public override PixelBuffer ReadPixels(PixelFormat format, Rectangle rect)
{
Direct3D.Surface surf = mTexture.Value.GetSurfaceLevel(0);
bool disposeSurfWhenDone = false;
if (surf.Description.Pool == Pool.Default)
{
surf = CopyRenderTargetSurfaceToSysmem(surf);
disposeSurfWhenDone = true;
}
rect.X += mSrcRect.X;
rect.Y += mSrcRect.Y;
int pixelPitch = mDisplay.GetPixelPitch(surf.Description.Format);
PixelFormat pixelFormat = mDisplay.GetPixelFormat(surf.Description.Format);
if (format == PixelFormat.Any)
{
format = pixelFormat;
}
DataRectangle stm = surf.LockRectangle(
new Drawing.Rectangle(0, 0, mTextureSize.Width, mTextureSize.Height),
LockFlags.ReadOnly);
byte[] array = new byte[SurfaceWidth * SurfaceHeight * pixelPitch];
int length = SurfaceWidth * pixelPitch;
int index = 0;
unsafe
{
byte *ptr = (byte *)stm.Data.DataPointer;
for (int i = rect.Top; i < rect.Bottom; i++)
{
// hack if the size requested is too large.
if (i >= mTextureSize.Height)
{
break;
}
//IntPtr ptr = (IntPtr)((int)stm.InternalData + i * stride + rect.Left * pixelPitch);
IntPtr mptr = (IntPtr)(ptr + i * stm.Pitch + rect.Left * pixelPitch);
Marshal.Copy(mptr, array, index, length);
index += length;
}
}
surf.UnlockRectangle();
if (disposeSurfWhenDone)
{
surf.Dispose();
}
return(new PixelBuffer(format, rect.Size, array, pixelFormat));
}
