ttf2png.c

   1 /*
   2 ttf2png - True Type Font to PNG converter
   3 Copyright (c) 2004 Mikkosoft Productions
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 */
  19
  20 #include <stdio.h>
  21 #include <unistd.h>
  22 #include <getopt.h>
  23 #include <png.h>
  24 #include <ft2build.h>
  25 #include FT_FREETYPE_H
  26
  27 unsigned round_to_pot(unsigned);
  28 void usage();
  29 int save_png(char *, char *, int, int);
  30
  31 char verbose=0;
  32 char alpha=0;
  33
  34 int main(int argc, char **argv)
  35 {
  36         FT_Library freetype;
  37         FT_Face    face;
  38         int  err;
  39         int  o;
  40         int  begin=0;
  41         int  end=255;
  42         char *fn;
  43         int  size=10;
  44         int  cpl=16;
  45         int  w,h;
  46         int  i;
  47         char *data;
  48         int  ch,cw;
  49         int  cell=16;
  50         int  ascent;
  51         char *out="font.png";
  52         char autohinter=0;
  53         int  count;
  54         char *def_fn=NULL;
  55         char seq=0;
  56         FILE *def=NULL;
  57
  58         if(argc<2)
  59         {
  60                 usage();
  61                 return 1;
  62         }
  63
  64         while((o=getopt(argc, argv, "r:s:l:c:o:atvh?ed:"))!=-1)
  65         {
  66                 char *ptr;
  67                 int  temp;
  68                 switch(o)
  69                 {
  70                 case 'r':
  71                         if(!strcmp(optarg, "all"))
  72                         {
  73                                 begin=0;
  74                                 end=0x110000;
  75                         }
  76                         else
  77                         {
  78                                 if(!isdigit(optarg[0]))
  79                                         temp=-1;
  80                                 else
  81                                 {
  82                                         temp=strtol(optarg, &ptr, 0);
  83                                         if(ptr[0]!=',' || !isdigit(ptr[1]))
  84                                                 temp=-1;
  85                                 }
  86                                 if(temp<0)
  87                                         printf("Not a valid range: %s\n", optarg);
  88                                 else
  89                                 {
  90                                         begin=temp;
  91                                         end=strtol(ptr+1, NULL, 0);
  92                                 }
  93                         }
  94                         break;
  95                 case 's':
  96                         size=strtol(optarg, NULL, 0);
  97                         break;
  98                 case 'l':
  99                         cpl=strtol(optarg, NULL, 0);
 100                         break;
 101                 case 'c':
 102                         cell=strtol(optarg, NULL, 0);
 103                         break;
 104                 case 'o':
 105                         out=optarg;
 106                         break;
 107                 case 'a':
 108                         autohinter=1;
 109                         break;
 110                 case 't':
 111                         alpha=1;
 112                         break;
 113                 case 'v':
 114                         ++verbose;
 115                         break;
 116                 case 'h':
 117                 case '?':
 118                         usage();
 119                         return 0;
 120                 case 'e':
 121                         seq=1;
 122                         break;
 123                 case 'd':
 124                         def_fn=optarg;
 125                         break;
 126                 }
 127         }
 128         if(!strcmp(out,"-"))
 129                 verbose=0;
 130
 131         if(optind!=argc-1)
 132         {
 133                 usage();
 134                 return 1;
 135         }
 136
 137         fn=argv[optind];
 138
 139         err=FT_Init_FreeType(&freetype);
