firmware/font.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (c) 2002 by Greg Haerr <greg@censoft.com>
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 /*
  20  * Rockbox startup font initialization
  21  * This file specifies which fonts get compiled-in and
  22  * loaded at startup, as well as their mapping into
  23  * the FONT_SYSFIXED, FONT_UI and FONT_MP3 ids.
  24  */
  25 #include "config.h"
  26
  27 #if defined(HAVE_LCD_BITMAP) || defined(SIMULATOR)
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include "inttypes.h"
  32 #include "lcd.h"
  33 #include "font.h"
  34 #include "file.h"
  35 #include "debug.h"
  36 #include "panic.h"
  37 #include "rbunicode.h"
  38 /* Font cache includes */
  39 #include "font_cache.h"
  40 #include "lru.h"
  41
  42 #ifndef O_BINARY
  43 #define O_BINARY 0
  44 #endif
  45
  46 /* compiled-in font */
  47 extern struct font sysfont;
  48
  49 /* structure filled in by font_load */
  50 static struct font font_ui;
  51
  52 /* system font table, in order of FONT_xxx definition */
  53 static struct font* const sysfonts[MAXFONTS] = { &sysfont, &font_ui };
  54
  55 /* static buffer allocation structures */
  56 static unsigned char mbuf[MAX_FONT_SIZE];
  57 static unsigned char *freeptr = mbuf;
  58 static unsigned char *fileptr;
  59 static unsigned char *eofptr;
  60
  61 /* Font cache structures */
  62 static struct font_cache font_cache_ui;
  63 static int fnt_file = -1;           /* >=0 if font is cached   */
  64 uint32_t file_width_offset;    /* offset to file width data    */
  65 uint32_t file_offset_offset;   /* offset to file offset data   */
  66 static void cache_create(int maxwidth, int height);
  67 static int long_offset = 0;
  68 static int glyph_file;
  69 /* End Font cache structures */
  70
  71 static void glyph_cache_load(void);
  72
  73 void font_init(void)
  74 {
  75     memset(&font_ui, 0, sizeof(struct font));
  76 }
  77
  78 /* Check if we have x bytes left in the file buffer */
  79 #define HAVEBYTES(x) (fileptr + (x) <= eofptr)
  80
  81 /* Helper functions to read big-endian unaligned short or long from
  82    the file buffer.  Bounds-checking must be done in the calling
  83    function.
  84  */
  85
  86 static short readshort(void)
  87 {
  88     unsigned short s;
  89
  90     s = *fileptr++ & 0xff;
  91     s |= (*fileptr++ << 8);
  92     return s;
  93 }
  94
  95 static int32_t readlong(void)
  96 {
  97     uint32_t l;
  98
  99     l = *fileptr++ & 0xff;
 100     l |= *fileptr++ << 8;
 101     l |= ((uint32_t)(*fileptr++)) << 16;
 102     l |= ((uint32_t)(*fileptr++)) << 24;
 103     return l;
 104 }
 105
 106 /* read count bytes*/
 107 static void readstr(char *buf, int count)
 108 {
 109     while (count--)
 110         *buf++ = *fileptr++;
 111 }
 112
 113 void font_reset(void)
 114 {
 115     memset(&font_ui, 0, sizeof(struct font));
 116 }
 117
 118 static struct font*  font_load_header(struct font *pf)
 119 {
 120     char version[4+1];
 121
 122     /* Check we have enough data */
 123     if (!HAVEBYTES(28))
 124         return NULL;
 125
 126     /* read magic and version #*/
 127     memset(version, 0, sizeof(version));
 128     readstr(version, 4);
 129
 130     if (strcmp(version, VERSION) != 0)
 131         return NULL;
 132
 133     /* font info*/
 134     pf->maxwidth = readshort();
 135     pf->height = readshort();
 136     pf->ascent = readshort();
 137     fileptr += 2; /* Skip padding */
 138     pf->firstchar = readlong();
 139     pf->defaultchar = readlong();
 140     pf->size = readlong();
 141
 142     /* get variable font data sizes*/
 143     /* # words of bitmap_t*/
 144     pf->bits_size = readlong();
 145
 146     return pf;
 147 }
 148 /* Load memory font */
 149 static struct font* font_load_in_memory(struct font* pf)
 150 {
 151     int32_t i, noffset, nwidth;
 152
 153     if (!HAVEBYTES(4))
 154         return NULL;
 155
 156     /* # longs of offset*/
 157     noffset = readlong();
 158
 159     /* # bytes of width*/
 160     nwidth = readlong();
 161
 162     /* variable font data*/
 163     pf->bits = (unsigned char *)fileptr;
 164     fileptr += pf->bits_size*sizeof(unsigned char);
 165
 166     if ( pf->bits_size < 0xFFDB )
 167     {
 168         /* pad to 16-bit boundary */
