马赛克效果

/// <summary> /// 马赛克效果 ///原理：确定图像的随机位置点和确定马赛克块的大小,然后马赛克块图像覆盖随机点即可. /// </summary> /// <param name="m_Iimage"></param> /// <param name="val">分割成val*val像素的小区块</param> public Image MaSaiKe(Image m_PreImage , int val) { Bitmap MyBitmap = new Bitmap(m_PreImage); if (MyBitmap.Equals(null)) { return null; } int iWidth = MyBitmap.Width; int iHeight = MyBitmap.Height; int stdR , stdG , stdB; stdR = 0; stdG = 0; stdB = 0; BitmapData srcData = MyBitmap.LockBits(new Rectangle(0 , 0 , iWidth , iHeight) , ImageLockMode.ReadWrite , PixelFormat.Format24bppRgb); unsafe { byte* point = (byte*)srcData.Scan0.ToPointer(); for (int i = 0; i < iHeight; i++) { for (int j = 0; j < iWidth; j++) { if (i % val == 0) { if (j % val == 0) { stdR = point[2]; stdG = point[1]; stdB = point[0]; } else { point[0] = (byte)stdB; point[1] = (byte)stdG; point[2] = (byte)stdR; } } else { //复制上一行 byte* pTemp = point - srcData.Stride; point[0] = (byte)pTemp[0]; point[1] = (byte)pTemp[1]; point[2] = (byte)pTemp[2]; } point += 3; } point += srcData.Stride - iWidth * 3; } MyBitmap.UnlockBits(srcData); } return MyBitmap; }

 

这段代码使用了不安全代码，用了指针，要运行需要更改VS配置

http://topic.csdn.net/u/20110411/12/4a44f138-b8f5-4d72-82eb-6b153eca360e.html?60078