grblit.c

freetype库的应用demo,里面包含freetype的很多实例

            pixel[0] = (short)color2;
          }
          else if ( val >= 2 )
          {
            /* compose gray value */
            int   pix = (int)*pixel;
            int   dr  = pix & 0xF800;
            int   dg  = pix & 0x07E0;
            int   db  = pix & 0x001F;

            dr  = pix & 0xF800;
            dr += ((sr-dr)*val) >> 8;
            dr &= 0xF800;
            
            dg  = pix & 0x07E0;
            dg += ((sg-dg)*val) >> 8;
            dg &= 0x7E0;
            
            db  = pix & 0x001F;
            db += ((sb-db)*val) >> 8;
            db += 0x001F;

            *pixel = (short)( dr | dg | db );
          }
        }
        _write +=2;
        _read  ++;
        x--;
      }

      read  += blit->read_line;
      write += blit->write_line;
      y--;
    }
    while (y > 0);
  }                           
#endif
  
  static
  void  blit_gray_to_565( grBlitter*  blit,
                          grColor     color,
                          int         max )
  {
    int             y;
    unsigned char*  read;
    unsigned char*  write;
    long            color2;

    read   = blit->read  + blit->xread;
    write  = blit->write + 2*blit->xwrite;

    color2 = color.value;
    extract565( color2, color );

    y = blit->height;
    do
    {
      unsigned char*  _read  = read;
      unsigned char*  _write = write;
      int             x      = blit->width;

      while (x > 0)
      {
        unsigned char    val;

        val = *_read;
        if (val)
        {
          unsigned short* pixel = (unsigned short*)_write;

          if (val == max)
          {
            pixel[0] = (short)color2;
          }
          else
          {
            /* compose gray value */
            unsigned short  pix16 = *pixel;
            grColor         pix;

            extract565( pix16, pix );

            compose_pixel( pix, color, val, max );
            *pixel = (short)inject565( pix );
          }
        }
        _write +=2;
        _read  ++;
        x--;
      }

      read  += blit->read_line;
      write += blit->write_line;
      y--;
    }
    while (y > 0);
  }


/**************************************************************************/
/*                                                                        */
/* <Function> blit_gray_to_24                                             */
/*                                                                        */
/**************************************************************************/

#ifdef GRAY8
  static void
  blit_gray8_to_24( grBlitter*  blit,
                    grColor     color )
  {
    int             y;
    int             sr = color.chroma[0];
    int             sg = color.chroma[1];
    int             sb = color.chroma[2];
    unsigned char*  read;
    unsigned char*  write;

    read   = blit->read  + blit->xread;
    write  = blit->write + 3*blit->xwrite;

    y = blit->height;
    do
    {
      unsigned char*  _read  = read;
      unsigned char*  _write = write;
      int             x      = blit->width;

      while (x > 0)
      {
        unsigned char    val;

        val = *_read;
        if (val)
        {
          if (val >= 254)
          {
            _write[0] = (unsigned char)sr;
            _write[1] = (unsigned char)sg;
            _write[2] = (unsigned char)sb;
          }
          else if ( val >= 2 )
          {
            int  dr = _write[0];
            int  dg = _write[1];
            int  db = _write[2];
            
            dr += ((sr-dr)*val) >> 8;
            dg += ((sg-dg)*val) >> 8;
            db += ((sb-db)*val) >> 8;

            _write[0] = (unsigned char)dr;
            _write[1] = (unsigned char)dg,
            _write[2] = (unsigned char)db;
          }
        }
        _write += 3;
        _read  ++;
        x--;
      }

      read  += blit->read_line;
      write += blit->write_line;
      y--;
    }
    while (y > 0);
  }                    
#endif /* GRAY8 */


  static
  void  blit_gray_to_24( grBlitter*  blit,
                         grColor     color,
                         int         max )
  {
    int             y;
    unsigned char*  read;
    unsigned char*  write;

    read   = blit->read  + blit->xread;
    write  = blit->write + 3*blit->xwrite;

    y = blit->height;
    do
    {
      unsigned char*  _read  = read;
      unsigned char*  _write = write;
      int             x      = blit->width;

      while (x > 0)
      {
        unsigned char    val;

        val = *_read;
        if (val)
        {
          if (val == max)
          {
            _write[0] = color.chroma[0];
            _write[1] = color.chroma[1];
            _write[2] = color.chroma[2];
          }
          else
          {
            /* compose gray value */
            grColor pix;

            pix.chroma[0] = _write[0];
            pix.chroma[1] = _write[1];
            pix.chroma[2] = _write[2];

            compose_pixel( pix, color, val, max );

            _write[0] = pix.chroma[0];
            _write[1] = pix.chroma[1];
            _write[2] = pix.chroma[2];
          }
        }
        _write += 3;
        _read  ++;
        x--;
      }

      read  += blit->read_line;
      write += blit->write_line;
      y--;
    }
    while (y > 0);
  }


/**************************************************************************/
/*                                                                        */
/* <Function> blit_gray_to_32                                             */
/*                                                                        */
/**************************************************************************/

  static
  void  blit_gray_to_32( grBlitter*  blit,
                         grColor     color,
                         int         max )
  {
    int             y;
    unsigned char*  read;
    unsigned char*  write;

    read   = blit->read  + blit->xread;
    write  = blit->write + 4*blit->xwrite;

    y = blit->height;
    do
    {
      unsigned char*  _read  = read;
      unsigned char*  _write = write;
      int             x      = blit->width;

      while (x > 0)
      {
        unsigned char  val;

        val = *_read;
        if (val)
        {
          if (val == max)
          {
            _write[0] = color.chroma[0];
            _write[1] = color.chroma[1];
            _write[2] = color.chroma[2];
            _write[3] = color.chroma[3];
          }
          else
          {
            /* compose gray value */
            grColor pix;

            pix.chroma[0] = _write[0];
            pix.chroma[1] = _write[1];
            pix.chroma[2] = _write[2];

            compose_pixel( pix, color, val, max );

