text: //----------------------------------------------------------------------------
  // Anti-Grain Geometry (AGG) - Version 2.5
  // A high quality rendering engine for C++
  // Copyright (C) 2002-2006 Maxim Shemanarev
  // Contact: mcseem@antigrain.com
  //          mcseemagg@yahoo.com
  //          http://antigrain.com
  // 
  // AGG 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.
  // 
  // AGG 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 AGG; if not, write to the Free Software
  // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
  // MA 02110-1301, USA.
  //----------------------------------------------------------------------------
  
  #include <stdio.h>
  #include "agg_font_freetype.h"
  #include "agg_bitset_iterator.h"
  #include "agg_renderer_scanline.h"
  
  
  namespace agg
  {
  
      //------------------------------------------------------------------------------
      //
      // This code implements the AUTODIN II polynomial
      // The variable corresponding to the macro argument "crc" should
      // be an unsigned long.
      // Oroginal code  by Spencer Garrett <srg@quick.com>
      //
  
      // generated using the AUTODIN II polynomial
      //   x^32 + x^26 + x^23 + x^22 + x^16 +
      //   x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + 1
      //
      //------------------------------------------------------------------------------
  
      static const unsigned crc32tab[256] = 
      {
         0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
         0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
         0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
         0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
         0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
         0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
         0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
         0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
         0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
         0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
         0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
         0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
         0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
         0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
         0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
         0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
         0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
         0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
         0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
         0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
         0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
         0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
         0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
         0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
         0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
         0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
         0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
         0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
         0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
         0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
         0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
         0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
         0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
         0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
         0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
         0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
         0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
         0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
         0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
         0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
         0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
         0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
         0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
         0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
         0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
         0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
         0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
         0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
         0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
         0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
         0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
         0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
         0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
         0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
         0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
         0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
         0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
         0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
         0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
         0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
         0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
         0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
         0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
         0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
      };
  
  
      //------------------------------------------------------------------------------
  
      static unsigned calc_crc32(const unsigned char* buf, unsigned size)
      {
          unsigned crc = (unsigned)~0;
          const unsigned char* p;
          unsigned len = 0; 
          unsigned nr = size;
  
          for (len += nr, p = buf; nr--; ++p) 
          {
              crc = (crc >> 8) ^ crc32tab[(crc ^ *p) & 0xff];
          }
          return ~crc;
      }
  
      //------------------------------------------------------------------------
      static inline int dbl_to_plain_fx(double d)
      {
          return int(d * 65536.0);
      }
  
      //------------------------------------------------------------------------
      static inline double int26p6_to_dbl(int p)
      {
          return double(p) / 64.0;
      }
  
      //------------------------------------------------------------------------
      static inline int dbl_to_int26p6(double p)
      {
          return int(p * 64.0 + 0.5);
      }
  
  
      //------------------------------------------------------------------------
      template<class PathStorage>
      bool decompose_ft_outline(const FT_Outline& outline,
                                bool flip_y,
                                const trans_affine& mtx,
                                PathStorage& path)
      {   
          typedef typename PathStorage::value_type value_type;
  
          FT_Vector   v_last;
          FT_Vector   v_control;
          FT_Vector   v_start;
          double x1, y1, x2, y2, x3, y3;
  
          FT_Vector*  point;
          FT_Vector*  limit;
          char*       tags;
  
          int   n;         // index of contour in outline
          int   first;     // index of first point in contour
          char  tag;       // current point's state
  
          first = 0;
  
          for(n = 0; n < outline.n_contours; n++)
          {
              int  last;  // index of last point in contour
  
              last  = outline.contours[n];
              limit = outline.points + last;
  
              v_start = outline.points[first];
              v_last  = outline.points[last];
  
              v_control = v_start;
  
              point = outline.points + first;
              tags  = outline.tags  + first;
              tag   = FT_CURVE_TAG(tags[0]);
  
              // A contour cannot start with a cubic control point!
              if(tag == FT_CURVE_TAG_CUBIC) return false;
  
