src/fclist.c

   1 /*
   2  * $RCSId: xc/lib/fontconfig/src/fclist.c,v 1.11tsi Exp $
   3  *
   4  * Copyright © 2000 Keith Packard
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and its
   7  * documentation for any purpose is hereby granted without fee, provided that
   8  * the above copyright notice appear in all copies and that both that
   9  * copyright notice and this permission notice appear in supporting
  10  * documentation, and that the name of Keith Packard not be used in
  11  * advertising or publicity pertaining to distribution of the software without
  12  * specific, written prior permission.  Keith Packard makes no
  13  * representations about the suitability of this software for any purpose.  It
  14  * is provided "as is" without express or implied warranty.
  15  *
  16  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  18  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  22  * PERFORMANCE OF THIS SOFTWARE.
  23  */
  24
  25 #include <stdlib.h>
  26 #include "fcint.h"
  27
  28 FcObjectSet *
  29 FcObjectSetCreate (void)
  30 {
  31     FcObjectSet    *os;
  32
  33     os = (FcObjectSet *) malloc (sizeof (FcObjectSet));
  34     if (!os)
  35         return 0;
  36     FcMemAlloc (FC_MEM_OBJECTSET, sizeof (FcObjectSet));
  37     os->nobject = 0;
  38     os->sobject = 0;
  39     os->objects = 0;
  40     return os;
  41 }
  42
  43 FcBool
  44 FcObjectSetAdd (FcObjectSet *os, const char *object)
  45 {
  46     int         s;
  47     const char  **objects;
  48     int         high, low, mid, c;
  49
  50     if (os->nobject == os->sobject)
  51     {
  52         s = os->sobject + 4;
  53         if (os->objects)
  54             objects = (const char **) realloc ((void *) os->objects,
  55                                                s * sizeof (const char *));
  56         else
  57             objects = (const char **) malloc (s * sizeof (const char *));
  58         if (!objects)
  59             return FcFalse;
  60         if (os->sobject)
  61             FcMemFree (FC_MEM_OBJECTPTR, os->sobject * sizeof (const char *));
  62         FcMemAlloc (FC_MEM_OBJECTPTR, s * sizeof (const char *));
  63         os->objects = objects;
  64         os->sobject = s;
  65     }
  66     high = os->nobject - 1;
  67     low = 0;
  68     mid = 0;
  69     c = 1;
  70     while (low <= high)
  71     {
  72         mid = (low + high) >> 1;
  73         c = strcmp (os->objects[mid], object);
  74         if (c == 0)
  75             return FcTrue;
  76         if (c < 0)
  77             low = mid + 1;
  78         else
  79             high = mid - 1;
  80     }
  81     if (c < 0)
  82         mid++;
  83     memmove (os->objects + mid + 1, os->objects + mid,
  84              (os->nobject - mid) * sizeof (const char *));
  85     os->objects[mid] = FcObjectStaticName (object);
  86     os->nobject++;
  87     return FcTrue;
  88 }
  89
  90 void
  91 FcObjectSetDestroy (FcObjectSet *os)
  92 {
  93     if (os->objects)
  94     {
  95         FcMemFree (FC_MEM_OBJECTPTR, os->sobject * sizeof (const char *));
  96         free ((void *) os->objects);
  97     }
  98     FcMemFree (FC_MEM_OBJECTSET, sizeof (FcObjectSet));
  99     free (os);
 100 }
 101
 102 FcObjectSet *
 103 FcObjectSetVaBuild (const char *first, va_list va)
 104 {
 105     FcObjectSet    *ret;
 106
 107     FcObjectSetVapBuild (ret, first, va);
 108     return ret;
 109 }
 110
 111 FcObjectSet *
 112 FcObjectSetBuild (const char *first, ...)
 113 {
 114     va_list         va;
 115     FcObjectSet    *os;
 116
 117     va_start (va, first);
 118     FcObjectSetVapBuild (os, first, va);
 119     va_end (va);
 120     return os;
 121 }
 122
 123 /*
 124  * Font must have a containing value for every value in the pattern
 125  */
 126 static FcBool
 127 FcListValueListMatchAny (FcValueList *patOrig,      /* pattern */
 128                          FcValueList *fntOrig)      /* font */
 129 {
 130     FcValueList     *pat, *fnt;
 131
 132     for (pat = patOrig; pat; pat = pat->next)
 133     {
 134         for (fnt = fntOrig; fnt; fnt = fnt->next)
 135         {
 136             /*
 137              * make sure the font 'contains' the pattern.
