/// <summary>
/// Read back the data from the texture into a CPU buffer
/// </summary>
/// <param name="buffer"></param>
public void ReadBack(byte[] buffer)
{
Stopwatch Timer = new Stopwatch();
Timer.Start();
try
{
FDevice.StretchRectangle(this.FTextureShared.GetSurfaceLevel(0), this.FTextureCopied.GetSurfaceLevel(0), TextureFilter.None);
FDevice.GetRenderTargetData(this.FTextureCopied.GetSurfaceLevel(0), FSurfaceOffscreen);
var rect = FSurfaceOffscreen.LockRectangle(LockFlags.ReadOnly);
try
{
rect.Data.Read(buffer, 0, buffer.Length);
FSurfaceOffscreen.UnlockRectangle();
}
catch (Exception e)
{
FSurfaceOffscreen.UnlockRectangle();
throw;
}
}
catch (Exception e)
{
FDevice.EndScene();
throw;
}
Timer.Stop();
Debug.Print(Timer.Elapsed.TotalMilliseconds.ToString());
}
/// <summary>
/// Gets the specified region (identified in client coordinates) from the current surface
/// </summary>
/// <param name="region">The region (in client coordinates, e.g. <see cref="NativeMethods.GetClientRect"/> is the entire window content).</param>
/// <returns>A new Bitmap object (must be Disposed by caller)</returns>
public Bitmap GetSurfaceRegion(Rectangle region)
{
if (_captureHwnd == IntPtr.Zero)
{
return(null);
}
#region Create a copy of the surface image
NativeMethods.UpdateWindowShared(_captureHwnd, 0, 0, 0, IntPtr.Zero, IntPtr.Zero);
Surface.FromSurface(_renderTarget, _sharedSurface, Filter.None, 0);
_deviceEx.GetRenderTargetData(_renderTarget, _systemMemorySurface);
#endregion
#region Put the data into a Bitmap
// Note: during my tests I found that the captured area includes space for the window chrome
// but filled in black.
// Take into consideration the window chrome
Size chrome = NativeMethods.GetWindowChromeSize(_captureHwnd);
region.X += chrome.Width;
region.Y += chrome.Height;
// We need to convert Width and Height to x2, and y2 respectively, because
// Surface.ToStream(...) expects the rectangle to have x1,y1,x2,y2 not x1,y1,width,height
// (SlimDX version 2.0.6.40)
region.Width += region.X;
region.Height += region.Y;
DataStream stream = Surface.ToStream(_systemMemorySurface, ImageFileFormat.Bmp, region);
Bitmap surfaceBitmap = (Bitmap)Image.FromStream(stream);
stream.Close();
stream.Dispose();
#endregion
return(surfaceBitmap);
}
