2 * Copyright (C) 2000, Matias Atria
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * Type1 font support for MDVI
22 * We use T1lib only as a rasterizer, not to draw glyphs.
28 #ifdef WITH_TYPE1_FONTS
34 static int t1lib_initialized = 0;
36 typedef struct t1info {
39 char *fontname; /* (short) name of this font */
40 int t1id; /* T1lib's id for this font */
41 int hasmetrics; /* have we processed this font? */
42 TFMInfo *tfminfo; /* TFM data is shared */
43 DviFontMapInfo mapinfo;
44 DviEncoding *encoding;
47 static void t1_font_remove __PROTO((T1Info *));
48 static int t1_load_font __PROTO((DviParams *, DviFont *));
49 static int t1_font_get_glyph __PROTO((DviParams *, DviFont *, int));
50 static void t1_font_shrink_glyph
51 __PROTO((DviContext *, DviFont *, DviFontChar *, DviGlyph *));
52 static void t1_free_data __PROTO((DviFont *));
53 static void t1_reset_font __PROTO((DviFont *));
54 static char *t1_lookup_font __PROTO((const char *, Ushort *, Ushort *));
56 /* only symbol exported by this file */
57 DviFontInfo t1_font_info = {
59 1, /* scaling supported by format */
63 mdvi_shrink_glyph_grey,
66 t1_lookup_font, /* lookup */
71 /* this seems good enough for most DVI files */
72 #define T1_HASH_SIZE 31
74 /* If these parameters change, we must delete all size information
75 * in all fonts, and reset the device resolutions in T1lib */
76 static int t1lib_xdpi = -1;
77 static int t1lib_ydpi = -1;
79 static ListHead t1fonts = {NULL, NULL, 0};
80 static DviHashTable t1hash;
82 /* Type1 fonts need their own `lookup' function. Here is how it works:
83 * First we try to find the font by its given name. If that fails, we
84 * query the font maps. A typical font map entry may contain the line
86 * ptmr8rn Times-Roman ".82 ExtendFont TeXBase1Encoding ReEncodeFont" <8r.enc <ptmr
88 * which means: If you're looking for the font `ptmr8rn' load `Times-Roman'
89 * which is in `ptmr' instead, and extend it by 0.82 points, then reencode
90 * it with the vector TeXBase1Encoding from the file `8r.enc'. This will
91 * fail if the entry looks like this:
93 * ptmr8rn Times-Roman ".82 ExtendFont TeXBase1Encoding ReEncodeFont" <8r.enc
95 * because to deal with this we would need to be able to locate the font file
96 * for the `Times-Roman' font ourselves, and that's beyond the scope of mdvi.
97 * But hey, we tried hard.
99 char *t1_lookup_font(const char *name, Ushort *hdpi, Ushort *vdpi)
106 DEBUG((DBG_TYPE1, "(t1) looking for `%s'\n", name));
108 /* first let's try the font we were asked for */
109 filename = kpse_find_file(name, kpse_type1_format, 1);
110 if(filename != NULL) {
115 DEBUG((DBG_TYPE1, "(t1) %s: not found, querying font maps\n", name));
116 /* now query the fontmap */
117 if(mdvi_query_fontmap(&info, name) < 0) {
118 /* it's not there either */
122 /* check what we got */
124 DEBUG((DBG_TYPE1, "(t1) %s: found `%s' (cached)\n",
125 name, info.fullfile));
126 /* this is a cached lookup */
127 return mdvi_strdup(info.fullfile);
130 /* no file associated to this font? */
131 if(info.fontfile == NULL)
132 return info.psname ? mdvi_ps_find_font(info.psname) : NULL;
