图像特效---Wave滤镜

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Wave Filter水波滤镜

水波滤镜是通过坐标变换来模拟水波效果，使图像呈现出水波的特效。这个滤镜有一个可调参数：水波的扭曲程度。

代码如下;

///

/// Wave Filter

///

/// Source image.

/// The degree of wave,0-100.

/// The result image.

private Bitmap WaveFilterProcess(Bitmap srcBitmap, int degree)

{

Bitmap a = new Bitmap(srcBitmap);

int w = a.Width;

int h = a.Height;

degree = degree * 32 / 100;

degree = Math.Max(0, Math.Min(32, degree));

Bitmap dst = new Bitmap(w, h);

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

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

unsafe

{

byte* pIn = (byte*)srcData.Scan0.ToPointer();

byte* pOut = (byte*)dstData.Scan0.ToPointer();

byte* p = null;

int stride = srcData.Stride - w * 4;

int newX = 0, newY = 0;

double PI2 = Math.PI * 2.0;

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

{

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

{

newX = (int)(degree * Math.Sin(PI2 * y / 128.0)) + x;

newY = (int)(degree * Math.Cos(PI2 * x / 128.0)) + y;

newX = Math.Min(w - 1, Math.Max(0, newX));

newY = Math.Min(h - 1, Math.Max(0, newY));

p = pIn + newY * srcData.Stride + newX * 4;

pOut[0] = (byte)p[0];

pOut[1] = (byte)p[1];

pOut[2] = (byte)p[2];

pOut[3] = (byte)255;

pOut += 4;

}

pOut += stride;

}

a.UnlockBits(srcData);

dst.UnlockBits(dstData);

}

return dst;

}

效果图如下：

原图

水波滤镜效果图

demo ：点击打开链接

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