///
/// Marshal an exception to the Dispatcher thread
///
private static void MarshalException(
QueueEntry entry,
Exception e
)
{
lock (_syncLock)
{
// Fire download completion event for each decoder
foreach (WeakReference decoderReference in entry.decoders)
{
LateBoundBitmapDecoder decoder = decoderReference.Target as LateBoundBitmapDecoder;
if (decoder != null)
{
MarshalEvents(
decoder,
new DispatcherOperationCallback(decoder.ExceptionCallback),
e
);
}
}
if (entry.inputUri != null)
{
lock (_syncLock)
{
_uriTable[entry.inputUri] = null;
}
}
}
}
/// Called when download fails
private void OnDownloadFailed(object sender, ExceptionEventArgs e)
{
//
// The sender should be the LateBoundDecoder that we hooked when it was _decoder.
//
LateBoundBitmapDecoder decoder = (LateBoundBitmapDecoder)sender;
//
// Unhook the decoders download events
//
decoder.DownloadCompleted -= OnDownloadCompleted;
decoder.DownloadProgress -= OnDownloadProgress;
decoder.DownloadFailed -= OnDownloadFailed;
_failedEvent.InvokeEvents(this, e);
}
///
/// Marshals a call to the Dispatcher thread
///
private static void MarshalEvents(
LateBoundBitmapDecoder decoder,
DispatcherOperationCallback doc,
object arg
)
{
Dispatcher dispatcher = decoder.Dispatcher;
if (dispatcher != null)
{
dispatcher.BeginInvoke(DispatcherPriority.Normal, doc, arg);
}
else
{
// Decoder seems to be thread free. This is probably bad
Debug.Assert(false);
}
}
internal BitmapFrameDecode(
int frameNumber,
BitmapCreateOptions createOptions,
BitmapCacheOption cacheOption,
LateBoundBitmapDecoder decoder
) : base(true)
{
_bitmapInit.BeginInit();
_frameNumber = frameNumber;
byte[] pixels = new byte[4];
BitmapSource source = BitmapSource.Create(
1,
1,
96,
96,
PixelFormats.Pbgra32,
null,
pixels,
4
);
WicSourceHandle = source.WicSourceHandle;
Debug.Assert(decoder != null);
_decoder = decoder;
_createOptions = createOptions;
_cacheOption = cacheOption;
//
// Hook the decoders download events
//
_decoder.DownloadCompleted += OnDownloadCompleted;
_decoder.DownloadProgress += OnDownloadProgress;
_decoder.DownloadFailed += OnDownloadFailed;
_bitmapInit.EndInit();
}
internal BitmapFrameDecode(
int frameNumber,
BitmapCreateOptions createOptions,
BitmapCacheOption cacheOption,
LateBoundBitmapDecoder decoder
) : base(true)
{
_bitmapInit.BeginInit();
_frameNumber = frameNumber;
byte[] pixels = new byte[4];
BitmapSource source = BitmapSource.Create(
1,
1,
96,
96,
PixelFormats.Pbgra32,
null,
pixels,
4
);
WicSourceHandle = source.WicSourceHandle;
Debug.Assert(decoder != null);
_decoder = decoder;
_createOptions = createOptions;
_cacheOption = cacheOption;
//
// Hook the decoders download events
//
_decoder.DownloadCompleted += OnDownloadCompleted;
_decoder.DownloadProgress += OnDownloadProgress;
_decoder.DownloadFailed += OnDownloadFailed;
_bitmapInit.EndInit();
}
///
/// Read callback
///
private static void ReadCallback(IAsyncResult result)
{
QueueEntry entry = (QueueEntry)result.AsyncState;
int bytesRead = 0;
#pragma warning disable 6500
try
{
bytesRead = entry.inputStream.EndRead(result);
}
catch (Exception e)
{
MarshalException(entry, e);
}
#pragma warning restore 6500
if (bytesRead == 0)
{
//
// We're done reading from the input stream.
//
entry.inputStream.Close();
entry.inputStream = null;
//
// We're done writing to the output stream. Make sure everything
// is written to disk.
//
entry.outputStream.Flush();
entry.outputStream.Seek(0, SeekOrigin.Begin);
lock (_syncLock)
{
// Fire download progress & completion event for each decoder
foreach (WeakReference decoderReference in entry.decoders)
{
LateBoundBitmapDecoder decoder = decoderReference.Target as LateBoundBitmapDecoder;
if (decoder != null)
{
//
// Marshal events to UI thread
//
MarshalEvents(
decoder,
new DispatcherOperationCallback(decoder.ProgressCallback),
100
);
MarshalEvents(
decoder,
new DispatcherOperationCallback(decoder.DownloadCallback),
entry.outputStream
);
}
}
}
// Delete entry from uri table
if (entry.inputUri != null)
{
lock (_syncLock)
{
_uriTable[entry.inputUri] = null;
}
}
}
else
{
entry.outputStream.Write(entry.readBuffer, 0, bytesRead);
if (entry.contentLength > 0)
{
int percentComplete = (int)Math.Floor(100.0 * (double)entry.outputStream.Length / (double)entry.contentLength);
// Only raise if percentage went up by ~1% (ie value changed).
if (percentComplete != entry.lastPercent)
{
// Update last value
entry.lastPercent = percentComplete;
lock (_syncLock)
{
// Fire download progress event for each decoder
foreach (WeakReference decoderReference in entry.decoders)
{
LateBoundBitmapDecoder decoder = decoderReference.Target as LateBoundBitmapDecoder;
if (decoder != null)
{
//
// Marshal events to UI thread
//
MarshalEvents(
decoder,
new DispatcherOperationCallback(decoder.ProgressCallback),
percentComplete
);
}
}
}
}
}
_workQueue.Enqueue(entry);
_waitEvent.Set();
}
}
///
/// Marshals a call to the Dispatcher thread
///
private static void MarshalEvents(
LateBoundBitmapDecoder decoder,
DispatcherOperationCallback doc,
object arg
)
{
Dispatcher dispatcher = decoder.Dispatcher;
if (dispatcher != null)
{
dispatcher.BeginInvoke(DispatcherPriority.Normal, doc, arg);
}
else
{
// Decoder seems to be thread free. This is probably bad
Debug.Assert(false);
}
}