public override PixelBuffer ReadPixels(PixelFormat format, Rectangle rect)
{
if (format == PixelFormat.Any)
{
format = PixelFormat.RGBA8888;
}
rect.X += mSourceRect.X;
rect.Y += mSourceRect.Y;
int pixelStride = 4;
int size = mTextureSize.Width * mTextureSize.Height * pixelStride;
int memStride = pixelStride * mTextureSize.Width;
IntPtr memory = Marshal.AllocHGlobal(size);
GL.BindTexture(TextureTarget.Texture2D, mTextureID);
GL.GetTexImage(TextureTarget.Texture2D, 0, OTKPixelFormat.Rgba,
PixelType.UnsignedByte, memory);
byte[] data = new byte[rect.Width * rect.Height * pixelStride];
unsafe
{
for (int i = rect.Top; i < rect.Bottom; i++)
{
int dataIndex = (i - rect.Top) * pixelStride * rect.Width;
IntPtr memPtr = (IntPtr)((byte *)memory + i * memStride + rect.Left * pixelStride);
Marshal.Copy(memPtr, data, dataIndex, pixelStride * rect.Width);
}
}
Marshal.FreeHGlobal(memory);
if (format == PixelFormat.RGBA8888)
{
return(new PixelBuffer(format, SurfaceSize, data));
}
else
{
return(new PixelBuffer(format, SurfaceSize, data, PixelFormat.RGBA8888));
}
}
public override PixelBuffer ReadPixels(PixelFormat format, Geometry.Rectangle rect)
{
BitmapData data = mImage.LockBits(Interop.Convert(rect), ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
if (format == PixelFormat.Any)
{
format = PixelFormat.BGRA8888;
}
PixelBuffer buffer = new PixelBuffer(format, rect.Size);
byte[] bytes = new byte[4 * rect.Width * rect.Height];
Marshal.Copy(data.Scan0, bytes, 0, bytes.Length);
mImage.UnlockBits(data);
buffer.SetData(bytes, PixelFormat.BGRA8888);
return(buffer);
}
public override PixelBuffer ReadPixels(PixelFormat format)
{
return(ReadPixels(format, new Rectangle(Point.Empty, SurfaceSize)));
}