2 ttf2png - True Type Font to PNG converter
3 Copyright (c) 2004-2008 Mikko Rasa
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.
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.
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
26 #include FT_FREETYPE_H
54 unsigned round_to_pot(unsigned);
56 void init_font(Font *, FT_Face, unsigned, unsigned, int);
57 void render_grid(Font *, unsigned, unsigned, unsigned, int);
58 void render_packed(Font *);
59 int save_defs(const char *, const Font *);
60 int save_png(const char *, const Image *, char);
64 int main(int argc, char **argv)
84 char *out_fn = "font.png";
95 while((i = getopt(argc, argv, "r:s:l:c:o:atvh?ed:p")) != -1)
102 if(!strcmp(optarg, "all"))
109 if(!isdigit(optarg[0]))
113 temp = strtol(optarg, &ptr, 0);
114 if(ptr[0]!=',' || !isdigit(ptr[1]))
119 printf("Not a valid range: %s\n", optarg);
125 end = strtol(ptr+1, NULL, 0);
130 size = strtol(optarg, NULL, 0);
133 cpl = strtol(optarg, NULL, 0);
136 if(!strcmp(optarg, "auto"))
141 else if(!strcmp(optarg, "autorect"))
148 cellw = strtol(optarg, &ptr, 0);
149 if(ptr[0]=='x' && isdigit(ptr[1]))
150 cellh = strtol(ptr+1, NULL, 0);
180 if(!strcmp(out_fn, "-"))
191 err = FT_Init_FreeType(&freetype);
194 fprintf(stderr, "Couldn't initialize FreeType library\n");
198 err = FT_New_Face(freetype, fn, 0, &face);
201 fprintf(stderr, "Couldn't load font file\n");
202 if(err==FT_Err_Unknown_File_Format)
203 fprintf(stderr, "Unknown file format\n");
209 const char *name = FT_Get_Postscript_Name(face);
210 printf("Font name: %s\n", name);
211 printf("Glyphs: %ld\n", face->num_glyphs);
214 err = FT_Set_Pixel_Sizes(face, 0, size);
217 fprintf(stderr, "Couldn't set size\n");
222 init_font(&font, face, begin, end, autohinter);
224 render_packed(&font);
226 render_grid(&font, cellw, cellh, cpl, seq);
227 save_png(out_fn, &font.image, alpha);
229 save_defs(def_fn, &font);
231 for(i=0; i<font.n_glyphs; ++i)
232 free(font.glyphs[i].image.data);
234 free(font.image.data);
237 FT_Done_FreeType(freetype);
242 unsigned round_to_pot(unsigned n)
256 printf("ttf2png - True Type Font to PNG converter\n"
257 "Copyright (c) 2004-2008 Mikko Rasa, Mikkosoft Productions\n"
258 "Distributed under the GNU General Public License\n\n"
259 "Usage: ttf2png [options] <TTF file>\n\n"
260 "Accepted options (default values in [brackets])\n"
261 " -r Range of characters to convert in the format low,high [0,255]\n"
262 " -s Font size to use, in pixels [10]\n"
263 " -l Number of characters to put in one line [auto]\n"
264 " -c Character cell size, in pixels [auto]\n"
265 " -o Output file name (or - for stdout) [font.png]\n"
266 " -a Force autohinter\n"
267 " -t Render font to alpha channel\n"
268 " -v Increase the level of verbosity\n"
269 " -e Use cells in sequence, rather than by code\n"
270 " -p Pack the glyphs tightly instead of in a grid\n"
271 " -d Write a definition to the given file\n"
272 " -h Print this message\n");
275 void init_font(Font *font, FT_Face face, unsigned first, unsigned last, int autohinter)
280 font->ascent = (face->size->metrics.ascender+63)>>6;
