src/fclist.c

   1 /*
   2  * $XFree86: xc/lib/fontconfig/src/fclist.c,v 1.4 2002/06/02 21:07:56 keithp Exp $
   3  *
   4  * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
   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] = 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 static FcBool
 124 FcListValueListMatchAny (FcValueList *v1orig,
 125                          FcValueList *v2orig)
 126 {
 127     FcValueList     *v1, *v2;
 128
 129     for (v1 = v1orig; v1; v1 = v1->next)
 130         for (v2 = v2orig; v2; v2 = v2->next)
 131             if (FcConfigCompareValue (v2->value, FcOpContains, v1->value))
 132                 return FcTrue;
 133     return FcFalse;
 134 }
 135
 136 static FcBool
 137 FcListValueListEqual (FcValueList   *v1orig,
 138                       FcValueList   *v2orig)
 139 {
 140     FcValueList     *v1, *v2;
 141
 142     for (v1 = v1orig; v1; v1 = v1->next)
 143     {
 144         for (v2 = v2orig; v2; v2 = v2->next)
 145             if (FcConfigCompareValue (v1->value, FcOpEqual, v2->value))
 146                 break;
 147         if (!v2)
 148             return FcFalse;
 149     }
 150     for (v2 = v2orig; v2; v2 = v2->next)
 151     {
 152         for (v1 = v1orig; v1; v1 = v1->next)
 153             if (FcConfigCompareValue (v1->value, FcOpEqual, v2->value))
 154                 break;
 155         if (!v1)
 156             return FcFalse;
 157     }
 158     return FcTrue;
 159 }
 160
 161 static FcBool
 162 FcListPatternEqual (FcPattern   *p1,
 163                     FcPattern   *p2,
 164                     FcObjectSet *os)
 165 {
 166     int             i;
 167     FcPatternElt    *e1, *e2;
 168
 169     for (i = 0; i < os->nobject; i++)
 170     {
 171         e1 = FcPatternFindElt (p1, os->objects[i]);
 172         e2 = FcPatternFindElt (p2, os->objects[i]);
 173         if (!e1 && !e2)
 174             return FcTrue;
 175         if (!e1 || !e2)
 176             return FcFalse;
 177         if (!FcListValueListEqual (e1->values, e2->values))
 178             return FcFalse;
 179     }
 180     return FcTrue;
 181 }
 182
 183 /*
 184  * FcTrue iff all objects in "p" match "font"
 185  */
 186
 187 static FcBool
 188 FcListPatternMatchAny (FcPattern *p,
 189                        FcPattern *font)
 190 {
 191     int             i;
 192     FcPatternElt   *e;
 193
 194     for (i = 0; i < p->num; i++)
 195     {
 196         e = FcPatternFindElt (font, p->elts[i].object);
 197         if (!e)
 198             return FcFalse;
 199         if (!FcListValueListMatchAny (p->elts[i].values, e->values))
 200             return FcFalse;
 201     }
 202     return FcTrue;
 203 }
 204
 205 static FcChar32
 206 FcListStringHash (const FcChar8 *s)
 207 {
 208     FcChar32    h = 0;
 209     FcChar8     c;
 210
 211     while ((c = *s++))
 212     {
 213         c = FcToLower (c);
 214         h = ((h << 3) ^ (h >> 3)) ^ c;
 215     }
 216     return h;
 217 }
 218
 219 static FcChar32
 220 FcListMatrixHash (const FcMatrix *m)
 221 {
 222     int     xx = (int) (m->xx * 100),
 223             xy = (int) (m->xy * 100),
 224             yx = (int) (m->yx * 100),
 225             yy = (int) (m->yy * 100);
 226
 227     return ((FcChar32) xx) ^ ((FcChar32) xy) ^ ((FcChar32) yx) ^ ((FcChar32) yy);
 228 }
 229
 230 static FcChar32
 231 FcListValueHash (FcValue    v)
 232 {
 233     switch (v.type) {
 234     case FcTypeVoid:
 235         return 0;
 236     case FcTypeInteger:
 237         return (FcChar32) v.u.i;
 238     case FcTypeDouble:
 239         return (FcChar32) (int) v.u.d;
 240     case FcTypeString:
