Aries.IconMethods.IcDvImg.setImageBitsFromBitmap C# (CSharp) Метод

        private void setImageBitsFromBitmap(Bitmap bm)
        {
            IntPtr hdc = CreateDC("DISPLAY", IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
            IntPtr ptr2 = CreateCompatibleDC(hdc);
            DeleteDC(hdc);
            IntPtr hbitmap = bm.GetHbitmap();
            BITMAPINFOHEADER bmInfoHeader = new BITMAPINFOHEADER(this.size, this.colorDepth);
            int cb = this.XorImageIndex(bmInfoHeader);
            int num2 = this.XorImageSize(bmInfoHeader);
            IntPtr destination = Marshal.AllocCoTaskMem(cb);
            Marshal.Copy(this.data, 0, destination, cb);
            Marshal.WriteInt32(destination, 8, bmInfoHeader.biHeight / 2);
            IntPtr bits = Marshal.AllocCoTaskMem(num2);
            GetDIBits(ptr2, hbitmap, 0, this.size.Height, bits, destination, 0);
            Marshal.Copy(bits, this.data, cb, num2);
            Marshal.FreeCoTaskMem(bits);
            Marshal.FreeCoTaskMem(destination);
            DeleteObject(hbitmap);
            DeleteDC(ptr2);
            this.createIcon();
        }