图像特效---Oilpaint油画滤镜

Oilpaint油画滤镜
核心代码如下：

///

/// Mosaic filter.

///

/// Source image.

/// The size of mosaic effect.

/// Resullt image.

public Bitmap OilpaintFilter(Bitmap src, int intensity)

{

Bitmap srcBitmap = new Bitmap(src);

int w = srcBitmap.Width;

int h = srcBitmap.Height;

System.Drawing.Imaging.BitmapData srcData = srcBitmap.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

IntPtr ptr = srcData.Scan0;

int bytes = h * srcData.Stride;

byte[] srcValues = new byte[bytes];

System.Runtime.InteropServices.Marshal.Copy(ptr, srcValues, 0, bytes);

byte[] tempValues = (byte[])srcValues.Clone();

int stride = srcData.Stride;

Random ran = new Random();

int k = 0;

int dx = 0;

int dy = 0;

for (int j = 0; j < h; j++)

{

for (int i = 0; i < w; i++)

{

k = ran.Next(intensity);

dx = (i + k) >= w ? w - 1 : (i + k);

dy = (j + k) >= h ? h - 1 : (j + k);

tempValues[i * 4 + j * w * 4] = (byte)srcValues[dx * 4 + dy * w * 4];

tempValues[i * 4 + 1 + j * w * 4] = (byte)srcValues[dx * 4 + 1 + dy * w * 4];

tempValues[i * 4 + 2 + j * w * 4] = (byte)srcValues[dx * 4 + 2 + dy * w * 4];

}

}

srcValues = (byte[])tempValues.Clone();

System.Runtime.InteropServices.Marshal.Copy(srcValues, 0, ptr, bytes);

srcBitmap.UnlockBits(srcData);

return srcBitmap;

}

程序demo： http://www.zealfilter.com/forum.php?mod=viewthread&tid=52&extra=page%3D2