MSIT.NGif.GifEncoder.WriteImageDesc C# (CSharp) Method

        private void WriteImageDesc()
        {
            _fs.WriteByte(0x2c); // image separator
            WriteShort(0); // image position x,y = 0,0
            WriteShort(0);
            WriteShort(_width); // image size
            WriteShort(_height);
            // packed fields
            if (_firstFrame)
                // no LCT  - GCT is used for first (or only) frame
                _fs.WriteByte(0);
            else
                // specify normal LCT
                _fs.WriteByte(Convert.ToByte(0x80 | // 1 local color table  1=yes
                                            0 | // 2 interlace - 0=no
                                            0 | // 3 sorted - 0=no
                                            0 | // 4-5 reserved
                                            _palSize)); // 6-8 size of color table
        }