 169         fileptr = (unsigned char *)(((intptr_t)fileptr + 1) & ~1);
 170     }
 171     else
 172     {
 173         /* pad to 32-bit boundary*/
 174         fileptr = (unsigned char *)(((intptr_t)fileptr + 3) & ~3);
 175     }
 176
 177     if (noffset)
 178     {
 179         if ( pf->bits_size < 0xFFDB )
 180         {
 181             long_offset = 0;
 182             pf->offset = (unsigned short *)fileptr;
 183
 184             /* Check we have sufficient buffer */
 185             if (!HAVEBYTES(noffset * sizeof(short)))
 186                 return NULL;
 187
 188             for (i=0; i<noffset; ++i)
 189             {
 190                 ((unsigned short*)(pf->offset))[i] = (unsigned short)readshort();
 191             }
 192         }
 193         else
 194         {
 195             long_offset = 1;
 196             pf->offset = (unsigned short *)fileptr;
 197
 198             /* Check we have sufficient buffer */
 199             if (!HAVEBYTES(noffset * sizeof(int32_t)))
 200                 return NULL;
 201
 202             for (i=0; i<noffset; ++i)
 203             {
 204                 ((uint32_t*)(pf->offset))[i] = (uint32_t)readlong();
 205             }
 206         }
 207     }
 208     else
 209         pf->offset = NULL;
 210
 211     if (nwidth) {
 212         pf->width = (unsigned char *)fileptr;
 213         fileptr += nwidth*sizeof(unsigned char);
 214     }
 215     else
 216         pf->width = NULL;
 217
 218     if (fileptr > eofptr)
 219         return NULL;
 220
 221     return pf;    /* success!*/
 222 }
 223
 224 /* Load cached font */
 225 static struct font* font_load_cached(struct font* pf)
 226 {
 227     uint32_t noffset, nwidth;
 228     unsigned char* oldfileptr = fileptr;
 229
 230     if (!HAVEBYTES(2 * sizeof(int32_t)))
 231         return NULL;
 232
 233     /* # longs of offset*/
 234     noffset = readlong();
 235
 236     /* # bytes of width*/
 237     nwidth = readlong();
 238
 239     /* We are now at the bitmap data, this is fixed at 36.. */
 240     pf->bits = NULL;
 241
 242     /* Calculate offset to offset data */
 243     fileptr += pf->bits_size * sizeof(unsigned char);
 244
 245     if ( pf->bits_size < 0xFFDB )
 246     {
 247         long_offset = 0;
 248         /* pad to 16-bit boundary */
 249         fileptr = (unsigned char *)(((intptr_t)fileptr + 1) & ~1);
 250     }
 251     else
 252     {
 253         long_offset = 1;
 254         /* pad to 32-bit boundary*/
 255         fileptr = (unsigned char *)(((intptr_t)fileptr + 3) & ~3);
 256     }
 257
 258     if (noffset)
 259         file_offset_offset = (uint32_t)(fileptr - freeptr);
 260     else
 261         file_offset_offset = 0;
 262
 263     /* Calculate offset to widths data */
 264     if ( pf->bits_size < 0xFFDB )
 265         fileptr += noffset * sizeof(unsigned short);
 266     else
 267         fileptr += noffset * sizeof(uint32_t);
 268
 269     if (nwidth)
 270         file_width_offset = (uint32_t)(fileptr - freeptr);
 271     else
 272         file_width_offset = 0;
 273
 274     fileptr = oldfileptr;
 275
 276     /* Create the cache */
 277     cache_create(pf->maxwidth, pf->height);
 278
 279     return pf;
 280 }
 281
 282 /* read and load font into incore font structure*/
 283 struct font* font_load(const char *path)
 284 {
 285     int size;
 286     struct font* pf = &font_ui;
 287
 288     /* save loaded glyphs */
 289     glyph_cache_save();
 290
 291     /* Close font file handle */
 292     if (fnt_file >= 0)
 293         close(fnt_file);
 294
 295     /* open and read entire font file*/
 296     fnt_file = open(path, O_RDONLY|O_BINARY);
 297
 298     if (fnt_file < 0) {
 299         DEBUGF("Can't open font: %s\n", path);
 300         return NULL;
 301     }
 302
 303     /* Check file size */
 304     size = filesize(fnt_file);
 305
 306     font_reset();
 307
 308     /* currently, font loading replaces earlier font allocation*/
 309     freeptr = (unsigned char *)(((intptr_t)mbuf + 3) & ~3);
 310     fileptr = freeptr;
 311
 312
 313     if (size > MAX_FONT_SIZE)
 314     {
 315         read(fnt_file, fileptr, FONT_HEADER_SIZE);
 316         eofptr = fileptr + FONT_HEADER_SIZE;
 317
 318         if (!font_load_header(pf))
 319         {