 138              * (OpListing is OpContains except for strings
 139              *  where it requires an exact match)
 140              */
 141             if (FcConfigCompareValue (fnt->value,
 142                                       FcOpListing,
 143                                       pat->value))
 144                 break;
 145         }
 146         if (!fnt)
 147             return FcFalse;
 148     }
 149     return FcTrue;
 150 }
 151
 152 static FcBool
 153 FcListValueListEqual (FcValueList   *v1orig,
 154                       FcValueList   *v2orig)
 155 {
 156     FcValueList     *v1, *v2;
 157
 158     for (v1 = v1orig; v1; v1 = v1->next)
 159     {
 160         for (v2 = v2orig; v2; v2 = v2->next)
 161             if (FcValueEqual (v1->value, v2->value))
 162                 break;
 163         if (!v2)
 164             return FcFalse;
 165     }
 166     for (v2 = v2orig; v2; v2 = v2->next)
 167     {
 168         for (v1 = v1orig; v1; v1 = v1->next)
 169             if (FcValueEqual (v1->value, v2->value))
 170                 break;
 171         if (!v1)
 172             return FcFalse;
 173     }
 174     return FcTrue;
 175 }
 176
 177 static FcBool
 178 FcListPatternEqual (FcPattern   *p1,
 179                     FcPattern   *p2,
 180                     FcObjectSet *os)
 181 {
 182     int             i;
 183     FcPatternElt    *e1, *e2;
 184
 185     for (i = 0; i < os->nobject; i++)
 186     {
 187         e1 = FcPatternFindElt (p1, os->objects[i]);
 188         e2 = FcPatternFindElt (p2, os->objects[i]);
 189         if (!e1 && !e2)
 190             continue;
 191         if (!e1 || !e2)
 192             return FcFalse;
 193         if (!FcListValueListEqual (e1->values, e2->values))
 194             return FcFalse;
 195     }
 196     return FcTrue;
 197 }
 198
 199 /*
 200  * FcTrue iff all objects in "p" match "font"
 201  */
 202
 203 FcBool
 204 FcListPatternMatchAny (const FcPattern *p,
 205                        const FcPattern *font)
 206 {
 207     int             i;
 208     FcPatternElt   *e;
 209
 210     for (i = 0; i < p->num; i++)
 211     {
 212         e = FcPatternFindElt (font, p->elts[i].object);
 213         if (!e)
 214             return FcFalse;
 215         if (!FcListValueListMatchAny (p->elts[i].values,    /* pat elts */
 216                                       e->values))           /* font elts */
 217             return FcFalse;
 218     }
 219     return FcTrue;
 220 }
 221
 222 static FcChar32
 223 FcListMatrixHash (const FcMatrix *m)
 224 {
 225     int     xx = (int) (m->xx * 100),
 226             xy = (int) (m->xy * 100),
 227             yx = (int) (m->yx * 100),
 228             yy = (int) (m->yy * 100);
 229
 230     return ((FcChar32) xx) ^ ((FcChar32) xy) ^ ((FcChar32) yx) ^ ((FcChar32) yy);
 231 }
 232
 233 static FcChar32
 234 FcListValueHash (FcValue    v)
 235 {
 236     switch (v.type) {
 237     case FcTypeVoid:
 238         return 0;
 239     case FcTypeInteger:
 240         return (FcChar32) v.u.i;
 241     case FcTypeDouble:
 242         return (FcChar32) (int) v.u.d;
 243     case FcTypeString:
 244         return FcStrHashIgnoreCase (v.u.s);
 245     case FcTypeBool:
 246         return (FcChar32) v.u.b;
 247     case FcTypeMatrix:
 248         return FcListMatrixHash (v.u.m);
 249     case FcTypeCharSet:
 250         return FcCharSetCount (v.u.c);
 251     case FcTypeFTFace:
 252         return (long) v.u.f;
 253     case FcTypeLangSet:
 254         return FcLangSetHash (v.u.l);
