/// <summary>
/// Initializes the texture image.
/// </summary>
/// <param name="image">The texture image.</param>
/// <param name="bitmap">The source bitmap.</param>
/// <param name="x">The tile X coordinate.</param>
/// <param name="y">The tile Y coordinate.</param>
/// <param name="size">The tile size.</param>
private void Initialize(TextureImage image, Bitmap bitmap, int x, int y, int size)
{
using (var tile = bitmap.Clone(x * size, y * size, size, size))
{
tile.PinAsReadOnly(data => image.Initialize(size, size, GL.BGRA, data));
}
}