public override unsafe Task RenderBorderAsync(VideoFrameRenderer renderer, VideoFrameData frame, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
fixed(void *p = _borderBuffer)
{
renderer.RenderVideoBorder32(frame, (IntPtr)p, 256 * 4);
}
cancellationToken.ThrowIfCancellationRequested();
// Setting up a task completion source may not be needed here, but I don't know if there's something to gain by not doing so.
if (SynchronizationContext != null)
{
var tcs = new TaskCompletionSource <bool>();
SynchronizationContext.Post(UpdateBorderAndPresent, tcs);
return(tcs.Task);
}
else
{
UpdateBorderAndPresent(null);
return(TaskHelper.TrueTask);
}
}
public override Task RenderBorderAsync(VideoFrameRenderer renderer, VideoFrameData frame, CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
return(TaskHelper.CanceledTask);
}
var bitmap = _borderBitmapTripleBufferingSystem.GetCurrentProducerBuffer();
// Calls to GDI+ should be thread-safe for the most part, so we only have to take a little bit of care for ensuring correctness.
bitmap.LockBits(_borderRectangle, ImageLockMode.WriteOnly, PixelFormat.Format32bppPArgb, _lockedBorderBitmapData);
renderer.RenderVideoBorder32(frame, _lockedBorderBitmapData.Scan0, _lockedBorderBitmapData.Stride);
bitmap.UnlockBits(_lockedBorderBitmapData);
_borderBitmapTripleBufferingSystem.GetNextProducerBuffer();
if (cancellationToken.IsCancellationRequested)
{
return(TaskHelper.CanceledTask);
}
// Setting up a task completion source may not be needed here, but I don't know if there's something to gain by not doing so.
if (SynchronizationContext != null)
{
var tcs = new TaskCompletionSource <bool>();
SynchronizationContext.Post(Render, tcs);
return(tcs.Task);
}
else
{
Render(null);
return(CompletedTask);
}
}