281 font->descent = (face->size->metrics.descender+63)>>6;
285 printf("Ascent: %d\n", font->ascent);
286 printf("Descent: %d\n", font->descent);
291 for(i=first; i<=last; ++i)
294 FT_Bitmap *bmp = &face->glyph->bitmap;
299 n = FT_Get_Char_Index(face, i);
304 flags |= FT_LOAD_FORCE_AUTOHINT;
305 FT_Load_Glyph(face, n, flags);
306 FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
309 printf(" Char %u: glyph %u, size %dx%d\n", i, n, bmp->width, bmp->rows);
311 if(bmp->pixel_mode!=FT_PIXEL_MODE_GRAY)
313 fprintf(stderr, "Warning: Glyph %u skipped, not grayscale\n", n);
317 if(font->n_glyphs>=size)
320 font->glyphs = (Glyph *)realloc(font->glyphs, size*sizeof(Glyph));
323 glyph = &font->glyphs[font->n_glyphs++];
325 glyph->image.w = bmp->width;
326 glyph->image.h = bmp->rows;
327 glyph->image.data = (char *)malloc(bmp->width*bmp->rows);
328 glyph->offset_x = face->glyph->bitmap_left;
329 glyph->offset_y = face->glyph->bitmap_top-bmp->rows;
330 glyph->advance = (int)(face->glyph->advance.x+32)/64;
334 for(y=0; y<bmp->rows; ++y) for(x=0; x<bmp->width; ++x)
335 glyph->image.data[x+(glyph->image.h-1-y)*glyph->image.w] = bmp->buffer[x-y*bmp->pitch];
339 for(y=0; y<bmp->rows; ++y) for(x=0; x<bmp->width; ++x)
340 glyph->image.data[x+y*glyph->image.w] = bmp->buffer[x+y*bmp->pitch];
345 printf("Loaded %u glyphs\n", font->n_glyphs);
348 void render_grid(Font *font, unsigned cellw, unsigned cellh, unsigned cpl, int seq)
351 int top = 0, bot = 0;
352 unsigned first, last;
353 unsigned maxw = 0, maxh = 0;
357 first = font->glyphs[0].code&~(i-1);
359 if(last>=font->glyphs[font->n_glyphs-1].code)
363 for(i=0; i<font->n_glyphs; ++i)
367 y = font->glyphs[i].offset_y+font->glyphs[i].image.h;
370 if(font->glyphs[i].offset_y<bot)
371 bot = font->glyphs[i].offset_y;
372 if(font->glyphs[i].image.w>maxw)
373 maxw = font->glyphs[i].image.w;
374 if(font->glyphs[i].image.h>maxh)
375 maxh = font->glyphs[i].image.h;
380 int square = (cellh==cellw);
394 printf("Max size: %u x %u\n", maxw, maxh);
395 printf("Y range: [%d %d]\n", bot, top);
396 printf("Cell size: %u x %u\n", cellw, cellh);
397 if(maxw>cellw || top-bot>cellh)
398 fprintf(stderr, "Warning: character size exceeds cell size\n");
403 unsigned count = (seq ? font->n_glyphs : last-first+1);
407 if(cpl>0 && (count+cpl-1)/cpl*cellh<=cpl*cellw)
412 font->image.w = round_to_pot(cpl*cellw);
413 if(seq && font->n_glyphs<last-first+1)
414 font->image.h = (font->n_glyphs+cpl-1)/cpl*cellh;
416 font->image.h = (last-first+cpl)/cpl*cellh;
417 font->image.h = round_to_pot(font->image.h);
419 font->image.data = (char *)malloc(font->image.w*font->image.h);
420 memset(font->image.data, 255, font->image.w*font->image.h);
422 for(i=0; i<font->n_glyphs; ++i)
428 glyph = &font->glyphs[i];
433 ci = glyph->code-first;
438 if(cellw>glyph->image.w)
439 cx += (cellw-glyph->image.w)/2;
440 cy += top-glyph->offset_y-glyph->image.h;
445 for(y=0; y<glyph->image.h; ++y) for(x=0; x<glyph->image.w; ++x)
447 if(cx+x<0 || cx+x>=font->image.w || cy+y<0 || cy+y>=font->image.h)
449 font->image.data[cx+x+(cy+y)*font->image.w] = 255-glyph->image.data[x+y*glyph->image.w];
454 void render_packed(Font *font)