              // check first point to determine origin
              if( tag == FT_CURVE_TAG_CONIC)
              {
                  // first point is conic control.  Yes, this happens.
                  if(FT_CURVE_TAG(outline.tags[last]) == FT_CURVE_TAG_ON)
                  {
                      // start at last point if it is on the curve
                      v_start = v_last;
                      limit--;
                  }
                  else
                  {
                      // if both first and last points are conic,
                      // start at their middle and record its position
                      // for closure
                      v_start.x = (v_start.x + v_last.x) / 2;
                      v_start.y = (v_start.y + v_last.y) / 2;
  
                      v_last = v_start;
                  }
                  point--;
                  tags--;
              }
  
              x1 = int26p6_to_dbl(v_start.x);
              y1 = int26p6_to_dbl(v_start.y);
              if(flip_y) y1 = -y1;
              mtx.transform(&x1, &y1);
              path.move_to(value_type(dbl_to_int26p6(x1)), 
                           value_type(dbl_to_int26p6(y1)));
  
              while(point < limit)
              {
                  point++;
                  tags++;
  
                  tag = FT_CURVE_TAG(tags[0]);
                  switch(tag)
                  {
                      case FT_CURVE_TAG_ON:  // emit a single line_to
                      {
                          x1 = int26p6_to_dbl(point->x);
                          y1 = int26p6_to_dbl(point->y);
                          if(flip_y) y1 = -y1;
                          mtx.transform(&x1, &y1);
                          path.line_to(value_type(dbl_to_int26p6(x1)), 
                                       value_type(dbl_to_int26p6(y1)));
                          //path.line_to(conv(point->x), flip_y ? -conv(point->y) : conv(point->y));
                          continue;
                      }
  
                      case FT_CURVE_TAG_CONIC:  // consume conic arcs
                      {
                          v_control.x = point->x;
                          v_control.y = point->y;
  
                      Do_Conic:
                          if(point < limit)
                          {
                              FT_Vector vec;
                              FT_Vector v_middle;
  
                              point++;
                              tags++;
                              tag = FT_CURVE_TAG(tags[0]);
  
                              vec.x = point->x;
                              vec.y = point->y;
  
                              if(tag == FT_CURVE_TAG_ON)
                              {
                                  x1 = int26p6_to_dbl(v_control.x);
                                  y1 = int26p6_to_dbl(v_control.y);
                                  x2 = int26p6_to_dbl(vec.x);
                                  y2 = int26p6_to_dbl(vec.y);
                                  if(flip_y) { y1 = -y1; y2 = -y2; }
                                  mtx.transform(&x1, &y1);
                                  mtx.transform(&x2, &y2);
                                  path.curve3(value_type(dbl_to_int26p6(x1)), 
                                              value_type(dbl_to_int26p6(y1)),
                                              value_type(dbl_to_int26p6(x2)), 
                                              value_type(dbl_to_int26p6(y2)));
                                  continue;
                              }
  
                              if(tag != FT_CURVE_TAG_CONIC) return false;
  
                              v_middle.x = (v_control.x + vec.x) / 2;
                              v_middle.y = (v_control.y + vec.y) / 2;
  
                              x1 = int26p6_to_dbl(v_control.x);
                              y1 = int26p6_to_dbl(v_control.y);
                              x2 = int26p6_to_dbl(v_middle.x);
                              y2 = int26p6_to_dbl(v_middle.y);
                              if(flip_y) { y1 = -y1; y2 = -y2; }
                              mtx.transform(&x1, &y1);
                              mtx.transform(&x2, &y2);
                              path.curve3(value_type(dbl_to_int26p6(x1)), 
                                          value_type(dbl_to_int26p6(y1)),
                                          value_type(dbl_to_int26p6(x2)), 
                                          value_type(dbl_to_int26p6(y2)));
  
                              //path.curve3(conv(v_control.x), 
                              //            flip_y ? -conv(v_control.y) : conv(v_control.y), 
                              //            conv(v_middle.x), 
                              //            flip_y ? -conv(v_middle.y) : conv(v_middle.y));
  
                              v_control = vec;
                              goto Do_Conic;
                          }
  
                          x1 = int26p6_to_dbl(v_control.x);
                          y1 = int26p6_to_dbl(v_control.y);
                          x2 = int26p6_to_dbl(v_start.x);
                          y2 = int26p6_to_dbl(v_start.y);
                          if(flip_y) { y1 = -y1; y2 = -y2; }
                          mtx.transform(&x1, &y1);
                          mtx.transform(&x2, &y2);
                          path.curve3(value_type(dbl_to_int26p6(x1)), 
                                      value_type(dbl_to_int26p6(y1)),
                                      value_type(dbl_to_int26p6(x2)), 
                                      value_type(dbl_to_int26p6(y2)));
  
