2 ttf.cc -- implement ttf -> pfa routine.
4 source file of the GNU LilyPond music typesetter
6 (c) 2005--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
10 #include "freetype.hh"
12 #include <freetype/tttables.h>
14 #include "memory-stream.hh"
16 #include "lily-guile.hh"
18 #include "open-type-font.hh"
22 make_index_to_charcode_map (FT_Face face)
24 Index_to_charcode_map m;
28 FT_CharMap current_cmap = face->charmap;
29 FT_Select_Charmap (face, FT_ENCODING_UNICODE);
32 for (charcode = FT_Get_First_Char (face, &gindex); gindex != 0;
33 charcode = FT_Get_Next_Char (face, charcode, &gindex))
38 FT_Set_Charmap (face, current_cmap);
44 Based on ttfps by Juliusz Chroboczek
47 print_header (void *out, FT_Face face)
49 lily_cookie_fprintf (out, "%%!PS-TrueTypeFont\n");
52 = (TT_Postscript *) FT_Get_Sfnt_Table (face, ft_sfnt_post);
55 lily_cookie_fprintf (out, "%%%%VMUsage: %d %d\n", 0, 0);
57 lily_cookie_fprintf (out, "%d dict begin\n", 11);
58 lily_cookie_fprintf (out, "/FontName /%s def\n",
59 FT_Get_Postscript_Name (face));
61 lily_cookie_fprintf (out, "/Encoding StandardEncoding def\n");
62 lily_cookie_fprintf (out, "/PaintType 0 def\n");
63 lily_cookie_fprintf (out, "/FontMatrix [1 0 0 1 0 0] def\n");
66 = (TT_Header *)FT_Get_Sfnt_Table (face, ft_sfnt_head);
68 lily_cookie_fprintf (out, "/FontBBox [%lf %lf %lf %lf] def\n",
69 float (ht->xMin) / ht->Units_Per_EM,
70 float (ht->yMin) / ht->Units_Per_EM,
71 float (ht->xMax) / ht->Units_Per_EM,
72 float (ht->yMax) / ht->Units_Per_EM);
74 lily_cookie_fprintf (out, "/FontType 42 def\n");
75 lily_cookie_fprintf (out, "/FontInfo 8 dict dup begin\n");
76 lily_cookie_fprintf (out, "/version (%.3f) def\n",
77 ht->Font_Revision / 65536.0);
82 lily_cookie_fprintf (out, "/Notice (");
83 fputpss (strings[0], out);
84 lily_cookie_fprintf (out, ") def\n");
88 lily_cookie_fprintf (out, "/FullName (");
89 fputpss (strings[4], out);
90 lily_cookie_fprintf (out, ") def\n");
94 lily_cookie_fprintf (out, "/FamilyName (");
95 fputpss (strings[1], out);
96 lily_cookie_fprintf (out, ") def\n");
100 lily_cookie_fprintf (out, "/isFixedPitch %s def\n",
101 pt->isFixedPitch ? "true" : "false");
102 lily_cookie_fprintf (out, "/UnderlinePosition %lf def\n",
103 float (pt->underlinePosition) / ht->Units_Per_EM);
104 lily_cookie_fprintf (out, "/UnderlineThickness %lf def\n",
105 float (pt->underlineThickness) / ht->Units_Per_EM);
106 lily_cookie_fprintf (out, "end readonly def\n");
109 #define CHUNKSIZE 65534
111 const FT_ULong FT_ENC_TAG (glyf_tag, 'g', 'l', 'y', 'f');
112 const FT_ULong FT_ENC_TAG (head_tag, 'h', 'e', 'a', 'd');
113 const FT_ULong FT_ENC_TAG (loca_tag, 'l', 'o', 'c', 'a');
116 void t42_write_table (void *out, FT_Face face, unsigned char const *buffer,
117 size_t s, bool is_glyf,
118 FT_ULong head_length, FT_ULong loca_length)
120 vector<FT_UShort> chunks;
124 /* compute chunk sizes */
125 unsigned char *head_buf = new unsigned char[head_length];
126 FT_Error error = FT_Load_Sfnt_Table (face, head_tag, 0, head_buf, NULL);
128 programming_error ("FT_Load_Sfnt_Table (): error.");
130 /* we access the lower byte of indexToLocFormat */
131 bool long_offsets = head_buf[4*4 + 2*2 + 2*8 + 4*2 + 3*2 + 1] == 1;
135 unsigned char *loca_buf = new unsigned char[loca_length];
136 error = FT_Load_Sfnt_Table (face, loca_tag, 0, loca_buf, NULL);
138 programming_error ("FT_Load_Sfnt_Table (): error.");
140 unsigned char *p = loca_buf;
141 unsigned char *endp = loca_buf + loca_length;
143 FT_ULong offset = 0, last_offset = 0, last_chunk = 0;
148 offset = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
153 offset = ((p[0] << 8) | p[1]) << 1;
156 if (offset > last_offset + CHUNKSIZE)
158 if (last_chunk != last_offset)
159 chunks.push_back (last_offset - last_chunk);
161 a single glyph with more than 64k data
162 is a pathological case but...