 320             DEBUGF("Failed font header load");
 321             return NULL;
 322         }
 323
 324         if (!font_load_cached(pf))
 325         {
 326             DEBUGF("Failed font cache load");
 327             return NULL;
 328         }
 329
 330         glyph_cache_load();
 331     }
 332     else
 333     {
 334         read(fnt_file, fileptr, MAX_FONT_SIZE);
 335         eofptr = fileptr + size;
 336         close(fnt_file);
 337         fnt_file = -1;
 338
 339         if (!font_load_header(pf))
 340         {
 341             DEBUGF("Failed font header load");
 342             return NULL;
 343         }
 344
 345         if (!font_load_in_memory(pf))
 346         {
 347             DEBUGF("Failed mem load");
 348             return NULL;
 349         }
 350     }
 351
 352     /* no need for multiple font loads currently*/
 353     /*freeptr += filesize;*/
 354     /*freeptr = (unsigned char *)(freeptr + 3) & ~3;*/  /* pad freeptr*/
 355
 356     return pf; /* success!*/
 357 }
 358
 359 /*
 360  * Return a pointer to an incore font structure.
 361  * If the requested font isn't loaded/compiled-in,
 362  * decrement the font number and try again.
 363  */
 364 struct font* font_get(int font)
 365 {
 366     struct font* pf;
 367
 368     if (font >= MAXFONTS)
 369         font = 0;
 370
 371     while (1) {
 372         pf = sysfonts[font];
 373         if (pf && pf->height)
 374             return pf;
 375         if (--font < 0)
 376             panicf("No font!");
 377     }
 378 }
 379 /*
 380  * Returns the stringsize of a given string.
 381  */
 382 int font_getstringsize(const unsigned char *str, int *w, int *h, int fontnumber)
 383 {
 384     struct font* pf = font_get(fontnumber);
 385     unsigned short ch;
 386     int width = 0;
 387
 388     for (str = utf8decode(str, &ch); ch != 0 ; str = utf8decode(str, &ch))
 389     {
 390
 391         /* get proportional width and glyph bits*/
 392         width += font_get_width(pf,ch);
 393     }
 394     if ( w )
 395         *w = width;
 396     if ( h )
 397         *h = pf->height;
 398     return width;
 399 }
 400
 401 /*
 402  * Reads an entry into cache entry
 403  */
 404 static void
 405 load_cache_entry(struct font_cache_entry* p, void* callback_data)
 406 {
 407     struct font* pf = callback_data;
 408     unsigned short char_code = p->_char_code;
 409     unsigned char tmp[2];
 410
 411     if (file_width_offset)
 412     {
 413         int width_offset = file_width_offset + char_code;
 414         lseek(fnt_file, width_offset, SEEK_SET);
 415         read(fnt_file, &(p->width), 1);
 416     }
 417     else
 418     {
 419         p->width = pf->maxwidth;
 420     }
 421
 422     int32_t bitmap_offset = 0;
 423
 424     if (file_offset_offset)
 425     {
 426         int32_t offset = file_offset_offset + char_code * (long_offset ? sizeof(int32_t) : sizeof(short));
 427         lseek(fnt_file, offset, SEEK_SET);
 428         read (fnt_file, tmp, 2);
 429         bitmap_offset = tmp[0] | (tmp[1] << 8);
 430         if (long_offset) {
 431             read (fnt_file, tmp, 2);
 432             bitmap_offset |= (tmp[0] << 16) | (tmp[1] << 24);
 433         }
 434     }
 435     else
 436     {
 437         bitmap_offset = ((pf->height + 7) / 8) * p->width * char_code;
 438     }
 439
 440     int32_t file_offset = FONT_HEADER_SIZE + bitmap_offset;
 441     lseek(fnt_file, file_offset, SEEK_SET);
 442
 443     int src_bytes = p->width * ((pf->height + 7) / 8);
 444     read(fnt_file, p->bitmap, src_bytes);
 445 }
 446
 447 /*
 448  * Converts cbuf into a font cache
 449  */
 450 static void cache_create(int maxwidth, int height)
 451 {
 452     /* maximum size of rotated bitmap */
 453     int bitmap_size = maxwidth * ((height + 7) / 8);
 454
 455     /* Initialise cache */
 456     font_cache_create(&font_cache_ui, mbuf, MAX_FONT_SIZE, bitmap_size);
 457 }
 458
 459 /*
 460  * Returns width of character
 461  */
 462 int font_get_width(struct font* pf, unsigned short char_code)
 463 {
 464     /* check input range*/
 465     if (char_code < pf->firstchar || char_code >= pf->firstchar+pf->size)
 466         char_code = pf->defaultchar;
 467     char_code -= pf->firstchar;
 468
 469     return (fnt_file >= 0 && pf != &sysfont)?
