/*
    text.cpp - extremely quick and dirty "font engine".
    Copyright (C) 2006 Mark boyd
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be fun to play,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

//Our "Font" is actually a png, containing the 96 ASCII characters from 32 to 127

#include "text.h"
#include "loadimag.h"

namespace text
{
  const int begin_char=32;
  const int end_char=128;   //this is 1 past the last character!
  
  SDL_Surface *the_font=0;
  bool initialised = false;
  int w;
  int h;
};

void text::init()
{
  if (initialised) return;
  
  the_font=load_image("font.png");
  initialised = true;
  h=the_font->h;
  w=the_font->w/(end_char-begin_char);
}

void text::exit()
{
  if (!initialised) return;
  
  SDL_FreeSurface(the_font);
  initialised = false;
}

void text::draw(const std::string &str, SDL_Surface *bmp, int x, int y, Uint32)
{
  init();
  //TODO: don't ignore colour!

  for(int i=0; i<str.size(); ++i)
  {
    char c=str[i];
    //If char is signed, you'll get a harmless compiler warning here.
    if (c<begin_char || c>=end_char) c='?';
    
    SDL_Rect from = {(c-begin_char)*w,0,w,h};
    SDL_Rect to   = {x+i*w, y, 0, 0};
    SDL_BlitSurface(the_font, &from, bmp, &to);
  }
  
  SDL_UpdateRect(bmp, x,y,str.size()*w,h);
}

void text::draw_centre(const std::string &str, SDL_Surface *bmp, int x, int y, Uint32 colour)
{
  text::draw(str, bmp, x-w*str.size()/2, y-h/2, colour);
}

int text::width(const std::string &s)
{
  return s.size()*w;
}