ttf2png.c

   1 /*
   2 ttf2png - True Type Font to PNG converter
   3 Copyright (c) 2004-2006 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 typedef struct sGlyphDef
  28 {
  29         int code;
  30         int x,y;
  31         int w,h;
  32         int ascent;
  33         int advance;
  34 } GlyphDef;
  35
  36 unsigned round_to_pot(unsigned);
  37 void usage();
  38 int save_defs(const char *, const GlyphDef *, int, int, int, int);
  39 int save_png(const char *, const char *, int, int, char);
  40
  41 char verbose=0;
  42
  43 int main(int argc, char **argv)
  44 {
  45         char *fn;
  46         int  begin=0;
  47         int  end=255;
  48         int  size=10;
  49         int  cpl=16;
  50         int  cell=16;
  51         char autohinter=0;
  52         char seq=0;
  53         char alpha=0;
  54
  55         FT_Library freetype;
  56         FT_Face    face;
  57         int  ch,cw;
  58         int  ascent;
  59
  60         int  err;
  61         int  i;
  62         int  count;
  63
  64         int  w,h;
  65         char *data;
  66         char *out_fn="font.png";
  67
  68         char *def_fn=NULL;
  69         GlyphDef *defs=NULL;
  70
  71         if(argc<2)
  72         {
  73                 usage();
  74                 return 1;
  75         }
  76
  77         while((i=getopt(argc, argv, "r:s:l:c:o:atvh?ed:"))!=-1)
  78         {
  79                 char *ptr;
  80                 int  temp;
  81                 switch(i)
  82                 {
  83                 case 'r':
  84                         if(!strcmp(optarg, "all"))
  85                         {
  86                                 begin=0;
  87                                 end=0x110000;
  88                         }
  89                         else
  90                         {
  91                                 if(!isdigit(optarg[0]))
  92                                         temp=-1;
  93                                 else
  94                                 {
  95                                         temp=strtol(optarg, &ptr, 0);
  96                                         if(ptr[0]!=',' || !isdigit(ptr[1]))
  97                                                 temp=-1;
  98                                 }
  99                                 if(temp<0)
 100                                 {
 101                                         printf("Not a valid range: %s\n", optarg);
 102                                         exit(1);
 103                                 }
 104                                 else
 105                                 {
 106                                         begin=temp;
 107                                         end=strtol(ptr+1, NULL, 0);
 108                                 }
 109                         }
 110                         break;
 111                 case 's':
 112                         size=strtol(optarg, NULL, 0);
 113                         break;
 114                 case 'l':
 115                         cpl=strtol(optarg, NULL, 0);
 116                         break;
 117                 case 'c':
 118                         cell=strtol(optarg, NULL, 0);
 119                         break;
 120                 case 'o':
 121                         out_fn=optarg;
 122                         break;
 123                 case 'a':
 124                         autohinter=1;
 125                         break;
 126                 case 't':
 127                         alpha=1;
 128                         break;
 129                 case 'v':
 130                         ++verbose;
 131                         break;
 132                 case 'h':
 133                 case '?':
 134                         usage();
 135                         return 0;
 136                 case 'e':
 137                         seq=1;
 138                         break;
 139                 case 'd':
 140                         def_fn=optarg;
 141                         break;
 142                 }
 143         }
 144         if(!strcmp(out_fn, "-"))
 145                 verbose=0;
 146
 147         if(optind!=argc-1)
 148         {
 149                 usage();
 150                 return 1;
 151         }
 152
 153         fn=argv[optind];
 154
 155         err=FT_Init_FreeType(&freetype);
 156         if(err)
 157         {
 158                 fprintf(stderr, "Couldn't initialize FreeType library\n");
 159                 return 1;
 160         }
 161
 162         err=FT_New_Face(freetype, fn, 0, &face);
 163         if(err)
 164         {
