C# if（*（A）==B） 看代码时卡住了这部分

请问大神们这个指针是什么意思啊？ 怎么解析啊？指针的内容也不是很懂
static private unsafe PROCESS MakeLine(ref SortedDictionary dicLabelInfo, ref int[,] arriLabel, Bitmap bmpSrc, Bitmap bmpRoi)//MGWork
{
BitmapData bmpdSrc = null, bmpdRoi = null;
byte* pbtSrc = null, pbtRoi = null;
int iLabelVal = 0;
int iLineNum = 0, iGroundNum = 0;
int iRow, iCol, iWidth, iHeight;
PROCESS enRes = PROCESS.FAILED;
int iChannelCnt = 0;

        try
        {
            if (bmpSrc == null || bmpSrc.PixelFormat != PixelFormat.Format8bppIndexed)
                throw new Exception("Invalid parameter.");

            if (arriLabel == null)
                arriLabel = new int[bmpSrc.Height, bmpSrc.Width];
            if (dicLabelInfo != null)
                dicLabelInfo.Clear();
            dicLabelInfo = new SortedDictionary<int, FanoutDefect>();
            iHeight = arriLabel.GetLength(0);
            iWidth = arriLabel.GetLength(1);
            iChannelCnt = _commonImgLib.GetChannelCount(bmpRoi.PixelFormat);
            if (iChannelCnt == -1)
                throw new Exception("Cannot get count of channels.");

            bmpdSrc = bmpSrc.LockBits(new Rectangle(0, 0, bmpSrc.Width, bmpSrc.Height), ImageLockMode.ReadOnly, bmpSrc.PixelFormat);
            bmpdRoi = bmpRoi.LockBits(new Rectangle(0, 0, bmpRoi.Width, bmpRoi.Height), ImageLockMode.ReadOnly, bmpRoi.PixelFormat);
            pbtSrc = (byte*)bmpdSrc.Scan0.ToPointer();
            pbtRoi = (byte*)bmpdRoi.Scan0.ToPointer();

            for (iRow = 0; iRow < iHeight; iRow++)
            {
                for (iCol = 0; iCol < iWidth; iCol++)
                {
                    if (*(pbtRoi + iRow * bmpdRoi.Stride + iCol * iChannelCnt) != 0)
                    {
                        iLabelVal = arriLabel[iRow, iCol];
                        if (iLabelVal == 0)
                        {
                            enRes = FOLabeller.LabelOne(ref dicLabelInfo, ref iLineNum, ref iGroundNum, ref arriLabel, pbtSrc, bmpdSrc, iRow, iCol);
                            if (enRes != PROCESS.SUCCESS)
                                throw new Exception("Labelling is failed.");
                        }
                    }
                }
            }

            return PROCESS.SUCCESS;
        }
        finally
        {
            if (bmpdSrc != null) bmpSrc.UnlockBits(bmpdSrc);
        }
    }

这段代码中，A是一个指针，* 是取值运算符，表示从A指针指向的地址中获得存储的值，if（*（A）==B）表示判断 A指针指向的地址中存储的值是不是等于B

C#一般很少用指针。你最好把上下文代码都贴出来看看。