harbour-core/harbour/source/rtl/gtalleg/ssf.c

/*
 * $Id$
 */

/*
 *
 * This file was conceived while I was developing an allegro based gt
 * (gtAlleg) for xHarbour, so it is brought under the same license terms.
 *
 */

/*
 * xHarbour Project source code:
 * Simple Scalable Font library, main C module.
 *
 * Copyright 2004 Mauricio Abre <maurifull@datafull.com>
 * www - http: (yet to be constructed...)
 *
 * 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, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include "hbapi.h"
#include "ssf.h"
#include "fixedth.sfc"

#define fSize sfont->fsize
#define fLeft points[0]
#define fTop points[1]
#define fRight points[2]
#define fBottom points[3]
#define fLeft2 points[4]
#define fTop2 points[5]
#define fRight2 points[6]
#define fBottom2 points[7]

void ssfCreateThinFont(ssfFont *sfont)
{
   sfont->fsize = 16;                     /* default pitch */
   sfont->chars = s_ssfFixedThinChars;    /* chars */
}

void ssfSetFontSize(ssfFont *sfont, USHORT fsize)
{
   fSize = fsize;
}

USHORT ssfDrawChar(AL_BITMAP *dst, ssfFont *sfont, char c, int x, int y, int color)
{
   BYTE p;
   int i, j, thick;
   ssfGlyph charGlyph;
   ssfFrame charFrame;
   int points[8];
   float fScale;

   p = (BYTE) c;
   charGlyph = *sfont->chars[p];
   fScale = (float) ((float) sfont->fsize / (float) 65535);

   for( i = 0; i < charGlyph.num; i++ )
   {
      charFrame = charGlyph.frames[i];
      if( charFrame.ftype == SSF_SPLINE2 )
      {
         fLeft2 = x + (int) (fScale * charFrame.left);
         fTop2 = y + (int) (fScale * charFrame.top);
         fRight2 = x + (int) (fScale * charFrame.right);
         fBottom2 = y + (int) (fScale * charFrame.bottom);
      }
      else
      {
         fLeft = x + (int) (fScale * charFrame.left);
         fTop = y + (int) (fScale * charFrame.top);
         fRight = x + (int) (fScale * charFrame.right);
         fBottom = y + (int) (fScale * charFrame.bottom);
      }

      switch( charFrame.ftype )
      {
      case SSF_SPLINE2:
         thick = (int) (fScale * charFrame.thick);

         if( thick == 0 )
            thick++;

         for( j = 0; j < thick; j++ )
         {
            al_draw_spline(dst, points, color);
            switch( charFrame.thickdir )
            {
               case THICK_LEFT:
                  fLeft--;
                  fRight--;
                  fLeft2--;
                  fRight2--;
                  break;
               case THICK_UP:
                  fTop--;
                  fBottom--;
                  fTop2--;
                  fBottom2--;
                  break;
               case THICK_RIGHT:
                  fLeft++;
                  fRight++;
                  fLeft2++;
                  fRight2++;
                  break;
               case THICK_DOWN:
                  fTop++;
                  fBottom++;
                  fTop2++;
                  fBottom2++;
                  break;
            }
         }
         break;

      case SSF_LINE:
         thick = (int) (fScale * charFrame.thick);

         if( thick == 0 )
            thick++;

         for( j = 0; j < thick; j++ )
         {
            al_draw_line(dst, fLeft, fTop, fRight, fBottom, color);
            switch( charFrame.thickdir )
            {
               case THICK_LEFT:
                  fLeft--;
                  fRight--;
                  break;
               case THICK_UP:
                  fTop--;
                  fBottom--;
                  break;
               case THICK_RIGHT:
                  fLeft++;
                  fRight++;
                  break;
               case THICK_DOWN:
                  fTop++;
                  fBottom++;
                  break;
            }
         }
         break;

      case SSF_BOX:
         al_draw_rect_fill(dst, fLeft, fTop, fRight, fBottom, color);
         break;

      case SSF_TRIANGLE:
         thick = x + (int) (fScale * charFrame.thick);
         al_draw_triangle(dst, fLeft, fTop, fRight, fBottom, thick, y + (int) (fScale * charFrame.thickdir), color);
         break;
      }
   }

   return (sfont->fsize / 2);
}

int ssfDrawText(AL_BITMAP *dst, ssfFont *sfont, char *s, int x, int y, int color)
{
   int i = 0;

   while( s[i] )
   {
      x += ssfDrawChar(dst, sfont, s[i], x, y, color);
      i++;
   }

   return x;
}