164 FT_ULong rest = offset - last_offset;
165 while (rest > CHUNKSIZE)
167 chunks.push_back (CHUNKSIZE);
170 chunks.push_back (rest);
173 else if (offset > last_chunk + CHUNKSIZE)
175 chunks.push_back (last_offset - last_chunk);
176 last_chunk = last_offset;
179 last_offset = offset;
181 chunks.push_back (s - last_chunk);
185 else if (s > CHUNKSIZE)
188 while (rest > CHUNKSIZE)
190 chunks.push_back (CHUNKSIZE);
193 chunks.push_back (rest);
196 chunks.push_back (CHUNKSIZE);
198 lily_cookie_fprintf (out, "\n"
202 static char xdigits[] = "0123456789ABCDEF";
204 int cur_chunk_idx = 0;
205 for (size_t j = 0; j < s; j++)
207 if (l >= chunks[cur_chunk_idx])
209 lily_cookie_fprintf (out, "\n"
217 lily_cookie_fprintf (out, "\n"
220 /* lily_cookie_fprintf (out,"%02X",(int)buffer[j]) is too slow */
221 lily_cookie_putc (xdigits[(buffer[j] & 0xF0) >> 4], out);
222 lily_cookie_putc (xdigits[buffer[j] & 0x0F], out);
227 /* pad to four-byte boundary */
228 while ((s ++) % 4 != 0)
229 lily_cookie_fprintf (out, "00");
231 lily_cookie_fprintf (out, "\n"
237 print_body (void *out, FT_Face face)
240 FT_ULong head_length = 0, loca_length = 0;
241 FT_ULong tag, length;
242 vector<FT_ULong> lengths, tags;
245 we must build our own TTF header -- the original font
246 might be a TTC where tables are not contiguous, or the font
247 contains tables which aren't indexed at all
249 while (FT_Sfnt_Table_Info (face, idx, &tag, &length)
250 != FT_Err_Table_Missing)
252 lengths.push_back (length);
253 tags.push_back (tag);
255 head_length = length;
256 else if (tag == loca_tag)
257 loca_length = length;
261 FT_ULong hlength = 12 + 16 * idx;
263 unsigned char *hbuf = new unsigned char[hlength];
266 hbuf[0] = 0x00; /* version */
270 hbuf[4] = (idx & 0xFF00) >> 8; /* numTables */
271 hbuf[5] = idx & 0x00FF;
273 FT_UInt searchRange, entrySelector, rangeShift;
275 for (i = 1, j = 2; j <= idx; i++, j <<= 1)
277 entrySelector = i - 1;
278 searchRange = 0x10 << entrySelector;
279 rangeShift = (idx << 4) - searchRange;
281 hbuf[6] = (searchRange & 0xFF00) >> 8;
282 hbuf[7] = searchRange & 0x00FF;
283 hbuf[8] = (entrySelector & 0xFF00) >> 8;
284 hbuf[9] = entrySelector & 0x00FF;
285 hbuf[10] = (rangeShift & 0xFF00) >> 8;
286 hbuf[11] = rangeShift & 0x00FF;
290 FT_ULong checksum, font_checksum = 0;
292 FT_ULong offset = hlength; /* first table offset */
294 for (FT_UInt i = 0; i < idx; i++)
296 /* here, the buffer length must be a multiple of 4 */
297 FT_ULong len = (lengths[i] + 3) & ~3;
298 unsigned char *buf = new unsigned char[len];
300 buf[len - 1] = 0x00; /* assure padding with zeros */
304 FT_Error error = FT_Load_Sfnt_Table (face, tags[i], 0, buf, NULL);
306 programming_error ("FT_Load_Sfnt_Table (): error.");
311 first pass of computing the font checksum
312 needs checkSumAdjustment = 0
321 unsigned char *endq = buf + len;
322 for (unsigned char *q = buf; q < endq; q += 4)
323 checksum += (q[0] << 24) | (q[1] << 16) | (q[2] << 8) | q[3];
324 font_checksum += checksum;
328 *(p++) = (tags[i] & 0xFF000000UL) >> 24;
329 *(p++) = (tags[i] & 0x00FF0000UL) >> 16;
330 *(p++) = (tags[i] & 0x0000FF00UL) >> 8;
331 *(p++) = tags[i] & 0x000000FFUL;
333 *(p++) = (checksum & 0xFF000000UL) >> 24;
334 *(p++) = (checksum & 0x00FF0000UL) >> 16;
335 *(p++) = (checksum & 0x0000FF00UL) >> 8;
336 *(p++) = checksum & 0x000000FFUL;
338 *(p++) = (offset & 0xFF000000UL) >> 24;
339 *(p++) = (offset & 0x00FF0000UL) >> 16;
340 *(p++) = (offset & 0x0000FF00UL) >> 8;
341 *(p++) = offset & 0x000000FFUL;
343 *(p++) = (lengths[i] & 0xFF000000UL) >> 24;
344 *(p++) = (lengths[i] & 0x00FF0000UL) >> 16;
345 *(p++) = (lengths[i] & 0x0000FF00UL) >> 8;
346 *(p++) = lengths[i] & 0x000000FFUL;
