马赛克算法

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public static Bitmap KiMosaic(Bitmap b, int val)        {            if (b.Equals(null)) { return null; }            int w = b.Width;             int h = b.Height;            int stdR, stdG, stdB;            stdR = 0; stdG = 0; stdB = 0;            BitmapData srcData = b.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);            unsafe            {                byte* p = (byte*)srcData.Scan0.ToPointer();                for (int y = 0; y < h; y++)                {                    for (int x = 0; x < w; x++)                    {                        if (y % val == 0)                        {                            if (x % val == 0) { stdR = p[2]; stdG = p[1]; stdB = p[0]; }                            else { p[0] = (byte)stdB; p[1] = (byte)stdG; p[2] = (byte)stdR; }                        }                        else                        {                              byte* pTemp = p - srcData.Stride;                            p[0] = (byte)pTemp[0];                             p[1] = (byte)pTemp[1];                            p[2] = (byte)pTemp[2];                        } p += 3;                    }                    p += srcData.Stride - w * 3;                }                b.UnlockBits(srcData);            }            return b;        }
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