 140         if(err)
 141         {
 142                 fprintf(stderr, "Couldn't initialize FreeType library\n");
 143                 return 1;
 144         }
 145
 146         err=FT_New_Face(freetype, fn, 0, &face);
 147         if(err)
 148         {
 149                 fprintf(stderr, "Couldn't load font file\n");
 150                 if(err==FT_Err_Unknown_File_Format)
 151                         fprintf(stderr, "Unknown file format\n");
 152                 return 1;
 153         }
 154
 155         if(verbose)
 156         {
 157                 const char *name=FT_Get_Postscript_Name(face);
 158                 printf("Font name: %s\n", name);
 159                 printf("Glyphs: %ld\n", face->num_glyphs);
 160         }
 161
 162         err=FT_Set_Pixel_Sizes(face, 0, size);
 163         if(err)
 164         {
 165                 fprintf(stderr, "Couldn't set size\n");
 166                 return 1;
 167         }
 168         ascent=(face->bbox.yMax*face->size->metrics.x_scale)>>16;
 169         ascent=(ascent+63)/64;
 170         ch=((face->bbox.yMax-face->bbox.yMin)*face->size->metrics.y_scale)>>16;
 171         ch=(ch+63)/64;
 172         cw=((face->bbox.xMax-face->bbox.xMin)*face->size->metrics.x_scale)>>16;
 173         cw=(cw+63)/64;
 174         if(verbose)
 175         {
 176                 printf("Ascent %d\n",ascent);
 177                 printf("Descent %ld\n",(((face->bbox.yMin*face->size->metrics.y_scale)>>16)+63)/64);
 178                 printf("Max height %d\n",ch);
 179                 printf("Max width %d\n",cw);
 180         }
 181         if(verbose>=1 && (ch>cell || cw>cell)) fprintf(stderr,"Warning: character size exceeds cell size\n");
 182
 183         w=round_to_pot(cpl*cell);
 184         if(seq)
 185                 h=(face->num_glyphs+cpl-1)/cpl*cell;
 186         else
 187                 h=(end-begin+cpl-1)/cpl*cell;
 188         h=round_to_pot(h);
 189
 190         data=(char *)malloc(w*h);
 191         memset(data, 255, w*h);
 192
 193         if(def_fn)
 194                 def=fopen(def_fn, "w");
 195
 196         if(def)
 197                 fprintf(def, "%d %d %d\n", w, h, size);
 198
 199         count=0;
 200         for(i=begin; i<=end; ++i)
 201         {
 202                 int       glyph=FT_Get_Char_Index(face,i);
 203                 FT_Bitmap *bmp=&face->glyph->bitmap;
 204                 int       x,y;
 205                 int       cx,cy;
 206                 int       flags=0;
 207                 int       dy;
 208
 209                 if(!glyph) continue;
 210
 211                 if(seq)
 212                 {
 213                         cx=(count%cpl)*cell;
 214                         cy=(count/cpl)*cell;
 215                 }
 216                 else
 217                 {
 218                         cx=(i%cpl)*cell;
 219                         cy=(i/cpl)*cell;
 220                 }
 221
 222                 if(autohinter)
 223                         flags|=FT_LOAD_FORCE_AUTOHINT;
 224                 FT_Load_Glyph(face, glyph, flags);
 225                 FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
 226                 if(cell>bmp->width)
 227                         cx+=(cell-bmp->width)/2;
 228                 dy=ascent-face->glyph->bitmap_top;
 229                 cy+=dy;
 230
 231                 if(verbose>=2)
 232                 {
 233                         printf("  Char %d: glyph %d, size %dx%d\n", i, glyph, bmp->width, bmp->rows);
 234                         if(bmp->width>cell || dy+bmp->rows>cell || dy<0) printf("  Warning: Character %d does not fit in cell\n", i);
 235                 }
 236
 237                 if(bmp->pitch<0)
 238                 {
 239                         fprintf(stderr, "Warning: Character %d not rendered (can't handle reversed bitmaps)\n", i);
 240                         continue;
 241                 }
 242
 243                 for(y=0; y<bmp->rows; ++y) for(x=0; x<bmp->width; ++x)
 244                 {
 245                         if(cx+x<0 || cx+x>=w || cy+y<0 || cy+y>=h) continue;
