C# - Imaging - XYMosaic (XY马赛克)

写此段代码的原因是为了证明坎子的程序的可优化性，随写此代码~~~当然，上班时间偷闲的匆匆之作，我的代码依然可优化~~~比如用填充的方法填充一个单一颜色的位图，然后排布这个位图，来做马赛克效果~~~
谁有心思，写一个吧~~
^_^
坎子的代码：http://www.cnblogs.com/iceshark/archive/2004/12/12/75362.html
更新了一下，去掉了BUG一处~~

        XYMosaic( Bitmap ObjectBitmap , uint Stride )#region XYMosaic( Bitmap ObjectBitmap , uint Stride )

        public static void XYMosaic(Bitmap ObjectBitmap, uint Stride) 
        { 
            if(ObjectBitmap.Equals(null)) 
            { 
                new Exception("The Bitmap is null."); 
            } 
            try 
            { 
                int stride = (int)Stride; 
                int centerW = (stride - 1) / 2;;
                int centerH = centerW;
                int newH = ObjectBitmap.Height / stride + 1; 
                int newW = ObjectBitmap.Width / stride + 1; 
                int tmpH, tmpW;
                int lW = ObjectBitmap.Width % stride;
                int lH = ObjectBitmap.Height % stride;
                int ti, tj;
                Color c; 
                for(int w = 0; w < newW; w++) 
                { 
                    tmpW = w * stride; 
                    if(w.Equals(newW - 1))
                    {
                        ti = lW;
                    }
                    else
                    {
                        ti = stride;
                    }
                    centerW = (ti - 1) / 2; 
                    for(int h = 0; h < newH; h++) 
                    { 
                        tmpH = h * stride;                    
                        if(h.Equals(newH - 1))
                        {
                            tj = lH;
                        }
                        else
                        {
                            tj = stride;
                        }
                        centerH = (tj - 1) / 2; 
                        c = ObjectBitmap.GetPixel(tmpW + centerW, tmpH + centerH); 
                        for(int i = 0; i < ti; i++) 
                        { 
                            for(int j = 0; j < tj; j++) 
                            { 
                                ObjectBitmap.SetPixel(tmpW + i, tmpH + j, c); 
                            } 
                        }
                    }
                } 
            } 
            catch(Exception e) 
            { 
                new Exception("Mosaic Error", e); 
            } 
        }

        #endregion