134 /* let's extract the extension */
135 ext = file_extension(info.fontfile);
136 if(ext && !STREQ(ext, "pfa") && !STREQ(ext, "pfb")) {
138 "(t1) %s: associated name `%s' is not Type1\n",
139 name, info.fontfile));
140 /* it's not a Type1 font */
144 /* get the `base' name */
146 newname = mdvi_strdup(name);
147 newname[ext - info.fontfile - 1] = 0;
149 newname = (char *)name; /* we don't modify this */
152 DEBUG((DBG_TYPE1, "(t1) looking for `%s' on behalf of `%s'\n",
154 filename = kpse_find_file(newname, kpse_type1_format, 1);
156 /* we don't need this anymore */
159 if(filename == NULL) {
160 DEBUG((DBG_TYPE1, "(t1) %s: not found\n", name));
164 DEBUG((DBG_TYPE1, "(t1) %s: found as `%s'\n", name, filename));
165 /* got it! let's remember this */
166 mdvi_add_fontmap_file(name, filename);
170 static void t1_reset_resolution(int xdpi, int ydpi)
175 DEBUG((DBG_TYPE1, "(t1) resetting device resolution (current: (%d,%d))\n",
176 t1lib_xdpi, t1lib_ydpi));
177 #if T1LIB_VERSION < 5
178 nfonts = T1_Get_no_fonts();
180 nfonts = T1_GetNoFonts();
183 for(i = 0; i < nfonts; i++)
184 T1_DeleteAllSizes(i);
185 /* reset device resolutions */
186 if(T1_SetDeviceResolutions((float)xdpi, (float)ydpi) < 0)
187 mdvi_warning(_("(t1) failed to reset device resolution\n"));
190 "(t1) reset successful, new resolution is (%d, %d)\n",
196 static void t1_reset_font(DviFont *font)
198 T1Info *info = (T1Info *)font->private;
202 DEBUG((DBG_FONTS, "(t1) resetting font `%s'\n", font->fontname));
203 /* just mark the font as not having metric info. It will be reset
204 * automatically later */
205 info->hasmetrics = 0;
208 static void t1_transform_font(T1Info *info)
210 if(!info->hasmetrics && info->encoding != NULL) {
211 DEBUG((DBG_TYPE1, "(t1) %s: encoding with vector `%s'\n",
212 info->fontname, info->encoding->name));
213 T1_DeleteAllSizes(info->t1id);
214 if(T1_ReencodeFont(info->t1id, info->encoding->vector) < 0)
215 mdvi_warning(_("%s: could not encode font\n"), info->fontname);
217 if(info->mapinfo.slant) {
218 DEBUG((DBG_TYPE1, "(t1) %s: slanting by %.3f\n",
220 MDVI_FMAP_SLANT(&info->mapinfo)));
221 T1_SlantFont(info->t1id,
222 MDVI_FMAP_SLANT(&info->mapinfo));
224 if(info->mapinfo.extend) {
225 DEBUG((DBG_TYPE1, "(t1) %s: extending by %.3f\n",
227 MDVI_FMAP_EXTEND(&info->mapinfo)));
228 T1_ExtendFont(info->t1id,
229 MDVI_FMAP_EXTEND(&info->mapinfo));
233 /* if this function is called, we really need this font */
234 static int t1_really_load_font(DviParams *params, DviFont *font, T1Info *info)
242 DEBUG((DBG_TYPE1, "(t1) really_load_font(%s)\n", info->fontname));
244 /* if the parameters changed, reset T1lib */
245 if(t1lib_xdpi != params->dpi || t1lib_ydpi != params->vdpi)
246 t1_reset_resolution(params->dpi, params->vdpi);
248 /* if we already have a T1lib id, do nothing */
249 if(info->t1id != -1) {
250 info->hasmetrics = 1;
251 /* apply slant and extend again */
252 t1_transform_font(info);
256 /* before we even attempt to load the font, make sure we have metric
258 info->tfminfo = mdvi_ps_get_metrics(info->fontname);
259 if(info->tfminfo == NULL) {
261 "(t1) %s: no metric data, font ignored\n",
