ARCed.Scintilla.Annotation.GetStyles C# (CSharp) Method

        public virtual IEnumerable<StyleRun> GetStyles()
        {
            this.CheckInvalid();

            // We need to translate the array Scintilla gives us representing the style of each text
            // byte into a list of style runs. Our run lengths, however, are measured in characters,
            // not bytes, so we need to also read the annotation text and adjust as necessary when we find
            // characters that span more than one byte.

            int length = this._scintilla.DirectMessage(NativeMethods.SCI_ANNOTATIONGETTEXT, new IntPtr(this._lineIndex), IntPtr.Zero).ToInt32();
            var textBuffer = new byte[length];
            var stylesBuffer = new byte[length];

            unsafe
            {
                fixed (byte* bp = textBuffer)
                    this._scintilla.DirectMessage(NativeMethods.SCI_ANNOTATIONGETTEXT, new IntPtr(this._lineIndex), new IntPtr(bp)).ToInt32();
                fixed (byte* bp = stylesBuffer)
                    this._scintilla.DirectMessage(NativeMethods.SCI_ANNOTATIONGETSTYLES, new IntPtr(this._lineIndex), new IntPtr(bp)).ToInt32();
            }

            var styles = new List<StyleRun>();
            Decoder decoder = this._scintilla.Encoding.GetDecoder();
            var sr = new StyleRun { Style = -1 };
            int index = 0;
            int count = 1;

            while (index < stylesBuffer.Length)
            {
                if (sr.Style != stylesBuffer[index])
                {
                    // A new style has been encountered. Save the last one
                    // to the list we're building and start tracking a new one
                    if (sr.Length > 0)
                        styles.Add(sr);

                    sr = new StyleRun
                    {
                        Style = stylesBuffer[index]
                    };
                }

                // At the end of this loop, the 'count' variable will tell us
                // how many bytes there are for one character.
                while (decoder.GetCharCount(textBuffer, index, count) != 1)
                    count++;

                sr.Length++;
                index += count;
                count = 1;
            }

            // Add the last style run
            styles.Add(sr);

            return styles.ToArray();
        }