picture_explorer.c

在linux下利用framebuffer编写的图片浏览程序

*(fbp + location) = color;

}
void char_init()
{
   int n=0,w=0;
   char init_char=' ';
   for(w=0;w<95;w++)
      {
          char_array[w].ch=init_char;
          init_char++;
          char_array[w].offset=n;
          n=(w+1)*27;
      }
        for(l=0;l<95;l++)
   {
 printf("%c %d ",char_array[l].ch,char_array[l].offset);
   }
}
///////////////////////////////////////////////////////////////////////////////////////////////////
void display_char(int d_screen_row,int d_screen_column,int d_height,int d_interval,int d_offset,unsigned char *d_after_convert_array)
{
   int r=0,q=0,temp=0,save_offset=0,count=0,row_count=0;
   temp=d_screen_column;
   save_offset=d_offset;
   for(r=d_screen_row;r<(d_screen_row+d_height);r++)
       {
         count++;
         d_offset=save_offset;
       for(temp=d_screen_column;temp<(d_screen_column+d_interval);temp++)
           {
            framebuffer(temp,r,*(d_after_convert_array+row_count*bytes+d_offset));
            d_offset++;
           }
         row_count++;
       }
}
///////////////////////////////////////////////////////////////////////////////////////////////////
void show_string(int s_screen_row,int s_screen_column,int s_height,int s_interval,char string[100],unsigned char *s_after_convert_array)
{
  char_init();
  printf("s_screen_row=%d,s_screen_column=%d\n",s_screen_row,s_screen_column);
  int vi=0,vj=0,vr=0,vc=0,number=0,counter=0;
  while(string[vi]!='\0')
    {
      printf("%c",string[vi]);
      vi++;
    }
    printf("The whole number is %d\n",vi);
    number=vi;
    for(vi=0;vi<number;vi++)
    {
      if(string[vi]==' ')
        {
         counter++;
         printf("counter=%d\n",counter);
         vr=s_screen_row;
         vc=s_screen_column;
         for(vr=s_screen_row;vr<(s_screen_row+s_height);vr++)
             for(vc=s_screen_column;vc<(s_screen_column+s_interval);vc++)   
                   framebuffer(vc,vr,0);
                   s_screen_column=s_screen_column+s_interval;
        }
      else
      {
      for(vj=0;vj<95;vj++)
         {
           if(string[vi]==char_array[vj].ch)
              {
               display_char(s_screen_row,s_screen_column,s_height,s_interval,char_array[vj].offset,s_after_convert_array);
               s_screen_column=s_screen_column+s_interval;
              }
         }
      }
     }
}
///////////////////////////////////////////////////////////////////////////////////////////////////
void clear_screen()
{
   int si,sj;
   for(si=0;si<800;si++)
      for(sj=0;sj<600;sj++)
        framebuffer(si,sj,0);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
void show_picture(int p_screen_row,int p_screen_column,int p_height,int p_width,unsigned char *p_after_convert_array)
{
  int pi,pj,r_count=0,p_offset=0;
  for(pi=p_screen_row;pi<(p_screen_row+p_height);pi++)
     {
      p_offset=0;
      r_count++;
     for(pj=p_screen_column;pj<(p_screen_column+p_width);pj++)
         {
          framebuffer(pj,pi,*(p_after_convert_array+r_count*p_width+p_offset));
          p_offset++;
         }
     }
}
///////////////////////////////////////////////////////////////////////////////////////////////////
void bmp(int b_screen_row,int b_screen_column,char *file_name,int tag,char input_string[100])
{
        FILE *bfp;
        int row=0,column=0;
        bfp=judge_bmp(file_name);
	print_head_info(bfp);
        width=bitmapinfoheader.biwidth;
        height=bitmapinfoheader.biheight;
        BytesPerLine=(width*8+31)/32*4;//计算每行的字节数
        bytes=BytesPerLine;
        printf("external variable bytes=%d\n",bytes);
        printf("BytesPerLine=%d\nWidth=%d  Height=%d\n",BytesPerLine,width,height);
	unsigned char pixel_array[height][BytesPerLine];//pixel_array数组中存储的是位图文件中的像素数据
        unsigned char after_convert_array[height][BytesPerLine];//after_convert_array数组存储的是经过转换变为framebuffer格式的数据
        unsigned char charbuffer[height][interval];
        //char_init();
        if(fread(&pixel,sizeof(char),1,bfp)!=1)
       {
	printf("fread error");
	exit(1);
       };
	fseek(bfp,1078, SEEK_SET);//将文件指针定位到实际存储像素处
        for(i=height-1;i>=0;i--)
        {
           fread(pixel_array[height-1-row],1,BytesPerLine,bfp);//从位图文件最下面一行读取像素信息(bmp文件像素存储是倒着的)
           for(column=0;column<BytesPerLine;column++)
              {
                after_convert_array[height-1-row][column]=convert(pixel_array[height-1-row][column]);
                //实际图像第一行的信息是存储在文件最后一行的  row的初始值为0
              }
           row++;
         }
        //clear_screen();
        if(tag==0)
        show_string(b_screen_row,b_screen_column,height,interval,input_string,&after_convert_array[0][0]);
        else if(tag==1)
        show_picture(((600-height)/2),((800-width)/2),height,width,&after_convert_array[0][0]);
	fclose(bfp);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
void page_one()
{
        char prompt;
        clear_screen();
        bmp(480,200,bitmapname,0,"First Picture");
        bmp(540,0,bitmapname,0,"PREV(p)");
        bmp(540,300,bitmapname,0,"MAIN(m)");
        bmp(540,600,bitmapname,0,"NEXT(n)");
        bmp(50,100,bp,1,"no string");
        scanf("%c",&prompt);
        if(prompt=='n')
            {
              printf("jump to page one\n");
              page_two();
            }
        else if((prompt=='p')||(prompt=='m'))
            main_page();
        else 
            printf("not jump\n");

}
void page_two()
{
        clear_screen();
        char prompt;
        bmp(480,200,bitmapname,0,"Second Picture");
        bmp(540,0,bitmapname,0,"PREV(p)");
        bmp(540,300,bitmapname,0,"MAIN(m)");
        bmp(540,600,bitmapname,0,"NEXT(n)");
        bmp(50,100,"4.bmp",1,"no string");
         scanf("%c",&prompt);
        if(prompt=='n')
            {
              printf("jump to page one\n");
              page_three();
            }
        else if(prompt=='p')
            page_one();
        else if(prompt=='m')
            main_page();
        else 
            printf("not jump\n");
}
void main_page()
{
   char prompt;
   bmp(200,100,bitmapname,0,"WELCOM TO LINUX WORLD");
   bmp(540,0,bitmapname,0,"BEGIN(b)");
   bmp(540,600,bitmapname,0,"JUMP(j)");
   scanf("%c",&prompt);
   if(prompt=='b')
      page_two();
}
void page_three()
{
        clear_screen();
        char prompt;
        bmp(300,200,bitmapname,0,"Thanks for watching!");
        bmp(540,0,bitmapname,0,"PREV(p)");
        bmp(540,300,bitmapname,0,"MAIN(m)");
        //bmp(540,600,bitmapname,0,"NEXT(n)");
        //bmp(50,100,bp,1,"no string");
         scanf("%c",&prompt);
        if(prompt=='p')
            page_two();
        else if(prompt=='m')
            main_page();
        else 
            printf("not jump\n");
}