internal unsafe void WriteArray <T>(long position, T[] buffer, int index, int count)
where T : struct
{
uint elementSize = (uint)Marshal.SizeOf(typeof(T));
if (position > this._view.Size - (elementSize * count))
{
throw new ArgumentOutOfRangeException("position");
}
try
{
byte *ptr = null;
_view.SafeMemoryMappedViewHandle.AcquirePointer(ref ptr);
ptr += _view.ViewStartOffset + position;
FastStructure.WriteArray <T>((IntPtr)ptr, buffer, index, count);
//for (var i = 0; i < count; i++)
//{
// StructureToPtr(ref buffer[index + i], ptr + (i * elementSize));
//}
}
finally
{
_view.SafeMemoryMappedViewHandle.ReleasePointer();
}
}
/// <summary>
/// Queue an outbound message containing one or more <typeparamref name="T"/> values.
///
/// <para>
/// If we cannot fit the entire dataset into a single message, and
/// <paramref name="allowSplitMessages"/> is true then the payload will
/// be split into multiple messages, each with a distinct
/// <see cref="InteropMessageHeader.index"/> and <see cref="InteropMessageHeader.count"/>
/// range.
/// </para>
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="type"></param>
/// <param name="target"></param>
/// <param name="data"></param>
/// <param name="allowSplitMessages"></param>
public bool ReplaceOrQueueArray <T>(RpcRequest type, string target, T[] data, bool allowSplitMessages) where T : struct
{
var headerSize = FastStructure.SizeOf <InteropMessageHeader>();
var elementSize = FastStructure.SizeOf <T>();
// TODO: Splitting. Right now assume fit or fail.
if (headerSize + elementSize * data.Length > messageProducer.NodeBufferSize)
{
throw new Exception($"Cannot queue {data.Length} elements of {typeof(T)} - will not fit in a single message");
}
var header = new InteropMessageHeader {
type = type,
index = 0,
count = data.Length
};
// TODO: If the source array size changes - find queued won't be correct.
// We assume ReplaceOrQueue because of the below TODO - multiple queued arrays
// would be pointing to the same data anyway.
// If it's already queued, we don't need to do anything.
var queued = FindQueuedMessage(target, ref header);
if (queued != null)
{
return(true);
}
outboundQueue.Enqueue(new InteropMessage
{
target = target,
header = header,
producer = (tar, hdr, ptr) => {
if (hdr.count < 1 || hdr.index + hdr.count > data.Length)
{
throw new Exception($"Producer out of range of dataset - {hdr.type} - {tar}");
}
// TODO: My concern here would be what happens if the buffer changes before this is sent?
// This would send the updated buffer - BUT that probably wouldn't be a problem because
// we're trying to send the most recent data at all times anyway, right?
// Even if it's sitting in queue for a while.
// Also seems like this should be an implicit QueueOrReplace - because if multiple
// queued messsages point to the same array - they're going to send the same array data.
// Could leave this up to the QueueArray caller - passing in this Func<...>
// and we're just responsible for adjusting the header to the ranges that fit.
FastStructure.WriteArray(ptr, data, hdr.index, hdr.count);
return(elementSize * hdr.count);
}
});
return(false);
}
protected void ProcessFrame(int width, int height, int pitch, PixelFormat format, IntPtr pBits)
{
if (format == PixelFormat.Undefined)
{
DebugMessage("Unsupported render target format");
return;
}
if (pBits == IntPtr.Zero)
{
DebugMessage("No image data");
return;
}
// Copy the image data from the buffer
int size = height * pitch;
var data = new byte[size];
try
{
try
{
Marshal.Copy(pBits, data, 0, size);
producer.Write(intPtr =>
{
MetaDataStruct metaData = new MetaDataStruct(data.Length, width, height, pitch, format);
FastStructure.StructureToPtr(ref metaData, intPtr);
intPtr += FastStructure <MetaDataStruct> .Size;
FastStructure.WriteArray <byte>(intPtr, data, 0, data.Length);
return(0);
}, 0); // skip frame if we cannot write to circular buffer immediately
}
catch (TimeoutException)
{
// If we could not acquire write lock skip frame
}
catch (AccessViolationException)
{
// In this specifc case we are ignoring CSE (corrupted state exception)
// It could happen during Window resizing.
// If someone knows are better way please feel free to contribute
// Because there is a timout in the resizing hook this exception should never be thrown
}
}
catch (ObjectDisposedException)
{
// swallow exception to not crash hooked process
}
}
/// <summary>
/// Copy a subset of this buffer to the given memory address.
///
/// The current <see cref="Offset"/> will be applied during copy.
/// </summary>
/// <param name="ptr">The destination memory location</param>
/// <param name="index">The start index within this buffer</param>
/// <param name="count">The number of elements to write</param>
public void CopyTo(IntPtr dst, int index, int count)
{
FastStructure.WriteArray(dst, data, Offset + index, count);
}