                          //path.curve3(conv(v_control.x), 
                          //            flip_y ? -conv(v_control.y) : conv(v_control.y), 
                          //            conv(v_start.x), 
                          //            flip_y ? -conv(v_start.y) : conv(v_start.y));
                          goto Close;
                      }
  
                      default:  // FT_CURVE_TAG_CUBIC
                      {
                          FT_Vector vec1, vec2;
  
                          if(point + 1 > limit || FT_CURVE_TAG(tags[1]) != FT_CURVE_TAG_CUBIC)
                          {
                              return false;
                          }
  
                          vec1.x = point[0].x; 
                          vec1.y = point[0].y;
                          vec2.x = point[1].x; 
                          vec2.y = point[1].y;
  
                          point += 2;
                          tags  += 2;
  
                          if(point <= limit)
                          {
                              FT_Vector vec;
  
                              vec.x = point->x;
                              vec.y = point->y;
  
                              x1 = int26p6_to_dbl(vec1.x);
                              y1 = int26p6_to_dbl(vec1.y);
                              x2 = int26p6_to_dbl(vec2.x);
                              y2 = int26p6_to_dbl(vec2.y);
                              x3 = int26p6_to_dbl(vec.x);
                              y3 = int26p6_to_dbl(vec.y);
                              if(flip_y) { y1 = -y1; y2 = -y2; y3 = -y3; }
                              mtx.transform(&x1, &y1);
                              mtx.transform(&x2, &y2);
                              mtx.transform(&x3, &y3);
                              path.curve4(value_type(dbl_to_int26p6(x1)), 
                                          value_type(dbl_to_int26p6(y1)),
                                          value_type(dbl_to_int26p6(x2)), 
                                          value_type(dbl_to_int26p6(y2)),
                                          value_type(dbl_to_int26p6(x3)), 
                                          value_type(dbl_to_int26p6(y3)));
  
                              //path.curve4(conv(vec1.x), 
                              //            flip_y ? -conv(vec1.y) : conv(vec1.y), 
                              //            conv(vec2.x), 
                              //            flip_y ? -conv(vec2.y) : conv(vec2.y),
                              //            conv(vec.x), 
                              //            flip_y ? -conv(vec.y) : conv(vec.y));
                              continue;
                          }
  
                          x1 = int26p6_to_dbl(vec1.x);
                          y1 = int26p6_to_dbl(vec1.y);
                          x2 = int26p6_to_dbl(vec2.x);
                          y2 = int26p6_to_dbl(vec2.y);
                          x3 = int26p6_to_dbl(v_start.x);
                          y3 = int26p6_to_dbl(v_start.y);
                          if(flip_y) { y1 = -y1; y2 = -y2; y3 = -y3; }
                          mtx.transform(&x1, &y1);
                          mtx.transform(&x2, &y2);
                          mtx.transform(&x3, &y3);
                          path.curve4(value_type(dbl_to_int26p6(x1)), 
                                      value_type(dbl_to_int26p6(y1)),
                                      value_type(dbl_to_int26p6(x2)), 
                                      value_type(dbl_to_int26p6(y2)),
                                      value_type(dbl_to_int26p6(x3)), 
                                      value_type(dbl_to_int26p6(y3)));
  
                          //path.curve4(conv(vec1.x), 
                          //            flip_y ? -conv(vec1.y) : conv(vec1.y), 
                          //            conv(vec2.x), 
                          //            flip_y ? -conv(vec2.y) : conv(vec2.y),
                          //            conv(v_start.x), 
                          //            flip_y ? -conv(v_start.y) : conv(v_start.y));
                          goto Close;
                      }
                  }
              }
  
              path.close_polygon();
  
         Close:
              first = last + 1; 
          }
  
          return true;
      }
  
  
  
      //------------------------------------------------------------------------
      template<class Scanline, class ScanlineStorage>
      void decompose_ft_bitmap_mono(const FT_Bitmap& bitmap,
                                    int x, int y,
                                    bool flip_y,
                                    Scanline& sl,
                                    ScanlineStorage& storage)
      {
          int i;
          const int8u* buf = (const int8u*)bitmap.buffer;
          int pitch = bitmap.pitch;
          sl.reset(x, x + bitmap.width);
          storage.prepare();
          if(flip_y)
          {
              buf += bitmap.pitch * (bitmap.rows - 1);
              y += bitmap.rows;
              pitch = -pitch;
          }
          for(i = 0; i < bitmap.rows; i++)
          {
              sl.reset_spans();
              bitset_iterator bits(buf, 0);
              int j;
              for(j = 0; j < bitmap.width; j++)
              {
                  if(bits.bit()) sl.add_cell(x + j, cover_full);
                  ++bits;
              }
              buf += pitch;
              if(sl.num_spans())
              {
                  sl.finalize(y - i - 1);
                  storage.render(sl);
              }
          }
      }
  
