ttf2png.c

   1 /*
   2 ttf2png - True Type Font to PNG converter
   3 Copyright (c) 2004-2007 Mikko Rasa
   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 offset_x;
  33         int offset_y;
  34         int advance;
  35 } GlyphDef;
  36
  37 unsigned round_to_pot(unsigned);
  38 void usage();
  39 int save_defs(const char *, const GlyphDef *, int, int, int, int, int, int);
  40 int save_png(const char *, const char *, int, int, char);
  41
  42 char verbose=0;
  43
  44 int main(int argc, char **argv)
  45 {
  46         char *fn;
  47         int  begin=0;
  48         int  end=255;
  49         int  size=10;
  50         int  cpl=16;
  51         int  cell=16;
  52         char autohinter=0;
  53         char seq=0;
  54         char alpha=0;
  55
  56         FT_Library freetype;
  57         FT_Face    face;
  58         int  ch,cw;
  59         int  ascent;
  60         int  descent;
  61
  62         int  err;
  63         int  i;
  64         int  count;
  65
  66         int  w,h;
  67         char *data;
  68         char *out_fn="font.png";
  69
  70         char *def_fn=NULL;
  71         GlyphDef *defs=NULL;
  72
  73         if(argc<2)
  74         {
  75                 usage();
  76                 return 1;
  77         }
  78
  79         while((i=getopt(argc, argv, "r:s:l:c:o:atvh?ed:"))!=-1)
  80         {
  81                 char *ptr;
  82                 int  temp;
  83                 switch(i)
  84                 {
  85                 case 'r':
  86                         if(!strcmp(optarg, "all"))
  87                         {
  88                                 begin=0;
  89                                 end=0x110000;
  90                         }
  91                         else
  92                         {
  93                                 if(!isdigit(optarg[0]))
  94                                         temp=-1;
  95                                 else
  96                                 {
  97                                         temp=strtol(optarg, &ptr, 0);
  98                                         if(ptr[0]!=',' || !isdigit(ptr[1]))
  99                                                 temp=-1;
 100                                 }
 101                                 if(temp<0)
 102                                 {
 103                                         printf("Not a valid range: %s\n", optarg);
 104                                         exit(1);
 105                                 }
 106                                 else
 107                                 {
 108                                         begin=temp;
 109                                         end=strtol(ptr+1, NULL, 0);
 110                                 }
 111                         }
 112                         break;
 113                 case 's':
 114                         size=strtol(optarg, NULL, 0);
 115                         break;
 116                 case 'l':
 117                         cpl=strtol(optarg, NULL, 0);
 118                         break;
 119                 case 'c':
 120                         cell=strtol(optarg, NULL, 0);
 121                         break;
 122                 case 'o':
 123                         out_fn=optarg;
 124                         break;
 125                 case 'a':
 126                         autohinter=1;
 127                         break;
 128                 case 't':
 129                         alpha=1;
 130                         break;
 131                 case 'v':
 132                         ++verbose;
 133                         break;
 134                 case 'h':
 135                 case '?':
 136                         usage();
 137                         return 0;
 138                 case 'e':
 139                         seq=1;
 140                         break;
 141                 case 'd':
 142                         def_fn=optarg;
 143                         break;
 144                 }
 145         }
 146         if(!strcmp(out_fn, "-"))
 147                 verbose=0;
 148
 149         if(optind!=argc-1)
 150         {
 151                 usage();
 152                 return 1;
 153         }
 154
 155         fn=argv[optind];
 156
 157         err=FT_Init_FreeType(&freetype);
 158         if(err)
 159         {
 160                 fprintf(stderr, "Couldn't initialize FreeType library\n");
 161                 return 1;
 162         }
 163
 164         err=FT_New_Face(freetype, fn, 0, &face);
 165         if(err)
 166         {
 167                 fprintf(stderr, "Couldn't load font file\n");
 168                 if(err==FT_Err_Unknown_File_Format)
