private PinnedBuffer CheckOutBuffer(long size)
{
var buffer = FirstAvailableBuffer(size);
if (buffer == null)
{
buffer = new PinnedBuffer(size);
_buffers.Add(buffer);
}
buffer.Reserve(); //todo: improve encapsulation here
Log.Debug(Name + " Buffer of size " + size +
" checked out - there are now " + Count(b => b.Length == size) +
" buffers of that size, " + Count(b => b.Length == size && b.Available) + " available.");
return(buffer);
}
/// <summary>
/// Finds the first available buffer or returns null. Calls to linq
/// like FirstOrDefault are not thread safe and blow up if the underlying
/// iterator changes.
/// </summary>
private PinnedBuffer FirstAvailableBuffer(long size)
{
PinnedBuffer buffer = null;
// This implementation assumes that we add to _buffers, but don't remove
for (int i = 0; i < _buffers.Count; i++)
{
var b = _buffers[i];
if (b != null && b.Length == size && b.Available)
{
buffer = b;
break;
}
}
return(buffer);
}
public unsafe WrappedSquareImage(BufferManager manager, PinnedBuffer buffer, int dimension, int bytesPerPixel) :
base(manager, buffer)
{
switch (dimension)
{
case 128:
InnerImage = new TwoByte128X128Image(buffer.Buffer);
break;
case 256:
InnerImage = new TwoByte256X256Image(buffer.Buffer);
break;
case 512:
InnerImage = new TwoByte512X512Image(buffer.Buffer);
break;
case 1024:
{
if (bytesPerPixel == 2)
{
InnerImage = new TwoByte1024X1024Image(buffer.Buffer);
}
else if (bytesPerPixel == 3)
{
InnerImage = new ThreeByte1024X1024Image(buffer.Buffer);
}
else
{
throw new Exception($"Invalid bytes per pixel requested for new WrappedSquareImage: {bytesPerPixel}");
}
break;
}
default:
throw new Exception($"Invalid image size requested for new WrappedSquareImage: {dimension}");
}
ImagePixelHeight = dimension;
ImagePixelWidth = dimension;
BytesPerPixel = bytesPerPixel;
}
public WrappedBuffer(BufferManager manager, PinnedBuffer buffer)
{
_manager = manager;
_buffer = buffer;
}
internal void Return(PinnedBuffer buffer)
{
buffer.Release(); //todo: improve encapsulation here
Log.Debug(Name + " Buffer returned.");
}
public unsafe WrappedImage(BufferManager manager, PinnedBuffer buffer) :
base(manager, buffer)
{
Frame = new T();
Frame.SetBuffer(buffer.Buffer, (int)buffer.Length);
}