C# 图像旋转 90度

byte[] rgb24_Rotate(byte[] buff, int width, int height)
        {
            byte[] tmpBuff = new byte[buff.Length];
            int n = 0;
            int linesize = width * 3;

            // 顺时针的旋转90度的算法 
            for (int j = 0; j < width; j++)
                for (int i = height - 1; i >= 0; i--)
                {
                    long xx = linesize * i + j * 3;
                    tmpBuff[n] = buff[xx + 0];
                    tmpBuff[n + 1] = buff[xx + 1];
                    tmpBuff[n + 2] = buff[xx + 2];
                    n += 3;
                }

            /*// 逆时针的旋转90度的算法 
            //for (int j = width - 1; j >= 0; j--)
            //    for (int i = 0; i < height; i++)
            //    {
            //        long xx = linesize * i + j * 3;
            //        tmpBuff[n] = buff[xx];
            //        tmpBuff[n+1] = buff[xx+1];
            //        tmpBuff[n+2] = buff[xx+2];
            //        n += 3;
            //    }            
            */
            
            return tmpBuff;