 241         return FcListStringHash (v.u.s);
 242     case FcTypeBool:
 243         return (FcChar32) v.u.b;
 244     case FcTypeMatrix:
 245         return FcListMatrixHash (v.u.m);
 246     case FcTypeCharSet:
 247         return FcCharSetCount (v.u.c);
 248     case FcTypeFTFace:
 249         return (FcChar32) v.u.f;
 250     }
 251     return 0;
 252 }
 253
 254 static FcChar32
 255 FcListValueListHash (FcValueList    *list)
 256 {
 257     FcChar32    h = 0;
 258
 259     while (list)
 260     {
 261         h = h ^ FcListValueHash (list->value);
 262         list = list->next;
 263     }
 264     return h;
 265 }
 266
 267 static FcChar32
 268 FcListPatternHash (FcPattern    *font,
 269                    FcObjectSet  *os)
 270 {
 271     int             n;
 272     FcPatternElt    *e;
 273     FcChar32        h = 0;
 274
 275     for (n = 0; n < os->nobject; n++)
 276     {
 277         e = FcPatternFindElt (font, os->objects[n]);
 278         if (e)
 279             h = h ^ FcListValueListHash (e->values);
 280     }
 281     return h;
 282 }
 283
 284 typedef struct _FcListBucket {
 285     struct _FcListBucket    *next;
 286     FcChar32                hash;
 287     FcPattern               *pattern;
 288 } FcListBucket;
 289
 290 #define FC_LIST_HASH_SIZE   4099
 291
 292 typedef struct _FcListHashTable {
 293     int             entries;
 294     FcListBucket    *buckets[FC_LIST_HASH_SIZE];
 295 } FcListHashTable;
 296
 297 static void
 298 FcListHashTableInit (FcListHashTable *table)
 299 {
 300     table->entries = 0;
 301     memset (table->buckets, '\0', sizeof (table->buckets));
 302 }
 303
 304 static void
 305 FcListHashTableCleanup (FcListHashTable *table)
 306 {
 307     int i;
 308     FcListBucket    *bucket, *next;
 309
 310     for (i = 0; i < FC_LIST_HASH_SIZE; i++)
 311     {
 312         for (bucket = table->buckets[i]; bucket; bucket = next)
 313         {
 314             next = bucket->next;
 315             FcPatternDestroy (bucket->pattern);
 316             FcMemFree (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 317             free (bucket);
 318         }
 319         table->buckets[i] = 0;
 320     }
 321     table->entries = 0;
 322 }
 323
 324 static FcBool
 325 FcListAppend (FcListHashTable   *table,
 326               FcPattern         *font,
 327               FcObjectSet       *os)
 328 {
 329     int             o;
 330     FcPatternElt    *e;
 331     FcValueList     *v;
 332     FcChar32        hash;
 333     FcListBucket    **prev, *bucket;
 334
 335     hash = FcListPatternHash (font, os);
 336     for (prev = &table->buckets[hash % FC_LIST_HASH_SIZE];
 337          (bucket = *prev); prev = &(bucket->next))
 338     {
 339         if (bucket->hash == hash &&
 340             FcListPatternEqual (bucket->pattern, font, os))
 341             return FcTrue;
 342     }
 343     bucket = (FcListBucket *) malloc (sizeof (FcListBucket));
 344     if (!bucket)
 345         goto bail0;
 346     FcMemAlloc (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 347     bucket->next = 0;
 348     bucket->hash = hash;
 349     bucket->pattern = FcPatternCreate ();
 350     if (!bucket->pattern)
 351         goto bail1;
 352
 353     for (o = 0; o < os->nobject; o++)
 354     {
 355         e = FcPatternFindElt (font, os->objects[o]);
 356         if (e)
 357         {
 358             for (v = e->values; v; v = v->next)
 359             {
 360                 if (!FcPatternAdd (bucket->pattern,
 361                                    os->objects[o],
 362                                    v->value, FcTrue))
 363                     goto bail2;
