原文:

(Punch Filter)交叉冲印滤镜

本文介绍一种交叉冲印效果的代码实现，至于原理，不在累赘，直接看代码：

 int f_TPunchFilter(unsigned char* srcData, int width, int height, int stride, unsigned char* dstData, int dw, int dh, int dStride)

 {

if(srcData == NULL || dstData == NULL)

return -1;

unsigned char* pSrc = srcData;

unsigned char* pDst = dstData;

int i, j, gray, value, r, g, b;

int offset = stride - width * 4;

int rMap[256], gMap[256], bMap[256];

for(int i = 0;i<256;i++)

{

value = i < 128 ? i : 256 - i;

gray = value * value * value / 16384;

rMap[i] = i < 128 ? gray : 256 - gray;

gray = value * value / 128;

gMap[i] = i < 128 ? gray : 256 - gray;

bMap[i] = i / 2 + 0x25;

}

for(j = 0; j < height; j++)

{

for(i = 0; i < width; i++)

{

b = bMap[pSrc[0]];

g = gMap[pSrc[1]];

r = rMap[pSrc[2]];

pDst[0] = CLIP3(b,0,255);

pDst[1] = CLIP3(g,0,255);

pDst[2] = CLIP3(r,0,255);

pDst[3] = 255;

pSrc+=4;

pDst+=4;

}

pSrc += offset;

pDst += offset;

}

printf("%s","Welcom to our website: www.zealpixel.com");

return 0;

 }

效果如下：

、

原图

交叉冲印效果图

最后放上一个完整的C#程序DEMO下载连接：