#include <iostream>
#include <fstream>

using namespace std;

#pragma pack(1)
struct FILEHEADER
{
    char dummy1[18];    // 无用信息
    int width;                  // 图像宽
    int height;                 // 图像高
    char dummy2[28];      //无用信息
};

struct RGB
{
    unsigned char b; // 蓝
    unsigned char g; // 绿
    unsigned char r; // 红
};

int main()
{
    FILEHEADER imgHead1, imgHead2;
    RGB pixel1, pixel2, pixel;
    float blendRatio = 0.25;
    fstream imgFile1, imgFile2, imgFileResult;

    imgFile1.open("lighthouse.bmp", ios::in|ios::binary);
    imgFile2.open("penguins.bmp", ios::in|ios::binary);
    imgFileResult.open("result.bmp", ios::out|ios::binary);

    if(!imgFile1 || !imgFile2 || !imgFileResult)
    {
        cerr<<"File open or create error!"<<endl;
        return 0;
    }

    imgFile1.read((char *)(&imgHead1), sizeof(FILEHEADER));
    cout << imgHead1.width << "," << imgHead1.height << endl;
    imgFile2.read((char *)(&imgHead2), sizeof(FILEHEADER));
    cout << imgHead2.width << "," << imgHead2.height << endl;
    if(imgHead1.width!=imgHead2.width || imgHead1.height!=imgHead2.height || imgHead1.width%4!=0) return 0;
    imgFileResult.write((char *)(&imgHead1), sizeof(FILEHEADER));

    for(int i=0; i<(imgHead1.width*imgHead1.height); i++)
    {
        imgFile1.read((char *)(&pixel1), sizeof(RGB));
        imgFile2.read((char *)(&pixel2), sizeof(RGB));
        pixel.b = pixel1.b*blendRatio + pixel2.b*(1-blendRatio);
        pixel.g = pixel1.g*blendRatio + pixel2.g*(1-blendRatio);
        pixel.r = pixel1.r*blendRatio + pixel2.r*(1-blendRatio);
        imgFileResult.write((char *)(&pixel), sizeof(RGB));
    }

    imgFile1.close();
    imgFile2.close();
    imgFileResult.close();
    return 0;
}