 364             }
 365         }
 366     }
 367     *prev = bucket;
 368     ++table->entries;
 369
 370     return FcTrue;
 371
 372 bail2:
 373     FcPatternDestroy (bucket->pattern);
 374 bail1:
 375     FcMemFree (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 376     free (bucket);
 377 bail0:
 378     return FcFalse;
 379 }
 380
 381 FcFontSet *
 382 FcFontSetList (FcConfig     *config,
 383                FcFontSet    **sets,
 384                int          nsets,
 385                FcPattern    *p,
 386                FcObjectSet  *os)
 387 {
 388     FcFontSet       *ret;
 389     FcFontSet       *s;
 390     int             f;
 391     int             set;
 392     FcListHashTable table;
 393     int             i;
 394     FcListBucket    *bucket;
 395
 396     if (!config)
 397     {
 398         if (!FcInitBringUptoDate ())
 399             goto bail0;
 400
 401         config = FcConfigGetCurrent ();
 402         if (!config)
 403             goto bail0;
 404     }
 405     FcListHashTableInit (&table);
 406     /*
 407      * Walk all available fonts adding those that
 408      * match to the hash table
 409      */
 410     for (set = 0; set < nsets; set++)
 411     {
 412         s = sets[set];
 413         if (!s)
 414             continue;
 415         for (f = 0; f < s->nfont; f++)
 416             if (FcListPatternMatchAny (p, s->fonts[f]))
 417                 if (!FcListAppend (&table, s->fonts[f], os))
 418                     goto bail1;
 419     }
 420 #if 0
 421     {
 422         int     max = 0;
 423         int     full = 0;
 424         int     ents = 0;
 425         int     len;
 426         for (i = 0; i < FC_LIST_HASH_SIZE; i++)
 427         {
 428             if ((bucket = table.buckets[i]))
 429             {
 430                 len = 0;
 431                 for (; bucket; bucket = bucket->next)
 432                 {
 433                     ents++;
 434                     len++;
 435                 }
 436                 if (len > max)
 437                     max = len;
 438                 full++;
 439             }
 440         }
 441         printf ("used: %d max: %d avg: %g\n", full, max,
 442                 (double) ents / FC_LIST_HASH_SIZE);
 443     }
 444 #endif
 445     /*
 446      * Walk the hash table and build
 447      * a font set
 448      */
 449     ret = FcFontSetCreate ();
 450     if (!ret)
 451         goto bail0;
 452     for (i = 0; i < FC_LIST_HASH_SIZE; i++)
 453         while ((bucket = table.buckets[i]))
 454         {
 455             if (!FcFontSetAdd (ret, bucket->pattern))
 456                 goto bail2;
 457             table.buckets[i] = bucket->next;
 458             FcMemFree (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 459             free (bucket);
 460         }
 461
 462     return ret;
 463
 464 bail2:
 465     FcFontSetDestroy (ret);
 466 bail1:
 467     FcListHashTableCleanup (&table);
 468 bail0:
 469     return 0;
 470 }
 471
 472 FcFontSet *
 473 FcFontList (FcConfig    *config,
 474             FcPattern   *p,
 475             FcObjectSet *os)
 476 {
 477     FcFontSet   *sets[2];
 478     int         nsets;
 479
 480     if (!config)
 481     {
 482         config = FcConfigGetCurrent ();
 483         if (!config)
 484             return 0;
 485     }
 486     nsets = 0;
 487     if (config->fonts[FcSetSystem])
 488         sets[nsets++] = config->fonts[FcSetSystem];
 489     if (config->fonts[FcSetApplication])
 490         sets[nsets++] = config->fonts[FcSetApplication];
 491     return FcFontSetList (config, sets, nsets, p, os);
 492 }