c/c++ 图像RGB位存储，位操作

直接上代码：
 1 #include <string.h>
 2 #include <stdio.h>
 3 #include <math.h>
 4 
 5 
 6 typedef unsigned short    UINT16;    //store pixel rgb data
 7 typedef unsigned char    BYTE;    //store r\g\b data
 8 
 9 
10 
11 void main(){
12     UINT16    pattern[640][480];    //16bit 640*480 rgb image.
13     BYTE rgb[3];
14     BYTE r;                        //rgb variable
15     BYTE g;
16     BYTE b;
17 
18     FILE *fp_read;
19     fp_read = fopen("pattern_mem.bmp","r");    //open the source bitmap
20 
21     if(fp_read == NULL)
22     {
23         printf("can't open files!");
24         return ;
25     }
26 
27     char bmp_head[54];
28     //读出BMP头，抛弃不要
29     fread(bmp_head,sizeof(char)*54,1,fp_read);
30 
31     for(int i = 0 ; i < 480; i++)
32         for(int j=0 ; j < 640; j++)
33         {
34             fread(rgb, 3, 1, fp_read);        //read rgb data of a pixel
35             
36             r = rgb[0];
37             g = rgb[1];
38             b = rgb[2];
39 
40             pattern[j][i] = ((r&0xf8)<<8)|((g&0xfc)<<3)|((b&0xf8)>>3);
41         }
42     fclose(fp_read);
43     return ;
44 }