 169                         fprintf(stderr, "Unknown file format\n");
 170                 return 1;
 171         }
 172
 173         if(verbose)
 174         {
 175                 const char *name=FT_Get_Postscript_Name(face);
 176                 printf("Font name: %s\n", name);
 177                 printf("Glyphs: %ld\n", face->num_glyphs);
 178         }
 179
 180         err=FT_Set_Pixel_Sizes(face, 0, size);
 181         if(err)
 182         {
 183                 fprintf(stderr, "Couldn't set size\n");
 184                 return 1;
 185         }
 186         ascent=(face->bbox.yMax*face->size->metrics.y_scale)>>16;
 187         ascent=(ascent+63)/64;
 188         descent=(face->bbox.yMin*face->size->metrics.y_scale)>>16;
 189         descent=(ascent+63)/64;
 190         ch=((face->bbox.yMax-face->bbox.yMin)*face->size->metrics.y_scale)>>16;
 191         ch=(ch+63)/64;
 192         cw=((face->bbox.xMax-face->bbox.xMin)*face->size->metrics.x_scale)>>16;
 193         cw=(cw+63)/64;
 194         if(verbose)
 195         {
 196                 printf("Ascent %d\n", ascent);
 197                 printf("Descent %d\n", descent);
 198                 printf("Max height %d\n", ch);
 199                 printf("Max width %d\n", cw);
 200         }
 201         if(verbose>=1 && (ch>cell || cw>cell)) fprintf(stderr,"Warning: character size exceeds cell size\n");
 202
 203         w=round_to_pot(cpl*cell);
 204         if(seq && face->num_glyphs<end-begin)
 205                 h=(face->num_glyphs+cpl-1)/cpl*cell;
 206         else
 207                 h=(end-begin+cpl-1)/cpl*cell;
 208         h=round_to_pot(h);
 209
 210         data=(char *)malloc(w*h);
 211         memset(data, 255, w*h);
 212
 213         if(def_fn)
 214         {
 215                 if(face->num_glyphs<end-begin)
 216                         count=face->num_glyphs;
 217                 else
 218                         count=end-begin;
 219
 220                 defs=(GlyphDef *)malloc(count*sizeof(GlyphDef));
 221         }
 222
 223         count=0;
 224         for(i=begin; i<=end; ++i)
 225         {
 226                 int       glyph=FT_Get_Char_Index(face,i);
 227                 FT_Bitmap *bmp=&face->glyph->bitmap;
 228                 int       x,y;
 229                 int       cx,cy;
 230                 int       flags=0;
 231                 int       dy;
 232
 233                 if(!glyph) continue;
 234
 235                 if(seq)
 236                 {
 237                         cx=(count%cpl)*cell;
 238                         cy=(count/cpl)*cell;
 239                 }
 240                 else
 241                 {
 242                         cx=(i%cpl)*cell;
 243                         cy=(i/cpl)*cell;
 244                 }
 245
 246                 if(autohinter)
 247                         flags|=FT_LOAD_FORCE_AUTOHINT;
 248                 FT_Load_Glyph(face, glyph, flags);
 249                 FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
 250                 if(cell>bmp->width)
 251                         cx+=(cell-bmp->width)/2;
 252                 dy=ascent-face->glyph->bitmap_top;
 253                 cy+=dy;
 254
 255                 if(verbose>=2)
 256                 {
 257                         printf("  Char %d: glyph %d, size %dx%d\n", i, glyph, bmp->width, bmp->rows);
 258                         if(bmp->width>cell || dy+bmp->rows>cell || dy<0) printf("  Warning: Character %d does not fit in cell\n", i);
 259                 }
 260
 261                 if(bmp->pitch<0)
 262                 {
 263                         fprintf(stderr, "Warning: Character %d not rendered (can't handle reversed bitmaps)\n", i);
 264                         continue;
 265                 }
 266
 267                 for(y=0; y<bmp->rows; ++y) for(x=0; x<bmp->width; ++x)
 268                 {
 269                         if(cx+x<0 || cx+x>=w || cy+y<0 || cy+y>=h) continue;
 270                         data[cx+x+(cy+y)*w]=255-bmp->buffer[x+y*bmp->pitch];
 271                 }
 272
 273                 if(def_fn)
 274                 {
 275                         defs[count].code=i;
 276                         defs[count].x=cx;
 277                         defs[count].y=cy;
 278                         defs[count].w=bmp->width;
 279                         defs[count].h=bmp->rows;
 280                         defs[count].offset_x=face->glyph->bitmap_left;
 281                         defs[count].offset_y=face->glyph->bitmap_top-bmp->rows;
 282                         defs[count].advance=(int)(face->glyph->advance.x+32)/64;
 283                 }
 284
 285                 ++count;
 286         }
 287