  
  
      //------------------------------------------------------------------------
      template<class Rasterizer, class Scanline, class ScanlineStorage>
      void decompose_ft_bitmap_gray8(const FT_Bitmap& bitmap,
                                     int x, int y,
                                     bool flip_y,
                                     Rasterizer& ras,
                                     Scanline& sl,
                                     ScanlineStorage& storage)
      {
          int i, j;
          const int8u* buf = (const int8u*)bitmap.buffer;
          int pitch = bitmap.pitch;
          sl.reset(x, x + bitmap.width);
          storage.prepare();
          if(flip_y)
          {
              buf += bitmap.pitch * (bitmap.rows - 1);
              y += bitmap.rows;
              pitch = -pitch;
          }
          for(i = 0; i < bitmap.rows; i++)
          {
              sl.reset_spans();
              const int8u* p = buf;
              for(j = 0; j < bitmap.width; j++)
              {
                  if(*p) sl.add_cell(x + j, ras.apply_gamma(*p));
                  ++p;
              }
              buf += pitch;
              if(sl.num_spans())
              {
                  sl.finalize(y - i - 1);
                  storage.render(sl);
              }
          }
      }
  
  
  
  
  
  
  
  
  
  
  
  
  
      //------------------------------------------------------------------------
      font_engine_freetype_base::~font_engine_freetype_base()
      {
          unsigned i;
          for(i = 0; i < m_num_faces; ++i)
          {
              delete [] m_face_names[i];
              FT_Done_Face(m_faces[i]);
          }
          delete [] m_face_names;
          delete [] m_faces;
          delete [] m_signature;
          if(m_library_initialized) FT_Done_FreeType(m_library);
      }
  
  
      //------------------------------------------------------------------------
      font_engine_freetype_base::font_engine_freetype_base(bool flag32, 
                                                           unsigned max_faces) :
          m_flag32(flag32),
          m_change_stamp(0),
          m_last_error(0),
          m_name(0),
          m_name_len(256-16-1),
          m_face_index(0),
          m_char_map(FT_ENCODING_NONE),
          m_signature(new char [256+256-16]),
          m_height(0),
          m_width(0),
          m_hinting(true),
          m_flip_y(false),
          m_library_initialized(false),
          m_library(0),
          m_faces(new FT_Face [max_faces]),
          m_face_names(new char* [max_faces]),
          m_num_faces(0),
          m_max_faces(max_faces),
          m_cur_face(0),
          m_resolution(0),
          m_glyph_rendering(glyph_ren_native_gray8),
          m_glyph_index(0),
          m_data_size(0),
          m_data_type(glyph_data_invalid),
          m_bounds(1,1,0,0),
          m_advance_x(0.0),
          m_advance_y(0.0),
  
          m_path16(),
          m_path32(),
          m_curves16(m_path16),
          m_curves32(m_path32),
          m_scanline_aa(),
          m_scanline_bin(),
          m_scanlines_aa(),
          m_scanlines_bin(),
          m_rasterizer()
      {
          m_curves16.approximation_scale(4.0);
          m_curves32.approximation_scale(4.0);
          m_last_error = FT_Init_FreeType(&m_library);
          if(m_last_error == 0) m_library_initialized = true;
      }
  
  
  
      //------------------------------------------------------------------------
      void font_engine_freetype_base::resolution(unsigned dpi) 
      { 
          m_resolution = dpi;
          update_char_size();
      }
  
  
      //------------------------------------------------------------------------
      int font_engine_freetype_base::find_face(const char* face_name) const
      {
          unsigned i;
          for(i = 0; i < m_num_faces; ++i)
          {
              if(strcmp(face_name, m_face_names[i]) == 0) return i;
          }
          return -1;
      }
  
  
      //------------------------------------------------------------------------
      double font_engine_freetype_base::ascender() const
      {
          if(m_cur_face)
          {
              return m_cur_face->ascender * height() / m_cur_face->height;
          }
          return 0.0;
      }
  
      //------------------------------------------------------------------------
      double font_engine_freetype_base::descender() const
      {
          if(m_cur_face)
          {
              return m_cur_face->descender * height() / m_cur_face->height;
          }
          return 0.0;
      }
  
