linux下的framebuffer显示图片

void  showbmp2()

 {

     int x,y;

     unsigned char *p;

     int index=0;

     struct fb_var_screeninfo vinfo; 

     struct fb_fix_screeninfo finfo;

struct fb_bitfield red; 

     struct fb_bitfield green; 

     struct fb_bitfield blue;

//open the showdeviece

     fbfd = open("/dev/fb0", O_RDWR); 

     if (!fbfd) 

     { 

  printf("Error: cannot open framebuffer device.\n"); 

  exit(1); 

     } 

  

     if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) 

     { 

  printf("Error£ºreading fixed information.\n"); 

  exit(2); 

     } 

  

     if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) 

     { 

  printf("Error: reading variable information.\n"); 

  exit(3); 

     } 

  

     printf("R:%d,G:%d,B:%d \n", vinfo.red, vinfo.green, vinfo.blue ); 

  

     printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel ); 

     xres = vinfo.xres; 

     yres = vinfo.yres; 

     bits_per_pixel = vinfo.bits_per_pixel; 

  

     //ŒÆËãÆÁÄ»µÄ×ÜŽóС£š×֜ڣ©  

     screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8; 

     printf("screensize=%d byte\n",screensize); 

  

     //¶ÔÏóÓ³Éä  

     fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0); 


     if ((int)fbp == -1) 

     { 

  printf("Error: failed to map framebuffer device to memory.\n"); 

  exit(4); 

     } 

  

     printf("sizeof file header=%d\n", sizeof(BITMAPFILEHEADER)); 

  

     printf("into show_bmp function\n"); 

     FILE *fp[3];

fp[0] = fopen("./333.bmp","rb+");

  fp[1] = fopen("./444.bmp","rb+");

  fp[2] = fopen("./555.bmp","rb+");

fread(data,54,1,fp[0]);

     fread(data,WIDTH*HEIGHT*3,1,fp[0]);

     for(y=0;y<HEIGHT;y++)

     {

  for(x=0;x<WIDTH;x++)

  {

      //if(x<640)

      {

       buf[1][(((HEIGHT-1)-y)*WIDTH+x)*4 + 0] = data[((y*WIDTH) + x)*3 + 0];

          buf[1][(((HEIGHT-1)-y)*WIDTH+x)*4 + 1] = data[((y*WIDTH) + x)*3 + 1];

          buf[1][(((HEIGHT-1)-y)*WIDTH+x)*4 + 2] = data[((y*WIDTH) + x)*3 + 2];

          //buf[1][(479-y)*WIDTH+x)*4 + 3] = data[((y*640) + x)*3 + 0];

      }

  }

     }

 //

     fread(data,54,1,fp[1]);

     fread(data,WIDTH*HEIGHT*3,1,fp[1]);

     for(y=0;y<HEIGHT;y++)

     {

  for(x=0;x<WIDTH;x++)

  {

      //if(x<640)

      {

       buf[2][(((HEIGHT-1)-y)*WIDTH+x)*4 + 0] = data[((y*WIDTH) + x)*3 + 0];

          buf[2][(((HEIGHT-1)-y)*WIDTH+x)*4 + 1] = data[((y*WIDTH) + x)*3 + 1];

          buf[2][(((HEIGHT-1)-y)*WIDTH+x)*4 + 2] = data[((y*WIDTH) + x)*3 + 2];

          //buf[1][(479-y)*WIDTH+x)*4 + 3] = data[((y*640) + x)*3 + 0];

      }

  }

     }

 //

     fread(data,54,1,fp[2]);

     fread(data,WIDTH*HEIGHT*3,1,fp[2]);

     for(y=0;y<HEIGHT;y++)  

     {

  for(x=0;x<WIDTH;x++)

  {

     // if(x<640)

       {

       buf[3][(((HEIGHT-1)-y)*WIDTH+x)*4 + 0] = data[((y*WIDTH) + x)*3 + 0];

          buf[3][(((HEIGHT-1)-y)*WIDTH+x)*4 + 1] = data[((y*WIDTH) + x)*3 + 1];

          buf[3][(((HEIGHT-1)-y)*WIDTH+x)*4 + 2] = data[((y*WIDTH) + x)*3 + 2];

          //buf[1][(479-y)*WIDTH+x)*4 + 3] = data[((y*640) + x)*3 + 0];

      }

  }

     }

     fclose(fp[0]); fclose(fp[1]); fclose(fp[2]);

     //

     while(1)

     {

memcpy(fbp,buf[index++%picindex + 1],WIDTH*HEIGHT*4);

      sleep(2);

}   

     printf("/nover!/n");

return ;

 }