Yunan.WPF.ImageAnim.GifAnimation.ParseLogicalScreen C# (CSharp) Method

        private int ParseLogicalScreen(byte[] gifData, int offset)
        {
            _logicalWidth = BitConverter.ToUInt16(gifData, offset);
            _logicalHeight = BitConverter.ToUInt16(gifData, offset + 2);

            byte packedField = gifData[offset + 4];
            bool hasGlobalColorTable = (int)(packedField & 0x80) > 0 ? true : false;

            int currentIndex = offset + 7;
            if (hasGlobalColorTable)
            {
                int colorTableLength = packedField & 0x07;
                colorTableLength = (int)Math.Pow(2, colorTableLength + 1) * 3;
                currentIndex = currentIndex + colorTableLength;
            }
            return currentIndex;
        }