24位位图，旋转180

24位位图，旋转180，算法：

void roate180(BYTE *pData, int &image_width, int &image_height, int &bpp)
{
    int index = bpp/8;
    for (int h = 0; h < image_height/2; h++)
    {
        for (int w = 0; w < image_width; w++)
        {
            const int iCoordM = index*(h*image_width + w);
            const int iCoordN = index*((image_height - h -1)*image_width + w);
            BYTE Tmp = pData[iCoordM];
            pData[iCoordM] = pData[iCoordN];
            pData[iCoordN] = Tmp;
            Tmp = pData[iCoordM+1];
            pData[iCoordM + 1] = pData[iCoordN + 1]; 
            pData[iCoordN + 1] = Tmp;
            Tmp = pData[iCoordM + 2];
            pData[iCoordM + 2] = pData[iCoordN + 2];
            pData[iCoordN + 2] = Tmp;
        }
    }
}