458 unsigned last_h = 0xFFFF;
463 for(i=0; i<font->n_glyphs; ++i)
464 area+=(font->glyphs[i].image.w+1)*(font->glyphs[i].image.h+1);
466 for(font->image.w=1;; font->image.w<<=1)
468 font->image.h = (area*5/4)/font->image.w;
469 if(font->image.h<=font->image.w)
472 font->image.h = round_to_pot(font->image.h);
474 font->image.data = (char *)malloc(font->image.w*font->image.h);
475 memset(font->image.data, 255, font->image.w*font->image.h);
476 used_pixels = (char *)malloc(font->image.w*font->image.h);
477 memset(used_pixels, 0, font->image.w*font->image.h);
478 used_glyphs = (char *)malloc(font->n_glyphs);
479 memset(used_glyphs, 0, font->n_glyphs);
481 for(cy=0; cy<font->image.h;)
486 unsigned best_score = 0;
488 for(; (cx<font->image.w && used_pixels[cx+cy*font->image.w]); ++cx) ;
489 if(cx>=font->image.w)
496 for(w=0; (cx+w<font->image.w && !used_pixels[cx+w+cy*font->image.w]); ++w) ;
498 for(i=0; i<font->n_glyphs; ++i)
502 g = &font->glyphs[i];
503 if(!used_glyphs[i] && g->image.w<=w)
507 score = g->image.h+1;
508 if(g->image.h==last_h)
527 used_glyphs[glyph-font->glyphs] = 1;
531 for(y=0; y<glyph->image.h; ++y) for(x=0; x<glyph->image.w; ++x)
533 if(cx+x<0 || cx+x>=font->image.w || cy+y<0 || cy+y>=font->image.h)
535 font->image.data[cx+x+(cy+y)*font->image.w] = 255-glyph->image.data[x+y*glyph->image.w];
537 for(y=0; y<glyph->image.h+2; ++y) for(x=0; x<glyph->image.w+2; ++x)
539 if(cx+x<1 || cx+x>font->image.w || cy+y<1 || cy+y>font->image.h)
541 used_pixels[cx+x-1+(cy+y-1)*font->image.w] = 1;
544 last_h = glyph->image.h;
548 int save_defs(const char *fn, const Font *font)
553 out = fopen(fn, "w");
556 fprintf(stderr, "Couldn't open %s\n",fn);
560 fprintf(out, "%d %d %d %d %d\n", font->image.w, font->image.h, font->size, font->ascent, font->descent);
561 for(i=0; i<font->n_glyphs; ++i)
563 const Glyph *g = &font->glyphs[i];
564 fprintf(out, "%u %u %u %u %u %d %d %d\n", g->code, g->x, g->y, g->image.w, g->image.h, g->offset_x, g->offset_y, g->advance);
572 int save_png(const char *fn, const Image *image, char alpha)
577 png_byte *rows[image->h];
586 out = fopen(fn, "wb");
589 fprintf(stderr, "Couldn't open %s\n",fn);
594 pngs = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
597 fprintf(stderr, "Error writing PNG file\n");
600 pngi = png_create_info_struct(pngs);
603 png_destroy_write_struct(&pngs, NULL);
604 fprintf(stderr, "Error writing PNG file\n");
608 png_init_io(pngs, out);
611 data2 = (png_byte *)malloc(image->w*image->h*2);
612 for(i=0; i<image->w*image->h; ++i)
615 data2[i*2+1] = 255-image->data[i];
617 for(i=0; i<image->h; ++i)
618 rows[i] = (png_byte *)(data2+i*image->w*2);
619 color = PNG_COLOR_TYPE_GRAY_ALPHA;
623 for(i=0; i<image->h; ++i)
624 rows[i] = (png_byte *)(image->data+i*image->w);
625 color = PNG_COLOR_TYPE_GRAY;
627 png_set_IHDR(pngs, pngi, image->w, image->h, 8, color, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
628 png_set_rows(pngs, pngi, rows);
629 png_write_png(pngs, pngi, PNG_TRANSFORM_IDENTITY, NULL);
630 png_destroy_write_struct(&pngs, &pngi);
635 printf("Saved %dx%d PNG image to %s\n", image->w, image->h, fn);