 288         while(seq && h/2>=(count+cpl-1)/cpl*cell)
 289                 h/=2;
 290
 291         if(def_fn)
 292                 save_defs(def_fn, defs, count, w, h, size, ascent, descent);
 293         save_png(out_fn, data, w, h, alpha);
 294
 295         if(verbose) printf("Converted %d glyphs\n", count);
 296
 297         return 0;
 298 }
 299
 300 unsigned round_to_pot(unsigned n)
 301 {
 302         n-=1;
 303         n|=n>>1;
 304         n|=n>>2;
 305         n|=n>>4;
 306         n|=n>>8;
 307         n|=n>>16;
 308
 309         return n+1;
 310 }
 311
 312 void usage()
 313 {
 314         printf("ttf2png - True Type Font to PNG converter\n"
 315                 "Copyright (c) 2004 Mikkosoft Productions\n"
 316                 "Distributed under the GNU General Public License\n\n"
 317                 "Usage: ttf2png [options] <TTF file>\n\n"
 318                 "Accepted options (default values in [brackets])\n"
 319                 "  -r  Range of characters to convert in the format low,high [0,255]\n"
 320                 "  -s  Font size to use, in pixels [10]\n"
 321                 "  -l  Number of characters to put in one line [16]\n"
 322                 "  -c  Character cell size, in pixels [16]\n"
 323                 "  -o  Output file name (or - for stdout) [font.png]\n"
 324                 "  -a  Force autohinter\n"
 325                 "  -t  Render font to alpha channel\n"
 326                 "  -v  Increase the level of verbosity\n"
 327                 "  -e  Use cells in sequence, rather than by code\n"
 328                 "  -d  Write a definition to the given file\n"
 329                 "  -h  Print this message\n");
 330 }
 331
 332 int save_defs(const char *fn, const GlyphDef *defs, int count, int w, int h, int size, int ascent, int descent)
 333 {
 334         FILE *out;
 335         int  i;
 336
 337         out=fopen(fn, "w");
 338         if(!out)
 339         {
 340                 fprintf(stderr, "Couldn't open %s\n",fn);
 341                 return -1;
 342         }
 343
 344         fprintf(out, "%d %d %d %d %d\n", w, h, size, ascent, descent);
 345         for(i=0; i<count; ++i)
 346         {
 347                 const GlyphDef *d=defs+i;
 348                 fprintf(out, "%d %d %d %d %d %d %d %d\n", d->code, d->x, d->y, d->w, d->h, d->offset_x, d->offset_y, d->advance);
 349         }
 350
 351         fclose(out);
 352
 353         return 0;
 354 }
 355
 356 int save_png(const char *fn, const char *data, int w, int h, char alpha)
 357 {
 358         FILE       *out;
 359         png_struct *pngs;
 360         png_info   *pngi;
 361         png_byte   *rows[h];
 362         int        i;
 363         png_byte   *data2;
 364         int        color;
 365
 366         if(!strcmp(fn, "-"))
 367                 out=stdout;
 368         else
 369         {
 370                 out=fopen(fn, "wb");
 371                 if(!out)
 372                 {
 373                         fprintf(stderr, "Couldn't open %s\n",fn);
 374                         return -1;
 375                 }
 376         }
 377
 378         pngs=png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 379         if(!pngs)
 380         {
 381                 fprintf(stderr, "Error writing PNG file\n");
 382                 return -1;
 383         }
 384         pngi=png_create_info_struct(pngs);
 385         if(!pngi)
 386         {
 387                 png_destroy_write_struct(&pngs, NULL);
 388                 fprintf(stderr, "Error writing PNG file\n");
 389                 return -1;
 390         }
 391
 392         png_init_io(pngs, out);
 393         if(alpha)
 394         {
 395                 data2=(png_byte *)malloc(w*h*2);
 396                 for(i=0; i<w*h; ++i)
 397                 {
 398                         data2[i*2]=255;
 399                         data2[i*2+1]=255-data[i];
 400                 }
 401                 for(i=0; i<h; ++i)
 402                         rows[i]=(png_byte *)(data2+i*w*2);
 403                 color=PNG_COLOR_TYPE_GRAY_ALPHA;
 404         }
 405         else
 406         {
 407                 for(i=0; i<h; ++i)
 408                         rows[i]=(png_byte *)(data+i*w);
 409                 color=PNG_COLOR_TYPE_GRAY;
 410         }
 411         png_set_IHDR(pngs, pngi, w, h, 8, color, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
 412         png_set_rows(pngs, pngi, rows);
 413         png_write_png(pngs, pngi, PNG_TRANSFORM_IDENTITY, NULL);
 414         png_destroy_write_struct(&pngs, &pngi);
 415         if(alpha) free(data2);
 416
 417         if(verbose) printf("Saved %dx%d PNG image to %s\n", w, h, fn);
 418
 419         return 0;
 420 }