public byte[] ExtractRawBitmap()
{
// use a cpu bound resource
var textureDesc = new Texture2DDescription
{
MipLevels = 1,
ArraySize = 1,
BindFlags = BindFlags.None,
CpuAccessFlags = CpuAccessFlags.Read,
Format = Format.B8G8R8A8_UNorm,
OptionFlags = ResourceOptionFlags.None,
Width = _width,
Height = _height,
Usage = ResourceUsage.Staging,
SampleDescription = new SampleDescription(1, 0)
};
using (var cpuTexture = new Texture2D(_device, textureDesc))
{
#if NETFX_CORE
_device.ImmediateContext.CopyResource(_texture, cpuTexture);
#else
_device.CopyResource(_texture, cpuTexture);
#endif
var bytesPerLine = _width * 4;
var res = new byte[bytesPerLine * _height];
#if NETFX_CORE
var data = _device.ImmediateContext.MapSubresource(cpuTexture, 0, MapMode.Read, MapFlags.None);
#else
var data = cpuTexture.Map(0, MapMode.Read, MapFlags.None);
#endif
try
{
IntPtr sourcePtr = data.DataPointer;
int targetOffset = 0;
for (int i = 0; i != _height; ++i)
{
Marshal.Copy(sourcePtr, res, targetOffset, bytesPerLine);
#if NETFX_CORE
sourcePtr += data.RowPitch;
#else
sourcePtr += data.Pitch;
#endif
targetOffset += bytesPerLine;
}
return(res);
}
finally
{
#if NETFX_CORE
_device.ImmediateContext.UnmapSubresource(cpuTexture, 0);
#else
cpuTexture.Unmap(0);
#endif
}
}
}