 246                         data[cx+x+(cy+y)*w]=255-bmp->buffer[x+y*bmp->pitch];
 247                 }
 248
 249                 if(def)
 250                         fprintf(def, "%d %d %d %d %d %d %d\n",i, cx, cy, bmp->width, bmp->rows, face->glyph->bitmap_top-bmp->rows, (int)(face->glyph->advance.x+32)/64);
 251
 252                 ++count;
 253         }
 254
 255         if(def)
 256                 fclose(def);
 257
 258         save_png(out, data, w, h);
 259
 260         if(verbose) printf("Converted %d glyphs\n",count);
 261
 262         return 0;
 263 }
 264
 265 unsigned round_to_pot(unsigned n)
 266 {
 267         n-=1;
 268         n|=n>>1;
 269         n|=n>>2;
 270         n|=n>>4;
 271         n|=n>>8;
 272         n|=n>>16;
 273
 274         return n+1;
 275 }
 276
 277 void usage()
 278 {
 279         printf("ttf2png - True Type Font to PNG converter\n"
 280                 "Copyright (c) 2004 Mikkosoft Productions\n"
 281                 "Distributed under the GNU General Public License\n\n"
 282                 "Usage: ttf2png [options] <TTF file>\n\n"
 283                 "Accepted options (default values in [brackets])\n"
 284                 "  -r  Range of characters to convert in the format low,high [0,255]\n"
 285                 "  -s  Font size to use, in pixels [10]\n"
 286                 "  -l  Number of characters to put in one line [16]\n"
 287                 "  -c  Character cell size, in pixels [16]\n"
 288                 "  -o  Output file name (or - for stdout) [font.png]\n"
 289                 "  -a  Force autohinter\n"
 290                 "  -t  Render font to alpha channel\n"
 291                 "  -v  Increase the level of verbosity\n"
 292                 "  -e  Use cells in sequence, rather than by code\n"
 293                 "  -d  Write a definition to the given file\n"
 294                 "  -h  Print this message\n");
 295 }
 296
 297 int save_png(char *fn, char *data, int w, int h)
 298 {
 299         FILE       *out;
 300         png_struct *pngs;
 301         png_info   *pngi;
 302         png_byte   *rows[h];
 303         int        i;
 304         png_byte   *data2;
 305         int        color;
 306
 307         if(!strcmp(fn, "-"))
 308                 out=stdout;
 309         else
 310         {
 311                 out=fopen(fn, "wb");
 312                 if(!out)
 313                 {
 314                         fprintf(stderr, "Couldn't open output file\n");
 315                         return -1;
 316                 }
 317         }
 318
 319         pngs=png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 320         if(!pngs)
 321         {
 322                 fprintf(stderr, "Error writing PNG file\n");
 323                 return -1;
 324         }
 325         pngi=png_create_info_struct(pngs);
 326         if(!pngi)
 327         {
 328                 png_destroy_write_struct(&pngs, NULL);
 329                 fprintf(stderr, "Error writing PNG file\n");
 330                 return -1;
 331         }
 332
 333         png_init_io(pngs, out);
 334         if(alpha)
 335         {
 336                 data2=(png_byte *)malloc(w*h*2);
 337                 for(i=0; i<w*h; ++i)
 338                 {
 339                         data2[i*2]=255;
 340                         data2[i*2+1]=255-data[i];
 341                 }
 342                 for(i=0; i<h; ++i)
 343                         rows[i]=(png_byte *)(data2+i*w*2);
 344                 color=PNG_COLOR_TYPE_GRAY_ALPHA;
 345         }
 346         else
 347         {
 348                 for(i=0; i<h; ++i)
 349                         rows[i]=(png_byte *)(data+i*w);
 350                 color=PNG_COLOR_TYPE_GRAY;
 351         }
 352         png_set_IHDR(pngs, pngi, w, h, 8, color, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
 353         png_set_rows(pngs, pngi, rows);
 354         png_write_png(pngs, pngi, PNG_TRANSFORM_IDENTITY, NULL);
 355         png_destroy_write_struct(&pngs, &pngi);
 356         if(alpha) free(data2);
 357
 358         if(verbose) printf("Saved %dx%d PNG image to %s\n", w, h, fn);
 359
 360         return 0;
 361 }