本人初学c语言，请教些问题？关于bmp文件读取的~


#include <stdio.h>
#include <stdlib.h>
#pragma pack(1)
#include "bmp.h"

void bmp_read(char *file_name, COLOUR pixel[8][8])
{
    BITMAPFILEHEADER bmp_fileheader;
    BITMAPINFOHEADER bmp_infoheader;
    RGBQUAD    bmp_rgbquad[2];
    unsigned char one_line;

    int i,j;
    FILE *f_bmp;

    if ( (f_bmp = fopen(file_name, "rb")) == NULL)
    {
        printf("open bmp file: %s error\n", file_name);
        exit(1);
    }
        
    if (fread(&bmp_fileheader, sizeof(BITMAPFILEHEADER), 1, f_bmp) != 1)
    {
        printf("read bmp file header error\n");
        exit(1);
    }
    printf("bitmapfileheader = %d\n", sizeof(BITMAPFILEHEADER));
   
    if (fread(&bmp_infoheader, sizeof(BITMAPINFOHEADER), 1, f_bmp) != 1)
    {
        printf("read bmp file information header error\n");
        exit(1);
    }
    printf("bitmapinfoheader = %d\n", sizeof(BITMAPINFOHEADER));

    if (fread(bmp_rgbquad, sizeof(RGBQUAD), 2, f_bmp) != 2)
    {
        printf("read bmp 调色板 error\n");
        exit(1);
    }
    printf("index : red,  green,  blue  \n");

    for (i=0; i<2; i++)
        printf("%d  :    %.2x     %.2x      %.2x\n", i, bmp_rgbquad[i].rgbBlue, bmp_rgbquad[i].rgbGreen, bmp_rgbquad[i].rgbRed);

    for (i=0; i<bmp_infoheader.biHeight; i++)
    {
        if ( (fread(&one_line, sizeof(unsigned char), 1, f_bmp)) != 1)
        {
            printf("read one line error\n");
            exit(1);
        }
        fseek(f_bmp, sizeof(unsigned char)*3, SEEK_CUR);

        for (j=0; j<8; j++)        //二值图像->24位真彩色
        {
            pixel[i][j].rgbRed = bmp_rgbquad[one_line].rgbRed;
            pixel[i][j].rgbBlue = bmp_rgbquad[((one_line & 1<<(7-j))>>(7-j))].rgbBlue;//pixel[i][j].rgbRed;//((one_line & 1<<(7-j))>>(7-j)) * 255;
            pixel[i][j].rgbGreen = bmp_rgbquad[((one_line & 1<<(7-j))>>(7-j))].rgbGreen;//pixel[i][j].rgbRed;//((one_line & 1<<(7-j))>>(7-j)) * 255;

        }
    }

    fclose(f_bmp);
    printf("\n");
}





其中one_line起什么作用？
//二值图像->24位真彩色这一段帮忙解释一下？
当然如果能整段程序一起解释那最好了~

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