source: npl/mediabox/lcdproc_edwin/src/server/drivers/text.c

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <string.h>
#include <sys/errno.h>

#include "lcd.h"
#include "text.h"
#include "drv_base.h"


lcd_logical_driver *text;

//////////////////////////////////////////////////////////////////////////
////////////////////// For Text-Mode Output //////////////////////////////
//////////////////////////////////////////////////////////////////////////

int text_init(lcd_logical_driver *driver, char *args) 
{
   text = driver;
   
   if(!driver->framebuf)
    {
      driver->close();
      return -1;
    }
  

  driver->wid = 20;
  driver->hgt = 4;
  driver->cellwid = 5;
  driver->cellhgt = 8;
  
  driver->clear = (void *)-1;
  driver->string = (void *)-1;
  driver->chr = (void *)-1;
  driver->vbar = text_vbar;
  driver->init_vbar = NULL;
  driver->hbar = text_hbar;
  driver->init_hbar = NULL;
  driver->num = (void *)-1;
  driver->init_num = NULL;
  
  driver->init = text_init;
  driver->close = text_close;
  driver->flush = text_flush;
  driver->flush_box = NULL;
  driver->contrast = NULL;
  driver->backlight = NULL;
  driver->set_char = NULL;
  driver->icon = NULL;
  driver->draw_frame = text_draw_frame;

  driver->getkey = NULL;


  return 200;  // 200 is arbitrary.  (must be 1 or more)
}

void text_close() 
{
  drv_base_close();
}

/////////////////////////////////////////////////////////////////
// Clears the LCD screen
//
void text_clear() 
{
  memset(lcd.framebuf, ' ', lcd.wid*lcd.hgt);
  
}


//////////////////////////////////////////////////////////////////
// Flushes all output to the lcd...
//
void text_flush()
{
  text_draw_frame(lcd.framebuf);
}


/////////////////////////////////////////////////////////////////
// Prints a string on the lcd display, at position (x,y).  The
// upper-left is (1,1), and the lower right should be (20,4).
//
void text_string(int x, int y, char string[]) 
{
  int i;

  x -= 1;  // Convert 1-based coords to 0-based...
  y -= 1;
  
  for(i=0; string[i]; i++)
    {
      lcd.framebuf[(y*lcd.wid) + x + i] = string[i];
    }
}

/////////////////////////////////////////////////////////////////
// Prints a character on the lcd display, at position (x,y).  The
// upper-left is (1,1), and the lower right should be (20,4).
//
void text_chr(int x, int y, char c) 
{
  y--;
  x--;
  
  lcd.framebuf[(y*lcd.wid) + x] = c;
}



int text_contrast(int contrast) 
{
//  printf("Contrast: %i\n", contrast);
   return 0;
}

void text_backlight(int on)
{
/*
  if(on)
  {
    printf("Backlight ON\n");
  }
  else
  {
    printf("Backlight OFF\n");
  }
*/
}

void text_init_vbar() 
{
//  printf("Vertical bars.\n");
}

void text_init_hbar() 
{
//  printf("Horizontal bars.\n");
}

void text_init_num() 
{
//  printf("Big Numbers.\n");
}

void text_num(int x, int num) 
{
//  printf("BigNum(%i, %i)\n", x, num);
}

void text_set_char(int n, char *dat)
{
//  printf("Set Character %i\n", n);
}

/////////////////////////////////////////////////////////////////
// Draws a vertical bar; erases entire column onscreen.
//
void text_vbar(int x, int len) 
{
  int y;
  for(y=lcd.hgt; y > 0 && len>0; y--)
    {
      text_chr(x, y, '|');

      len -= lcd.cellhgt;
    }
  
}

/////////////////////////////////////////////////////////////////
// Draws a horizontal bar to the right.
//
void text_hbar(int x, int y, int len) 
{
  for(; x<=lcd.wid && len>0; x++)
    {
      text_chr(x,y,'-');
      
      len -= lcd.cellwid;
    }
  
}


void text_flush_box(int lft, int top, int rgt, int bot)
{
  text_flush();
  
}


void text_draw_frame(char *dat)
{
  int i, j;

  char out[LCD_MAX_WIDTH];

  if(!dat) return;

//  printf("Frame (%ix%i): \n%s\n", lcd.wid, lcd.hgt, dat);

  for(i=0; i<lcd.wid; i++)
    {
      out[i] = '-';
    }
  out[lcd.wid] = 0;
  printf("+%s+\n", out);
  
  
  for(i=0; i<lcd.hgt; i++)
    {
      for(j=0; j<lcd.wid; j++)
        {
          out[j] = dat[j+(i*lcd.wid)];
        }
      out[lcd.wid] = 0;
      printf("|%s|\n", out);
      
    }
  
  for(i=0; i<lcd.wid; i++)
    {
      out[i] = '-';
    }
  out[lcd.wid] = 0;
  printf("+%s+\n", out);

}