348 /* offset must be a multiple of 4 */
349 offset += (lengths[i] + 3) & ~3;
352 /* add checksum of TTF header */
354 for (unsigned char *q = hbuf; q < p; q += 4)
355 checksum += (q[0] << 24) | (q[1] << 16) | (q[2] << 8) | q[3];
356 font_checksum += checksum;
357 font_checksum = 0xB1B0AFBAUL - font_checksum;
360 see Adobe technical note 5012.Type42_Spec.pdf for details how
361 the /sfnts array must be constructed
363 lily_cookie_fprintf (out, "/sfnts [");
364 t42_write_table (out, face, hbuf, hlength, false,
365 head_length, loca_length);
370 while (FT_Sfnt_Table_Info (face, idx, &tag, &length)
371 != FT_Err_Table_Missing)
373 unsigned char *buf = new unsigned char[length];
374 FT_Error error = FT_Load_Sfnt_Table (face, tag, 0, buf, NULL);
376 programming_error ("FT_Load_Sfnt_Table (): error.");
380 /* in the second pass simply store the computed font checksum */
381 buf[8] = (font_checksum & 0xFF000000UL) >> 24;
382 buf[9] = (font_checksum & 0x00FF0000UL) >> 16;
383 buf[10] = (font_checksum & 0x0000FF00UL) >> 8;
384 buf[11] = font_checksum & 0x000000FFUL;
387 bool is_glyf_table = tag == glyf_tag && length > CHUNKSIZE;
388 t42_write_table (out, face, buf, length, is_glyf_table,
389 head_length, loca_length);
394 lily_cookie_fprintf (out, "\n] def\n");
398 print_trailer (void *out,
401 const int GLYPH_NAME_LEN = 256;
402 char glyph_name[GLYPH_NAME_LEN];
405 = (TT_MaxProfile *)FT_Get_Sfnt_Table (face, ft_sfnt_maxp);
407 lily_cookie_fprintf (out, "/CharStrings %d dict dup begin\n", mp->numGlyphs);
409 Index_to_charcode_map ic_map (make_index_to_charcode_map (face));
411 int output_count = 0;
412 for (int i = 0; i < mp->numGlyphs; i++)
415 if (face->face_flags & FT_FACE_FLAG_GLYPH_NAMES)
417 FT_Error error = FT_Get_Glyph_Name (face, i, glyph_name,
421 programming_error ("FT_Get_Glyph_Name (): error.");
426 if (!glyph_name[0] && ic_map.find (i) != ic_map.end ())
428 FT_ULong ucode = ic_map[i];
429 get_unicode_name (glyph_name, ucode);
433 sprintf (glyph_name, ".notdef");
434 else if (glyph_name == string (".notdef"))
435 glyph_name[0] = '\0';
438 get_glyph_index_name (glyph_name, i);
442 lily_cookie_fprintf (out, "/%s %d def ", glyph_name, i);
446 programming_error (to_string ("no name for glyph %d", i));
448 if (! (output_count % 5))
449 lily_cookie_fprintf (out, "\n");
452 lily_cookie_fprintf (out, "end readonly def\n");
453 lily_cookie_fprintf (out, "FontName currentdict end definefont pop\n");
457 create_type42_font (void *out, string name)
459 FT_Face face = open_ft_face (name);
461 print_header (out, face);
462 print_body (out, face);
463 print_trailer (out, face);
469 LY_DEFINE (ly_ttf_ps_name, "ly:ttf-ps-name",
470 1, 0, 0, (SCM ttf_file_name),
471 "Extract the PostScript name from a TrueType font.")
473 LY_ASSERT_TYPE (scm_is_string, ttf_file_name, 1);
474 string file_name = ly_scm2string (ttf_file_name);
475 if (be_verbose_global)
476 progress_indication ("[" + file_name);
478 FT_Face face = open_ft_face (file_name);
479 char const *ps_name_str0 = FT_Get_Postscript_Name (face);
480 SCM ps_name = scm_from_locale_string (ps_name_str0 ? ps_name_str0 : "");
484 if (be_verbose_global)
485 progress_indication ("]");
492 LY_DEFINE (ly_ttf_2_pfa, "ly:ttf->pfa",
493 1, 0, 0, (SCM ttf_file_name),
494 "Convert the contents of a TTF file to Type42 PFA, returning it as"
497 LY_ASSERT_TYPE (scm_is_string, ttf_file_name, 1);
499 string file_name = ly_scm2string (ttf_file_name);
500 if (be_verbose_global)
501 progress_indication ("[" + file_name);
503 Memory_out_stream stream;
505 create_type42_font (&stream, file_name);
506 SCM asscm = scm_from_locale_stringn (stream.get_string (),
507 stream.get_length ());
509 if (be_verbose_global)
510 progress_indication ("]");