private byte[] DecodeBC4()
 {
     var buff = new byte[m_Width * m_Height * 4];
     if (!TextureDecoder.DecodeBC4(image_data, m_Width, m_Height, buff))
     {
         return null;
     }
     return buff;
 }
 private bool DecodeBC4(byte[] image_data, byte[] buff)
 {
     return(TextureDecoder.DecodeBC4(image_data, m_Width, m_Height, buff));
 }