 255     }
 256     return 0;
 257 }
 258
 259 static FcChar32
 260 FcListValueListHash (FcValueList    *list)
 261 {
 262     FcChar32    h = 0;
 263
 264     while (list)
 265     {
 266         h = h ^ FcListValueHash (list->value);
 267         list = list->next;
 268     }
 269     return h;
 270 }
 271
 272 static FcChar32
 273 FcListPatternHash (FcPattern    *font,
 274                    FcObjectSet  *os)
 275 {
 276     int             n;
 277     FcPatternElt    *e;
 278     FcChar32        h = 0;
 279
 280     for (n = 0; n < os->nobject; n++)
 281     {
 282         e = FcPatternFindElt (font, os->objects[n]);
 283         if (e)
 284             h = h ^ FcListValueListHash (e->values);
 285     }
 286     return h;
 287 }
 288
 289 typedef struct _FcListBucket {
 290     struct _FcListBucket    *next;
 291     FcChar32                hash;
 292     FcPattern               *pattern;
 293 } FcListBucket;
 294
 295 #define FC_LIST_HASH_SIZE   4099
 296
 297 typedef struct _FcListHashTable {
 298     int             entries;
 299     FcListBucket    *buckets[FC_LIST_HASH_SIZE];
 300 } FcListHashTable;
 301
 302 static void
 303 FcListHashTableInit (FcListHashTable *table)
 304 {
 305     table->entries = 0;
 306     memset (table->buckets, '\0', sizeof (table->buckets));
 307 }
 308
 309 static void
 310 FcListHashTableCleanup (FcListHashTable *table)
 311 {
 312     int i;
 313     FcListBucket    *bucket, *next;
 314
 315     for (i = 0; i < FC_LIST_HASH_SIZE; i++)
 316     {
 317         for (bucket = table->buckets[i]; bucket; bucket = next)
 318         {
 319             next = bucket->next;
 320             FcPatternDestroy (bucket->pattern);
 321             FcMemFree (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 322             free (bucket);
 323         }
 324         table->buckets[i] = 0;
 325     }
 326     table->entries = 0;
 327 }
 328
 329 static FcBool
 330 FcListAppend (FcListHashTable   *table,
 331               FcPattern         *font,
 332               FcObjectSet       *os)
 333 {
 334     int             o;
 335     FcPatternElt    *e;
 336     FcValueList     *v;
 337     FcChar32        hash;
 338     FcListBucket    **prev, *bucket;
 339
 340     hash = FcListPatternHash (font, os);
 341     for (prev = &table->buckets[hash % FC_LIST_HASH_SIZE];
 342          (bucket = *prev); prev = &(bucket->next))
 343     {
 344         if (bucket->hash == hash &&
 345             FcListPatternEqual (bucket->pattern, font, os))
 346             return FcTrue;
 347     }
 348     bucket = (FcListBucket *) malloc (sizeof (FcListBucket));
 349     if (!bucket)
 350         goto bail0;
 351     FcMemAlloc (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 352     bucket->next = 0;
 353     bucket->hash = hash;
 354     bucket->pattern = FcPatternCreate ();
 355     if (!bucket->pattern)
 356         goto bail1;
 357
 358     for (o = 0; o < os->nobject; o++)
 359     {
 360         e = FcPatternFindElt (font, os->objects[o]);
 361         if (e)
 362         {
 363             for (v = e->values; v; v = v->next)
 364             {
 365                 if (!FcPatternAdd (bucket->pattern,
 366                                    os->objects[o],
 367                                    v->value, FcTrue))
 368                     goto bail2;
 369             }
 370         }
 371     }
 372     *prev = bucket;
 373     ++table->entries;
 374
 375     return FcTrue;
 376
 377 bail2:
 378     FcPatternDestroy (bucket->pattern);
