protected unsafe WriteableBitmap DecodeData(byte *codecBuffer, uint length, Dispatcher dispatcher, IEnumerable <IWriteableBitmapModifierTask> modifierTasks)
{
if (length < 20)
{
return(_decodedBitmap);
}
var modifyingTasks = modifierTasks?.ToArray();
if (modifyingTasks?.Length == 0)
{
modifyingTasks = null;
}
ImageMetadata metadata;
PixelFormat pixelFormat;
int width;
int height;
var position = RemoteDesktopDataInfo.ReadHeader(codecBuffer, out metadata, out pixelFormat, out width, out height);
var pixelSize = GetPixelSize(pixelFormat);
IntPtr backBuffer = IntPtr.Zero;
int backBufferStride = 0;
if (_decodedBitmap == null)
{
dispatcher.BeginInvoke(DispatcherPriority.Render, new Action(() =>
{
_decodedBitmap = new WriteableBitmap(width, height, 96, 96, PixelFormats.Bgr32, null);
_decodedBitmap.Lock();
backBuffer = _decodedBitmap.BackBuffer;
backBufferStride = _decodedBitmap.BackBufferStride;
})).Wait();
}
else
dispatcher.BeginInvoke(DispatcherPriority.Render, new Action(() =>
{
_decodedBitmap.Lock();
backBuffer = _decodedBitmap.BackBuffer;
backBufferStride = _decodedBitmap.BackBufferStride;
})).Wait(); }
protected virtual unsafe RemoteDesktopDataInfo WriteChanges(Rectangle[] changedAreas, MovedRegion[] movedRegions,
int pixelSize, byte *imageBuffer, PixelFormat pixelFormat, Size imageSize, int imageStride)
{
MemoryStream memoryStream = null;
byte[][] dataArrays = null;
var changedAreasLength = changedAreas?.Length ?? 0;
var movedRegionsLength = movedRegions?.Length ?? 0;
FrameInfo[] frames = null;
if ((ImageCompression.CompressionMode & CompressionMode.Stream) == CompressionMode.Stream)
{
memoryStream = new MemoryStream(_encodeBuffer.Length / 200);
RemoteDesktopDataInfo.WriteHeader(pixelFormat, ImageMetadata.Frames, imageSize.Width, imageSize.Height, memoryStream);
}
else if ((ImageCompression.CompressionMode & CompressionMode.ByteArray) == CompressionMode.ByteArray)
{
dataArrays = new byte[changedAreasLength + movedRegionsLength][];
frames = new FrameInfo[changedAreasLength + movedRegionsLength];
}
else
{
throw new NotSupportedException(ImageCompression.CompressionMode.ToString());
}
if (movedRegions != null)
{
for (int i = 0; i < movedRegions.Length; i++)
{
var movedRegion = movedRegions[i];
if (memoryStream != null)
{
RemoteDesktopDataInfo.WriteFrameInfo(movedRegion.Destination, 8, FrameFlags.MovedRegion, memoryStream);
memoryStream.Write(BitConverter.GetBytes(movedRegion.Source.X), 0, 4);
memoryStream.Write(BitConverter.GetBytes(movedRegion.Source.Y), 0, 4);
}
else
{
var data = new byte[8];
Buffer.BlockCopy(BitConverter.GetBytes(movedRegion.Source.X), 0, data, 0, 4);
Buffer.BlockCopy(BitConverter.GetBytes(movedRegion.Source.Y), 0, data, 4, 4);
dataArrays[i] = data;
frames[i] = new FrameInfo(movedRegion.Destination, FrameFlags.MovedRegion);
}
}
}
if (changedAreas != null)
{
for (int i = 0; i < changedAreas.Length; i++)
{
var blockArea = changedAreas[i];
var blockStride = blockArea.Width * pixelSize;
var blockPointer = Marshal.AllocHGlobal(blockStride * blockArea.Height);
try
{
//build bitmap in memory
for (int j = 0, offset = 0; j < blockArea.Height; j++)
{
int blockOffset = imageStride * (blockArea.Y + j) + pixelSize * blockArea.X;
CoreMemoryApi.memcpy(blockPointer.Add(offset), (IntPtr)(imageBuffer + blockOffset),
(UIntPtr)blockStride);
offset += blockStride;
}
if (memoryStream != null)
{
RemoteDesktopDataInfo.WriteFrameInfo(blockArea, 0, FrameFlags.UpdatedRegion, memoryStream);
var framePos = memoryStream.Position;
ImageCompression.Compress(blockPointer, blockStride, blockArea.Size, pixelFormat,
memoryStream);
var currentPos = memoryStream.Position;
memoryStream.Position = framePos - 4;
memoryStream.Write(BitConverter.GetBytes(currentPos - framePos), 0, 4);
memoryStream.Position = currentPos;
}
else
{
dataArrays[i + movedRegionsLength] = ImageCompression.Compress(blockPointer, blockStride,
blockArea.Size, pixelFormat);
frames[i + movedRegionsLength] = new FrameInfo(blockArea, FrameFlags.UpdatedRegion);
}
}
finally
{
Marshal.FreeHGlobal(blockPointer);
}
}
}
if (memoryStream != null)
{
using (memoryStream)
return(new RemoteDesktopDataInfo(memoryStream.ToArray()));
}
return(new RemoteDesktopDataInfo(dataArrays, frames,
new HeaderInfo(ImageMetadata.Frames, pixelFormat, imageSize.Width, imageSize.Height)));
}