  
      //------------------------------------------------------------------------
      bool font_engine_freetype_base::load_font(const char* font_name, 
                                                unsigned face_index,
                                                glyph_rendering ren_type,
                                                const char* font_mem, 
                                                const long font_mem_size)
      {
          bool ret = false;
  
          if(m_library_initialized)
          {
              m_last_error = 0;
  
              int idx = find_face(font_name);
              if(idx >= 0)
              {
                  m_cur_face = m_faces[idx];
                  m_name     = m_face_names[idx];
              }
              else
              {
                  if(m_num_faces >= m_max_faces)
                  {
                      delete [] m_face_names[0];
                      FT_Done_Face(m_faces[0]);
                      memcpy(m_faces, 
                             m_faces + 1, 
                             (m_max_faces - 1) * sizeof(FT_Face));
                      memcpy(m_face_names, 
                             m_face_names + 1, 
                             (m_max_faces - 1) * sizeof(char*));
                      m_num_faces = m_max_faces - 1;
                  }
  
                  if (font_mem && font_mem_size)
                  {
                      m_last_error = FT_New_Memory_Face(m_library, 
                                                        (const FT_Byte*)font_mem, 
                                                        font_mem_size, 
                                                        face_index, 
                                                        &m_faces[m_num_faces]);
                  }
                  else
                  {
                      m_last_error = FT_New_Face(m_library,
                                                 font_name,
                                                 face_index,
                                                 &m_faces[m_num_faces]);
                  }
  
                  if(m_last_error == 0)
                  {
                      m_face_names[m_num_faces] = new char [strlen(font_name) + 1];
                      strcpy(m_face_names[m_num_faces], font_name);
                      m_cur_face = m_faces[m_num_faces];
                      m_name     = m_face_names[m_num_faces];
                      ++m_num_faces;
                  }
                  else
                  {
                      m_face_names[m_num_faces] = 0;
                      m_cur_face = 0;
                      m_name = 0;
                  }
              }
  
  
              if(m_last_error == 0)
              {
                  ret = true;
                  
                  switch(ren_type)
                  {
                  case glyph_ren_native_mono:
                      m_glyph_rendering = glyph_ren_native_mono;
                      break;
  
                  case glyph_ren_native_gray8:
                      m_glyph_rendering = glyph_ren_native_gray8;
                      break;
  
                  case glyph_ren_outline:
                      if(FT_IS_SCALABLE(m_cur_face))
                      {
                          m_glyph_rendering = glyph_ren_outline;
                      }
                      else
                      {
                          m_glyph_rendering = glyph_ren_native_gray8;
                      }
                      break;
  
                  case glyph_ren_agg_mono:
                      if(FT_IS_SCALABLE(m_cur_face))
                      {
                          m_glyph_rendering = glyph_ren_agg_mono;
                      }
                      else
                      {
                          m_glyph_rendering = glyph_ren_native_mono;
                      }
                      break;
  
                  case glyph_ren_agg_gray8:
                      if(FT_IS_SCALABLE(m_cur_face))
                      {
                          m_glyph_rendering = glyph_ren_agg_gray8;
                      }
                      else
                      {
                          m_glyph_rendering = glyph_ren_native_gray8;
                      }
                      break;
                  }
                  update_signature();
              }
          }
          return ret;
      }
  
  
      //------------------------------------------------------------------------
      bool font_engine_freetype_base::attach(const char* file_name)
      {
          if(m_cur_face)
          {
              m_last_error = FT_Attach_File(m_cur_face, file_name);
              return m_last_error == 0;
          }
          return false;
      }
  
      //------------------------------------------------------------------------
      unsigned font_engine_freetype_base::num_faces() const
      {
          if(m_cur_face)
          {
              return m_cur_face->num_faces;
          }
          return 0;
      }
  
      //------------------------------------------------------------------------
      bool font_engine_freetype_base::char_map(FT_Encoding char_map)
      {
          if(m_cur_face)
          {
              m_last_error = FT_Select_Charmap(m_cur_face, m_char_map);
              if(m_last_error == 0)
              {
                  update_signature();
                  return true;
              }
          }
          return false;
      }
  
      //------------------------------------------------------------------------
      bool font_engine_freetype_base::height(double h)
      {
          m_height = int(h * 64.0);
          if(m_cur_face)
          {
              update_char_size();
              return true;
          }
          return false;
      }
  
