求人翻译一段源码

Death·hacker · 发表于 2012-12-30 16:22:15

终于可以睡觉鸟啊，写一个函数写了那么久，55555
编程真的不好受啊，特意帖出来作为留念，oh yeah
^_^，这个也是【原创】的，发在这里合适吧

BOOL WINAPI EdgeDIB(LPSTR lpDIBBits, LONG lWidth, LONG lHeight)
{
// 指向源图像的指针
LPSTR lpSrc;

// 指向缓存图像的指针
LPSTR lpDst;

// 指向缓存DIB图像的指针
LPSTR lpNewDIBBits;
HLOCAL hNewDIBBits;
//循环变量
long i;
long j;
unsigned char n,e,s,w,ne,se,nw,sw;
//像素值
unsigned char pixel;
// 图像每行的字节数
LONG lLineBytes;
// 计算图像每行的字节数
lLineBytes = WIDTHBYTES(lWidth * 8);

//==================================对图像进行轮廓提取================================
// 暂时分配内存，以保存新图像
hNewDIBBits = LocalAlloc(LHND, lLineBytes * lHeight);
if (hNewDIBBits == NULL)
{
  // 分配内存失败
  return FALSE;
}

// 锁定内存
lpNewDIBBits = (char * )LocalLock(hNewDIBBits);
// 初始化新分配的内存，设定初始值为255
lpDst = (char *)lpNewDIBBits;
memset(lpDst, (BYTE)255, lLineBytes * lHeight);
for(j = 1; j <lHeight-1; j++)
{
  for(i = 1;i <lLineBytes-1; i++)
  {

// 指向源图像倒数第j行，第i个象素的指针
lpSrc = (char *)lpDIBBits + lLineBytes * j + i;

// 指向目标图像倒数第j行，第i个象素的指针
lpDst = (char *)lpNewDIBBits + lLineBytes * j + i;

//取得当前指针处的像素值，注意要转换为unsigned char型
pixel = (unsigned char)*lpSrc;
//目标图像中非白的像素值全部变成黑色
if(pixel != 255)
*lpSrc = (unsigned char)0;

  }
}

for(j = 1; j <lHeight-1; j++)
{
  for(i = 1;i <lLineBytes-1; i++)
  {

// 指向源图像倒数第j行，第i个象素的指针
lpSrc = (char *)lpDIBBits + lLineBytes * j + i;

// 指向目标图像倒数第j行，第i个象素的指针
lpDst = (char *)lpNewDIBBits + lLineBytes * j + i;

//取得当前指针处的像素值，注意要转换为unsigned char型
pixel = (unsigned char)*lpSrc;

if(pixel == 0)
{
*lpDst = (unsigned char)0;
nw = (unsigned char)*(lpSrc + lLineBytes -1);
n  = (unsigned char)*(lpSrc + lLineBytes );
ne = (unsigned char)*(lpSrc + lLineBytes +1);
w = (unsigned char)*(lpSrc -1);
e = (unsigned char)*(lpSrc +1);
sw = (unsigned char)*(lpSrc - lLineBytes -1);
s  = (unsigned char)*(lpSrc - lLineBytes );
se = (unsigned char)*(lpSrc - lLineBytes +1);
//如果相邻的八个点都是黑点
if(nw+n+ne+w+e+sw+s+se==0)
{
   *lpDst = (unsigned char)255;
}
}
  }
}
// 复制腐蚀后的图像
memcpy(lpDIBBits, lpNewDIBBits, lLineBytes * lHeight);
// 释放内存
LocalUnlock(hNewDIBBits);
LocalFree(hNewDIBBits);

//==================================对图像进行轮廓跟踪================================

      //是否找到起始点及回到起始点
bool bFindStartPoint;
//是否扫描到一个边界点
bool bFindPoint;
//起始边界点与当前边界点
Point StartPoint,CurrentPoint;
//八个方向和起始扫描方向
int Direction[8][2]={{-1,1},{0,1},{1,1},{1,0},{1,-1},{0,-1},{-1,-1},{-1,0}};
int BeginDirect;
// 暂时分配内存，以保存新图像
hNewDIBBits = LocalAlloc(LHND, lLineBytes * lHeight);
if (hNewDIBBits == NULL)
{
  // 分配内存失败
  return FALSE;
}

// 锁定内存
lpNewDIBBits = (char * )LocalLock(hNewDIBBits);
// 初始化新分配的内存，设定初始值为255
lpDst = (char *)lpNewDIBBits;
memset(lpDst, (BYTE)255, lLineBytes * lHeight);
//先找到最左上方的边界点
bFindStartPoint = false;
for (j = 0;j < lHeight && !bFindStartPoint;j++)
{
  for(i = 0;i < lWidth && !bFindStartPoint;i++)
  {
// 指向源图像倒数第j行，第i个象素的指针
lpSrc = (char *)lpDIBBits + lLineBytes * j + i;

//取得当前指针处的像素值，注意要转换为unsigned char型
pixel = (unsigned char)*lpSrc;

if(pixel == 0)
{
bFindStartPoint = true;
StartPoint.Height = j;
StartPoint.Width = i;
// 指向目标图像倒数第j行，第i个象素的指针
lpDst = (char *)lpNewDIBBits + lLineBytes * j + i;
*lpDst = (unsigned char)0;
}
  }
}
//由于起始点是在左下方，故起始扫描沿左上方向
BeginDirect = 0;
//跟踪边界
bFindStartPoint = false;
//从初始点开始扫描
CurrentPoint.Height = StartPoint.Height;
CurrentPoint.Width = StartPoint.Width;
while(!bFindStartPoint)
{
  bFindPoint = false;
  while(!bFindPoint)
  {
//沿扫描方向查看一个像素
lpSrc = (char *)lpDIBBits + lLineBytes* ( CurrentPoint.Height + Direction[BeginDirect][1])
+ (CurrentPoint.Width + Direction[BeginDirect][0]);
pixel = (unsigned char)*lpSrc;
if(pixel == 0)
{
bFindPoint = true;
CurrentPoint.Height = CurrentPoint.Height + Direction[BeginDirect][1];
CurrentPoint.Width = CurrentPoint.Width + Direction[BeginDirect][0];
if(CurrentPoint.Height == StartPoint.Height && CurrentPoint.Width == StartPoint.Width)
{
   bFindStartPoint = true;
}
lpDst = (char *)lpNewDIBBits + lLineBytes* CurrentPoint.Height + CurrentPoint.Width;
*lpDst = (unsigned char)0;
//扫描的方向逆时针旋转两格
BeginDirect--;
if(BeginDirect == -1)
   BeginDirect = 7;
BeginDirect--;
if(BeginDirect == -1)
   BeginDirect = 7;
}
else
{
//扫描方向顺时针旋转一格
BeginDirect++;
if(BeginDirect == 8)
   BeginDirect = 0;
}
  }
}
// 复制腐蚀后的图像
memcpy(lpDIBBits, lpNewDIBBits, lWidth * lHeight);
// 释放内存
LocalUnlock(hNewDIBBits);
LocalFree(hNewDIBBits);

// 返回
return TRUE;
}

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