266 font->design = info->tfminfo->design;
268 /* check if we have a font with this name (maybe at a different size) */
269 old = (T1Info *)mdvi_hash_lookup(&t1hash, (unsigned char *)info->fontname);
271 /* let's avoid confusion */
274 if(old && old->t1id != -1) {
275 /* let's take advantage of T1lib's font sharing */
276 t1id = T1_CopyFont(old->t1id);
277 DEBUG((DBG_TYPE1, "(t1) %s -> %d (CopyFont)\n",
278 info->fontname, t1id));
281 t1id = T1_AddFont(font->filename);
282 DEBUG((DBG_TYPE1, "(t1) %s -> %d (AddFont)\n",
283 info->fontname, t1id));
291 * a minor optimization: If the old font in the hash table has
292 * not been loaded yet, replace it by this one, so we can use
295 if(old && old->t1id == -1) {
296 DEBUG((DBG_TYPE1, "(t1) font `%s' exchanged in hash table\n",
298 mdvi_hash_remove(&t1hash, (unsigned char *)old->fontname);
299 mdvi_hash_add(&t1hash, (unsigned char *)info->fontname,
300 info, MDVI_HASH_UNCHECKED);
303 /* now let T1lib load it */
304 if(!copied && T1_LoadFont(info->t1id) < 0) {
305 DEBUG((DBG_TYPE1, "(t1) T1_LoadFont(%d) failed with error %d\n",
306 info->t1id, T1_errno));
309 DEBUG((DBG_TYPE1, "(t1) T1_LoadFont(%d) -> Ok\n", info->t1id));
311 /* get information from the fontmap */
312 status = mdvi_query_fontmap(&info->mapinfo, info->fontname);
313 if(!status && info->mapinfo.encoding)
314 info->encoding = mdvi_request_encoding(info->mapinfo.encoding);
315 t1_transform_font(info);
317 i = info->tfminfo->hic - info->tfminfo->loc + 1;
318 if(i != font->hic - font->loc + 1) {
319 /* reset to optimal size */
320 font->chars = mdvi_realloc(font->chars, i * sizeof(DviFontChar));
323 /* get the scaled characters metrics */
324 get_tfm_chars(params, font, info->tfminfo, 0);
325 info->hasmetrics = 1;
327 DEBUG((DBG_TYPE1, "(t1) font `%s' really-loaded\n", info->fontname));
331 /* some error does not allows us to use this font. We need to reset
332 * the font structure, so the font system can try to read this
333 * font in a different class */
335 /* first destroy the private data */
336 t1_font_remove(info);
337 /* now reset all chars -- this is the important part */
338 mdvi_free(font->chars);
340 font->loc = font->hic = 0;
344 static int init_t1lib(DviParams *params)
348 #ifdef WORD_LITTLE_ENDIAN
349 /* try making T1lib use bitmaps in our format, but if this
350 * fails we'll convert the bitmap ourselves */
351 T1_SetBitmapPad(BITMAP_BITS);
353 T1_SetDeviceResolutions((float)params->dpi, (float)params->vdpi);
354 t1flags = IGNORE_CONFIGFILE|IGNORE_FONTDATABASE|T1_NO_AFM;
357 if(T1_InitLib(t1flags) == NULL)
358 return (t1lib_initialized = -1);
359 if(DEBUGGING(TYPE1)) {
360 DEBUG((DBG_TYPE1, "T1lib debugging output saved in t1lib.log\n"));
361 T1_SetLogLevel(T1LOG_DEBUG);
363 /* initialize our hash table, but don't allocate memory for it
365 mdvi_hash_init(&t1hash);
366 DEBUG((DBG_TYPE1, "(t1) t1lib %s initialized -- resolution is (%d, %d), pad is %d bits\n",
367 T1_GetLibIdent(), params->dpi, params->vdpi, T1_GetBitmapPad()));
368 t1lib_initialized = 1;
369 t1lib_xdpi = params->dpi;
370 t1lib_ydpi = params->vdpi;