      //------------------------------------------------------------------------
      bool font_engine_freetype_base::width(double w)
      {
          m_width = int(w * 64.0);
          if(m_cur_face)
          {
              update_char_size();
              return true;
          }
          return false;
      }
  
      //------------------------------------------------------------------------
      void font_engine_freetype_base::hinting(bool h)
      { 
          m_hinting = h; 
          if(m_cur_face)
          {
              update_signature();
          }
      }
  
      //------------------------------------------------------------------------
      void font_engine_freetype_base::flip_y(bool f)
      { 
          m_flip_y = f; 
          if(m_cur_face)
          {
              update_signature();
          }
      }
  
      //------------------------------------------------------------------------
      void font_engine_freetype_base::transform(const trans_affine& affine)
      {
          m_affine = affine;
          if(m_cur_face)
          {
              update_signature();
          }
      }
  
      //------------------------------------------------------------------------
      void font_engine_freetype_base::update_signature()
      {
          if(m_cur_face && m_name)
          {
              unsigned name_len = strlen(m_name);
              if(name_len > m_name_len)
              {
                  delete [] m_signature;
                  m_signature = new char [name_len + 32 + 256];
                  m_name_len = name_len + 32 - 1;
              }
  
              unsigned gamma_hash = 0;
              if(m_glyph_rendering == glyph_ren_native_gray8 ||
                 m_glyph_rendering == glyph_ren_agg_mono || 
                 m_glyph_rendering == glyph_ren_agg_gray8)
              {
                  unsigned char gamma_table[rasterizer_scanline_aa<>::aa_scale];
                  unsigned i;
                  for(i = 0; i < rasterizer_scanline_aa<>::aa_scale; ++i)
                  {
                      gamma_table[i] = m_rasterizer.apply_gamma(i);
                  }
                  gamma_hash = calc_crc32(gamma_table, sizeof(gamma_table));
              }
  
              sprintf(m_signature, 
                      "%s,%u,%d,%d,%d:%dx%d,%d,%d,%08X", 
                      m_name,
                      m_char_map,
                      m_face_index,
                      int(m_glyph_rendering),
                      m_resolution,
                      m_height,
                      m_width,
                      int(m_hinting),
                      int(m_flip_y),
                      gamma_hash);
              if(m_glyph_rendering == glyph_ren_outline ||
                 m_glyph_rendering == glyph_ren_agg_mono ||
                 m_glyph_rendering == glyph_ren_agg_gray8)
              {
                  double mtx[6];
                  char buf[100];
                  m_affine.store_to(mtx);
                  sprintf(buf, ",%08X%08X%08X%08X%08X%08X", 
                      dbl_to_plain_fx(mtx[0]), 
                      dbl_to_plain_fx(mtx[1]), 
                      dbl_to_plain_fx(mtx[2]), 
                      dbl_to_plain_fx(mtx[3]), 
                      dbl_to_plain_fx(mtx[4]), 
                      dbl_to_plain_fx(mtx[5]));
                  strcat(m_signature, buf);
              }
              ++m_change_stamp;
          }
      }
  
  
      //------------------------------------------------------------------------
      void font_engine_freetype_base::update_char_size()
      {
          if(m_cur_face)
          {
              if(m_resolution)
              {
                  FT_Set_Char_Size(m_cur_face, 
                                   m_width,       // char_width in 1/64th of points
                                   m_height,      // char_height in 1/64th of points
                                   m_resolution,  // horizontal device resolution 
                                   m_resolution); // vertical device resolution 
              }
              else
              {
                  FT_Set_Pixel_Sizes(m_cur_face,    
                                     m_width >> 6,    // pixel_width
                                     m_height >> 6);  // pixel_height
              }
              update_signature();
          }
      }
  
  
  
  
  
