AbstractReader.AbstractReader.GetMatchingUnprocessedDirectNeighbors C# (CSharp) Method

        private IEnumerable<Point> GetMatchingUnprocessedDirectNeighbors(int x, int y)
        {
            var directNeighbors = new List<Point>();
            // top
            int newX = x;
            int newY = y - 1;
            if (newY > 0 && !this._colorsProcessed[newX, newY] && this._colors[x, y] == this._colors[newX, newY])
            {
                directNeighbors.Add(new Point { X = newX, Y = newY });
            }
            // right
            newX = x + 1;
            newY = y;
            if (newX < this._bitmapWidth && !this._colorsProcessed[newX, newY] && this._colors[x, y] == this._colors[newX, newY])
            {
                directNeighbors.Add(new Point { X = newX, Y = newY });
            }
            // bottom
            newX = x;
            newY = y + 1;
            if (newY < this._bitmapHeight && !this._colorsProcessed[newX, newY] && this._colors[x, y] == this._colors[newX, newY])
            {
                directNeighbors.Add(new Point { X = newX, Y = newY });
            }
            // left
            newX = x - 1;
            newY = y;
            if (newX > 0 && !this._colorsProcessed[newX, newY] && this._colors[x, y] == this._colors[newX, newY])
            {
                directNeighbors.Add(new Point { X = newX, Y = newY });
            }
            return directNeighbors;
        }