374 static int t1_load_font(DviParams *params, DviFont *font)
379 if(t1lib_initialized < 0)
381 else if(t1lib_initialized == 0 && init_t1lib(params) < 0)
384 if(font->in != NULL) {
385 /* we don't need this */
390 info = xalloc(T1Info);
393 * mark the font as `unregistered' with T1lib. It will
394 * be added when we actually use it
398 /* add the font to our list */
399 info->fontname = font->fontname;
400 info->hasmetrics = 0;
401 info->encoding = NULL;
402 info->mapinfo.psname = NULL;
403 info->mapinfo.encoding = NULL;
404 info->mapinfo.fontfile = NULL;
405 info->mapinfo.extend = 0;
406 info->mapinfo.slant = 0;
407 info->encoding = NULL;
409 /* create the hash table if we have not done so yet */
410 if(t1hash.nbucks == 0)
411 mdvi_hash_create(&t1hash, T1_HASH_SIZE);
412 mdvi_hash_add(&t1hash, (unsigned char *) info->fontname, info, MDVI_HASH_UNIQUE);
413 listh_append(&t1fonts, LIST(info));
415 font->private = info;
417 /* reset everything */
418 font->chars = xnalloc(DviFontChar, 256);
421 for(i = 0; i < 256; i++) {
422 font->chars[i].code = i;
423 font->chars[i].offset = 1;
424 font->chars[i].loaded = 0;
425 font->chars[i].glyph.data = NULL;
426 font->chars[i].shrunk.data = NULL;
427 font->chars[i].grey.data = NULL;
433 #define GLYPH_WIDTH(g) \
434 ((g)->metrics.rightSideBearing - (g)->metrics.leftSideBearing)
435 #define GLYPH_HEIGHT(g) \
436 ((g)->metrics.ascent - (g)->metrics.descent)
438 static inline BITMAP *t1_glyph_bitmap(GLYPH *glyph)
442 w = GLYPH_WIDTH(glyph);
443 h = GLYPH_HEIGHT(glyph);
446 return MDVI_GLYPH_EMPTY;
448 pad = T1_GetBitmapPad();
449 return bitmap_convert_lsb8((unsigned char *)glyph->bits, w, h, ROUND(w, pad) * (pad >> 3));
452 static void t1_font_shrink_glyph(DviContext *dvi, DviFont *font, DviFontChar *ch, DviGlyph *dest)
459 info = (T1Info *)font->private;
460 ASSERT(info != NULL);
462 DEBUG((DBG_TYPE1, "(t1) shrinking glyph for character %d in `%s' (%d,%d)\n",
463 ch->code, font->fontname, ch->width, ch->height));
464 size = (double)font->scale / (dvi->params.tfm_conv * 0x100000);
465 size = 72.0 * size / 72.27;
466 matrix.cxx = 1.0/(double)dvi->params.hshrink;
467 matrix.cyy = 1.0/(double)dvi->params.vshrink;
470 glyph = T1_SetChar(info->t1id, ch->code, (float)size, &matrix);
472 dest->data = t1_glyph_bitmap(glyph);
473 dest->x = -glyph->metrics.leftSideBearing;
474 dest->y = glyph->metrics.ascent;
475 dest->w = GLYPH_WIDTH(glyph);
476 dest->h = GLYPH_HEIGHT(glyph);
479 if(DEBUGGING(BITMAP_DATA)) {
480 DEBUG((DBG_BITMAP_DATA,
481 "(t1) %s: t1_shrink_glyph(%d): (%dw,%dh,%dx,%dy) -> (%dw,%dh,%dx,%dy)\n",
482 ch->glyph.w, ch->glyph.h, ch->glyph.x, ch->glyph.y,
483 dest->w, dest->h, dest->x, dest->y));
484 bitmap_print(stderr, (BITMAP *)dest->data);
487 /* transform the glyph - we could do this with t1lib, but we do
488 * it ourselves for now */
489 font_transform_glyph(dvi->params.orientation, dest);
492 static int t1_font_get_glyph(DviParams *params, DviFont *font, int code)
494 T1Info *info = (T1Info *)font->private;
501 ASSERT(info != NULL);
502 if(!info->hasmetrics && t1_really_load_font(params, font, info) < 0)
504 ch = FONTCHAR(font, code);