 470         font_cache_get(&font_cache_ui,char_code,load_cache_entry,pf)->width:
 471         pf->width? pf->width[char_code]: pf->maxwidth;
 472 }
 473
 474 const unsigned char* font_get_bits(struct font* pf, unsigned short char_code)
 475 {
 476     const unsigned char* bits;
 477
 478     /* check input range*/
 479     if (char_code < pf->firstchar || char_code >= pf->firstchar+pf->size)
 480         char_code = pf->defaultchar;
 481     char_code -= pf->firstchar;
 482
 483     if (fnt_file >= 0 && pf != &sysfont)
 484     {
 485         bits =
 486             (unsigned char*)font_cache_get(&font_cache_ui,char_code,load_cache_entry,pf)->bitmap;
 487     }
 488     else
 489     {
 490         bits = pf->bits + (pf->offset?
 491             pf->offset[char_code]:
 492             (((pf->height + 7) / 8) * pf->maxwidth * char_code));
 493     }
 494
 495     return bits;
 496 }
 497
 498 static void glyph_file_write(void* data)
 499 {
 500     struct font_cache_entry* p = data;
 501     struct font* pf = &font_ui;
 502     unsigned short ch;
 503     unsigned char tmp[2];
 504
 505     ch = p->_char_code + pf->firstchar;
 506
 507     if (ch != 0xffff && glyph_file >= 0) {
 508         tmp[0] = ch >> 8;
 509         tmp[1] = ch & 0xff;
 510         if (write(glyph_file, tmp, 2) != 2) {
 511             close(glyph_file);
 512             glyph_file = -1;
 513         }
 514     }
 515     return;
 516 }
 517
 518 /* save the char codes of the loaded glyphs to a file */
 519 void glyph_cache_save(void)
 520 {
 521
 522     if (fnt_file >= 0) {
 523
 524         glyph_file = creat(GLYPH_CACHE_FILE);
 525
 526         if (glyph_file < 0) return;
 527
 528         lru_traverse(&font_cache_ui._lru, glyph_file_write);
 529
 530         if (glyph_file >= 0)
 531             close(glyph_file);
 532     }
 533     return;
 534 }
 535
 536 static void glyph_cache_load(void)
 537 {
 538     if (fnt_file >= 0) {
 539
 540         int fd;
 541         unsigned char tmp[2];
 542         unsigned short ch;
 543         struct font* pf = &font_ui;
 544
 545         fd = open(GLYPH_CACHE_FILE, O_RDONLY|O_BINARY);
 546
 547         if (fd >= 0) {
 548
 549             while (read(fd, tmp, 2) == 2) {
 550                 ch = (tmp[0] << 8) | tmp[1];
 551                 font_get_bits(pf, ch);
 552             }
 553
 554             close(fd);
 555         } else {
 556             /* load latin1 chars into cache */
 557             ch = 256;
 558             while (ch-- > 32)
 559                 font_get_bits(pf, ch);
 560         }
 561     }
 562     return;
 563 }
 564
 565 #endif /* HAVE_LCD_BITMAP */
 566
 567 /* -----------------------------------------------------------------
 568  * vim: et sw=4 ts=8 sts=4 tw=78
 569  */