 165                 fprintf(stderr, "Couldn't load font file\n");
 166                 if(err==FT_Err_Unknown_File_Format)
 167                         fprintf(stderr, "Unknown file format\n");
 168                 return 1;
 169         }
 170
 171         if(verbose)
 172         {
 173                 const char *name=FT_Get_Postscript_Name(face);
 174                 printf("Font name: %s\n", name);
 175                 printf("Glyphs: %ld\n", face->num_glyphs);
 176         }
 177
 178         err=FT_Set_Pixel_Sizes(face, 0, size);
 179         if(err)
 180         {
 181                 fprintf(stderr, "Couldn't set size\n");
 182                 return 1;
 183         }
 184         ascent=(face->bbox.yMax*face->size->metrics.x_scale)>>16;
 185         ascent=(ascent+63)/64;
 186         ch=((face->bbox.yMax-face->bbox.yMin)*face->size->metrics.y_scale)>>16;
 187         ch=(ch+63)/64;
 188         cw=((face->bbox.xMax-face->bbox.xMin)*face->size->metrics.x_scale)>>16;
 189         cw=(cw+63)/64;
 190         if(verbose)
 191         {
 192                 printf("Ascent %d\n",ascent);
 193                 printf("Descent %ld\n",(((face->bbox.yMin*face->size->metrics.y_scale)>>16)+63)/64);
 194                 printf("Max height %d\n",ch);
 195                 printf("Max width %d\n",cw);
 196         }
 197         if(verbose>=1 && (ch>cell || cw>cell)) fprintf(stderr,"Warning: character size exceeds cell size\n");
 198
 199         w=round_to_pot(cpl*cell);
 200         if(seq && face->num_glyphs<end-begin)
 201                 h=(face->num_glyphs+cpl-1)/cpl*cell;
 202         else
 203                 h=(end-begin+cpl-1)/cpl*cell;
 204         h=round_to_pot(h);
 205
 206         data=(char *)malloc(w*h);
 207         memset(data, 255, w*h);
 208
 209         if(def_fn)
 210         {
 211                 if(face->num_glyphs<end-begin)
 212                         count=face->num_glyphs;
 213                 else
 214                         count=end-begin;
 215
 216                 defs=(GlyphDef *)malloc(count*sizeof(GlyphDef));
 217         }
 218
 219         count=0;
 220         for(i=begin; i<=end; ++i)
 221         {
 222                 int       glyph=FT_Get_Char_Index(face,i);
 223                 FT_Bitmap *bmp=&face->glyph->bitmap;
 224                 int       x,y;
 225                 int       cx,cy;
 226                 int       flags=0;
 227                 int       dy;
 228
 229                 if(!glyph) continue;
 230
 231                 if(seq)
 232                 {
 233                         cx=(count%cpl)*cell;
 234                         cy=(count/cpl)*cell;
 235                 }
 236                 else
 237                 {
 238                         cx=(i%cpl)*cell;
 239                         cy=(i/cpl)*cell;
 240                 }
 241
 242                 if(autohinter)
 243                         flags|=FT_LOAD_FORCE_AUTOHINT;
 244                 FT_Load_Glyph(face, glyph, flags);
 245                 FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
 246                 if(cell>bmp->width)
 247                         cx+=(cell-bmp->width)/2;
 248                 dy=ascent-face->glyph->bitmap_top;
 249                 cy+=dy;
 250
 251                 if(verbose>=2)
 252                 {
 253                         printf("  Char %d: glyph %d, size %dx%d\n", i, glyph, bmp->width, bmp->rows);
 254                         if(bmp->width>cell || dy+bmp->rows>cell || dy<0) printf("  Warning: Character %d does not fit in cell\n", i);
 255                 }
 256
 257                 if(bmp->pitch<0)
 258                 {
 259                         fprintf(stderr, "Warning: Character %d not rendered (can't handle reversed bitmaps)\n", i);
 260                         continue;
 261                 }
 262
 263                 for(y=0; y<bmp->rows; ++y) for(x=0; x<bmp->width; ++x)
 264                 {
 265                         if(cx+x<0 || cx+x>=w || cy+y<0 || cy+y>=h) continue;
 266                         data[cx+x+(cy+y)*w]=255-bmp->buffer[x+y*bmp->pitch];
 267                 }
 268
 269                 if(def_fn)
 270                 {
 271                         defs[count].code=i;
 272                         defs[count].x=cx;
 273                         defs[count].y=cy;
 274                         defs[count].w=bmp->width;
 275                         defs[count].h=bmp->rows;
 276                         defs[count].ascent=face->glyph->bitmap_top-bmp->rows;
 277                         defs[count].advance=(int)(face->glyph->advance.x+32)/64;
 278                 }
 279
 280                 ++count;