505 if(!ch || !glyph_present(ch))
508 if(!ch->width || !ch->height) {
511 ch->glyph.w = ch->width;
512 ch->glyph.h = ch->height;
513 ch->glyph.data = NULL;
517 /* load the glyph with T1lib (this is done only once for each glyph) */
519 /* get size in TeX points (tfm_conv includes dpi and magnification) */
520 size = (double)font->scale / (params->tfm_conv * 0x100000);
521 /* and transform into PostScript points */
522 size = 72.0 * size / 72.27;
524 dpi = Max(font->hdpi, font->vdpi);
525 /* we don't want the glyph to be cached twice (once by us, another by
526 * T1lib), so we use an identity matrix to tell T1lib not to keep the
528 matrix.cxx = (double)font->hdpi / dpi;
529 matrix.cyy = (double)font->vdpi / dpi;
530 matrix.cxy = matrix.cyx = 0.0;
531 glyph = T1_SetChar(info->t1id, ch->code, (float)size, &matrix);
535 ch->glyph.w = ch->width;
536 ch->glyph.h = ch->height;
537 ch->glyph.data = NULL;
541 /* and make it a bitmap */
542 ch->glyph.data = t1_glyph_bitmap(glyph);
543 ch->glyph.x = -glyph->metrics.leftSideBearing;
544 ch->glyph.y = glyph->metrics.ascent;
545 ch->glyph.w = GLYPH_WIDTH(glyph);
546 ch->glyph.h = GLYPH_HEIGHT(glyph);
548 /* let's also fix the glyph's origin
549 * (which is not contained in the TFM) */
552 /* let's fix these too */
553 ch->width = ch->glyph.w;
554 ch->height = ch->glyph.h;
559 static void t1_font_remove(T1Info *info)
563 /* first remove it from our list */
564 listh_remove(&t1fonts, LIST(info));
566 /* it it's in the hash table, we may need to replace this by another font */
567 old = (T1Info *)mdvi_hash_lookup(&t1hash, (unsigned char *)info->fontname);
569 mdvi_hash_remove(&t1hash, (unsigned char *) info->fontname);
570 /* go through the list and see if there is another
571 * font with this name */
572 for(old = (T1Info *)t1fonts.head; old; old = old->next)
573 if(STREQ(old->fontname, info->fontname))
576 mdvi_hash_add(&t1hash, (unsigned char *) old->fontname, old,
577 MDVI_HASH_UNCHECKED);
579 /* release our encoding vector */
581 DEBUG((DBG_TYPE1, "(t1) %s: releasing vector `%s'\n",
582 info->fontname, info->encoding->name));
583 mdvi_release_encoding(info->encoding, 1);
586 /* now get rid of it */
587 if(info->t1id != -1) {
588 DEBUG((DBG_TYPE1, "(t1) %s: T1_DeleteFont(%d)\n",
589 info->fontname, info->t1id));
590 T1_DeleteFont(info->t1id);
592 DEBUG((DBG_TYPE1, "(t1) %s: not loaded yet, DeleteFont skipped\n",
596 free_font_metrics(info->tfminfo);
597 /*mdvi_free(info->fontname);*/
601 static void t1_free_data(DviFont *font)
603 /* called after all the glyphs are destroyed */
605 if(font->private == NULL) {
606 /* this is perfectly normal, it just means the font has
607 * not been requested by MDVI yet */
611 /* destroy this data */
613 t1_font_remove((T1Info *)font->private);
614 font->private = NULL;
617 * if this is the last T1 font, reset the T1 library
618 * It is important that we do this, because this is will be called
619 * when the resolution or the magnification changes.
621 if(t1fonts.count == 0) {
622 DEBUG((DBG_TYPE1, "(t1) last font removed -- closing T1lib\n"));
624 t1lib_initialized = 0;
630 #endif /* WITH_TYPE1_FONTS */