C# Bitmap 复制的小例子

    if (depth != 8 && depth != 24 && depth != 32)
    {
        return null;
    }

    Bitmap destination = new Bitmap(source.Width, source.Height, source.PixelFormat);

    BitmapData source_bitmapdata = null;
    BitmapData destination_bitmapdata = null;

    try
    {
        source_bitmapdata = source.LockBits(new Rectangle(0, 0, source.Width, source.Height), ImageLockMode.ReadWrite,
                                        source.PixelFormat);
        destination_bitmapdata = destination.LockBits(new Rectangle(0, 0, destination.Width, destination.Height), ImageLockMode.ReadWrite,
                                        destination.PixelFormat);

        unsafe
        {
            byte* source_ptr = (byte*)source_bitmapdata.Scan0;
            byte* destination_ptr = (byte*)destination_bitmapdata.Scan0;

            for (int i = 0; i < (source.Width * source.Height * (depth / 8)); i++)
            {
                *destination_ptr = *source_ptr;
                source_ptr++;
                destination_ptr++;
            }
        }

        source.UnlockBits(source_bitmapdata);
        destination.UnlockBits(destination_bitmapdata);

        return destination;
    }
    catch
    {
        destination.Dispose();
        return null;
    }
}