      //------------------------------------------------------------------------
      bool font_engine_freetype_base::prepare_glyph(unsigned glyph_code)
      {
          m_glyph_index = FT_Get_Char_Index(m_cur_face, glyph_code);
          m_last_error = FT_Load_Glyph(m_cur_face, 
                                       m_glyph_index, 
                                       m_hinting ? FT_LOAD_DEFAULT : FT_LOAD_NO_HINTING);
  //                                     m_hinting ? FT_LOAD_FORCE_AUTOHINT : FT_LOAD_NO_HINTING);
          if(m_last_error == 0)
          {
              switch(m_glyph_rendering)
              {
              case glyph_ren_native_mono:
                  m_last_error = FT_Render_Glyph(m_cur_face->glyph, FT_RENDER_MODE_MONO);
                  if(m_last_error == 0)
                  {
                      decompose_ft_bitmap_mono(m_cur_face->glyph->bitmap, 
                                               m_cur_face->glyph->bitmap_left,
                                               m_flip_y ? -m_cur_face->glyph->bitmap_top : 
                                                           m_cur_face->glyph->bitmap_top,
                                               m_flip_y,
                                               m_scanline_bin,
                                               m_scanlines_bin);
                      m_bounds.x1 = m_scanlines_bin.min_x();
                      m_bounds.y1 = m_scanlines_bin.min_y();
                      m_bounds.x2 = m_scanlines_bin.max_x() + 1;
                      m_bounds.y2 = m_scanlines_bin.max_y() + 1;
                      m_data_size = m_scanlines_bin.byte_size(); 
                      m_data_type = glyph_data_mono;
                      m_advance_x = int26p6_to_dbl(m_cur_face->glyph->advance.x);
                      m_advance_y = int26p6_to_dbl(m_cur_face->glyph->advance.y);
                      return true;
                  }
                  break;
  
  
              case glyph_ren_native_gray8:
                  m_last_error = FT_Render_Glyph(m_cur_face->glyph, FT_RENDER_MODE_NORMAL);
                  if(m_last_error == 0)
                  {
                      decompose_ft_bitmap_gray8(m_cur_face->glyph->bitmap, 
                                                m_cur_face->glyph->bitmap_left,
                                                m_flip_y ? -m_cur_face->glyph->bitmap_top : 
                                                            m_cur_face->glyph->bitmap_top,
                                                m_flip_y,
                                                m_rasterizer,
                                                m_scanline_aa,
                                                m_scanlines_aa);
                      m_bounds.x1 = m_scanlines_aa.min_x();
                      m_bounds.y1 = m_scanlines_aa.min_y();
                      m_bounds.x2 = m_scanlines_aa.max_x() + 1;
                      m_bounds.y2 = m_scanlines_aa.max_y() + 1;
                      m_data_size = m_scanlines_aa.byte_size(); 
                      m_data_type = glyph_data_gray8;
                      m_advance_x = int26p6_to_dbl(m_cur_face->glyph->advance.x);
                      m_advance_y = int26p6_to_dbl(m_cur_face->glyph->advance.y);
                      return true;
                  }
                  break;
  
  
              case glyph_ren_outline:
                  if(m_last_error == 0)
                  {
                      if(m_flag32)
                      {
                          m_path32.remove_all();
                          if(decompose_ft_outline(m_cur_face->glyph->outline,
                                                  m_flip_y, 
                                                  m_affine,
                                                  m_path32))
                          {
                              rect_d bnd  = m_path32.bounding_rect();
                              m_data_size = m_path32.byte_size();
                              m_data_type = glyph_data_outline;
                              m_bounds.x1 = int(floor(bnd.x1));
                              m_bounds.y1 = int(floor(bnd.y1));
                              m_bounds.x2 = int(ceil(bnd.x2));
                              m_bounds.y2 = int(ceil(bnd.y2));
                              m_advance_x = int26p6_to_dbl(m_cur_face->glyph->advance.x);
                              m_advance_y = int26p6_to_dbl(m_cur_face->glyph->advance.y);
                              m_affine.transform(&m_advance_x, &m_advance_y);
                              return true;
                          }
                      }
                      else
                      {
                          m_path16.remove_all();
                          if(decompose_ft_outline(m_cur_face->glyph->outline,
                                                  m_flip_y, 
                                                  m_affine,
                                                  m_path16))
                          {
                              rect_d bnd  = m_path16.bounding_rect();
                              m_data_size = m_path16.byte_size();
                              m_data_type = glyph_data_outline;
                              m_bounds.x1 = int(floor(bnd.x1));
                              m_bounds.y1 = int(floor(bnd.y1));
                              m_bounds.x2 = int(ceil(bnd.x2));
                              m_bounds.y2 = int(ceil(bnd.y2));
                              m_advance_x = int26p6_to_dbl(m_cur_face->glyph->advance.x);
                              m_advance_y = int26p6_to_dbl(m_cur_face->glyph->advance.y);
                              m_affine.transform(&m_advance_x, &m_advance_y);
                              return true;
                          }
                      }
                  }
                  return false;
  