 281         }
 282
 283         while(seq && h/2>=(count+cpl-1)/cpl*cell)
 284                 h/=2;
 285
 286         if(def_fn)
 287                 save_defs(def_fn, defs, count, w, h, size);
 288         save_png(out_fn, data, w, h, alpha);
 289
 290         if(verbose) printf("Converted %d glyphs\n", count);
 291
 292         return 0;
 293 }
 294
 295 unsigned round_to_pot(unsigned n)
 296 {
 297         n-=1;
 298         n|=n>>1;
 299         n|=n>>2;
 300         n|=n>>4;
 301         n|=n>>8;
 302         n|=n>>16;
 303
 304         return n+1;
 305 }
 306
 307 void usage()
 308 {
 309         printf("ttf2png - True Type Font to PNG converter\n"
 310                 "Copyright (c) 2004 Mikkosoft Productions\n"
 311                 "Distributed under the GNU General Public License\n\n"
 312                 "Usage: ttf2png [options] <TTF file>\n\n"
 313                 "Accepted options (default values in [brackets])\n"
 314                 "  -r  Range of characters to convert in the format low,high [0,255]\n"
 315                 "  -s  Font size to use, in pixels [10]\n"
 316                 "  -l  Number of characters to put in one line [16]\n"
 317                 "  -c  Character cell size, in pixels [16]\n"
 318                 "  -o  Output file name (or - for stdout) [font.png]\n"
 319                 "  -a  Force autohinter\n"
 320                 "  -t  Render font to alpha channel\n"
 321                 "  -v  Increase the level of verbosity\n"
 322                 "  -e  Use cells in sequence, rather than by code\n"
 323                 "  -d  Write a definition to the given file\n"
 324                 "  -h  Print this message\n");
 325 }
 326
 327 int save_defs(const char *fn, const GlyphDef *defs, int count, int w, int h, int size)
 328 {
 329         FILE *out;
 330         int  i;
 331
 332         out=fopen(fn, "w");
 333         if(!out)
 334         {
 335                 fprintf(stderr, "Couldn't open %s\n",fn);
 336                 return -1;
 337         }
 338
 339         fprintf(out, "%d %d %d\n", w, h, size);
 340         for(i=0; i<count; ++i)
 341         {
 342                 const GlyphDef *d=defs+i;
 343                 fprintf(out, "%d %d %d %d %d %d %d\n", d->code, d->x, d->y, d->w, d->h, d->ascent, d->advance);
 344         }
 345
 346         fclose(out);
 347
 348         return 0;
 349 }
 350
 351 int save_png(const char *fn, const char *data, int w, int h, char alpha)
 352 {
 353         FILE       *out;
 354         png_struct *pngs;
 355         png_info   *pngi;
 356         png_byte   *rows[h];
 357         int        i;
 358         png_byte   *data2;
 359         int        color;
 360
 361         if(!strcmp(fn, "-"))
 362                 out=stdout;
 363         else
 364         {
 365                 out=fopen(fn, "wb");
 366                 if(!out)
 367                 {
 368                         fprintf(stderr, "Couldn't open %s\n",fn);
 369                         return -1;
 370                 }
 371         }
 372
 373         pngs=png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 374         if(!pngs)
 375         {
 376                 fprintf(stderr, "Error writing PNG file\n");
 377                 return -1;
 378         }
 379         pngi=png_create_info_struct(pngs);
 380         if(!pngi)
 381         {
 382                 png_destroy_write_struct(&pngs, NULL);
 383                 fprintf(stderr, "Error writing PNG file\n");
 384                 return -1;
 385         }
 386
 387         png_init_io(pngs, out);
 388         if(alpha)
 389         {
 390                 data2=(png_byte *)malloc(w*h*2);
 391                 for(i=0; i<w*h; ++i)
 392                 {
 393                         data2[i*2]=255;
 394                         data2[i*2+1]=255-data[i];
 395                 }
 396                 for(i=0; i<h; ++i)
 397                         rows[i]=(png_byte *)(data2+i*w*2);
 398                 color=PNG_COLOR_TYPE_GRAY_ALPHA;
 399         }
 400         else
 401         {
 402                 for(i=0; i<h; ++i)
 403                         rows[i]=(png_byte *)(data+i*w);
 404                 color=PNG_COLOR_TYPE_GRAY;
 405         }
 406         png_set_IHDR(pngs, pngi, w, h, 8, color, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
 407         png_set_rows(pngs, pngi, rows);
 408         png_write_png(pngs, pngi, PNG_TRANSFORM_IDENTITY, NULL);
 409         png_destroy_write_struct(&pngs, &pngi);
 410         if(alpha) free(data2);
 411
 412         if(verbose) printf("Saved %dx%d PNG image to %s\n", w, h, fn);
 413
 414         return 0;
 415 }