RGBQUAD *lpRGBquad;
lpRGBquad = (RGBQUAD *)&lpDIB[sizeof(BITMAPINFOHEADER)];
if(::DIBNumColors(lpDIB) == 256) //256色位图不作任何处理
{
return TRUE;
}
if(::DIBNumColors(lpDIB) != 256) //非256色位图将它灰度化
{
lLineBytes = WIDTHBYTES(lWidth*8*3);
lpdest= new BYTE[lHeight*lWidth];
lpDIBBits = (LPSTR)lpDIB + sizeof(BITMAPINFOHEADER);//指向DIB象素
for(i = 0;i < lHeight; i++)
for(j = 0;j < lWidth*3; j+=3)
{
ired = (unsigned char*)lpDIBBits + lLineBytes * i + j + 2;
igreen = (unsigned char*)lpDIBBits + lLineBytes * i + j + 1;
iblue = (unsigned char*)lpDIBBits + lLineBytes * i + j ;
lpdest[i*lWidth + j/3] = (unsigned char)((*ired)*0.299 + (*igreen)*0.588 + (*iblue)*0.114);
}
LPBITMAPINFOHEADER lpBI;
lpBI = (LPBITMAPINFOHEADER)lpDIB;
lpBI->biBitCount = 8;
//设置灰度调色板
for(i = 0;i < 256;i++)
{
lpRGBquad[i].rgbRed = (unsigned char)i;
lpRGBquad[i].rgbGreen = (unsigned char)i;
lpRGBquad[i].rgbBlue = (unsigned char)i;
lpRGBquad[i].rgbReserved = 0;
}
lpNewDIBBits= ::FindDIBBits(lpDIB); //找到DIB图像象素起始位置
lLineBytes=WIDTHBYTES(lWidth * 8);
//修改灰度值
for(i = 0;i < lHeight; i++)
for(j = 0;j < lWidth; j++)
{
lpSrc = (unsigned char*)lpNewDIBBits + lLineBytes * i+ j ;
*lpSrc=lpdest[i*lWidth+j];
}
delete lpdest;
}
return true;
}
虽然浏览了一遍孙鑫的C++视频，但对于上面的代码我还是看得一头雾水，跟在大学学的C++有很大的差别，看到上面函数和指针，看得特别吃力很难懂。希望大家能够给我推荐一些方法或者书籍，好让我能够继续坚持走下去