            _write[0] = pix.chroma[0];
            _write[1] = pix.chroma[1];
            _write[2] = pix.chroma[2];
          }
        }
        _write += 4;
        _read  ++;
        x--;
      }

      read  += blit->read_line;
      write += blit->write_line;
      y--;
    }
    while (y > 0);
  }


  static
  void  blit_gray8_to_32( grBlitter*  blit,
                          grColor     color )
  {
    blit_gray_to_32( blit, color, 255 );
  }                          


/**************************************************************************/
/*                                                                        */
/* <Function> blit_lcd_to_24                                              */
/*                                                                        */
/**************************************************************************/

#ifdef GRAY8
  static void
  blit_lcd8_to_24( grBlitter*  blit,
                   grColor     color )
  {
    int             y;
    int             sr = color.chroma[0];
    int             sg = color.chroma[1];
    int             sb = color.chroma[2];
    unsigned char*  read;
    unsigned char*  write;

    read   = blit->read  + 3*blit->xread;
    write  = blit->write + 3*blit->xwrite;

    y = blit->height;
    do
    {
      unsigned char*  _read  = read;
      unsigned char*  _write = write;
      int             x      = blit->width;

      while (x > 0)
      {
        int    val0, val1, val2;

        val0 = _read[0];
        val1 = _read[1];
        val2 = _read[2];

        if ( val0 | val1 | val2 )
        {
          if ( val0 == val1 &&
               val0 == val2 &&
               val0 == 255  )
          {
            _write[0] = (unsigned char)sr;
            _write[1] = (unsigned char)sg;
            _write[2] = (unsigned char)sb;
          }
          else
          {
            /* compose gray value */
            int   dr, dg, db;
            
            dr  = _write[0];
            dr += (sr-dr)*val0 >> 8;
            
            dg  = _write[1];
            dg += (sg-dg)*val1 >> 8;
            
            db  = _write[1];
            db += (sb-db)*val2 >> 8;
            
            _write[0] = dr;
            _write[1] = dg;
            _write[2] = db;
          }
        }
        _write += 3;
        _read  += 3;
        x--;
      }

      read  += blit->read_line;
      write += blit->write_line;
      y--;
    }
    while (y > 0);
  }
#endif /* GRAY8 */

  static void
  blit_lcd_to_24( grBlitter*  blit,
                  grColor     color,
                  int         max )
  {
    int             y;
    unsigned char*  read;
    unsigned char*  write;

    read   = blit->read  + 3*blit->xread;
    write  = blit->write + 3*blit->xwrite;

    y = blit->height;
    do
    {
      unsigned char*  _read  = read;
      unsigned char*  _write = write;
      int             x      = blit->width;

      while (x > 0)
      {
        int    val0, val1, val2;

        val0 = _read[0];
        val1 = _read[1];
        val2 = _read[2];

        if ( val0 | val1 | val2 )
        {
          if ( val0 == val1 &&
               val0 == val2 &&
               val0 == max  )
          {
            _write[0] = color.chroma[0];
            _write[1] = color.chroma[1];
            _write[2] = color.chroma[2];
          }
          else
          {
            /* compose gray value */
            grColor pix;

            pix.chroma[0] = _write[0];
            pix.chroma[1] = _write[1];
            pix.chroma[2] = _write[2];

            compose_pixel_full( pix, color, val0, val1, val2, max );

            _write[0] = pix.chroma[0];
            _write[1] = pix.chroma[1];
            _write[2] = pix.chroma[2];
          }
        }
        _write += 3;
        _read  += 3;
        x--;
      }

      read  += blit->read_line;
      write += blit->write_line;
      y--;
    }
    while (y > 0);
  }


#ifdef GRAY8
  static void
  blit_lcd28_to_24( grBlitter*  blit,
                    grColor     color )
  {
    int             y;
    int             sr = color.chroma[0];
    int             sg = color.chroma[1];
    int             sb = color.chroma[2];
    unsigned char*  read;
    unsigned char*  write;

    read   = blit->read  + 3*blit->xread;
    write  = blit->write + 3*blit->xwrite;

    y = blit->height;
    do
    {
      unsigned char*  _read  = read;
      unsigned char*  _write = write;
      int             x      = blit->width;

      while (x > 0)
      {
        int    val0, val1, val2;

        val0 = _read[2];
        val1 = _read[1];
        val2 = _read[0];

        if ( val0 | val1 | val2 )
        {
          if ( val0 == val1 &&
               val0 == val2 &&
               val0 == 255  )
          {
            _write[0] = (unsigned char)sr;
            _write[1] = (unsigned char)sg;
            _write[2] = (unsigned char)sb;
          }
          else
          {
            /* compose gray value */
            int   dr, dg, db;
            
            dr  = _write[0];
            dr += (sr-dr)*val0 >> 8;
            
            dg  = _write[1];
            dg += (sg-dg)*val1 >> 8;
            
            db  = _write[1];
            db += (sb-db)*val2 >> 8;
            
            _write[0] = dr;
            _write[1] = dg;
            _write[2] = db;
          }
        }
        _write += 3;
        _read  += 3;
        x--;
      }

      read  += blit->read_line;
      write += blit->write_line;
      y--;