图片翻转（Raw Image）

int TransformImageBuffer(unsigned char* pImageBuffer, int width, int height,unsigned char* targetImageBuffer)
{
        //center flip
    int nRet = 0;
    int length = width * height;
    for(int i = 0; i < length / 2; i++)
    {
        targetImageBuffer[i] = pImageBuffer[length -i -1];
        targetImageBuffer[length -i -1] = pImageBuffer[i];
    }
    //vertical flip
    for(int h = 0; h < height; h++)
    {
        int firstLine = h * width;
        for(int w = 0; w < width /2; w++)
        {
            int temp = targetImageBuffer[firstLine + w];
            targetImageBuffer[firstLine + w] = targetImageBuffer[firstLine + width - w - 1];
            targetImageBuffer[firstLine + width - w - 1] = temp;
        }
    }
    
    //horizon flip
    for(int i = 0; i < length /2; i++)
    {
        int line = i / width;
        int seq = i % width;
        int mirrorPoint = (height - line - 1) * width - 1 + seq;
        targetImageBuffer[i] = pImageBuffer[mirrorPoint];
        targetImageBuffer[mirrorPoint] = pImageBuffer[i];
    }
    return nRet;
}