#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>
//#define row 2//縱坐標(biāo)放大倍數(shù)
//#define col 2 //橫坐標(biāo)放大倍數(shù)
#define row 1
#define col 1

struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
long screensize=0;
char *fbp = 0;
  
//===========================================================畫點(diǎn)函數(shù)
int DrawPixel ( int x,int y,char color,char flag )
{ 
 //long location=x*2+y*1280;
 long location=(x+vinfo.xoffset)*(vinfo.bits_per_pixel/8)+(y+vinfo.yoffset)*finfo.line_length;
 if(flag)
 	{
 		switch(color)
 		{
 		case 'g':
 		     { *(fbp + location) = 0xe0; 
          *(fbp + location + 1) = 0x07; /* 綠色的色深*/ 
        break;}
    case 'r':  
          {*(fbp + location) = 0x0; /* 紅色的色深*/ 
          *(fbp + location+1) = 0xf8; 
        break;}
    case 'b':     
        {*(fbp + location) = 0x1f; /* 藍(lán)色的色深*/ 
        *(fbp + location+1) = 0x0;
        break;}
    }     
   }
   else
   	{
   		*(fbp + location) = 0x0; /* 紅色的色深*/ 
       *(fbp + location+1) = 0x0;
      }
 }
 //===============================================================顯示一個(gè)漢字
 DispChar(int x,int y,const char *str ,char flag )
{
	int i,n,j,k,m;
  FILE *fp;
  char buffer[32];
  unsigned char qh,wh;
  unsigned long offset;

  if((fp=fopen("./hzk16","rb"))==NULL)
  {
  printf("error,please try again\n");
  return 0;
  }
while(*str)
{
qh=*(str)-0xa0;
wh=*(str+1)-0xa0;
offset=(94*(qh-1)+(wh-1))*32L;//計(jì)算該漢字在字庫(kù)中偏移量
fseek(fp,offset,SEEK_SET);
fread(buffer,1,32,fp); //取出漢字32字節(jié)的點(diǎn)陣字模存入buffer中（一個(gè)漢字）
for(i=0;i<16;i++)
for(n=0;n<row;n++)
for( j=0;j<2;j++)
for( k=0;k<8;k++)
for(m=0;m<row;m++)
if((buffer[i*2+j]>>(7-k))&0x1)
DrawPixel(x+8*j*col+k*col+m,y+i*row+n,'r',1);
//將32位字節(jié)的點(diǎn)陣按位在屏幕上畫出來
str+=2;//因?yàn)橐粋€(gè)漢字內(nèi)碼占用兩個(gè)字節(jié),所以s必須加2
//x+=35;
x+=30;
}
return 1;
}


//=============================================================主函數(shù)
int main () {
int fp=0;
int x,y;
fp = open ("/dev/fb0",O_RDWR);//打開液晶的緩存
if (fp < 0){
printf("Error : Can not open framebuffer device\n");
exit(1);
}

if (ioctl(fp,FBIOGET_FSCREENINFO,&finfo)){
printf("Error reading fixed information\n");
exit(2);
}

if (ioctl(fp,FBIOGET_VSCREENINFO,&vinfo)){
printf("Error reading variable information\n");
exit(3);
}

screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
printf("%d,%d", vinfo.xres,vinfo.yres);
/*這就是把fp所指的文件中從開始到screensize大小的內(nèi)容給映射出來，得到一個(gè)指向這塊空間的指針*/
fbp =(char *) mmap (0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fp,0);
  if ((int) fbp == -1)
    {
     printf ("Error: failed to map framebuffer device to memory.\n");
      exit (4);
    }
memset(fbp , 0 ,screensize);//清屏
//寫幾個(gè)字
//for(x=150;x<360;x++)
for(x=80;x<160;x++)
 for(y=72;y<108;y++)
  //for(y=150;y<;x++)
   DrawPixel(x,y,'b',1);
//DispChar(150,75,"直",1);
/*
DispChar(150,75,"直接進(jìn)入系統(tǒng)",1);
DispChar(150,125,"使用網(wǎng)線升級(jí)",1);
DispChar(150,175,"使用優(yōu)盤升級(jí)",1);
*/
DispChar(100,75,"電腦",1);
DispChar(400,75,"顯示器",1);  
DispChar(600,75,"回收站",1);
DispChar(100,275,"瀏覽器",1);
DispChar(400,275,"寬帶",1);
DispChar(600,275,"信箱",1);
   munmap (fbp, screensize); /*解除映射*/
  close (fp); /*關(guān)閉文件*/
  return 0;
}