 379 bail1:
 380     FcMemFree (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 381     free (bucket);
 382 bail0:
 383     return FcFalse;
 384 }
 385
 386 FcFontSet *
 387 FcFontSetList (FcConfig     *config,
 388                FcFontSet    **sets,
 389                int          nsets,
 390                FcPattern    *p,
 391                FcObjectSet  *os)
 392 {
 393     FcFontSet       *ret;
 394     FcFontSet       *s;
 395     int             f;
 396     int             set;
 397     FcListHashTable table;
 398     int             i;
 399     FcListBucket    *bucket;
 400
 401     if (!config)
 402     {
 403         if (!FcInitBringUptoDate ())
 404             goto bail0;
 405
 406         config = FcConfigGetCurrent ();
 407         if (!config)
 408             goto bail0;
 409     }
 410     FcListHashTableInit (&table);
 411     /*
 412      * Walk all available fonts adding those that
 413      * match to the hash table
 414      */
 415     for (set = 0; set < nsets; set++)
 416     {
 417         s = sets[set];
 418         if (!s)
 419             continue;
 420         for (f = 0; f < s->nfont; f++)
 421             if (FcListPatternMatchAny (p,               /* pattern */
 422                                        s->fonts[f]))    /* font */
 423                 if (!FcListAppend (&table, s->fonts[f], os))
 424                     goto bail1;
 425     }
 426 #if 0
 427     {
 428         int     max = 0;
 429         int     full = 0;
 430         int     ents = 0;
 431         int     len;
 432         for (i = 0; i < FC_LIST_HASH_SIZE; i++)
 433         {
 434             if ((bucket = table.buckets[i]))
 435             {
 436                 len = 0;
 437                 for (; bucket; bucket = bucket->next)
 438                 {
 439                     ents++;
 440                     len++;
 441                 }
 442                 if (len > max)
 443                     max = len;
 444                 full++;
 445             }
 446         }
 447         printf ("used: %d max: %d avg: %g\n", full, max,
 448                 (double) ents / FC_LIST_HASH_SIZE);
 449     }
 450 #endif
 451     /*
 452      * Walk the hash table and build
 453      * a font set
 454      */
 455     ret = FcFontSetCreate ();
 456     if (!ret)
 457         goto bail0;
 458     for (i = 0; i < FC_LIST_HASH_SIZE; i++)
 459         while ((bucket = table.buckets[i]))
 460         {
 461             if (!FcFontSetAdd (ret, bucket->pattern))
 462                 goto bail2;
 463             table.buckets[i] = bucket->next;
 464             FcMemFree (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 465             free (bucket);
 466         }
 467
 468     return ret;
 469
 470 bail2:
 471     FcFontSetDestroy (ret);
 472 bail1:
 473     FcListHashTableCleanup (&table);
 474 bail0:
 475     return 0;
 476 }
 477
 478 FcFontSet *
 479 FcFontList (FcConfig    *config,
 480             FcPattern   *p,
 481             FcObjectSet *os)
 482 {
 483     FcFontSet   *sets[2];
 484     int         nsets;
 485
 486     if (!config)
 487     {
 488         config = FcConfigGetCurrent ();
 489         if (!config)
 490             return 0;
 491     }
 492     nsets = 0;
 493     if (config->fonts[FcSetSystem])
 494         sets[nsets++] = config->fonts[FcSetSystem];
 495     if (config->fonts[FcSetApplication])
 496         sets[nsets++] = config->fonts[FcSetApplication];
 497     return FcFontSetList (config, sets, nsets, p, os);
 498 }