c/c++ 图像RGB位存储，位操作

直接上代码：

#include <string.h>
#include <stdio.h>
#include <math.h>


typedef unsigned short    UINT16;    //store pixel rgb data
typedef unsigned char    BYTE;    //store r\g\b data



void main(){
    UINT16    pattern[640][480];    //16bit 640*480 rgb image.
    BYTE rgb[3];
    BYTE r;                        //rgb variable
    BYTE g;
    BYTE b;

    FILE *fp_read;
    fp_read = fopen("pattern_mem.bmp","r");    //open the source bitmap

    if(fp_read == NULL)
    {
        printf("can't open files!");
        return ;
    }

    char bmp_head[54];
    //读出BMP头，抛弃不要
    fread(bmp_head,sizeof(char)*54,1,fp_read);

    for(int i = 0 ; i < 480; i++)
        for(int j=0 ; j < 640; j++)
        {
            fread(rgb, 3, 1, fp_read);        //read rgb data of a pixel
            
            r = rgb[0];
            g = rgb[1];
            b = rgb[2];

            pattern[j][i] = ((r&0xf8)<<8)|((g&0xfc)<<3)|((b&0xf8)>>3);
        }
    fclose(fp_read);
    return ;
}