OnNext(req);
return;
}
//
// Unrecharable.
//
Debug.Assert(false);
}
/// <summary>
/// Generate bitmap image and start background loading
/// </summary>
/// <param name="req"></param>
static void GenerateBackgroundBitmapLoadingAndPush(BitmapRequest req)
{
if (req.Handle.IsDisposed)
{
req.CleanUp();
return;
}
var bmp = new BitmapImage
{
CreateOptions = BitmapCreateOptions.BackgroundCreation
};
var opensucceeded = Observable.FromEventPattern<RoutedEventArgs>(
h => bmp.ImageOpened += h,
h => bmp.ImageOpened -= h)
.Select<EventPattern<RoutedEventArgs>, EventArgs>(x => x.EventArgs as EventArgs);
var openfailed =
Observable.FromEventPattern<ExceptionRoutedEventArgs>(
h => bmp.ImageFailed += h,
h => bmp.ImageFailed -= h)
.Select<EventPattern<ExceptionRoutedEventArgs>, EventArgs>(x => x.EventArgs as EventArgs);
req.BmpLoadingSubscription =
Observable.Amb(opensucceeded, openfailed)
.Do(x => Debug.WriteLine("bitmap loaded: Received request - {0}", req.IsoPath))
.Subscribe
(args =>
{
--_numprocessing;
if (req.Handle.IsDisposed)
{
req.CleanUp();
return;
}
if (args is ExceptionRoutedEventArgs)
{
req.Succeeded = false;
req.ErrorMessage = (args as ExceptionRoutedEventArgs).ErrorException.ToString();
_requestdoneob.OnNext(req);
return;
}
if (args is RoutedEventArgs)
{
req.Succeeded = true;
req.BmpWidth = req.Bmp.PixelWidth;
req.BmpHeight = req.Bmp.PixelHeight;
_requestdoneob.OnNext(req);
return;
}
}
);
++_numprocessing;
req.Bmp = bmp;
bmp.SetSource(req.Stream);
}
public static IDisposable LoadIsoBitmapAsync(
string path,
Action<LoadingResult> callback)
{
var req = new BitmapRequest
{
Id = Guid.NewGuid().ToString(),
Handle = new BooleanDisposable(),
IsoPath = path,
Callback = callback
};
_requestob.OnNext(req);
return req.Handle;
}