              case glyph_ren_agg_mono:
                  if(m_last_error == 0)
                  {
                      m_rasterizer.reset();
                      if(m_flag32)
                      {
                          m_path32.remove_all();
                          decompose_ft_outline(m_cur_face->glyph->outline,
                                               m_flip_y, 
                                               m_affine,
                                               m_path32);
                          m_rasterizer.add_path(m_curves32);
                      }
                      else
                      {
                          m_path16.remove_all();
                          decompose_ft_outline(m_cur_face->glyph->outline,
                                               m_flip_y, 
                                               m_affine,
                                               m_path16);
                          m_rasterizer.add_path(m_curves16);
                      }
                      m_scanlines_bin.prepare(); // Remove all 
                      render_scanlines(m_rasterizer, m_scanline_bin, m_scanlines_bin);
                      m_bounds.x1 = m_scanlines_bin.min_x();
                      m_bounds.y1 = m_scanlines_bin.min_y();
                      m_bounds.x2 = m_scanlines_bin.max_x() + 1;
                      m_bounds.y2 = m_scanlines_bin.max_y() + 1;
                      m_data_size = m_scanlines_bin.byte_size(); 
                      m_data_type = glyph_data_mono;
                      m_advance_x = int26p6_to_dbl(m_cur_face->glyph->advance.x);
                      m_advance_y = int26p6_to_dbl(m_cur_face->glyph->advance.y);
                      m_affine.transform(&m_advance_x, &m_advance_y);
                      return true;
                  }
                  return false;
  
  
              case glyph_ren_agg_gray8:
                  if(m_last_error == 0)
                  {
                      m_rasterizer.reset();
                      if(m_flag32)
                      {
                          m_path32.remove_all();
                          decompose_ft_outline(m_cur_face->glyph->outline,
                                               m_flip_y, 
                                               m_affine,
                                               m_path32);
                          m_rasterizer.add_path(m_curves32);
                      }
                      else
                      {
                          m_path16.remove_all();
                          decompose_ft_outline(m_cur_face->glyph->outline,
                                               m_flip_y, 
                                               m_affine,
                                               m_path16);
                          m_rasterizer.add_path(m_curves16);
                      }
                      m_scanlines_aa.prepare(); // Remove all 
                      render_scanlines(m_rasterizer, m_scanline_aa, m_scanlines_aa);
                      m_bounds.x1 = m_scanlines_aa.min_x();
                      m_bounds.y1 = m_scanlines_aa.min_y();
                      m_bounds.x2 = m_scanlines_aa.max_x() + 1;
                      m_bounds.y2 = m_scanlines_aa.max_y() + 1;
                      m_data_size = m_scanlines_aa.byte_size(); 
                      m_data_type = glyph_data_gray8;
                      m_advance_x = int26p6_to_dbl(m_cur_face->glyph->advance.x);
                      m_advance_y = int26p6_to_dbl(m_cur_face->glyph->advance.y);
                      m_affine.transform(&m_advance_x, &m_advance_y);
                      return true;
                  }
                  return false;
              }
          }
          return false;
      }
  
  
  
  
      //------------------------------------------------------------------------
      void font_engine_freetype_base::write_glyph_to(int8u* data) const
      {
          if(data && m_data_size)
          {
              switch(m_data_type)
              {
              default: return;
              case glyph_data_mono:    m_scanlines_bin.serialize(data); break;
              case glyph_data_gray8:   m_scanlines_aa.serialize(data);  break;
              case glyph_data_outline: 
                  if(m_flag32)
                  {
                      m_path32.serialize(data);
                  }
                  else
                  {
                      m_path16.serialize(data);
                  }
                  break;
              case glyph_data_invalid: break;
              }
          }
      }
  
  
  
      //------------------------------------------------------------------------
      bool font_engine_freetype_base::add_kerning(unsigned first, unsigned second,
                                             double* x, double* y)
      {
          if(m_cur_face && first && second && FT_HAS_KERNING(m_cur_face))
          {
              FT_Vector delta;
              FT_Get_Kerning(m_cur_face, first, second,
                             FT_KERNING_DEFAULT, &delta);
              double dx = int26p6_to_dbl(delta.x);
              double dy = int26p6_to_dbl(delta.y);
              if(m_glyph_rendering == glyph_ren_outline ||
                 m_glyph_rendering == glyph_ren_agg_mono ||
                 m_glyph_rendering == glyph_ren_agg_gray8)
              {
                  m_affine.transform_2x2(&dx, &dy);
              }
              *x += dx;
              *y += dy;
  
              return true;
          }
          return false;
      }
  
  
  
  }
  
  
  